diff --git a/.gitmodules b/.gitmodules
index 97b7197be323212a29615efbf14dc1e416fab6f9..557321001f74e795a5871c4dd45cfc4906f45fa5 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -11,4 +11,4 @@
 	branch = v3.0.0-alpha-1
 [submodule "third_party/gflags"]
 	path = third_party/gflags
-	url = https://code.google.com/p/gflags
+	url = https://github.com/gflags/gflags.git
diff --git a/BUILD b/BUILD
index 43017102a106348bc53c657b6fd4dc102f7eb18f..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 100644
--- a/BUILD
+++ b/BUILD
@@ -1,567 +0,0 @@
-# GRPC Bazel BUILD file.
-# This currently builds C and C++ code.
-
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-licenses(["notice"])  # 3-clause BSD
-
-
-
-cc_library(
-    name = "gpr",
-    srcs = [
-        "src/core/support/env.h",
-        "src/core/support/file.h",
-        "src/core/support/murmur_hash.h",
-        "src/core/support/string.h",
-        "src/core/support/string_win32.h",
-        "src/core/support/thd_internal.h",
-        "src/core/support/alloc.c",
-        "src/core/support/cancellable.c",
-        "src/core/support/cmdline.c",
-        "src/core/support/cpu_iphone.c",
-        "src/core/support/cpu_linux.c",
-        "src/core/support/cpu_posix.c",
-        "src/core/support/cpu_windows.c",
-        "src/core/support/env_linux.c",
-        "src/core/support/env_posix.c",
-        "src/core/support/env_win32.c",
-        "src/core/support/file.c",
-        "src/core/support/file_posix.c",
-        "src/core/support/file_win32.c",
-        "src/core/support/histogram.c",
-        "src/core/support/host_port.c",
-        "src/core/support/log.c",
-        "src/core/support/log_android.c",
-        "src/core/support/log_linux.c",
-        "src/core/support/log_posix.c",
-        "src/core/support/log_win32.c",
-        "src/core/support/murmur_hash.c",
-        "src/core/support/slice.c",
-        "src/core/support/slice_buffer.c",
-        "src/core/support/string.c",
-        "src/core/support/string_posix.c",
-        "src/core/support/string_win32.c",
-        "src/core/support/sync.c",
-        "src/core/support/sync_posix.c",
-        "src/core/support/sync_win32.c",
-        "src/core/support/thd_posix.c",
-        "src/core/support/thd_win32.c",
-        "src/core/support/time.c",
-        "src/core/support/time_posix.c",
-        "src/core/support/time_win32.c",
-    ],
-    hdrs = [
-        "include/grpc/support/alloc.h",
-        "include/grpc/support/atm.h",
-        "include/grpc/support/atm_gcc_atomic.h",
-        "include/grpc/support/atm_gcc_sync.h",
-        "include/grpc/support/atm_win32.h",
-        "include/grpc/support/cancellable_platform.h",
-        "include/grpc/support/cmdline.h",
-        "include/grpc/support/cpu.h",
-        "include/grpc/support/histogram.h",
-        "include/grpc/support/host_port.h",
-        "include/grpc/support/log.h",
-        "include/grpc/support/log_win32.h",
-        "include/grpc/support/port_platform.h",
-        "include/grpc/support/slice.h",
-        "include/grpc/support/slice_buffer.h",
-        "include/grpc/support/sync.h",
-        "include/grpc/support/sync_generic.h",
-        "include/grpc/support/sync_posix.h",
-        "include/grpc/support/sync_win32.h",
-        "include/grpc/support/thd.h",
-        "include/grpc/support/time.h",
-        "include/grpc/support/useful.h",
-    ],
-    includes = [
-        "include",
-        ".",
-    ],
-    deps = [
-    ],
-)
-
-
-
-
-cc_library(
-    name = "grpc",
-    srcs = [
-        "src/core/httpcli/format_request.h",
-        "src/core/httpcli/httpcli.h",
-        "src/core/httpcli/httpcli_security_context.h",
-        "src/core/httpcli/parser.h",
-        "src/core/security/auth.h",
-        "src/core/security/base64.h",
-        "src/core/security/credentials.h",
-        "src/core/security/json_token.h",
-        "src/core/security/secure_endpoint.h",
-        "src/core/security/secure_transport_setup.h",
-        "src/core/security/security_context.h",
-        "src/core/tsi/fake_transport_security.h",
-        "src/core/tsi/ssl_transport_security.h",
-        "src/core/tsi/transport_security.h",
-        "src/core/tsi/transport_security_interface.h",
-        "src/core/channel/census_filter.h",
-        "src/core/channel/channel_args.h",
-        "src/core/channel/channel_stack.h",
-        "src/core/channel/child_channel.h",
-        "src/core/channel/client_channel.h",
-        "src/core/channel/client_setup.h",
-        "src/core/channel/connected_channel.h",
-        "src/core/channel/http_client_filter.h",
-        "src/core/channel/http_filter.h",
-        "src/core/channel/http_server_filter.h",
-        "src/core/channel/metadata_buffer.h",
-        "src/core/channel/noop_filter.h",
-        "src/core/compression/algorithm.h",
-        "src/core/compression/message_compress.h",
-        "src/core/debug/trace.h",
-        "src/core/iomgr/alarm.h",
-        "src/core/iomgr/alarm_heap.h",
-        "src/core/iomgr/alarm_internal.h",
-        "src/core/iomgr/endpoint.h",
-        "src/core/iomgr/endpoint_pair.h",
-        "src/core/iomgr/fd_posix.h",
-        "src/core/iomgr/iocp_windows.h",
-        "src/core/iomgr/iomgr.h",
-        "src/core/iomgr/iomgr_internal.h",
-        "src/core/iomgr/iomgr_posix.h",
-        "src/core/iomgr/pollset.h",
-        "src/core/iomgr/pollset_kick.h",
-        "src/core/iomgr/pollset_kick_posix.h",
-        "src/core/iomgr/pollset_kick_windows.h",
-        "src/core/iomgr/pollset_posix.h",
-        "src/core/iomgr/pollset_windows.h",
-        "src/core/iomgr/resolve_address.h",
-        "src/core/iomgr/sockaddr.h",
-        "src/core/iomgr/sockaddr_posix.h",
-        "src/core/iomgr/sockaddr_utils.h",
-        "src/core/iomgr/sockaddr_win32.h",
-        "src/core/iomgr/socket_utils_posix.h",
-        "src/core/iomgr/socket_windows.h",
-        "src/core/iomgr/tcp_client.h",
-        "src/core/iomgr/tcp_posix.h",
-        "src/core/iomgr/tcp_server.h",
-        "src/core/iomgr/tcp_windows.h",
-        "src/core/iomgr/time_averaged_stats.h",
-        "src/core/iomgr/wakeup_fd_pipe.h",
-        "src/core/iomgr/wakeup_fd_posix.h",
-        "src/core/json/json.h",
-        "src/core/json/json_common.h",
-        "src/core/json/json_reader.h",
-        "src/core/json/json_writer.h",
-        "src/core/statistics/census_interface.h",
-        "src/core/statistics/census_log.h",
-        "src/core/statistics/census_rpc_stats.h",
-        "src/core/statistics/census_tracing.h",
-        "src/core/statistics/hash_table.h",
-        "src/core/statistics/window_stats.h",
-        "src/core/surface/byte_buffer_queue.h",
-        "src/core/surface/call.h",
-        "src/core/surface/channel.h",
-        "src/core/surface/client.h",
-        "src/core/surface/completion_queue.h",
-        "src/core/surface/event_string.h",
-        "src/core/surface/init.h",
-        "src/core/surface/server.h",
-        "src/core/surface/surface_trace.h",
-        "src/core/transport/chttp2/alpn.h",
-        "src/core/transport/chttp2/bin_encoder.h",
-        "src/core/transport/chttp2/frame.h",
-        "src/core/transport/chttp2/frame_data.h",
-        "src/core/transport/chttp2/frame_goaway.h",
-        "src/core/transport/chttp2/frame_ping.h",
-        "src/core/transport/chttp2/frame_rst_stream.h",
-        "src/core/transport/chttp2/frame_settings.h",
-        "src/core/transport/chttp2/frame_window_update.h",
-        "src/core/transport/chttp2/hpack_parser.h",
-        "src/core/transport/chttp2/hpack_table.h",
-        "src/core/transport/chttp2/http2_errors.h",
-        "src/core/transport/chttp2/huffsyms.h",
-        "src/core/transport/chttp2/status_conversion.h",
-        "src/core/transport/chttp2/stream_encoder.h",
-        "src/core/transport/chttp2/stream_map.h",
-        "src/core/transport/chttp2/timeout_encoding.h",
-        "src/core/transport/chttp2/varint.h",
-        "src/core/transport/chttp2_transport.h",
-        "src/core/transport/metadata.h",
-        "src/core/transport/stream_op.h",
-        "src/core/transport/transport.h",
-        "src/core/transport/transport_impl.h",
-        "src/core/httpcli/format_request.c",
-        "src/core/httpcli/httpcli.c",
-        "src/core/httpcli/httpcli_security_context.c",
-        "src/core/httpcli/parser.c",
-        "src/core/security/auth.c",
-        "src/core/security/base64.c",
-        "src/core/security/credentials.c",
-        "src/core/security/credentials_posix.c",
-        "src/core/security/credentials_win32.c",
-        "src/core/security/factories.c",
-        "src/core/security/google_default_credentials.c",
-        "src/core/security/json_token.c",
-        "src/core/security/secure_endpoint.c",
-        "src/core/security/secure_transport_setup.c",
-        "src/core/security/security_context.c",
-        "src/core/security/server_secure_chttp2.c",
-        "src/core/surface/init_secure.c",
-        "src/core/surface/secure_channel_create.c",
-        "src/core/tsi/fake_transport_security.c",
-        "src/core/tsi/ssl_transport_security.c",
-        "src/core/tsi/transport_security.c",
-        "src/core/channel/call_op_string.c",
-        "src/core/channel/census_filter.c",
-        "src/core/channel/channel_args.c",
-        "src/core/channel/channel_stack.c",
-        "src/core/channel/child_channel.c",
-        "src/core/channel/client_channel.c",
-        "src/core/channel/client_setup.c",
-        "src/core/channel/connected_channel.c",
-        "src/core/channel/http_client_filter.c",
-        "src/core/channel/http_filter.c",
-        "src/core/channel/http_server_filter.c",
-        "src/core/channel/metadata_buffer.c",
-        "src/core/channel/noop_filter.c",
-        "src/core/compression/algorithm.c",
-        "src/core/compression/message_compress.c",
-        "src/core/debug/trace.c",
-        "src/core/iomgr/alarm.c",
-        "src/core/iomgr/alarm_heap.c",
-        "src/core/iomgr/endpoint.c",
-        "src/core/iomgr/endpoint_pair_posix.c",
-        "src/core/iomgr/endpoint_pair_windows.c",
-        "src/core/iomgr/fd_posix.c",
-        "src/core/iomgr/iocp_windows.c",
-        "src/core/iomgr/iomgr.c",
-        "src/core/iomgr/iomgr_posix.c",
-        "src/core/iomgr/iomgr_windows.c",
-        "src/core/iomgr/pollset_kick.c",
-        "src/core/iomgr/pollset_multipoller_with_epoll.c",
-        "src/core/iomgr/pollset_multipoller_with_poll_posix.c",
-        "src/core/iomgr/pollset_posix.c",
-        "src/core/iomgr/pollset_windows.c",
-        "src/core/iomgr/resolve_address_posix.c",
-        "src/core/iomgr/resolve_address_windows.c",
-        "src/core/iomgr/sockaddr_utils.c",
-        "src/core/iomgr/socket_utils_common_posix.c",
-        "src/core/iomgr/socket_utils_linux.c",
-        "src/core/iomgr/socket_utils_posix.c",
-        "src/core/iomgr/socket_windows.c",
-        "src/core/iomgr/tcp_client_posix.c",
-        "src/core/iomgr/tcp_client_windows.c",
-        "src/core/iomgr/tcp_posix.c",
-        "src/core/iomgr/tcp_server_posix.c",
-        "src/core/iomgr/tcp_server_windows.c",
-        "src/core/iomgr/tcp_windows.c",
-        "src/core/iomgr/time_averaged_stats.c",
-        "src/core/iomgr/wakeup_fd_eventfd.c",
-        "src/core/iomgr/wakeup_fd_nospecial.c",
-        "src/core/iomgr/wakeup_fd_pipe.c",
-        "src/core/iomgr/wakeup_fd_posix.c",
-        "src/core/json/json.c",
-        "src/core/json/json_reader.c",
-        "src/core/json/json_string.c",
-        "src/core/json/json_writer.c",
-        "src/core/statistics/census_init.c",
-        "src/core/statistics/census_log.c",
-        "src/core/statistics/census_rpc_stats.c",
-        "src/core/statistics/census_tracing.c",
-        "src/core/statistics/hash_table.c",
-        "src/core/statistics/window_stats.c",
-        "src/core/surface/byte_buffer.c",
-        "src/core/surface/byte_buffer_queue.c",
-        "src/core/surface/byte_buffer_reader.c",
-        "src/core/surface/call.c",
-        "src/core/surface/call_details.c",
-        "src/core/surface/call_log_batch.c",
-        "src/core/surface/channel.c",
-        "src/core/surface/channel_create.c",
-        "src/core/surface/client.c",
-        "src/core/surface/completion_queue.c",
-        "src/core/surface/event_string.c",
-        "src/core/surface/init.c",
-        "src/core/surface/lame_client.c",
-        "src/core/surface/metadata_array.c",
-        "src/core/surface/server.c",
-        "src/core/surface/server_chttp2.c",
-        "src/core/surface/server_create.c",
-        "src/core/surface/surface_trace.c",
-        "src/core/transport/chttp2/alpn.c",
-        "src/core/transport/chttp2/bin_encoder.c",
-        "src/core/transport/chttp2/frame_data.c",
-        "src/core/transport/chttp2/frame_goaway.c",
-        "src/core/transport/chttp2/frame_ping.c",
-        "src/core/transport/chttp2/frame_rst_stream.c",
-        "src/core/transport/chttp2/frame_settings.c",
-        "src/core/transport/chttp2/frame_window_update.c",
-        "src/core/transport/chttp2/hpack_parser.c",
-        "src/core/transport/chttp2/hpack_table.c",
-        "src/core/transport/chttp2/huffsyms.c",
-        "src/core/transport/chttp2/status_conversion.c",
-        "src/core/transport/chttp2/stream_encoder.c",
-        "src/core/transport/chttp2/stream_map.c",
-        "src/core/transport/chttp2/timeout_encoding.c",
-        "src/core/transport/chttp2/varint.c",
-        "src/core/transport/chttp2_transport.c",
-        "src/core/transport/metadata.c",
-        "src/core/transport/stream_op.c",
-        "src/core/transport/transport.c",
-    ],
-    hdrs = [
-        "include/grpc/grpc_security.h",
-        "include/grpc/byte_buffer.h",
-        "include/grpc/byte_buffer_reader.h",
-        "include/grpc/grpc.h",
-        "include/grpc/grpc_http.h",
-        "include/grpc/status.h",
-    ],
-    includes = [
-        "include",
-        ".",
-    ],
-    deps = [
-        ":gpr",
-    ],
-)
-
-
-
-
-cc_library(
-    name = "grpc_unsecure",
-    srcs = [
-        "src/core/channel/census_filter.h",
-        "src/core/channel/channel_args.h",
-        "src/core/channel/channel_stack.h",
-        "src/core/channel/child_channel.h",
-        "src/core/channel/client_channel.h",
-        "src/core/channel/client_setup.h",
-        "src/core/channel/connected_channel.h",
-        "src/core/channel/http_client_filter.h",
-        "src/core/channel/http_filter.h",
-        "src/core/channel/http_server_filter.h",
-        "src/core/channel/metadata_buffer.h",
-        "src/core/channel/noop_filter.h",
-        "src/core/compression/algorithm.h",
-        "src/core/compression/message_compress.h",
-        "src/core/debug/trace.h",
-        "src/core/iomgr/alarm.h",
-        "src/core/iomgr/alarm_heap.h",
-        "src/core/iomgr/alarm_internal.h",
-        "src/core/iomgr/endpoint.h",
-        "src/core/iomgr/endpoint_pair.h",
-        "src/core/iomgr/fd_posix.h",
-        "src/core/iomgr/iocp_windows.h",
-        "src/core/iomgr/iomgr.h",
-        "src/core/iomgr/iomgr_internal.h",
-        "src/core/iomgr/iomgr_posix.h",
-        "src/core/iomgr/pollset.h",
-        "src/core/iomgr/pollset_kick.h",
-        "src/core/iomgr/pollset_kick_posix.h",
-        "src/core/iomgr/pollset_kick_windows.h",
-        "src/core/iomgr/pollset_posix.h",
-        "src/core/iomgr/pollset_windows.h",
-        "src/core/iomgr/resolve_address.h",
-        "src/core/iomgr/sockaddr.h",
-        "src/core/iomgr/sockaddr_posix.h",
-        "src/core/iomgr/sockaddr_utils.h",
-        "src/core/iomgr/sockaddr_win32.h",
-        "src/core/iomgr/socket_utils_posix.h",
-        "src/core/iomgr/socket_windows.h",
-        "src/core/iomgr/tcp_client.h",
-        "src/core/iomgr/tcp_posix.h",
-        "src/core/iomgr/tcp_server.h",
-        "src/core/iomgr/tcp_windows.h",
-        "src/core/iomgr/time_averaged_stats.h",
-        "src/core/iomgr/wakeup_fd_pipe.h",
-        "src/core/iomgr/wakeup_fd_posix.h",
-        "src/core/json/json.h",
-        "src/core/json/json_common.h",
-        "src/core/json/json_reader.h",
-        "src/core/json/json_writer.h",
-        "src/core/statistics/census_interface.h",
-        "src/core/statistics/census_log.h",
-        "src/core/statistics/census_rpc_stats.h",
-        "src/core/statistics/census_tracing.h",
-        "src/core/statistics/hash_table.h",
-        "src/core/statistics/window_stats.h",
-        "src/core/surface/byte_buffer_queue.h",
-        "src/core/surface/call.h",
-        "src/core/surface/channel.h",
-        "src/core/surface/client.h",
-        "src/core/surface/completion_queue.h",
-        "src/core/surface/event_string.h",
-        "src/core/surface/init.h",
-        "src/core/surface/server.h",
-        "src/core/surface/surface_trace.h",
-        "src/core/transport/chttp2/alpn.h",
-        "src/core/transport/chttp2/bin_encoder.h",
-        "src/core/transport/chttp2/frame.h",
-        "src/core/transport/chttp2/frame_data.h",
-        "src/core/transport/chttp2/frame_goaway.h",
-        "src/core/transport/chttp2/frame_ping.h",
-        "src/core/transport/chttp2/frame_rst_stream.h",
-        "src/core/transport/chttp2/frame_settings.h",
-        "src/core/transport/chttp2/frame_window_update.h",
-        "src/core/transport/chttp2/hpack_parser.h",
-        "src/core/transport/chttp2/hpack_table.h",
-        "src/core/transport/chttp2/http2_errors.h",
-        "src/core/transport/chttp2/huffsyms.h",
-        "src/core/transport/chttp2/status_conversion.h",
-        "src/core/transport/chttp2/stream_encoder.h",
-        "src/core/transport/chttp2/stream_map.h",
-        "src/core/transport/chttp2/timeout_encoding.h",
-        "src/core/transport/chttp2/varint.h",
-        "src/core/transport/chttp2_transport.h",
-        "src/core/transport/metadata.h",
-        "src/core/transport/stream_op.h",
-        "src/core/transport/transport.h",
-        "src/core/transport/transport_impl.h",
-        "src/core/surface/init_unsecure.c",
-        "src/core/channel/call_op_string.c",
-        "src/core/channel/census_filter.c",
-        "src/core/channel/channel_args.c",
-        "src/core/channel/channel_stack.c",
-        "src/core/channel/child_channel.c",
-        "src/core/channel/client_channel.c",
-        "src/core/channel/client_setup.c",
-        "src/core/channel/connected_channel.c",
-        "src/core/channel/http_client_filter.c",
-        "src/core/channel/http_filter.c",
-        "src/core/channel/http_server_filter.c",
-        "src/core/channel/metadata_buffer.c",
-        "src/core/channel/noop_filter.c",
-        "src/core/compression/algorithm.c",
-        "src/core/compression/message_compress.c",
-        "src/core/debug/trace.c",
-        "src/core/iomgr/alarm.c",
-        "src/core/iomgr/alarm_heap.c",
-        "src/core/iomgr/endpoint.c",
-        "src/core/iomgr/endpoint_pair_posix.c",
-        "src/core/iomgr/endpoint_pair_windows.c",
-        "src/core/iomgr/fd_posix.c",
-        "src/core/iomgr/iocp_windows.c",
-        "src/core/iomgr/iomgr.c",
-        "src/core/iomgr/iomgr_posix.c",
-        "src/core/iomgr/iomgr_windows.c",
-        "src/core/iomgr/pollset_kick.c",
-        "src/core/iomgr/pollset_multipoller_with_epoll.c",
-        "src/core/iomgr/pollset_multipoller_with_poll_posix.c",
-        "src/core/iomgr/pollset_posix.c",
-        "src/core/iomgr/pollset_windows.c",
-        "src/core/iomgr/resolve_address_posix.c",
-        "src/core/iomgr/resolve_address_windows.c",
-        "src/core/iomgr/sockaddr_utils.c",
-        "src/core/iomgr/socket_utils_common_posix.c",
-        "src/core/iomgr/socket_utils_linux.c",
-        "src/core/iomgr/socket_utils_posix.c",
-        "src/core/iomgr/socket_windows.c",
-        "src/core/iomgr/tcp_client_posix.c",
-        "src/core/iomgr/tcp_client_windows.c",
-        "src/core/iomgr/tcp_posix.c",
-        "src/core/iomgr/tcp_server_posix.c",
-        "src/core/iomgr/tcp_server_windows.c",
-        "src/core/iomgr/tcp_windows.c",
-        "src/core/iomgr/time_averaged_stats.c",
-        "src/core/iomgr/wakeup_fd_eventfd.c",
-        "src/core/iomgr/wakeup_fd_nospecial.c",
-        "src/core/iomgr/wakeup_fd_pipe.c",
-        "src/core/iomgr/wakeup_fd_posix.c",
-        "src/core/json/json.c",
-        "src/core/json/json_reader.c",
-        "src/core/json/json_string.c",
-        "src/core/json/json_writer.c",
-        "src/core/statistics/census_init.c",
-        "src/core/statistics/census_log.c",
-        "src/core/statistics/census_rpc_stats.c",
-        "src/core/statistics/census_tracing.c",
-        "src/core/statistics/hash_table.c",
-        "src/core/statistics/window_stats.c",
-        "src/core/surface/byte_buffer.c",
-        "src/core/surface/byte_buffer_queue.c",
-        "src/core/surface/byte_buffer_reader.c",
-        "src/core/surface/call.c",
-        "src/core/surface/call_details.c",
-        "src/core/surface/call_log_batch.c",
-        "src/core/surface/channel.c",
-        "src/core/surface/channel_create.c",
-        "src/core/surface/client.c",
-        "src/core/surface/completion_queue.c",
-        "src/core/surface/event_string.c",
-        "src/core/surface/init.c",
-        "src/core/surface/lame_client.c",
-        "src/core/surface/metadata_array.c",
-        "src/core/surface/server.c",
-        "src/core/surface/server_chttp2.c",
-        "src/core/surface/server_create.c",
-        "src/core/surface/surface_trace.c",
-        "src/core/transport/chttp2/alpn.c",
-        "src/core/transport/chttp2/bin_encoder.c",
-        "src/core/transport/chttp2/frame_data.c",
-        "src/core/transport/chttp2/frame_goaway.c",
-        "src/core/transport/chttp2/frame_ping.c",
-        "src/core/transport/chttp2/frame_rst_stream.c",
-        "src/core/transport/chttp2/frame_settings.c",
-        "src/core/transport/chttp2/frame_window_update.c",
-        "src/core/transport/chttp2/hpack_parser.c",
-        "src/core/transport/chttp2/hpack_table.c",
-        "src/core/transport/chttp2/huffsyms.c",
-        "src/core/transport/chttp2/status_conversion.c",
-        "src/core/transport/chttp2/stream_encoder.c",
-        "src/core/transport/chttp2/stream_map.c",
-        "src/core/transport/chttp2/timeout_encoding.c",
-        "src/core/transport/chttp2/varint.c",
-        "src/core/transport/chttp2_transport.c",
-        "src/core/transport/metadata.c",
-        "src/core/transport/stream_op.c",
-        "src/core/transport/transport.c",
-    ],
-    hdrs = [
-        "include/grpc/byte_buffer.h",
-        "include/grpc/byte_buffer_reader.h",
-        "include/grpc/grpc.h",
-        "include/grpc/grpc_http.h",
-        "include/grpc/status.h",
-    ],
-    includes = [
-        "include",
-        ".",
-    ],
-    deps = [
-        ":gpr",
-    ],
-)
-
-
-
-
diff --git a/Makefile b/Makefile
index cbf7c4dd40e2ecbd7dd0a03e46fb7818ea2cf48b..83e4e834b5906f2cc6b5dcfb6e7b1a33cd7f4b30 100644
--- a/Makefile
+++ b/Makefile
@@ -227,7 +227,6 @@ ifeq ($(HAS_CXX11),true)
 CXXFLAGS += -std=c++11
 else
 CXXFLAGS += -std=c++0x
-DEFINES += GRPC_OLD_CXX
 endif
 CPPFLAGS += -g -Wall -Wextra -Werror -Wno-long-long -Wno-unused-parameter
 LDFLAGS += -g
@@ -285,7 +284,7 @@ E = @echo
 Q = @
 endif
 
-VERSION = 0.5.0.0
+VERSION = 0.6.0.0
 
 CPPFLAGS_NO_ARCH += $(addprefix -I, $(INCLUDES)) $(addprefix -D, $(DEFINES))
 CPPFLAGS += $(CPPFLAGS_NO_ARCH) $(ARCH_FLAGS)
@@ -456,7 +455,7 @@ endif
 
 .SECONDARY = %.pb.h %.pb.cc
 
-PROTOC_PLUGINS = $(BINDIR)/$(CONFIG)/grpc_cpp_plugin $(BINDIR)/$(CONFIG)/grpc_python_plugin $(BINDIR)/$(CONFIG)/grpc_ruby_plugin
+PROTOC_PLUGINS = $(BINDIR)/$(CONFIG)/grpc_cpp_plugin $(BINDIR)/$(CONFIG)/grpc_objective_c_plugin $(BINDIR)/$(CONFIG)/grpc_python_plugin $(BINDIR)/$(CONFIG)/grpc_ruby_plugin
 ifeq ($(DEP_MISSING),)
 all: static shared plugins
 dep_error:
@@ -584,6 +583,7 @@ gpr_string_test: $(BINDIR)/$(CONFIG)/gpr_string_test
 gpr_sync_test: $(BINDIR)/$(CONFIG)/gpr_sync_test
 gpr_thd_test: $(BINDIR)/$(CONFIG)/gpr_thd_test
 gpr_time_test: $(BINDIR)/$(CONFIG)/gpr_time_test
+gpr_tls_test: $(BINDIR)/$(CONFIG)/gpr_tls_test
 gpr_useful_test: $(BINDIR)/$(CONFIG)/gpr_useful_test
 grpc_base64_test: $(BINDIR)/$(CONFIG)/grpc_base64_test
 grpc_byte_buffer_reader_test: $(BINDIR)/$(CONFIG)/grpc_byte_buffer_reader_test
@@ -632,6 +632,7 @@ end2end_test: $(BINDIR)/$(CONFIG)/end2end_test
 generic_end2end_test: $(BINDIR)/$(CONFIG)/generic_end2end_test
 grpc_cli: $(BINDIR)/$(CONFIG)/grpc_cli
 grpc_cpp_plugin: $(BINDIR)/$(CONFIG)/grpc_cpp_plugin
+grpc_objective_c_plugin: $(BINDIR)/$(CONFIG)/grpc_objective_c_plugin
 grpc_python_plugin: $(BINDIR)/$(CONFIG)/grpc_python_plugin
 grpc_ruby_plugin: $(BINDIR)/$(CONFIG)/grpc_ruby_plugin
 interop_client: $(BINDIR)/$(CONFIG)/interop_client
@@ -641,6 +642,7 @@ pubsub_client: $(BINDIR)/$(CONFIG)/pubsub_client
 pubsub_publisher_test: $(BINDIR)/$(CONFIG)/pubsub_publisher_test
 pubsub_subscriber_test: $(BINDIR)/$(CONFIG)/pubsub_subscriber_test
 qps_driver: $(BINDIR)/$(CONFIG)/qps_driver
+qps_smoke_test: $(BINDIR)/$(CONFIG)/qps_smoke_test
 qps_worker: $(BINDIR)/$(CONFIG)/qps_worker
 status_test: $(BINDIR)/$(CONFIG)/status_test
 thread_pool_test: $(BINDIR)/$(CONFIG)/thread_pool_test
@@ -1075,13 +1077,13 @@ privatelibs: privatelibs_c privatelibs_cxx
 
 privatelibs_c:  $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libend2end_fixture_chttp2_fake_security.a $(LIBDIR)/$(CONFIG)/libend2end_fixture_chttp2_fullstack.a $(LIBDIR)/$(CONFIG)/libend2end_fixture_chttp2_fullstack_uds.a $(LIBDIR)/$(CONFIG)/libend2end_fixture_chttp2_simple_ssl_fullstack.a $(LIBDIR)/$(CONFIG)/libend2end_fixture_chttp2_simple_ssl_with_oauth2_fullstack.a $(LIBDIR)/$(CONFIG)/libend2end_fixture_chttp2_socket_pair.a $(LIBDIR)/$(CONFIG)/libend2end_fixture_chttp2_socket_pair_one_byte_at_a_time.a $(LIBDIR)/$(CONFIG)/libend2end_test_bad_hostname.a $(LIBDIR)/$(CONFIG)/libend2end_test_cancel_after_accept.a $(LIBDIR)/$(CONFIG)/libend2end_test_cancel_after_accept_and_writes_closed.a $(LIBDIR)/$(CONFIG)/libend2end_test_cancel_after_invoke.a $(LIBDIR)/$(CONFIG)/libend2end_test_cancel_before_invoke.a $(LIBDIR)/$(CONFIG)/libend2end_test_cancel_in_a_vacuum.a $(LIBDIR)/$(CONFIG)/libend2end_test_census_simple_request.a $(LIBDIR)/$(CONFIG)/libend2end_test_disappearing_server.a $(LIBDIR)/$(CONFIG)/libend2end_test_early_server_shutdown_finishes_inflight_calls.a $(LIBDIR)/$(CONFIG)/libend2end_test_early_server_shutdown_finishes_tags.a $(LIBDIR)/$(CONFIG)/libend2end_test_empty_batch.a $(LIBDIR)/$(CONFIG)/libend2end_test_graceful_server_shutdown.a $(LIBDIR)/$(CONFIG)/libend2end_test_invoke_large_request.a $(LIBDIR)/$(CONFIG)/libend2end_test_max_concurrent_streams.a $(LIBDIR)/$(CONFIG)/libend2end_test_no_op.a $(LIBDIR)/$(CONFIG)/libend2end_test_ping_pong_streaming.a $(LIBDIR)/$(CONFIG)/libend2end_test_request_response_with_binary_metadata_and_payload.a $(LIBDIR)/$(CONFIG)/libend2end_test_request_response_with_metadata_and_payload.a $(LIBDIR)/$(CONFIG)/libend2end_test_request_response_with_payload.a $(LIBDIR)/$(CONFIG)/libend2end_test_request_with_large_metadata.a $(LIBDIR)/$(CONFIG)/libend2end_test_request_with_payload.a $(LIBDIR)/$(CONFIG)/libend2end_test_simple_delayed_request.a $(LIBDIR)/$(CONFIG)/libend2end_test_simple_request.a $(LIBDIR)/$(CONFIG)/libend2end_test_thread_stress.a $(LIBDIR)/$(CONFIG)/libend2end_test_writes_done_hangs_with_pending_read.a $(LIBDIR)/$(CONFIG)/libend2end_test_cancel_after_accept_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_cancel_after_accept_and_writes_closed_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_cancel_after_invoke_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_cancel_before_invoke_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_cancel_in_a_vacuum_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_census_simple_request_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_disappearing_server_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_early_server_shutdown_finishes_inflight_calls_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_early_server_shutdown_finishes_tags_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_graceful_server_shutdown_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_invoke_large_request_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_max_concurrent_streams_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_no_op_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_ping_pong_streaming_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_request_response_with_binary_metadata_and_payload_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_request_response_with_metadata_and_payload_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_request_response_with_payload_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_request_response_with_trailing_metadata_and_payload_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_request_with_large_metadata_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_request_with_payload_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_simple_delayed_request_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_simple_request_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_thread_stress_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_test_writes_done_hangs_with_pending_read_legacy.a $(LIBDIR)/$(CONFIG)/libend2end_certs.a
 
-privatelibs_cxx:  $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libpubsub_client_lib.a $(LIBDIR)/$(CONFIG)/libqps.a
+privatelibs_cxx:  $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libinterop_client_lib.a $(LIBDIR)/$(CONFIG)/libinterop_server_lib.a $(LIBDIR)/$(CONFIG)/libpubsub_client_lib.a $(LIBDIR)/$(CONFIG)/libqps.a
 
 buildtests: buildtests_c buildtests_cxx
 
-buildtests_c: privatelibs_c $(BINDIR)/$(CONFIG)/alarm_heap_test $(BINDIR)/$(CONFIG)/alarm_list_test $(BINDIR)/$(CONFIG)/alarm_test $(BINDIR)/$(CONFIG)/alpn_test $(BINDIR)/$(CONFIG)/bin_encoder_test $(BINDIR)/$(CONFIG)/census_hash_table_test $(BINDIR)/$(CONFIG)/census_statistics_multiple_writers_circular_buffer_test $(BINDIR)/$(CONFIG)/census_statistics_multiple_writers_test $(BINDIR)/$(CONFIG)/census_statistics_performance_test $(BINDIR)/$(CONFIG)/census_statistics_quick_test $(BINDIR)/$(CONFIG)/census_statistics_small_log_test $(BINDIR)/$(CONFIG)/census_stub_test $(BINDIR)/$(CONFIG)/census_window_stats_test $(BINDIR)/$(CONFIG)/chttp2_status_conversion_test $(BINDIR)/$(CONFIG)/chttp2_stream_encoder_test $(BINDIR)/$(CONFIG)/chttp2_stream_map_test $(BINDIR)/$(CONFIG)/chttp2_transport_end2end_test $(BINDIR)/$(CONFIG)/dualstack_socket_test $(BINDIR)/$(CONFIG)/echo_client $(BINDIR)/$(CONFIG)/echo_server $(BINDIR)/$(CONFIG)/echo_test $(BINDIR)/$(CONFIG)/fd_posix_test $(BINDIR)/$(CONFIG)/fling_client $(BINDIR)/$(CONFIG)/fling_server $(BINDIR)/$(CONFIG)/fling_stream_test $(BINDIR)/$(CONFIG)/fling_test $(BINDIR)/$(CONFIG)/gpr_cancellable_test $(BINDIR)/$(CONFIG)/gpr_cmdline_test $(BINDIR)/$(CONFIG)/gpr_env_test $(BINDIR)/$(CONFIG)/gpr_file_test $(BINDIR)/$(CONFIG)/gpr_histogram_test $(BINDIR)/$(CONFIG)/gpr_host_port_test $(BINDIR)/$(CONFIG)/gpr_log_test $(BINDIR)/$(CONFIG)/gpr_slice_buffer_test $(BINDIR)/$(CONFIG)/gpr_slice_test $(BINDIR)/$(CONFIG)/gpr_string_test $(BINDIR)/$(CONFIG)/gpr_sync_test $(BINDIR)/$(CONFIG)/gpr_thd_test $(BINDIR)/$(CONFIG)/gpr_time_test $(BINDIR)/$(CONFIG)/gpr_useful_test $(BINDIR)/$(CONFIG)/grpc_base64_test $(BINDIR)/$(CONFIG)/grpc_byte_buffer_reader_test $(BINDIR)/$(CONFIG)/grpc_channel_stack_test $(BINDIR)/$(CONFIG)/grpc_completion_queue_test $(BINDIR)/$(CONFIG)/grpc_credentials_test $(BINDIR)/$(CONFIG)/grpc_json_token_test $(BINDIR)/$(CONFIG)/grpc_stream_op_test $(BINDIR)/$(CONFIG)/hpack_parser_test $(BINDIR)/$(CONFIG)/hpack_table_test $(BINDIR)/$(CONFIG)/httpcli_format_request_test $(BINDIR)/$(CONFIG)/httpcli_parser_test $(BINDIR)/$(CONFIG)/httpcli_test $(BINDIR)/$(CONFIG)/json_rewrite $(BINDIR)/$(CONFIG)/json_rewrite_test $(BINDIR)/$(CONFIG)/json_test $(BINDIR)/$(CONFIG)/lame_client_test $(BINDIR)/$(CONFIG)/message_compress_test $(BINDIR)/$(CONFIG)/metadata_buffer_test $(BINDIR)/$(CONFIG)/multi_init_test $(BINDIR)/$(CONFIG)/murmur_hash_test $(BINDIR)/$(CONFIG)/no_server_test $(BINDIR)/$(CONFIG)/poll_kick_posix_test $(BINDIR)/$(CONFIG)/resolve_address_test $(BINDIR)/$(CONFIG)/secure_endpoint_test $(BINDIR)/$(CONFIG)/sockaddr_utils_test $(BINDIR)/$(CONFIG)/tcp_client_posix_test $(BINDIR)/$(CONFIG)/tcp_posix_test $(BINDIR)/$(CONFIG)/tcp_server_posix_test $(BINDIR)/$(CONFIG)/time_averaged_stats_test $(BINDIR)/$(CONFIG)/time_test $(BINDIR)/$(CONFIG)/timeout_encoding_test $(BINDIR)/$(CONFIG)/transport_metadata_test $(BINDIR)/$(CONFIG)/transport_security_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_bad_hostname_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_cancel_after_accept_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_cancel_after_accept_and_writes_closed_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_cancel_after_invoke_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_cancel_before_invoke_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_cancel_in_a_vacuum_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_census_simple_request_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_disappearing_server_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_early_server_shutdown_finishes_inflight_calls_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_early_server_shutdown_finishes_tags_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_empty_batch_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_graceful_server_shutdown_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_invoke_large_request_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_max_concurrent_streams_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_no_op_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_ping_pong_streaming_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_request_response_with_binary_metadata_and_payload_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_request_response_with_metadata_and_payload_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_request_response_with_payload_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_request_with_large_metadata_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_request_with_payload_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_simple_delayed_request_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_simple_request_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_thread_stress_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_writes_done_hangs_with_pending_read_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_cancel_after_accept_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_cancel_after_accept_and_writes_closed_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_cancel_after_invoke_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_cancel_before_invoke_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_cancel_in_a_vacuum_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_census_simple_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_disappearing_server_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_early_server_shutdown_finishes_inflight_calls_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_early_server_shutdown_finishes_tags_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_graceful_server_shutdown_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_invoke_large_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_max_concurrent_streams_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_no_op_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_ping_pong_streaming_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_request_response_with_binary_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_request_response_with_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_request_response_with_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_request_response_with_trailing_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_request_with_large_metadata_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_request_with_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_simple_delayed_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_simple_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_thread_stress_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_writes_done_hangs_with_pending_read_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_bad_hostname_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_cancel_after_accept_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_cancel_after_accept_and_writes_closed_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_cancel_after_invoke_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_cancel_before_invoke_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_cancel_in_a_vacuum_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_census_simple_request_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_disappearing_server_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_early_server_shutdown_finishes_inflight_calls_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_early_server_shutdown_finishes_tags_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_empty_batch_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_graceful_server_shutdown_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_invoke_large_request_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_max_concurrent_streams_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_no_op_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_ping_pong_streaming_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_request_response_with_binary_metadata_and_payload_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_request_response_with_metadata_and_payload_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_request_response_with_payload_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_request_with_large_metadata_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_request_with_payload_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_simple_delayed_request_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_simple_request_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_thread_stress_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_writes_done_hangs_with_pending_read_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_cancel_after_accept_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_cancel_after_accept_and_writes_closed_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_cancel_after_invoke_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_cancel_before_invoke_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_cancel_in_a_vacuum_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_census_simple_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_disappearing_server_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_early_server_shutdown_finishes_inflight_calls_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_early_server_shutdown_finishes_tags_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_graceful_server_shutdown_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_invoke_large_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_max_concurrent_streams_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_no_op_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_ping_pong_streaming_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_request_response_with_binary_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_request_response_with_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_request_response_with_payload_legacy_test 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$(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_disappearing_server_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_early_server_shutdown_finishes_inflight_calls_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_early_server_shutdown_finishes_tags_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_graceful_server_shutdown_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_invoke_large_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_max_concurrent_streams_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_no_op_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_ping_pong_streaming_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_request_response_with_binary_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_request_response_with_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_request_response_with_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_request_response_with_trailing_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_request_with_large_metadata_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_request_with_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_simple_delayed_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_simple_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_thread_stress_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_writes_done_hangs_with_pending_read_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_bad_hostname_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_cancel_after_accept_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_cancel_after_accept_and_writes_closed_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_cancel_after_invoke_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_cancel_before_invoke_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_cancel_in_a_vacuum_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_census_simple_request_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_disappearing_server_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_early_server_shutdown_finishes_inflight_calls_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_early_server_shutdown_finishes_tags_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_empty_batch_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_graceful_server_shutdown_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_invoke_large_request_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_max_concurrent_streams_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_no_op_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_ping_pong_streaming_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_request_response_with_binary_metadata_and_payload_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_request_response_with_metadata_and_payload_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_request_response_with_payload_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_request_with_large_metadata_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_request_with_payload_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_simple_delayed_request_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_simple_request_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_thread_stress_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_writes_done_hangs_with_pending_read_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_cancel_after_accept_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_cancel_after_accept_and_writes_closed_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_cancel_after_invoke_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_cancel_before_invoke_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_cancel_in_a_vacuum_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_census_simple_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_disappearing_server_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_early_server_shutdown_finishes_inflight_calls_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_early_server_shutdown_finishes_tags_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_graceful_server_shutdown_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_invoke_large_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_max_concurrent_streams_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_no_op_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_ping_pong_streaming_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_request_response_with_binary_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_request_response_with_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_request_response_with_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_request_response_with_trailing_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_request_with_large_metadata_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_request_with_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_simple_delayed_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_simple_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_thread_stress_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_writes_done_hangs_with_pending_read_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_bad_hostname_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_cancel_after_accept_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_cancel_after_accept_and_writes_closed_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_cancel_after_invoke_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_cancel_before_invoke_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_cancel_in_a_vacuum_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_census_simple_request_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_disappearing_server_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_early_server_shutdown_finishes_inflight_calls_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_early_server_shutdown_finishes_tags_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_empty_batch_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_graceful_server_shutdown_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_invoke_large_request_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_max_concurrent_streams_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_no_op_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_ping_pong_streaming_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_request_response_with_binary_metadata_and_payload_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_request_response_with_metadata_and_payload_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_request_response_with_payload_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_request_with_large_metadata_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_request_with_payload_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_simple_delayed_request_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_simple_request_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_thread_stress_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_writes_done_hangs_with_pending_read_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_cancel_after_accept_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_cancel_after_accept_and_writes_closed_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_cancel_after_invoke_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_cancel_before_invoke_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_cancel_in_a_vacuum_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_census_simple_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_disappearing_server_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_early_server_shutdown_finishes_inflight_calls_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_early_server_shutdown_finishes_tags_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_graceful_server_shutdown_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_invoke_large_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_max_concurrent_streams_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_no_op_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_ping_pong_streaming_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_request_response_with_binary_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_request_response_with_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_request_response_with_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_request_response_with_trailing_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_request_with_large_metadata_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_request_with_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_simple_delayed_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_simple_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_thread_stress_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_writes_done_hangs_with_pending_read_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_bad_hostname_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_cancel_after_accept_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_cancel_after_accept_and_writes_closed_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_cancel_after_invoke_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_cancel_before_invoke_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_cancel_in_a_vacuum_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_census_simple_request_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_disappearing_server_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_early_server_shutdown_finishes_inflight_calls_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_early_server_shutdown_finishes_tags_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_empty_batch_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_graceful_server_shutdown_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_invoke_large_request_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_max_concurrent_streams_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_no_op_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_ping_pong_streaming_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_request_response_with_binary_metadata_and_payload_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_request_response_with_metadata_and_payload_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_request_response_with_payload_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_request_with_large_metadata_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_request_with_payload_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_simple_delayed_request_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_simple_request_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_thread_stress_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_writes_done_hangs_with_pending_read_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_cancel_after_accept_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_cancel_after_accept_and_writes_closed_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_cancel_after_invoke_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_cancel_before_invoke_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_cancel_in_a_vacuum_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_census_simple_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_disappearing_server_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_early_server_shutdown_finishes_inflight_calls_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_early_server_shutdown_finishes_tags_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_graceful_server_shutdown_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_invoke_large_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_max_concurrent_streams_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_no_op_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_ping_pong_streaming_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_request_response_with_binary_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_request_response_with_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_request_response_with_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_request_response_with_trailing_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_request_with_large_metadata_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_request_with_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_simple_delayed_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_simple_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_thread_stress_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_writes_done_hangs_with_pending_read_legacy_test
 
-buildtests_cxx: privatelibs_cxx $(BINDIR)/$(CONFIG)/async_end2end_test $(BINDIR)/$(CONFIG)/channel_arguments_test $(BINDIR)/$(CONFIG)/cli_call_test $(BINDIR)/$(CONFIG)/credentials_test $(BINDIR)/$(CONFIG)/cxx_time_test $(BINDIR)/$(CONFIG)/end2end_test $(BINDIR)/$(CONFIG)/generic_end2end_test $(BINDIR)/$(CONFIG)/grpc_cli $(BINDIR)/$(CONFIG)/interop_client $(BINDIR)/$(CONFIG)/interop_server $(BINDIR)/$(CONFIG)/interop_test $(BINDIR)/$(CONFIG)/pubsub_client $(BINDIR)/$(CONFIG)/pubsub_publisher_test $(BINDIR)/$(CONFIG)/pubsub_subscriber_test $(BINDIR)/$(CONFIG)/qps_driver $(BINDIR)/$(CONFIG)/qps_worker $(BINDIR)/$(CONFIG)/status_test $(BINDIR)/$(CONFIG)/thread_pool_test
+buildtests_cxx: privatelibs_cxx $(BINDIR)/$(CONFIG)/async_end2end_test $(BINDIR)/$(CONFIG)/channel_arguments_test $(BINDIR)/$(CONFIG)/cli_call_test $(BINDIR)/$(CONFIG)/credentials_test $(BINDIR)/$(CONFIG)/cxx_time_test $(BINDIR)/$(CONFIG)/end2end_test $(BINDIR)/$(CONFIG)/generic_end2end_test $(BINDIR)/$(CONFIG)/grpc_cli $(BINDIR)/$(CONFIG)/interop_client $(BINDIR)/$(CONFIG)/interop_server $(BINDIR)/$(CONFIG)/interop_test $(BINDIR)/$(CONFIG)/pubsub_client $(BINDIR)/$(CONFIG)/pubsub_publisher_test $(BINDIR)/$(CONFIG)/pubsub_subscriber_test $(BINDIR)/$(CONFIG)/qps_driver $(BINDIR)/$(CONFIG)/qps_smoke_test $(BINDIR)/$(CONFIG)/qps_worker $(BINDIR)/$(CONFIG)/status_test $(BINDIR)/$(CONFIG)/thread_pool_test
 
 test: test_c test_cxx
 
@@ -1156,6 +1158,8 @@ test_c: buildtests_c
 	$(Q) $(BINDIR)/$(CONFIG)/gpr_thd_test || ( echo test gpr_thd_test failed ; exit 1 )
 	$(E) "[RUN]     Testing gpr_time_test"
 	$(Q) $(BINDIR)/$(CONFIG)/gpr_time_test || ( echo test gpr_time_test failed ; exit 1 )
+	$(E) "[RUN]     Testing gpr_tls_test"
+	$(Q) $(BINDIR)/$(CONFIG)/gpr_tls_test || ( echo test gpr_tls_test failed ; exit 1 )
 	$(E) "[RUN]     Testing gpr_useful_test"
 	$(Q) $(BINDIR)/$(CONFIG)/gpr_useful_test || ( echo test gpr_useful_test failed ; exit 1 )
 	$(E) "[RUN]     Testing grpc_base64_test"
@@ -2001,92 +2005,152 @@ endif
 
 ifeq ($(NO_PROTOC),true)
 $(GENDIR)/examples/pubsub/empty.pb.cc: protoc_dep_error
+$(GENDIR)/examples/pubsub/empty.grpc.pb.cc: protoc_dep_error
 else
 $(GENDIR)/examples/pubsub/empty.pb.cc: examples/pubsub/empty.proto $(PROTOBUF_DEP) $(PROTOC_PLUGINS)
 	$(E) "[PROTOC]  Generating protobuf CC file from $<"
 	$(Q) mkdir -p `dirname $@`
-	$(Q) $(PROTOC) --cpp_out=$(GENDIR) --grpc_out=$(GENDIR) --plugin=protoc-gen-grpc=$(BINDIR)/$(CONFIG)/grpc_cpp_plugin $<
+	$(Q) $(PROTOC) --cpp_out=$(GENDIR) $<
+
+$(GENDIR)/examples/pubsub/empty.grpc.pb.cc: examples/pubsub/empty.proto $(PROTOBUF_DEP) $(PROTOC_PLUGINS)
+	$(E) "[GRPC]    Generating gRPC's protobuf service CC file from $<"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(PROTOC) --grpc_out=$(GENDIR) --plugin=protoc-gen-grpc=$(BINDIR)/$(CONFIG)/grpc_cpp_plugin $<
 endif
 
 ifeq ($(NO_PROTOC),true)
 $(GENDIR)/examples/pubsub/label.pb.cc: protoc_dep_error
+$(GENDIR)/examples/pubsub/label.grpc.pb.cc: protoc_dep_error
 else
 $(GENDIR)/examples/pubsub/label.pb.cc: examples/pubsub/label.proto $(PROTOBUF_DEP) $(PROTOC_PLUGINS)
 	$(E) "[PROTOC]  Generating protobuf CC file from $<"
 	$(Q) mkdir -p `dirname $@`
-	$(Q) $(PROTOC) --cpp_out=$(GENDIR) --grpc_out=$(GENDIR) --plugin=protoc-gen-grpc=$(BINDIR)/$(CONFIG)/grpc_cpp_plugin $<
+	$(Q) $(PROTOC) --cpp_out=$(GENDIR) $<
+
+$(GENDIR)/examples/pubsub/label.grpc.pb.cc: examples/pubsub/label.proto $(PROTOBUF_DEP) $(PROTOC_PLUGINS)
+	$(E) "[GRPC]    Generating gRPC's protobuf service CC file from $<"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(PROTOC) --grpc_out=$(GENDIR) --plugin=protoc-gen-grpc=$(BINDIR)/$(CONFIG)/grpc_cpp_plugin $<
 endif
 
 ifeq ($(NO_PROTOC),true)
 $(GENDIR)/examples/pubsub/pubsub.pb.cc: protoc_dep_error
+$(GENDIR)/examples/pubsub/pubsub.grpc.pb.cc: protoc_dep_error
 else
 $(GENDIR)/examples/pubsub/pubsub.pb.cc: examples/pubsub/pubsub.proto $(PROTOBUF_DEP) $(PROTOC_PLUGINS)
 	$(E) "[PROTOC]  Generating protobuf CC file from $<"
 	$(Q) mkdir -p `dirname $@`
-	$(Q) $(PROTOC) --cpp_out=$(GENDIR) --grpc_out=$(GENDIR) --plugin=protoc-gen-grpc=$(BINDIR)/$(CONFIG)/grpc_cpp_plugin $<
+	$(Q) $(PROTOC) --cpp_out=$(GENDIR) $<
+
+$(GENDIR)/examples/pubsub/pubsub.grpc.pb.cc: examples/pubsub/pubsub.proto $(PROTOBUF_DEP) $(PROTOC_PLUGINS)
+	$(E) "[GRPC]    Generating gRPC's protobuf service CC file from $<"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(PROTOC) --grpc_out=$(GENDIR) --plugin=protoc-gen-grpc=$(BINDIR)/$(CONFIG)/grpc_cpp_plugin $<
 endif
 
 ifeq ($(NO_PROTOC),true)
 $(GENDIR)/test/cpp/interop/empty.pb.cc: protoc_dep_error
+$(GENDIR)/test/cpp/interop/empty.grpc.pb.cc: protoc_dep_error
 else
 $(GENDIR)/test/cpp/interop/empty.pb.cc: test/cpp/interop/empty.proto $(PROTOBUF_DEP) $(PROTOC_PLUGINS)
 	$(E) "[PROTOC]  Generating protobuf CC file from $<"
 	$(Q) mkdir -p `dirname $@`
-	$(Q) $(PROTOC) --cpp_out=$(GENDIR) --grpc_out=$(GENDIR) --plugin=protoc-gen-grpc=$(BINDIR)/$(CONFIG)/grpc_cpp_plugin $<
+	$(Q) $(PROTOC) --cpp_out=$(GENDIR) $<
+
+$(GENDIR)/test/cpp/interop/empty.grpc.pb.cc: test/cpp/interop/empty.proto $(PROTOBUF_DEP) $(PROTOC_PLUGINS)
+	$(E) "[GRPC]    Generating gRPC's protobuf service CC file from $<"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(PROTOC) --grpc_out=$(GENDIR) --plugin=protoc-gen-grpc=$(BINDIR)/$(CONFIG)/grpc_cpp_plugin $<
 endif
 
 ifeq ($(NO_PROTOC),true)
 $(GENDIR)/test/cpp/interop/messages.pb.cc: protoc_dep_error
+$(GENDIR)/test/cpp/interop/messages.grpc.pb.cc: protoc_dep_error
 else
 $(GENDIR)/test/cpp/interop/messages.pb.cc: test/cpp/interop/messages.proto $(PROTOBUF_DEP) $(PROTOC_PLUGINS)
 	$(E) "[PROTOC]  Generating protobuf CC file from $<"
 	$(Q) mkdir -p `dirname $@`
-	$(Q) $(PROTOC) --cpp_out=$(GENDIR) --grpc_out=$(GENDIR) --plugin=protoc-gen-grpc=$(BINDIR)/$(CONFIG)/grpc_cpp_plugin $<
+	$(Q) $(PROTOC) --cpp_out=$(GENDIR) $<
+
+$(GENDIR)/test/cpp/interop/messages.grpc.pb.cc: test/cpp/interop/messages.proto $(PROTOBUF_DEP) $(PROTOC_PLUGINS)
+	$(E) "[GRPC]    Generating gRPC's protobuf service CC file from $<"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(PROTOC) --grpc_out=$(GENDIR) --plugin=protoc-gen-grpc=$(BINDIR)/$(CONFIG)/grpc_cpp_plugin $<
 endif
 
 ifeq ($(NO_PROTOC),true)
 $(GENDIR)/test/cpp/interop/test.pb.cc: protoc_dep_error
+$(GENDIR)/test/cpp/interop/test.grpc.pb.cc: protoc_dep_error
 else
 $(GENDIR)/test/cpp/interop/test.pb.cc: test/cpp/interop/test.proto $(PROTOBUF_DEP) $(PROTOC_PLUGINS)
 	$(E) "[PROTOC]  Generating protobuf CC file from $<"
 	$(Q) mkdir -p `dirname $@`
-	$(Q) $(PROTOC) --cpp_out=$(GENDIR) --grpc_out=$(GENDIR) --plugin=protoc-gen-grpc=$(BINDIR)/$(CONFIG)/grpc_cpp_plugin $<
+	$(Q) $(PROTOC) --cpp_out=$(GENDIR) $<
+
+$(GENDIR)/test/cpp/interop/test.grpc.pb.cc: test/cpp/interop/test.proto $(PROTOBUF_DEP) $(PROTOC_PLUGINS)
+	$(E) "[GRPC]    Generating gRPC's protobuf service CC file from $<"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(PROTOC) --grpc_out=$(GENDIR) --plugin=protoc-gen-grpc=$(BINDIR)/$(CONFIG)/grpc_cpp_plugin $<
 endif
 
 ifeq ($(NO_PROTOC),true)
 $(GENDIR)/test/cpp/qps/qpstest.pb.cc: protoc_dep_error
+$(GENDIR)/test/cpp/qps/qpstest.grpc.pb.cc: protoc_dep_error
 else
 $(GENDIR)/test/cpp/qps/qpstest.pb.cc: test/cpp/qps/qpstest.proto $(PROTOBUF_DEP) $(PROTOC_PLUGINS)
 	$(E) "[PROTOC]  Generating protobuf CC file from $<"
 	$(Q) mkdir -p `dirname $@`
-	$(Q) $(PROTOC) --cpp_out=$(GENDIR) --grpc_out=$(GENDIR) --plugin=protoc-gen-grpc=$(BINDIR)/$(CONFIG)/grpc_cpp_plugin $<
+	$(Q) $(PROTOC) --cpp_out=$(GENDIR) $<
+
+$(GENDIR)/test/cpp/qps/qpstest.grpc.pb.cc: test/cpp/qps/qpstest.proto $(PROTOBUF_DEP) $(PROTOC_PLUGINS)
+	$(E) "[GRPC]    Generating gRPC's protobuf service CC file from $<"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(PROTOC) --grpc_out=$(GENDIR) --plugin=protoc-gen-grpc=$(BINDIR)/$(CONFIG)/grpc_cpp_plugin $<
 endif
 
 ifeq ($(NO_PROTOC),true)
 $(GENDIR)/test/cpp/util/echo.pb.cc: protoc_dep_error
+$(GENDIR)/test/cpp/util/echo.grpc.pb.cc: protoc_dep_error
 else
 $(GENDIR)/test/cpp/util/echo.pb.cc: test/cpp/util/echo.proto $(PROTOBUF_DEP) $(PROTOC_PLUGINS)
 	$(E) "[PROTOC]  Generating protobuf CC file from $<"
 	$(Q) mkdir -p `dirname $@`
-	$(Q) $(PROTOC) --cpp_out=$(GENDIR) --grpc_out=$(GENDIR) --plugin=protoc-gen-grpc=$(BINDIR)/$(CONFIG)/grpc_cpp_plugin $<
+	$(Q) $(PROTOC) --cpp_out=$(GENDIR) $<
+
+$(GENDIR)/test/cpp/util/echo.grpc.pb.cc: test/cpp/util/echo.proto $(PROTOBUF_DEP) $(PROTOC_PLUGINS)
+	$(E) "[GRPC]    Generating gRPC's protobuf service CC file from $<"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(PROTOC) --grpc_out=$(GENDIR) --plugin=protoc-gen-grpc=$(BINDIR)/$(CONFIG)/grpc_cpp_plugin $<
 endif
 
 ifeq ($(NO_PROTOC),true)
 $(GENDIR)/test/cpp/util/echo_duplicate.pb.cc: protoc_dep_error
+$(GENDIR)/test/cpp/util/echo_duplicate.grpc.pb.cc: protoc_dep_error
 else
 $(GENDIR)/test/cpp/util/echo_duplicate.pb.cc: test/cpp/util/echo_duplicate.proto $(PROTOBUF_DEP) $(PROTOC_PLUGINS)
 	$(E) "[PROTOC]  Generating protobuf CC file from $<"
 	$(Q) mkdir -p `dirname $@`
-	$(Q) $(PROTOC) --cpp_out=$(GENDIR) --grpc_out=$(GENDIR) --plugin=protoc-gen-grpc=$(BINDIR)/$(CONFIG)/grpc_cpp_plugin $<
+	$(Q) $(PROTOC) --cpp_out=$(GENDIR) $<
+
+$(GENDIR)/test/cpp/util/echo_duplicate.grpc.pb.cc: test/cpp/util/echo_duplicate.proto $(PROTOBUF_DEP) $(PROTOC_PLUGINS)
+	$(E) "[GRPC]    Generating gRPC's protobuf service CC file from $<"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(PROTOC) --grpc_out=$(GENDIR) --plugin=protoc-gen-grpc=$(BINDIR)/$(CONFIG)/grpc_cpp_plugin $<
 endif
 
 ifeq ($(NO_PROTOC),true)
 $(GENDIR)/test/cpp/util/messages.pb.cc: protoc_dep_error
+$(GENDIR)/test/cpp/util/messages.grpc.pb.cc: protoc_dep_error
 else
 $(GENDIR)/test/cpp/util/messages.pb.cc: test/cpp/util/messages.proto $(PROTOBUF_DEP) $(PROTOC_PLUGINS)
 	$(E) "[PROTOC]  Generating protobuf CC file from $<"
 	$(Q) mkdir -p `dirname $@`
-	$(Q) $(PROTOC) --cpp_out=$(GENDIR) --grpc_out=$(GENDIR) --plugin=protoc-gen-grpc=$(BINDIR)/$(CONFIG)/grpc_cpp_plugin $<
+	$(Q) $(PROTOC) --cpp_out=$(GENDIR) $<
+
+$(GENDIR)/test/cpp/util/messages.grpc.pb.cc: test/cpp/util/messages.proto $(PROTOBUF_DEP) $(PROTOC_PLUGINS)
+	$(E) "[GRPC]    Generating gRPC's protobuf service CC file from $<"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(PROTOC) --grpc_out=$(GENDIR) --plugin=protoc-gen-grpc=$(BINDIR)/$(CONFIG)/grpc_cpp_plugin $<
 endif
 
 
@@ -2163,10 +2227,11 @@ ifeq ($(SYSTEM),MINGW32)
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/gpr.$(SHARED_EXT) $(prefix)/lib/gpr.$(SHARED_EXT)
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/libgpr-imp.a $(prefix)/lib/libgpr-imp.a
 else
-ifneq ($(SYSTEM),Darwin)
 	$(E) "[INSTALL] Installing libgpr.$(SHARED_EXT)"
 	$(Q) $(INSTALL) -d $(prefix)/lib
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/libgpr.$(SHARED_EXT) $(prefix)/lib/libgpr.$(SHARED_EXT)
+ifneq ($(SYSTEM),Darwin)
+	$(Q) ln -sf libgpr.$(SHARED_EXT) $(prefix)/lib/libgpr.so.0
 	$(Q) ln -sf libgpr.$(SHARED_EXT) $(prefix)/lib/libgpr.so
 endif
 endif
@@ -2176,10 +2241,11 @@ ifeq ($(SYSTEM),MINGW32)
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/grpc.$(SHARED_EXT) $(prefix)/lib/grpc.$(SHARED_EXT)
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/libgrpc-imp.a $(prefix)/lib/libgrpc-imp.a
 else
-ifneq ($(SYSTEM),Darwin)
 	$(E) "[INSTALL] Installing libgrpc.$(SHARED_EXT)"
 	$(Q) $(INSTALL) -d $(prefix)/lib
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/libgrpc.$(SHARED_EXT) $(prefix)/lib/libgrpc.$(SHARED_EXT)
+ifneq ($(SYSTEM),Darwin)
+	$(Q) ln -sf libgrpc.$(SHARED_EXT) $(prefix)/lib/libgrpc.so.0
 	$(Q) ln -sf libgrpc.$(SHARED_EXT) $(prefix)/lib/libgrpc.so
 endif
 endif
@@ -2189,10 +2255,11 @@ ifeq ($(SYSTEM),MINGW32)
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/grpc_unsecure.$(SHARED_EXT) $(prefix)/lib/grpc_unsecure.$(SHARED_EXT)
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/libgrpc_unsecure-imp.a $(prefix)/lib/libgrpc_unsecure-imp.a
 else
-ifneq ($(SYSTEM),Darwin)
 	$(E) "[INSTALL] Installing libgrpc_unsecure.$(SHARED_EXT)"
 	$(Q) $(INSTALL) -d $(prefix)/lib
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/libgrpc_unsecure.$(SHARED_EXT) $(prefix)/lib/libgrpc_unsecure.$(SHARED_EXT)
+ifneq ($(SYSTEM),Darwin)
+	$(Q) ln -sf libgrpc_unsecure.$(SHARED_EXT) $(prefix)/lib/libgrpc_unsecure.so.0
 	$(Q) ln -sf libgrpc_unsecure.$(SHARED_EXT) $(prefix)/lib/libgrpc_unsecure.so
 endif
 endif
@@ -2210,10 +2277,11 @@ ifeq ($(SYSTEM),MINGW32)
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/grpc++.$(SHARED_EXT) $(prefix)/lib/grpc++.$(SHARED_EXT)
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/libgrpc++-imp.a $(prefix)/lib/libgrpc++-imp.a
 else
-ifneq ($(SYSTEM),Darwin)
 	$(E) "[INSTALL] Installing libgrpc++.$(SHARED_EXT)"
 	$(Q) $(INSTALL) -d $(prefix)/lib
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/libgrpc++.$(SHARED_EXT) $(prefix)/lib/libgrpc++.$(SHARED_EXT)
+ifneq ($(SYSTEM),Darwin)
+	$(Q) ln -sf libgrpc++.$(SHARED_EXT) $(prefix)/lib/libgrpc++.so.0
 	$(Q) ln -sf libgrpc++.$(SHARED_EXT) $(prefix)/lib/libgrpc++.so
 endif
 endif
@@ -2223,10 +2291,11 @@ ifeq ($(SYSTEM),MINGW32)
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/grpc++_unsecure.$(SHARED_EXT) $(prefix)/lib/grpc++_unsecure.$(SHARED_EXT)
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/libgrpc++_unsecure-imp.a $(prefix)/lib/libgrpc++_unsecure-imp.a
 else
-ifneq ($(SYSTEM),Darwin)
 	$(E) "[INSTALL] Installing libgrpc++_unsecure.$(SHARED_EXT)"
 	$(Q) $(INSTALL) -d $(prefix)/lib
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/libgrpc++_unsecure.$(SHARED_EXT) $(prefix)/lib/libgrpc++_unsecure.$(SHARED_EXT)
+ifneq ($(SYSTEM),Darwin)
+	$(Q) ln -sf libgrpc++_unsecure.$(SHARED_EXT) $(prefix)/lib/libgrpc++_unsecure.so.0
 	$(Q) ln -sf libgrpc++_unsecure.$(SHARED_EXT) $(prefix)/lib/libgrpc++_unsecure.so
 endif
 endif
@@ -2244,10 +2313,11 @@ ifeq ($(SYSTEM),MINGW32)
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/grpc_csharp_ext.$(SHARED_EXT) $(prefix)/lib/grpc_csharp_ext.$(SHARED_EXT)
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/libgrpc_csharp_ext-imp.a $(prefix)/lib/libgrpc_csharp_ext-imp.a
 else
-ifneq ($(SYSTEM),Darwin)
 	$(E) "[INSTALL] Installing libgrpc_csharp_ext.$(SHARED_EXT)"
 	$(Q) $(INSTALL) -d $(prefix)/lib
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/libgrpc_csharp_ext.$(SHARED_EXT) $(prefix)/lib/libgrpc_csharp_ext.$(SHARED_EXT)
+ifneq ($(SYSTEM),Darwin)
+	$(Q) ln -sf libgrpc_csharp_ext.$(SHARED_EXT) $(prefix)/lib/libgrpc_csharp_ext.so.0
 	$(Q) ln -sf libgrpc_csharp_ext.$(SHARED_EXT) $(prefix)/lib/libgrpc_csharp_ext.so
 endif
 endif
@@ -2266,6 +2336,8 @@ else
 	$(Q) $(INSTALL) -d $(prefix)/bin
 	$(Q) $(INSTALL) $(BINDIR)/$(CONFIG)/grpc_cpp_plugin $(prefix)/bin/grpc_cpp_plugin
 	$(Q) $(INSTALL) -d $(prefix)/bin
+	$(Q) $(INSTALL) $(BINDIR)/$(CONFIG)/grpc_objective_c_plugin $(prefix)/bin/grpc_objective_c_plugin
+	$(Q) $(INSTALL) -d $(prefix)/bin
 	$(Q) $(INSTALL) $(BINDIR)/$(CONFIG)/grpc_python_plugin $(prefix)/bin/grpc_python_plugin
 	$(Q) $(INSTALL) -d $(prefix)/bin
 	$(Q) $(INSTALL) $(BINDIR)/$(CONFIG)/grpc_ruby_plugin $(prefix)/bin/grpc_ruby_plugin
@@ -2334,6 +2406,7 @@ LIBGPR_SRC = \
     src/core/support/sync.c \
     src/core/support/sync_posix.c \
     src/core/support/sync_win32.c \
+    src/core/support/thd.c \
     src/core/support/thd_posix.c \
     src/core/support/thd_win32.c \
     src/core/support/time.c \
@@ -2362,6 +2435,10 @@ PUBLIC_HEADERS_C += \
     include/grpc/support/sync_win32.h \
     include/grpc/support/thd.h \
     include/grpc/support/time.h \
+    include/grpc/support/tls.h \
+    include/grpc/support/tls_gcc.h \
+    include/grpc/support/tls_msvc.h \
+    include/grpc/support/tls_pthread.h \
     include/grpc/support/useful.h \
 
 LIBGPR_OBJS = $(addprefix $(OBJDIR)/$(CONFIG)/, $(addsuffix .o, $(basename $(LIBGPR_SRC))))
@@ -2387,7 +2464,7 @@ $(LIBDIR)/$(CONFIG)/libgpr.$(SHARED_EXT): $(LIBGPR_OBJS)  $(ZLIB_DEP)
 	$(E) "[LD]      Linking $@"
 	$(Q) mkdir -p `dirname $@`
 ifeq ($(SYSTEM),Darwin)
-	$(Q) $(LD) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -dynamiclib -o $(LIBDIR)/$(CONFIG)/libgpr.$(SHARED_EXT) $(LIBGPR_OBJS) $(LDLIBS)
+	$(Q) $(LD) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -install_name libgpr.$(SHARED_EXT) -dynamiclib -o $(LIBDIR)/$(CONFIG)/libgpr.$(SHARED_EXT) $(LIBGPR_OBJS) $(LDLIBS)
 else
 	$(Q) $(LD) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,-soname,libgpr.so.0 -o $(LIBDIR)/$(CONFIG)/libgpr.$(SHARED_EXT) $(LIBGPR_OBJS) $(LDLIBS)
 	$(Q) ln -sf libgpr.$(SHARED_EXT) $(LIBDIR)/$(CONFIG)/libgpr.so.0
@@ -2428,6 +2505,7 @@ $(OBJDIR)/$(CONFIG)/src/core/support/string_win32.o:
 $(OBJDIR)/$(CONFIG)/src/core/support/sync.o: 
 $(OBJDIR)/$(CONFIG)/src/core/support/sync_posix.o: 
 $(OBJDIR)/$(CONFIG)/src/core/support/sync_win32.o: 
+$(OBJDIR)/$(CONFIG)/src/core/support/thd.o: 
 $(OBJDIR)/$(CONFIG)/src/core/support/thd_posix.o: 
 $(OBJDIR)/$(CONFIG)/src/core/support/thd_win32.o: 
 $(OBJDIR)/$(CONFIG)/src/core/support/time.o: 
@@ -2778,7 +2856,7 @@ $(LIBDIR)/$(CONFIG)/libgrpc.$(SHARED_EXT): $(LIBGRPC_OBJS)  $(ZLIB_DEP) $(LIBDIR
 	$(E) "[LD]      Linking $@"
 	$(Q) mkdir -p `dirname $@`
 ifeq ($(SYSTEM),Darwin)
-	$(Q) $(LD) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -dynamiclib -o $(LIBDIR)/$(CONFIG)/libgrpc.$(SHARED_EXT) $(LIBGRPC_OBJS) $(LDLIBS) $(LDLIBS_SECURE) $(OPENSSL_MERGE_LIBS) -lgpr
+	$(Q) $(LD) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -install_name libgrpc.$(SHARED_EXT) -dynamiclib -o $(LIBDIR)/$(CONFIG)/libgrpc.$(SHARED_EXT) $(LIBGRPC_OBJS) $(LDLIBS) $(LDLIBS_SECURE) $(OPENSSL_MERGE_LIBS) -lgpr
 else
 	$(Q) $(LD) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,-soname,libgrpc.so.0 -o $(LIBDIR)/$(CONFIG)/libgrpc.$(SHARED_EXT) $(LIBGRPC_OBJS) $(LDLIBS) $(LDLIBS_SECURE) $(OPENSSL_MERGE_LIBS) -lgpr
 	$(Q) ln -sf libgrpc.$(SHARED_EXT) $(LIBDIR)/$(CONFIG)/libgrpc.so.0
@@ -3123,7 +3201,7 @@ $(LIBDIR)/$(CONFIG)/libgrpc_unsecure.$(SHARED_EXT): $(LIBGRPC_UNSECURE_OBJS)  $(
 	$(E) "[LD]      Linking $@"
 	$(Q) mkdir -p `dirname $@`
 ifeq ($(SYSTEM),Darwin)
-	$(Q) $(LD) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -dynamiclib -o $(LIBDIR)/$(CONFIG)/libgrpc_unsecure.$(SHARED_EXT) $(LIBGRPC_UNSECURE_OBJS) $(LDLIBS) -lgpr
+	$(Q) $(LD) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -install_name libgrpc_unsecure.$(SHARED_EXT) -dynamiclib -o $(LIBDIR)/$(CONFIG)/libgrpc_unsecure.$(SHARED_EXT) $(LIBGRPC_UNSECURE_OBJS) $(LDLIBS) -lgpr
 else
 	$(Q) $(LD) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,-soname,libgrpc_unsecure.so.0 -o $(LIBDIR)/$(CONFIG)/libgrpc_unsecure.$(SHARED_EXT) $(LIBGRPC_UNSECURE_OBJS) $(LDLIBS) -lgpr
 	$(Q) ln -sf libgrpc_unsecure.$(SHARED_EXT) $(LIBDIR)/$(CONFIG)/libgrpc_unsecure.so.0
@@ -3281,6 +3359,12 @@ PUBLIC_HEADERS_CXX += \
     include/grpc++/impl/rpc_method.h \
     include/grpc++/impl/rpc_service_method.h \
     include/grpc++/impl/service_type.h \
+    include/grpc++/impl/sync.h \
+    include/grpc++/impl/sync_cxx11.h \
+    include/grpc++/impl/sync_no_cxx11.h \
+    include/grpc++/impl/thd.h \
+    include/grpc++/impl/thd_cxx11.h \
+    include/grpc++/impl/thd_no_cxx11.h \
     include/grpc++/server.h \
     include/grpc++/server_builder.h \
     include/grpc++/server_context.h \
@@ -3374,7 +3458,7 @@ $(LIBDIR)/$(CONFIG)/libgrpc++.$(SHARED_EXT): $(LIBGRPC++_OBJS)  $(ZLIB_DEP) $(LI
 	$(E) "[LD]      Linking $@"
 	$(Q) mkdir -p `dirname $@`
 ifeq ($(SYSTEM),Darwin)
-	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -dynamiclib -o $(LIBDIR)/$(CONFIG)/libgrpc++.$(SHARED_EXT) $(LIBGRPC++_OBJS) $(LDLIBS) $(LDLIBSXX) $(LDLIBS_PROTOBUF) -lgpr -lgrpc
+	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -install_name libgrpc++.$(SHARED_EXT) -dynamiclib -o $(LIBDIR)/$(CONFIG)/libgrpc++.$(SHARED_EXT) $(LIBGRPC++_OBJS) $(LDLIBS) $(LDLIBSXX) $(LDLIBS_PROTOBUF) -lgpr -lgrpc
 else
 	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,-soname,libgrpc++.so.0 -o $(LIBDIR)/$(CONFIG)/libgrpc++.$(SHARED_EXT) $(LIBGRPC++_OBJS) $(LDLIBS) $(LDLIBSXX) $(LDLIBS_PROTOBUF) -lgpr -lgrpc
 	$(Q) ln -sf libgrpc++.$(SHARED_EXT) $(LIBDIR)/$(CONFIG)/libgrpc++.so.0
@@ -3421,9 +3505,9 @@ $(OBJDIR)/$(CONFIG)/src/cpp/util/time.o:
 
 
 LIBGRPC++_TEST_UTIL_SRC = \
-    $(GENDIR)/test/cpp/util/messages.pb.cc \
-    $(GENDIR)/test/cpp/util/echo.pb.cc \
-    $(GENDIR)/test/cpp/util/echo_duplicate.pb.cc \
+    $(GENDIR)/test/cpp/util/messages.pb.cc $(GENDIR)/test/cpp/util/messages.grpc.pb.cc \
+    $(GENDIR)/test/cpp/util/echo.pb.cc $(GENDIR)/test/cpp/util/echo.grpc.pb.cc \
+    $(GENDIR)/test/cpp/util/echo_duplicate.pb.cc $(GENDIR)/test/cpp/util/echo_duplicate.grpc.pb.cc \
     test/cpp/util/cli_call.cc \
     test/cpp/util/create_test_channel.cc \
 
@@ -3484,8 +3568,8 @@ endif
 
 
 
-$(OBJDIR)/$(CONFIG)/test/cpp/util/cli_call.o:     $(GENDIR)/test/cpp/util/messages.pb.cc    $(GENDIR)/test/cpp/util/echo.pb.cc    $(GENDIR)/test/cpp/util/echo_duplicate.pb.cc
-$(OBJDIR)/$(CONFIG)/test/cpp/util/create_test_channel.o:     $(GENDIR)/test/cpp/util/messages.pb.cc    $(GENDIR)/test/cpp/util/echo.pb.cc    $(GENDIR)/test/cpp/util/echo_duplicate.pb.cc
+$(OBJDIR)/$(CONFIG)/test/cpp/util/cli_call.o:     $(GENDIR)/test/cpp/util/messages.pb.cc $(GENDIR)/test/cpp/util/messages.grpc.pb.cc    $(GENDIR)/test/cpp/util/echo.pb.cc $(GENDIR)/test/cpp/util/echo.grpc.pb.cc    $(GENDIR)/test/cpp/util/echo_duplicate.pb.cc $(GENDIR)/test/cpp/util/echo_duplicate.grpc.pb.cc
+$(OBJDIR)/$(CONFIG)/test/cpp/util/create_test_channel.o:     $(GENDIR)/test/cpp/util/messages.pb.cc $(GENDIR)/test/cpp/util/messages.grpc.pb.cc    $(GENDIR)/test/cpp/util/echo.pb.cc $(GENDIR)/test/cpp/util/echo.grpc.pb.cc    $(GENDIR)/test/cpp/util/echo_duplicate.pb.cc $(GENDIR)/test/cpp/util/echo_duplicate.grpc.pb.cc
 
 
 LIBGRPC++_UNSECURE_SRC = \
@@ -3532,6 +3616,12 @@ PUBLIC_HEADERS_CXX += \
     include/grpc++/impl/rpc_method.h \
     include/grpc++/impl/rpc_service_method.h \
     include/grpc++/impl/service_type.h \
+    include/grpc++/impl/sync.h \
+    include/grpc++/impl/sync_cxx11.h \
+    include/grpc++/impl/sync_no_cxx11.h \
+    include/grpc++/impl/thd.h \
+    include/grpc++/impl/thd_cxx11.h \
+    include/grpc++/impl/thd_no_cxx11.h \
     include/grpc++/server.h \
     include/grpc++/server_builder.h \
     include/grpc++/server_context.h \
@@ -3579,7 +3669,7 @@ $(LIBDIR)/$(CONFIG)/libgrpc++_unsecure.$(SHARED_EXT): $(LIBGRPC++_UNSECURE_OBJS)
 	$(E) "[LD]      Linking $@"
 	$(Q) mkdir -p `dirname $@`
 ifeq ($(SYSTEM),Darwin)
-	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -dynamiclib -o $(LIBDIR)/$(CONFIG)/libgrpc++_unsecure.$(SHARED_EXT) $(LIBGRPC++_UNSECURE_OBJS) $(LDLIBS) $(LDLIBSXX) $(LDLIBS_PROTOBUF) -lgpr -lgrpc_unsecure
+	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -install_name libgrpc++_unsecure.$(SHARED_EXT) -dynamiclib -o $(LIBDIR)/$(CONFIG)/libgrpc++_unsecure.$(SHARED_EXT) $(LIBGRPC++_UNSECURE_OBJS) $(LDLIBS) $(LDLIBSXX) $(LDLIBS_PROTOBUF) -lgpr -lgrpc_unsecure
 else
 	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,-soname,libgrpc++_unsecure.so.0 -o $(LIBDIR)/$(CONFIG)/libgrpc++_unsecure.$(SHARED_EXT) $(LIBGRPC++_UNSECURE_OBJS) $(LDLIBS) $(LDLIBSXX) $(LDLIBS_PROTOBUF) -lgpr -lgrpc_unsecure
 	$(Q) ln -sf libgrpc++_unsecure.$(SHARED_EXT) $(LIBDIR)/$(CONFIG)/libgrpc++_unsecure.so.0
@@ -3621,6 +3711,7 @@ $(OBJDIR)/$(CONFIG)/src/cpp/util/time.o:
 
 LIBGRPC_PLUGIN_SUPPORT_SRC = \
     src/compiler/cpp_generator.cc \
+    src/compiler/objective_c_generator.cc \
     src/compiler/python_generator.cc \
     src/compiler/ruby_generator.cc \
 
@@ -3655,14 +3746,139 @@ ifneq ($(NO_DEPS),true)
 endif
 
 $(OBJDIR)/$(CONFIG)/src/compiler/cpp_generator.o: 
+$(OBJDIR)/$(CONFIG)/src/compiler/objective_c_generator.o: 
 $(OBJDIR)/$(CONFIG)/src/compiler/python_generator.o: 
 $(OBJDIR)/$(CONFIG)/src/compiler/ruby_generator.o: 
 
 
+LIBINTEROP_CLIENT_LIB_SRC = \
+    $(GENDIR)/test/cpp/interop/empty.pb.cc $(GENDIR)/test/cpp/interop/empty.grpc.pb.cc \
+    $(GENDIR)/test/cpp/interop/messages.pb.cc $(GENDIR)/test/cpp/interop/messages.grpc.pb.cc \
+    $(GENDIR)/test/cpp/interop/test.pb.cc $(GENDIR)/test/cpp/interop/test.grpc.pb.cc \
+    test/cpp/interop/client_helper.cc \
+    test/cpp/interop/interop_client.cc \
+
+
+LIBINTEROP_CLIENT_LIB_OBJS = $(addprefix $(OBJDIR)/$(CONFIG)/, $(addsuffix .o, $(basename $(LIBINTEROP_CLIENT_LIB_SRC))))
+
+ifeq ($(NO_SECURE),true)
+
+# You can't build secure libraries if you don't have OpenSSL with ALPN.
+
+$(LIBDIR)/$(CONFIG)/libinterop_client_lib.a: openssl_dep_error
+
+
+else
+
+ifeq ($(NO_PROTOBUF),true)
+
+# You can't build a C++ library if you don't have protobuf - a bit overreached, but still okay.
+
+$(LIBDIR)/$(CONFIG)/libinterop_client_lib.a: protobuf_dep_error
+
+
+else
+
+ifneq ($(OPENSSL_DEP),)
+# This is to ensure the embedded OpenSSL is built beforehand, properly
+# installing headers to their final destination on the drive. We need this
+# otherwise parallel compilation will fail if a source is compiled first.
+test/cpp/interop/empty.proto: $(OPENSSL_DEP)
+test/cpp/interop/messages.proto: $(OPENSSL_DEP)
+test/cpp/interop/test.proto: $(OPENSSL_DEP)
+test/cpp/interop/client_helper.cc: $(OPENSSL_DEP)
+test/cpp/interop/interop_client.cc: $(OPENSSL_DEP)
+endif
+
+$(LIBDIR)/$(CONFIG)/libinterop_client_lib.a: $(ZLIB_DEP) $(OPENSSL_DEP) $(PROTOBUF_DEP) $(LIBINTEROP_CLIENT_LIB_OBJS)
+	$(E) "[AR]      Creating $@"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) rm -f $(LIBDIR)/$(CONFIG)/libinterop_client_lib.a
+	$(Q) $(AR) rcs $(LIBDIR)/$(CONFIG)/libinterop_client_lib.a $(LIBINTEROP_CLIENT_LIB_OBJS)
+ifeq ($(SYSTEM),Darwin)
+	$(Q) ranlib $(LIBDIR)/$(CONFIG)/libinterop_client_lib.a
+endif
+
+
+
+
+endif
+
+endif
+
+ifneq ($(NO_SECURE),true)
+ifneq ($(NO_DEPS),true)
+-include $(LIBINTEROP_CLIENT_LIB_OBJS:.o=.dep)
+endif
+endif
+
+
+
+
+$(OBJDIR)/$(CONFIG)/test/cpp/interop/client_helper.o:     $(GENDIR)/test/cpp/interop/empty.pb.cc $(GENDIR)/test/cpp/interop/empty.grpc.pb.cc    $(GENDIR)/test/cpp/interop/messages.pb.cc $(GENDIR)/test/cpp/interop/messages.grpc.pb.cc    $(GENDIR)/test/cpp/interop/test.pb.cc $(GENDIR)/test/cpp/interop/test.grpc.pb.cc
+$(OBJDIR)/$(CONFIG)/test/cpp/interop/interop_client.o:     $(GENDIR)/test/cpp/interop/empty.pb.cc $(GENDIR)/test/cpp/interop/empty.grpc.pb.cc    $(GENDIR)/test/cpp/interop/messages.pb.cc $(GENDIR)/test/cpp/interop/messages.grpc.pb.cc    $(GENDIR)/test/cpp/interop/test.pb.cc $(GENDIR)/test/cpp/interop/test.grpc.pb.cc
+
+
+LIBINTEROP_SERVER_LIB_SRC = \
+    test/cpp/interop/server_helper.cc \
+
+
+LIBINTEROP_SERVER_LIB_OBJS = $(addprefix $(OBJDIR)/$(CONFIG)/, $(addsuffix .o, $(basename $(LIBINTEROP_SERVER_LIB_SRC))))
+
+ifeq ($(NO_SECURE),true)
+
+# You can't build secure libraries if you don't have OpenSSL with ALPN.
+
+$(LIBDIR)/$(CONFIG)/libinterop_server_lib.a: openssl_dep_error
+
+
+else
+
+ifeq ($(NO_PROTOBUF),true)
+
+# You can't build a C++ library if you don't have protobuf - a bit overreached, but still okay.
+
+$(LIBDIR)/$(CONFIG)/libinterop_server_lib.a: protobuf_dep_error
+
+
+else
+
+ifneq ($(OPENSSL_DEP),)
+# This is to ensure the embedded OpenSSL is built beforehand, properly
+# installing headers to their final destination on the drive. We need this
+# otherwise parallel compilation will fail if a source is compiled first.
+test/cpp/interop/server_helper.cc: $(OPENSSL_DEP)
+endif
+
+$(LIBDIR)/$(CONFIG)/libinterop_server_lib.a: $(ZLIB_DEP) $(OPENSSL_DEP) $(PROTOBUF_DEP) $(LIBINTEROP_SERVER_LIB_OBJS)
+	$(E) "[AR]      Creating $@"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) rm -f $(LIBDIR)/$(CONFIG)/libinterop_server_lib.a
+	$(Q) $(AR) rcs $(LIBDIR)/$(CONFIG)/libinterop_server_lib.a $(LIBINTEROP_SERVER_LIB_OBJS)
+ifeq ($(SYSTEM),Darwin)
+	$(Q) ranlib $(LIBDIR)/$(CONFIG)/libinterop_server_lib.a
+endif
+
+
+
+
+endif
+
+endif
+
+ifneq ($(NO_SECURE),true)
+ifneq ($(NO_DEPS),true)
+-include $(LIBINTEROP_SERVER_LIB_OBJS:.o=.dep)
+endif
+endif
+
+$(OBJDIR)/$(CONFIG)/test/cpp/interop/server_helper.o: 
+
+
 LIBPUBSUB_CLIENT_LIB_SRC = \
-    $(GENDIR)/examples/pubsub/label.pb.cc \
-    $(GENDIR)/examples/pubsub/empty.pb.cc \
-    $(GENDIR)/examples/pubsub/pubsub.pb.cc \
+    $(GENDIR)/examples/pubsub/label.pb.cc $(GENDIR)/examples/pubsub/label.grpc.pb.cc \
+    $(GENDIR)/examples/pubsub/empty.pb.cc $(GENDIR)/examples/pubsub/empty.grpc.pb.cc \
+    $(GENDIR)/examples/pubsub/pubsub.pb.cc $(GENDIR)/examples/pubsub/pubsub.grpc.pb.cc \
     examples/pubsub/publisher.cc \
     examples/pubsub/subscriber.cc \
 
@@ -3723,13 +3939,14 @@ endif
 
 
 
-$(OBJDIR)/$(CONFIG)/examples/pubsub/publisher.o:     $(GENDIR)/examples/pubsub/label.pb.cc    $(GENDIR)/examples/pubsub/empty.pb.cc    $(GENDIR)/examples/pubsub/pubsub.pb.cc
-$(OBJDIR)/$(CONFIG)/examples/pubsub/subscriber.o:     $(GENDIR)/examples/pubsub/label.pb.cc    $(GENDIR)/examples/pubsub/empty.pb.cc    $(GENDIR)/examples/pubsub/pubsub.pb.cc
+$(OBJDIR)/$(CONFIG)/examples/pubsub/publisher.o:     $(GENDIR)/examples/pubsub/label.pb.cc $(GENDIR)/examples/pubsub/label.grpc.pb.cc    $(GENDIR)/examples/pubsub/empty.pb.cc $(GENDIR)/examples/pubsub/empty.grpc.pb.cc    $(GENDIR)/examples/pubsub/pubsub.pb.cc $(GENDIR)/examples/pubsub/pubsub.grpc.pb.cc
+$(OBJDIR)/$(CONFIG)/examples/pubsub/subscriber.o:     $(GENDIR)/examples/pubsub/label.pb.cc $(GENDIR)/examples/pubsub/label.grpc.pb.cc    $(GENDIR)/examples/pubsub/empty.pb.cc $(GENDIR)/examples/pubsub/empty.grpc.pb.cc    $(GENDIR)/examples/pubsub/pubsub.pb.cc $(GENDIR)/examples/pubsub/pubsub.grpc.pb.cc
 
 
 LIBQPS_SRC = \
-    $(GENDIR)/test/cpp/qps/qpstest.pb.cc \
+    $(GENDIR)/test/cpp/qps/qpstest.pb.cc $(GENDIR)/test/cpp/qps/qpstest.grpc.pb.cc \
     test/cpp/qps/driver.cc \
+    test/cpp/qps/report.cc \
     test/cpp/qps/timer.cc \
 
 
@@ -3759,6 +3976,7 @@ ifneq ($(OPENSSL_DEP),)
 # otherwise parallel compilation will fail if a source is compiled first.
 test/cpp/qps/qpstest.proto: $(OPENSSL_DEP)
 test/cpp/qps/driver.cc: $(OPENSSL_DEP)
+test/cpp/qps/report.cc: $(OPENSSL_DEP)
 test/cpp/qps/timer.cc: $(OPENSSL_DEP)
 endif
 
@@ -3785,8 +4003,9 @@ endif
 endif
 
 
-$(OBJDIR)/$(CONFIG)/test/cpp/qps/driver.o:     $(GENDIR)/test/cpp/qps/qpstest.pb.cc
-$(OBJDIR)/$(CONFIG)/test/cpp/qps/timer.o:     $(GENDIR)/test/cpp/qps/qpstest.pb.cc
+$(OBJDIR)/$(CONFIG)/test/cpp/qps/driver.o:     $(GENDIR)/test/cpp/qps/qpstest.pb.cc $(GENDIR)/test/cpp/qps/qpstest.grpc.pb.cc
+$(OBJDIR)/$(CONFIG)/test/cpp/qps/report.o:     $(GENDIR)/test/cpp/qps/qpstest.pb.cc $(GENDIR)/test/cpp/qps/qpstest.grpc.pb.cc
+$(OBJDIR)/$(CONFIG)/test/cpp/qps/timer.o:     $(GENDIR)/test/cpp/qps/qpstest.pb.cc $(GENDIR)/test/cpp/qps/qpstest.grpc.pb.cc
 
 
 LIBGRPC_CSHARP_EXT_SRC = \
@@ -3838,7 +4057,7 @@ $(LIBDIR)/$(CONFIG)/libgrpc_csharp_ext.$(SHARED_EXT): $(LIBGRPC_CSHARP_EXT_OBJS)
 	$(E) "[LD]      Linking $@"
 	$(Q) mkdir -p `dirname $@`
 ifeq ($(SYSTEM),Darwin)
-	$(Q) $(LD) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -dynamiclib -o $(LIBDIR)/$(CONFIG)/libgrpc_csharp_ext.$(SHARED_EXT) $(LIBGRPC_CSHARP_EXT_OBJS) $(LDLIBS) -lgpr -lgrpc
+	$(Q) $(LD) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -install_name libgrpc_csharp_ext.$(SHARED_EXT) -dynamiclib -o $(LIBDIR)/$(CONFIG)/libgrpc_csharp_ext.$(SHARED_EXT) $(LIBGRPC_CSHARP_EXT_OBJS) $(LDLIBS) -lgpr -lgrpc
 else
 	$(Q) $(LD) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,-soname,libgrpc_csharp_ext.so.0 -o $(LIBDIR)/$(CONFIG)/libgrpc_csharp_ext.$(SHARED_EXT) $(LIBGRPC_CSHARP_EXT_OBJS) $(LDLIBS) -lgpr -lgrpc
 	$(Q) ln -sf libgrpc_csharp_ext.$(SHARED_EXT) $(LIBDIR)/$(CONFIG)/libgrpc_csharp_ext.so.0
@@ -6762,6 +6981,37 @@ endif
 endif
 
 
+GPR_TLS_TEST_SRC = \
+    test/core/support/tls_test.c \
+
+GPR_TLS_TEST_OBJS = $(addprefix $(OBJDIR)/$(CONFIG)/, $(addsuffix .o, $(basename $(GPR_TLS_TEST_SRC))))
+
+ifeq ($(NO_SECURE),true)
+
+# You can't build secure targets if you don't have OpenSSL with ALPN.
+
+$(BINDIR)/$(CONFIG)/gpr_tls_test: openssl_dep_error
+
+else
+
+$(BINDIR)/$(CONFIG)/gpr_tls_test: $(GPR_TLS_TEST_OBJS) $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+	$(E) "[LD]      Linking $@"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(LD) $(LDFLAGS) $(GPR_TLS_TEST_OBJS) $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a $(LDLIBS) $(LDLIBS_SECURE) -o $(BINDIR)/$(CONFIG)/gpr_tls_test
+
+endif
+
+$(OBJDIR)/$(CONFIG)/test/core/support/tls_test.o:  $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+
+deps_gpr_tls_test: $(GPR_TLS_TEST_OBJS:.o=.dep)
+
+ifneq ($(NO_SECURE),true)
+ifneq ($(NO_DEPS),true)
+-include $(GPR_TLS_TEST_OBJS:.o=.dep)
+endif
+endif
+
+
 GPR_USEFUL_TEST_SRC = \
     test/core/support/useful_test.c \
 
@@ -8337,6 +8587,36 @@ ifneq ($(NO_DEPS),true)
 endif
 
 
+GRPC_OBJECTIVE_C_PLUGIN_SRC = \
+    src/compiler/objective_c_plugin.cc \
+
+GRPC_OBJECTIVE_C_PLUGIN_OBJS = $(addprefix $(OBJDIR)/$(CONFIG)/, $(addsuffix .o, $(basename $(GRPC_OBJECTIVE_C_PLUGIN_SRC))))
+
+
+ifeq ($(NO_PROTOBUF),true)
+
+# You can't build the protoc plugins or protobuf-enabled targets if you don't have protobuf 3.0.0+.
+
+$(BINDIR)/$(CONFIG)/grpc_objective_c_plugin: protobuf_dep_error
+
+else
+
+$(BINDIR)/$(CONFIG)/grpc_objective_c_plugin: $(PROTOBUF_DEP) $(GRPC_OBJECTIVE_C_PLUGIN_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc_plugin_support.a
+	$(E) "[HOSTLD]  Linking $@"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(HOST_LDXX) $(HOST_LDFLAGS) $(GRPC_OBJECTIVE_C_PLUGIN_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc_plugin_support.a $(HOST_LDLIBSXX) $(HOST_LDLIBS_PROTOC) $(HOST_LDLIBS) $(HOST_LDLIBS_PROTOC) -o $(BINDIR)/$(CONFIG)/grpc_objective_c_plugin
+
+endif
+
+$(OBJDIR)/$(CONFIG)/src/compiler/objective_c_plugin.o:  $(LIBDIR)/$(CONFIG)/libgrpc_plugin_support.a
+
+deps_grpc_objective_c_plugin: $(GRPC_OBJECTIVE_C_PLUGIN_OBJS:.o=.dep)
+
+ifneq ($(NO_DEPS),true)
+-include $(GRPC_OBJECTIVE_C_PLUGIN_OBJS:.o=.dep)
+endif
+
+
 GRPC_PYTHON_PLUGIN_SRC = \
     src/compiler/python_plugin.cc \
 
@@ -8398,9 +8678,6 @@ endif
 
 
 INTEROP_CLIENT_SRC = \
-    $(GENDIR)/test/cpp/interop/empty.pb.cc \
-    $(GENDIR)/test/cpp/interop/messages.pb.cc \
-    $(GENDIR)/test/cpp/interop/test.pb.cc \
     test/cpp/interop/client.cc \
 
 INTEROP_CLIENT_OBJS = $(addprefix $(OBJDIR)/$(CONFIG)/, $(addsuffix .o, $(basename $(INTEROP_CLIENT_SRC))))
@@ -8422,19 +8699,16 @@ $(BINDIR)/$(CONFIG)/interop_client: protobuf_dep_error
 
 else
 
-$(BINDIR)/$(CONFIG)/interop_client: $(PROTOBUF_DEP) $(INTEROP_CLIENT_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+$(BINDIR)/$(CONFIG)/interop_client: $(PROTOBUF_DEP) $(INTEROP_CLIENT_OBJS) $(LIBDIR)/$(CONFIG)/libinterop_client_lib.a $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
 	$(E) "[LD]      Linking $@"
 	$(Q) mkdir -p `dirname $@`
-	$(Q) $(LDXX) $(LDFLAGS) $(INTEROP_CLIENT_OBJS) $(GTEST_LIB) $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a $(LDLIBSXX) $(LDLIBS_PROTOBUF) $(LDLIBS) $(LDLIBS_SECURE) -o $(BINDIR)/$(CONFIG)/interop_client
+	$(Q) $(LDXX) $(LDFLAGS) $(INTEROP_CLIENT_OBJS) $(GTEST_LIB) $(LIBDIR)/$(CONFIG)/libinterop_client_lib.a $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a $(LDLIBSXX) $(LDLIBS_PROTOBUF) $(LDLIBS) $(LDLIBS_SECURE) -o $(BINDIR)/$(CONFIG)/interop_client
 
 endif
 
 endif
 
-$(OBJDIR)/$(CONFIG)/test/cpp/interop/empty.o:  $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
-$(OBJDIR)/$(CONFIG)/test/cpp/interop/messages.o:  $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
-$(OBJDIR)/$(CONFIG)/test/cpp/interop/test.o:  $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
-$(OBJDIR)/$(CONFIG)/test/cpp/interop/client.o:  $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+$(OBJDIR)/$(CONFIG)/test/cpp/interop/client.o:  $(LIBDIR)/$(CONFIG)/libinterop_client_lib.a $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
 
 deps_interop_client: $(INTEROP_CLIENT_OBJS:.o=.dep)
 
@@ -8446,9 +8720,9 @@ endif
 
 
 INTEROP_SERVER_SRC = \
-    $(GENDIR)/test/cpp/interop/empty.pb.cc \
-    $(GENDIR)/test/cpp/interop/messages.pb.cc \
-    $(GENDIR)/test/cpp/interop/test.pb.cc \
+    $(GENDIR)/test/cpp/interop/empty.pb.cc $(GENDIR)/test/cpp/interop/empty.grpc.pb.cc \
+    $(GENDIR)/test/cpp/interop/messages.pb.cc $(GENDIR)/test/cpp/interop/messages.grpc.pb.cc \
+    $(GENDIR)/test/cpp/interop/test.pb.cc $(GENDIR)/test/cpp/interop/test.grpc.pb.cc \
     test/cpp/interop/server.cc \
 
 INTEROP_SERVER_OBJS = $(addprefix $(OBJDIR)/$(CONFIG)/, $(addsuffix .o, $(basename $(INTEROP_SERVER_SRC))))
@@ -8470,19 +8744,19 @@ $(BINDIR)/$(CONFIG)/interop_server: protobuf_dep_error
 
 else
 
-$(BINDIR)/$(CONFIG)/interop_server: $(PROTOBUF_DEP) $(INTEROP_SERVER_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+$(BINDIR)/$(CONFIG)/interop_server: $(PROTOBUF_DEP) $(INTEROP_SERVER_OBJS) $(LIBDIR)/$(CONFIG)/libinterop_server_lib.a $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
 	$(E) "[LD]      Linking $@"
 	$(Q) mkdir -p `dirname $@`
-	$(Q) $(LDXX) $(LDFLAGS) $(INTEROP_SERVER_OBJS) $(GTEST_LIB) $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a $(LDLIBSXX) $(LDLIBS_PROTOBUF) $(LDLIBS) $(LDLIBS_SECURE) -o $(BINDIR)/$(CONFIG)/interop_server
+	$(Q) $(LDXX) $(LDFLAGS) $(INTEROP_SERVER_OBJS) $(GTEST_LIB) $(LIBDIR)/$(CONFIG)/libinterop_server_lib.a $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a $(LDLIBSXX) $(LDLIBS_PROTOBUF) $(LDLIBS) $(LDLIBS_SECURE) -o $(BINDIR)/$(CONFIG)/interop_server
 
 endif
 
 endif
 
-$(OBJDIR)/$(CONFIG)/test/cpp/interop/empty.o:  $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
-$(OBJDIR)/$(CONFIG)/test/cpp/interop/messages.o:  $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
-$(OBJDIR)/$(CONFIG)/test/cpp/interop/test.o:  $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
-$(OBJDIR)/$(CONFIG)/test/cpp/interop/server.o:  $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+$(OBJDIR)/$(CONFIG)/test/cpp/interop/empty.o:  $(LIBDIR)/$(CONFIG)/libinterop_server_lib.a $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+$(OBJDIR)/$(CONFIG)/test/cpp/interop/messages.o:  $(LIBDIR)/$(CONFIG)/libinterop_server_lib.a $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+$(OBJDIR)/$(CONFIG)/test/cpp/interop/test.o:  $(LIBDIR)/$(CONFIG)/libinterop_server_lib.a $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+$(OBJDIR)/$(CONFIG)/test/cpp/interop/server.o:  $(LIBDIR)/$(CONFIG)/libinterop_server_lib.a $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
 
 deps_interop_server: $(INTEROP_SERVER_OBJS:.o=.dep)
 
@@ -8703,6 +8977,48 @@ endif
 endif
 
 
+QPS_SMOKE_TEST_SRC = \
+    test/cpp/qps/smoke_test.cc \
+
+QPS_SMOKE_TEST_OBJS = $(addprefix $(OBJDIR)/$(CONFIG)/, $(addsuffix .o, $(basename $(QPS_SMOKE_TEST_SRC))))
+
+ifeq ($(NO_SECURE),true)
+
+# You can't build secure targets if you don't have OpenSSL with ALPN.
+
+$(BINDIR)/$(CONFIG)/qps_smoke_test: openssl_dep_error
+
+else
+
+
+ifeq ($(NO_PROTOBUF),true)
+
+# You can't build the protoc plugins or protobuf-enabled targets if you don't have protobuf 3.0.0+.
+
+$(BINDIR)/$(CONFIG)/qps_smoke_test: protobuf_dep_error
+
+else
+
+$(BINDIR)/$(CONFIG)/qps_smoke_test: $(PROTOBUF_DEP) $(QPS_SMOKE_TEST_OBJS) $(LIBDIR)/$(CONFIG)/libqps.a $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+	$(E) "[LD]      Linking $@"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(LDXX) $(LDFLAGS) $(QPS_SMOKE_TEST_OBJS) $(GTEST_LIB) $(LIBDIR)/$(CONFIG)/libqps.a $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a $(LDLIBSXX) $(LDLIBS_PROTOBUF) $(LDLIBS) $(LDLIBS_SECURE) -o $(BINDIR)/$(CONFIG)/qps_smoke_test
+
+endif
+
+endif
+
+$(OBJDIR)/$(CONFIG)/test/cpp/qps/smoke_test.o:  $(LIBDIR)/$(CONFIG)/libqps.a $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+
+deps_qps_smoke_test: $(QPS_SMOKE_TEST_OBJS:.o=.dep)
+
+ifneq ($(NO_SECURE),true)
+ifneq ($(NO_DEPS),true)
+-include $(QPS_SMOKE_TEST_OBJS:.o=.dep)
+endif
+endif
+
+
 QPS_WORKER_SRC = \
     test/cpp/qps/client_async.cc \
     test/cpp/qps/client_sync.cc \
diff --git a/README.md b/README.md
index fa60b83d1620c70a49c340ee9517b8b2b2f76caa..b78745f02c4fbc831b133f23b21e7eed879b5888 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,10 @@
 
 Copyright 2015 Google Inc.
 
+#Documentation
+
+You can find more detailed documentation and examples in the [grpc-common repository](http://github.com/grpc/grpc-common).
+
 #Installation
 
 See grpc/INSTALL for installation instructions for various platforms.
@@ -25,10 +29,6 @@ of shared C core library [src/core] (src/core).
 Java source code is in [grpc-java] (http://github.com/grpc/grpc-java) repository. 
 Go source code is in [grpc-go] (http://github.com/grpc/grpc-go) repository.
 
-#Documentation
-
-You can find more detailed documentation and examples in the [grpc-common repository](http://github.com/grpc/grpc-common).
-
 #Current Status of libraries
 
 Libraries in different languages are in different state of development. We are seeking contributions for all of these libraries.
diff --git a/build.json b/build.json
index fb81e34beb383337e047076dcf4bfcebd6e496c9..3f2713925245c1a60e6e0752c4cf2cab90de7a55 100644
--- a/build.json
+++ b/build.json
@@ -3,7 +3,7 @@
     "#": "The public version number of the library.",
     "version": {
       "major": 0,
-      "minor": 5,
+      "minor": 6,
       "micro": 0,
       "build": 0
     }
@@ -29,6 +29,12 @@
         "include/grpc++/impl/rpc_method.h",
         "include/grpc++/impl/rpc_service_method.h",
         "include/grpc++/impl/service_type.h",
+        "include/grpc++/impl/sync.h",
+        "include/grpc++/impl/sync_cxx11.h",
+        "include/grpc++/impl/sync_no_cxx11.h",
+        "include/grpc++/impl/thd.h",
+        "include/grpc++/impl/thd_cxx11.h",
+        "include/grpc++/impl/thd_no_cxx11.h",
         "include/grpc++/server.h",
         "include/grpc++/server_builder.h",
         "include/grpc++/server_context.h",
@@ -298,6 +304,10 @@
         "include/grpc/support/sync_win32.h",
         "include/grpc/support/thd.h",
         "include/grpc/support/time.h",
+        "include/grpc/support/tls.h",
+        "include/grpc/support/tls_gcc.h",
+        "include/grpc/support/tls_msvc.h",
+        "include/grpc/support/tls_pthread.h",
         "include/grpc/support/useful.h"
       ],
       "headers": [
@@ -338,6 +348,7 @@
         "src/core/support/sync.c",
         "src/core/support/sync_posix.c",
         "src/core/support/sync_win32.c",
+        "src/core/support/thd.c",
         "src/core/support/thd_posix.c",
         "src/core/support/thd_win32.c",
         "src/core/support/time.c",
@@ -465,6 +476,10 @@
       "name": "grpc++",
       "build": "all",
       "language": "c++",
+      "headers": [
+        "src/cpp/client/secure_credentials.h",
+        "src/cpp/server/secure_server_credentials.h"
+      ],
       "src": [
         "src/cpp/client/secure_credentials.cc",
         "src/cpp/server/secure_server_credentials.cc"
@@ -515,6 +530,8 @@
         "src/compiler/cpp_generator.h",
         "src/compiler/cpp_generator_helpers.h",
         "src/compiler/generator_helpers.h",
+        "src/compiler/objective_c_generator.h",
+        "src/compiler/objective_c_generator_helpers.h",
         "src/compiler/python_generator.h",
         "src/compiler/ruby_generator.h",
         "src/compiler/ruby_generator_helpers-inl.h",
@@ -523,12 +540,46 @@
       ],
       "src": [
         "src/compiler/cpp_generator.cc",
+        "src/compiler/objective_c_generator.cc",
         "src/compiler/python_generator.cc",
         "src/compiler/ruby_generator.cc"
       ],
       "deps": [],
       "secure": "no"
     },
+    {
+      "name": "interop_client_lib",
+      "build": "private",
+      "language": "c++",
+      "src": [
+        "test/cpp/interop/empty.proto",
+        "test/cpp/interop/messages.proto",
+        "test/cpp/interop/test.proto",
+        "test/cpp/interop/client_helper.cc",
+        "test/cpp/interop/interop_client.cc"
+      ],
+      "deps": [
+        "grpc++_test_util",
+        "grpc_test_util",
+        "grpc++",
+        "grpc",
+        "gpr"
+      ]
+    },
+    {
+      "name": "interop_server_lib",
+      "build": "private",
+      "language": "c++",
+      "src": [
+        "test/cpp/interop/server_helper.cc"
+      ],
+      "deps": [
+        "grpc_test_util",
+        "grpc++",
+        "grpc",
+        "gpr"
+      ]
+    },
     {
       "name": "pubsub_client_lib",
       "build": "private",
@@ -552,11 +603,13 @@
       "language": "c++",
       "headers": [
         "test/cpp/qps/driver.h",
+        "test/cpp/qps/report.h",
         "test/cpp/qps/timer.h"
       ],
       "src": [
         "test/cpp/qps/qpstest.proto",
         "test/cpp/qps/driver.cc",
+        "test/cpp/qps/report.cc",
         "test/cpp/qps/timer.cc"
       ]
     },
@@ -1145,6 +1198,18 @@
         "gpr"
       ]
     },
+    {
+      "name": "gpr_tls_test",
+      "build": "test",
+      "language": "c",
+      "src": [
+        "test/core/support/tls_test.c"
+      ],
+      "deps": [
+        "gpr_test_util",
+        "gpr"
+      ]
+    },
     {
       "name": "gpr_useful_test",
       "build": "test",
@@ -1821,6 +1886,18 @@
       ],
       "secure": "no"
     },
+    {
+      "name": "grpc_objective_c_plugin",
+      "build": "protoc",
+      "language": "c++",
+      "src": [
+        "src/compiler/objective_c_plugin.cc"
+      ],
+      "deps": [
+        "grpc_plugin_support"
+      ],
+      "secure": "no"
+    },
     {
       "name": "grpc_python_plugin",
       "build": "protoc",
@@ -1851,12 +1928,10 @@
       "run": false,
       "language": "c++",
       "src": [
-        "test/cpp/interop/empty.proto",
-        "test/cpp/interop/messages.proto",
-        "test/cpp/interop/test.proto",
         "test/cpp/interop/client.cc"
       ],
       "deps": [
+        "interop_client_lib",
         "grpc++_test_util",
         "grpc_test_util",
         "grpc++",
@@ -1877,6 +1952,7 @@
         "test/cpp/interop/server.cc"
       ],
       "deps": [
+        "interop_server_lib",
         "grpc++_test_util",
         "grpc_test_util",
         "grpc++",
@@ -1968,6 +2044,24 @@
         "gpr"
       ]
     },
+    {
+      "name": "qps_smoke_test",
+      "build": "test",
+      "run": false,
+      "language": "c++",
+      "src": [
+        "test/cpp/qps/smoke_test.cc"
+      ],
+      "deps": [
+        "qps",
+        "grpc++_test_util",
+        "grpc_test_util",
+        "grpc++",
+        "grpc",
+        "gpr_test_util",
+        "gpr"
+      ]
+    },
     {
       "name": "qps_worker",
       "build": "test",
diff --git a/doc/interop-test-descriptions.md b/doc/interop-test-descriptions.md
new file mode 100644
index 0000000000000000000000000000000000000000..3f5ce37e1ed7986fc0417e51ed48551df6accbe8
--- /dev/null
+++ b/doc/interop-test-descriptions.md
@@ -0,0 +1,685 @@
+Interoperability Test Case Descriptions
+=======================================
+
+Client and server use
+[test.proto](https://github.com/grpc/grpc/blob/master/test/cpp/interop/test.proto)
+and the [gRPC over HTTP/2 v2
+protocol](https://github.com/grpc/grpc-common/blob/master/PROTOCOL-HTTP2.md).
+
+Client
+------
+
+Clients implement test cases that test certain functionally. Each client is
+provided the test case it is expected to run as a command-line parameter. Names
+should be lowercase and without spaces.
+
+Clients should accept these arguments:
+* --server_host=HOSTNAME
+    * The server host to connect to. For example, "localhost" or "127.0.0.1"
+* --server_host_override=HOSTNAME
+    * The server host to claim to be connecting to, for use in TLS and HTTP/2
+      :authority header. If unspecified, the value of --server_host will be
+      used
+* --server_port=PORT
+    * The server port to connect to. For example, "8080"
+* --test_case=TESTCASE
+    * The name of the test case to execute. For example, "empty_unary"
+* --use_tls=BOOLEAN
+    * Whether to use a plaintext or encrypted connection
+* --use_test_ca=BOOLEAN
+    * Whether to replace platform root CAs with
+      [ca.pem](https://github.com/grpc/grpc/blob/master/src/core/tsi/test_creds/ca.pem)
+      as the CA root
+
+Clients must support TLS with ALPN. Clients must not disable certificate
+checking.
+
+### empty_unary
+
+This test verifies that implementations support zero-size messages. Ideally,
+client implementations would verify that the request and response were zero
+bytes serialized, but this is generally prohibitive to perform, so is not
+required.
+
+Server features:
+* [EmptyCall][]
+
+Procedure:
+ 1. Client calls EmptyCall with the default Empty message
+
+Asserts:
+* call was successful
+* response is non-null
+
+*It may be possible to use UnaryCall instead of EmptyCall, but it is harder to
+ensure that the proto serialized to zero bytes.*
+
+### large_unary
+
+This test verifies unary calls succeed in sending messages, and touches on flow
+control (even if compression is enabled on the channel).
+
+Server features:
+* [UnaryCall][]
+* [Compressable Payload][]
+
+Procedure:
+ 1. Client calls UnaryCall with:
+
+    ```
+    {
+      response_type: COMPRESSABLE
+      response_size: 314159
+      payload:{
+        body: 271828 bytes of zeros
+      }
+    }
+    ```
+
+Asserts:
+* call was successful
+* response payload type is COMPRESSABLE
+* response payload body is 314159 bytes in size
+* clients are free to assert that the response payload body contents are zero
+  and comparing the entire response message against a golden response
+
+### client_streaming
+
+This test verifies that client-only streaming succeeds.
+
+Server features:
+* [StreamingInputCall][]
+* [Compressable Payload][]
+
+Procedure:
+ 1. Client calls StreamingInputCall
+ 2. Client sends:
+
+    ```
+    {
+      payload:{
+        body: 27182 bytes of zeros
+      }
+    }
+    ```
+ 3. Client then sends:
+
+    ```
+    {
+      payload:{
+        body: 8 bytes of zeros
+      }
+    }
+    ```
+ 4. Client then sends:
+
+    ```
+    {
+      payload:{
+        body: 1828 bytes of zeros
+      }
+    }
+    ```
+ 5. Client then sends:
+
+    ```
+    {
+      payload:{
+        body: 45904 bytes of zeros
+      }
+    }
+    ```
+ 6. Client halfCloses
+
+Asserts:
+* call was successful
+* response aggregated_payload_size is 74922
+
+### server_streaming
+
+This test verifies that server-only streaming succeeds.
+
+Server features:
+* [StreamingOutputCall][]
+* [Compressable Payload][]
+
+Procedure:
+ 1. Client calls StreamingOutputCall with:
+
+    ```
+    {
+      response_type:COMPRESSABLE
+      response_parameters:{
+        size: 31415
+      }
+      response_parameters:{
+        size: 9
+      }
+      response_parameters:{
+        size: 2653
+      }
+      response_parameters:{
+        size: 58979
+      }
+    }
+    ```
+
+Asserts:
+* call was successful
+* exactly four responses
+* response payloads are COMPRESSABLE
+* response payload bodies are sized (in order): 31415, 9, 2653, 58979
+* clients are free to assert that the response payload body contents are zero
+  and comparing the entire response messages against golden responses
+
+### ping_pong
+
+This test verifies that full duplex bidi is supported.
+
+Server features:
+* [FullDuplexCall][]
+* [Compressable Payload][]
+
+Procedure:
+ 1. Client calls FullDuplexCall with:
+
+    ```
+    {
+      response_type: COMPRESSABLE
+      response_parameters:{
+        size: 31415
+      }
+      payload:{
+        body: 27182 bytes of zeros
+      }
+    }
+    ```
+ 2. After getting a reply, it sends:
+
+    ```
+    {
+      response_type: COMPRESSABLE
+      response_parameters:{
+        size: 9
+      }
+      payload:{
+        body: 8 bytes of zeros
+      }
+    }
+    ```
+ 3. After getting a reply, it sends:
+
+    ```
+    {
+      response_type: COMPRESSABLE
+      response_parameters:{
+        size: 2653
+      }
+      payload:{
+        body: 1828 bytes of zeros
+      }
+    }
+    ```
+ 4. After getting a reply, it sends:
+
+    ```
+    {
+      response_type: COMPRESSABLE
+      response_parameters:{
+        size: 58979
+      }
+      payload:{
+        body: 45904 bytes of zeros
+      }
+    }
+    ```
+
+Asserts:
+* call was successful
+* exactly four responses
+* response payloads are COMPRESSABLE
+* response payload bodies are sized (in order): 31415, 9, 2653, 58979
+* clients are free to assert that the response payload body contents are zero
+  and comparing the entire response messages against golden responses
+
+### empty_stream
+
+This test verifies that streams support having zero-messages in both
+directions.
+
+Server features:
+* [FullDuplexCall][]
+
+Procedure:
+ 1. Client calls FullDuplexCall and then half-closes
+
+Asserts:
+* call was successful
+* exactly zero responses
+
+### compute_engine_creds
+
+Status: Not yet implementable
+
+This test is only for cloud-to-prod path.
+
+This test verifies unary calls succeed in sending messages while using Service
+Credentials from GCE metadata server. The client instance needs to be created
+with desired oauth scope.
+
+Server features:
+* [UnaryCall][]
+* [Compressable Payload][]
+* SimpeResponse.username
+* SimpleResponse.oauth_scope
+
+Procedure:
+ 1. Client sets flags default_service_account with GCE service account name and
+    oauth_scope with the oauth scope to use.
+ 2. Client configures channel to use GCECredentials
+ 3. Client calls UnaryCall on the channel with:
+
+    ```
+    {
+      response_type: COMPRESSABLE
+      response_size: 314159
+      payload:{
+        body: 271828 bytes of zeros
+      }
+      fill_username: true
+      fill_oauth_scope: true
+    }
+    ```
+
+Asserts:
+* call was successful
+* received SimpleResponse.username equals FLAGS_default_service_account
+* received SimpleResponse.oauth_scope is in FLAGS_oauth_scope
+* response payload body is 314159 bytes in size
+* clients are free to assert that the response payload body contents are zero
+  and comparing the entire response message against a golden response
+
+### service_account_creds
+
+Status: Not yet implementable
+
+This test is only for cloud-to-prod path.
+
+This test verifies unary calls succeed in sending messages while using JWT
+signing keys (redeemed for OAuth2 access tokens by the auth implementation)
+
+Server features:
+* [UnaryCall][]
+* [Compressable Payload][]
+* SimpleResponse.username
+* SimpleResponse.oauth_scope
+
+Procedure:
+ 1. Client sets flags service_account_key_file with the path to json key file,
+    oauth_scope to the oauth scope.
+ 2. Client configures the channel to use ServiceAccountCredentials.
+ 3. Client calls UnaryCall with:
+
+    ```
+    {
+      response_type: COMPRESSABLE
+      response_size: 314159
+      payload:{
+        body: 271828 bytes of zeros
+      }
+      fill_username: true
+      fill_oauth_scope: true
+    }
+    ```
+
+Asserts:
+* call was successful
+* received SimpleResponse.username is in the json key file read from
+  FLAGS_service_account_key_file
+* received SimpleResponse.oauth_scope is in FLAGS_oauth_scope
+* response payload body is 314159 bytes in size
+* clients are free to assert that the response payload body contents are zero
+  and comparing the entire response message against a golden response
+
+### jwt_token_creds
+
+Status: Not yet implementable
+
+This test is only for cloud-to-prod path.
+
+This test verifies unary calls succeed in sending messages while using JWT
+token (created by the project's key file)
+
+Server features:
+* [UnaryCall][]
+* [Compressable Payload][]
+* SimpleResponse.username
+* SimpleResponse.oauth_scope
+
+Procedure:
+ 1. Client sets flags service_account_key_file with the path to json key file
+ 2. Client configures the channel to use JWTTokenCredentials.
+ 3. Client calls UnaryCall with:
+
+    ```
+    {
+      response_type: COMPRESSABLE
+      response_size: 314159
+      payload:{
+        body: 271828 bytes of zeros
+      }
+      fill_username: true
+    }
+    ```
+
+Asserts:
+* call was successful
+* received SimpleResponse.username is in the json key file read from
+  FLAGS_service_account_key_file
+* response payload body is 314159 bytes in size
+* clients are free to assert that the response payload body contents are zero
+  and comparing the entire response message against a golden response
+
+### Metadata (TODO: fix name)
+
+Status: Not yet implementable
+
+This test verifies that custom metadata in either binary or ascii format can be
+sent in header and trailer.
+
+Server features:
+* [UnaryCall][]
+* [Compressable Payload][]
+* Ability to receive custom metadata from client in header and send custom data
+  back to client in both header and trailer. (TODO: this is not defined)
+
+Procedure:
+ 1. While sending custom metadata (ascii + binary) in the header, client calls UnaryCall with:
+
+    ```
+    {
+      response_type: COMPRESSABLE
+      response_size: 314159
+      payload:{
+        body: 271828 bytes of zeros
+      }
+    }
+    ```
+
+Asserts:
+* call was successful
+* custom metadata is echoed back in the response header.
+* custom metadata is echoed back in the response trailer.
+
+### status_code_and_message
+
+Status: Not yet implementable
+
+This test verifies unary calls succeed in sending messages, and propagates back
+status code and message sent along with the messages.
+
+Server features:
+* [UnaryCall][]
+
+Procedure:
+ 1. Client calls UnaryCall with:
+
+    ```
+    {
+      response_status:{
+        code: 2
+        message: "test status message"
+      }
+    }
+    ```
+
+Asserts:
+* received status code is the same with sent code
+* received status message is the same with sent message
+
+### unimplemented_method
+
+Status: Not yet implementable
+
+This test verifies calling unimplemented RPC method returns unimplemented
+status.
+
+Procedure:
+* Client calls UnimplementedCall with:
+
+    ```
+    {
+      response_type: COMPRESSABLE
+      response_size: 314159
+      payload:{
+        body: 271828 bytes of zeros
+      }
+    }
+    ```
+
+Asserts:
+* received status code is 12 (UNIMPLEMENTED)
+* received status message is empty or null/unset
+
+### cancel_after_begin
+
+This test verifies that a request can be cancelled after metadata has been sent
+but before payloads are sent.
+
+Server features:
+* [StreamingInputCall][]
+
+Procedure:
+ 1. Client starts StreamingInputCall
+ 2. Client immediately cancels request
+
+Asserts:
+* Call completed with status CANCELLED
+
+### cancel_after_first_response
+
+This test verifies that a request can be cancelled after receiving a message
+from the server.
+
+Server features:
+* [FullDuplexCall][]
+* [Compressable Payload][]
+
+Procedure:
+ 1. Client starts FullDuplexCall with
+
+    ```
+    {
+      response_type: COMPRESSABLE
+      response_parameters:{
+        size: 31415
+      }
+      payload:{
+        body: 27182 bytes of zeros
+      }
+    }
+    ```
+ 2. After receiving a response, client cancels request
+
+Asserts:
+* Call completed with status CANCELLED
+
+### concurrent_large_unary
+
+Status: TODO
+
+Client performs 1000 large_unary tests in parallel on the same channel.
+
+### Flow control. Pushback at client for large messages (TODO: fix name)
+
+Status: TODO
+
+This test verifies that a client sending faster than a server can drain sees
+pushback (i.e., attempts to send succeed only after appropriate delays).
+
+### TODO Tests
+
+High priority:
+
+Propagation of status code and message (yangg)
+
+Cancel after sent headers (ctiller - done)
+
+Cancel after received first message (ctiller - done)
+
+Timeout after expire (zhaoq)
+
+Zero-message streams (ejona)
+
+Multiple thousand simultaneous calls on same Channel (ctiller - done)
+
+OAuth2 tokens + Service Credentials from GCE metadata server (GCE->prod only)
+(abhishek)
+
+OAuth2 tokens + JWT signing key (GCE->prod only) (abhishek)
+
+Metadata: client headers, server headers + trailers, binary+ascii (chenw)
+
+Normal priority:
+
+Cancel before start (ctiller)
+
+Cancel after sent first message (ctiller)
+
+Cancel after received headers (ctiller)
+
+Timeout but completed before expire (zhaoq)
+
+Multiple thousand simultaneous calls timeout on same Channel (ctiller)
+
+Lower priority:
+
+Flow control. Pushback at client for large messages (abhishek)
+
+Flow control. Pushback at server for large messages (abhishek)
+
+Going over max concurrent streams doesn't fail (client controls itself)
+(abhishek)
+
+RPC method not implemented (yangg)
+
+Multiple thousand simultaneous calls on different Channels (ctiller)
+
+Failed TLS hostname verification (ejona?)
+
+To priorize:
+
+Start streaming RPC but don't send any requests, server responds
+
+### Postponed Tests
+
+Resilience to buggy servers: These tests would verify that a client application
+isn't affected negatively by the responses put on the wire by a buggy server
+(e.g. the client library won't make the application crash).
+
+Reconnect after transport failure
+
+Reconnect backoff
+
+Fuzz testing
+
+
+Server
+------
+
+Servers implement various named features for clients to test with. Server
+features are orthogonal. If a server implements a feature, it is always
+available for clients. Names are simple descriptions for developer
+communication and tracking.
+
+Servers should accept these arguments:
+
+* --port=PORT
+
+    * The port to listen on. For example, "8080"
+
+* --use_tls=BOOLEAN
+
+    * Whether to use a plaintext or encrypted connection
+
+Servers must support TLS with ALPN. They should use
+[server1.pem](https://github.com/grpc/grpc/blob/master/src/core/tsi/test_creds/server1.pem)
+for their certificate.
+
+### EmptyCall
+[EmptyCall]: #emptycall
+
+Server implements EmptyCall which immediately returns the empty message.
+
+### UnaryCall
+[UnaryCall]: #unarycall
+
+Server implements UnaryCall which immediately returns a SimpleResponse with a
+payload body of size SimpleRequest.response_size bytes and type as appropriate
+for the SimpleRequest.response_type. If the server does not support the
+response_type, then it should fail the RPC with INVALID_ARGUMENT.
+
+If the request sets fill_username, the server should return the client username
+it sees in field SimpleResponse.username. If the request sets fill_oauth_scope,
+the server should return the oauth scope of the rpc in the form of "xapi_zoo"
+in field SimpleResponse.oauth_scope.
+
+### StreamingInputCall
+[StreamingInputCall]: #streaminginputcall
+
+Server implements StreamingInputCall which upon half close immediately returns
+a StreamingInputCallResponse where aggregated_payload_size is the sum of all
+request payload bodies received.
+
+### StreamingOutputCall
+[StreamingOutputCall]: #streamingoutputcall
+
+Server implements StreamingOutputCall by replying, in order, with one
+StreamingOutputCallResponses for each ResponseParameters in
+StreamingOutputCallRequest. Each StreamingOutputCallResponses should have a
+payload body of size ResponseParameters.size bytes, as specified by its
+respective ResponseParameters. After sending all responses, it closes with OK.
+
+### FullDuplexCall
+[FullDuplexCall]: #fullduplexcall
+
+Server implements FullDuplexCall by replying, in order, with one
+StreamingOutputCallResponses for each ResponseParameters in each
+StreamingOutputCallRequest. Each StreamingOutputCallResponses should have a
+payload body of size ResponseParameters.size bytes, as specified by its
+respective ResponseParameters. After receiving half close and sending all
+responses, it closes with OK.
+
+### Compressable Payload
+[Compressable Payload]: #compressable-payload
+
+When the client requests COMPRESSABLE payload, the response includes a payload
+of the size requested containing all zeros and the payload type is
+COMPRESSABLE.
+
+### Observe ResponseParameters.interval_us
+[Observe ResponseParameters.interval_us]: #observe-responseparametersinterval_us
+
+In StreamingOutputCall and FullDuplexCall, server delays sending a
+StreamingOutputCallResponse by the ResponseParameters's interval_us for that
+particular response, relative to the last response sent. That is, interval_us
+acts like a sleep *before* sending the response and accumulates from one
+response to the next.
+
+Interaction with flow control is unspecified.
+
+### Echo Auth Information
+
+Status: Pending
+
+If a SimpleRequest has fill_username=true and that request was successfully
+authenticated, then the SimpleResponse should have username filled with the
+canonical form of the authenticated source. The canonical form is dependent on
+the authentication method, but is likely to be a base 10 integer identifier or
+an email address.
+
+Discussion:
+
+Ideally, this would be communicated via metadata and not in the
+request/response, but we want to use this test in code paths that don't yet
+fully communicate metadata.
diff --git a/examples/pubsub/publisher.h b/examples/pubsub/publisher.h
index c90406ffef8df438949482c80e5dd8fb1861a8fa..33bcf98df48a19937ed0c3e0e28dc5229abb14df 100644
--- a/examples/pubsub/publisher.h
+++ b/examples/pubsub/publisher.h
@@ -37,7 +37,7 @@
 #include <grpc++/channel_interface.h>
 #include <grpc++/status.h>
 
-#include "examples/pubsub/pubsub.pb.h"
+#include "examples/pubsub/pubsub.grpc.pb.h"
 
 namespace grpc {
 namespace examples {
diff --git a/examples/pubsub/subscriber.h b/examples/pubsub/subscriber.h
index c587c01b8256f2163977fff29e49602e10e0e2eb..40ab45471d5e7ada2b115d869f993f121ea7dfa1 100644
--- a/examples/pubsub/subscriber.h
+++ b/examples/pubsub/subscriber.h
@@ -37,7 +37,7 @@
 #include <grpc++/channel_interface.h>
 #include <grpc++/status.h>
 
-#include "examples/pubsub/pubsub.pb.h"
+#include "examples/pubsub/pubsub.grpc.pb.h"
 
 namespace grpc {
 namespace examples {
diff --git a/include/grpc++/config.h b/include/grpc++/config.h
index 8ef5d71bfac4202a1c2d38bf97e2d68e79f95083..0f3d69289f3a7aff0a1c5bb086949a42412f9dcc 100644
--- a/include/grpc++/config.h
+++ b/include/grpc++/config.h
@@ -34,11 +34,46 @@
 #ifndef GRPCXX_CONFIG_H
 #define GRPCXX_CONFIG_H
 
-#ifdef GRPC_OLD_CXX
+#if !defined(GRPC_NO_AUTODETECT_PLATFORM)
+
+#ifdef _MSC_VER
+// Visual Studio 2010 is 1600.
+#if _MSC_VER < 1600
+#error "gRPC is only supported with Visual Studio starting at 2010"
+// Visual Studio 2013 is 1800.
+#elif _MSC_VER < 1800
+#define GRPC_CXX0X_NO_FINAL 1
+#define GRPC_CXX0X_NO_OVERRIDE 1
+#define GRPC_CXX0X_NO_CHRONO 1
+#define GRPC_CXX0X_NO_THREAD 1
+#endif  
+#endif  // Visual Studio
+
+#ifndef __clang__
+#ifdef __GNUC__
+// nullptr was added in gcc 4.6
+#if (__GNUC__ * 100 + __GNUC_MINOR__ < 406)
+#define GRPC_CXX0X_NO_NULLPTR 1
+#endif
+// final and override were added in gcc 4.7
+#if (__GNUC__ * 100 + __GNUC_MINOR__ < 407)
+#define GRPC_CXX0X_NO_FINAL 1
+#define GRPC_CXX0X_NO_OVERRIDE 1
+#endif
+#endif
+#endif
+
+#endif
+
+#ifdef GRPC_CXX0X_NO_FINAL
 #define GRPC_FINAL
-#define GRPC_OVERRIDE
 #else
 #define GRPC_FINAL final
+#endif
+
+#ifdef GRPC_CXX0X_NO_OVERRIDE
+#define GRPC_OVERRIDE
+#else
 #define GRPC_OVERRIDE override
 #endif
 
@@ -65,15 +100,7 @@
   ::google::protobuf::io::ZeroCopyInputStream
 #endif
 
-#ifndef __clang__
-#ifdef __GNUC__
-#if (__GNUC__ * 100 + __GNUC_MINOR__ < 406)
-#define GRPC_NO_NULLPTR
-#endif
-#endif
-#endif
-
-#ifdef GRPC_NO_NULLPTR
+#ifdef GRPC_CXX0X_NO_NULLPTR
 #include <memory>
 const class {
 public:
diff --git a/include/grpc++/impl/sync.h b/include/grpc++/impl/sync.h
new file mode 100644
index 0000000000000000000000000000000000000000..2f41d2bdebb8b73c0fa3137ceaf650370393bead
--- /dev/null
+++ b/include/grpc++/impl/sync.h
@@ -0,0 +1,45 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPCXX_IMPL_SYNC_H
+#define GRPCXX_IMPL_SYNC_H
+
+#include <grpc++/config.h>
+
+#ifdef GRPC_CXX0X_NO_THREAD
+#include <grpc++/impl/sync_no_cxx11.h>
+#else
+#include <grpc++/impl/sync_cxx11.h>
+#endif
+
+#endif  // GRPCXX_IMPL_SYNC_H
diff --git a/include/grpc++/impl/sync_cxx11.h b/include/grpc++/impl/sync_cxx11.h
new file mode 100644
index 0000000000000000000000000000000000000000..4e6f1da3a61f6053c9028e74e7d34d5cf3175e00
--- /dev/null
+++ b/include/grpc++/impl/sync_cxx11.h
@@ -0,0 +1,49 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPCXX_IMPL_SYNC_CXX11_H
+#define GRPCXX_IMPL_SYNC_CXX11_H
+
+#include <condition_variable>
+#include <mutex>
+
+namespace grpc {
+
+using std::condition_variable;
+using std::mutex;
+using std::lock_guard;
+using std::unique_lock;
+
+}  // namespace grpc
+
+#endif  // GRPCXX_IMPL_SYNC_CXX11_H
diff --git a/include/grpc++/impl/sync_no_cxx11.h b/include/grpc++/impl/sync_no_cxx11.h
new file mode 100644
index 0000000000000000000000000000000000000000..5636373b8141638204ffbb19d30c9f2a3d02fa80
--- /dev/null
+++ b/include/grpc++/impl/sync_no_cxx11.h
@@ -0,0 +1,101 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPCXX_IMPL_SYNC_NO_CXX11_H
+#define GRPCXX_IMPL_SYNC_NO_CXX11_H
+
+#include <grpc/support/sync.h>
+
+namespace grpc {
+
+template<class mutex>
+class lock_guard;
+class condition_variable;
+
+class mutex {
+ public:
+  mutex() { gpr_mu_init(&mu_); }
+  ~mutex() { gpr_mu_destroy(&mu_); }
+ private:
+  ::gpr_mu mu_;
+  template <class mutex>
+  friend class lock_guard;
+  friend class condition_variable;
+};
+
+template <class mutex>
+class lock_guard {
+ public:
+  lock_guard(mutex &mu) : mu_(mu), locked(true) { gpr_mu_lock(&mu.mu_); }
+  ~lock_guard() { unlock_internal(); }
+ protected:
+  void lock_internal() {
+    if (!locked) gpr_mu_lock(&mu_.mu_);
+    locked = true;
+  }
+  void unlock_internal() {
+    if (locked) gpr_mu_unlock(&mu_.mu_);
+    locked = false;
+  }
+ private:
+  mutex &mu_;
+  bool locked;
+  friend class condition_variable;
+};
+
+template <class mutex>
+class unique_lock : public lock_guard<mutex> {
+ public:
+  unique_lock(mutex &mu) : lock_guard(mu) { }
+  void lock() { lock_internal(); }
+  void unlock() { unlock_internal(); }
+};
+
+class condition_variable {
+ public:
+  condition_variable() { gpr_cv_init(&cv_); }
+  ~condition_variable() { gpr_cv_destroy(&cv_); }
+  void wait(lock_guard<mutex> &mu) {
+    mu.locked = false;
+    gpr_cv_wait(&cv_, &mu.mu_.mu_, gpr_inf_future);
+    mu.locked = true;
+  }
+  void notify_one() { gpr_cv_signal(&cv_); }
+  void notify_all() { gpr_cv_broadcast(&cv_); }
+ private:
+  gpr_cv cv_;
+};
+
+}  // namespace grpc
+
+#endif  // GRPCXX_IMPL_SYNC_NO_CXX11_H
diff --git a/include/grpc++/impl/thd.h b/include/grpc++/impl/thd.h
new file mode 100644
index 0000000000000000000000000000000000000000..4c4578a92da142bfaef648b4b4cb1d69aaa58add
--- /dev/null
+++ b/include/grpc++/impl/thd.h
@@ -0,0 +1,45 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPCXX_IMPL_THD_H
+#define GRPCXX_IMPL_THD_H
+
+#include <grpc++/config.h>
+
+#ifdef GRPC_CXX0X_NO_THREAD
+#include <grpc++/impl/thd_no_cxx11.h>
+#else
+#include <grpc++/impl/thd_cxx11.h>
+#endif
+
+#endif  // GRPCXX_IMPL_THD_H
diff --git a/include/grpc++/impl/thd_cxx11.h b/include/grpc++/impl/thd_cxx11.h
new file mode 100644
index 0000000000000000000000000000000000000000..2055b1d5389e28f472b8bb2c55c6da01dc55566a
--- /dev/null
+++ b/include/grpc++/impl/thd_cxx11.h
@@ -0,0 +1,45 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPCXX_IMPL_THD_CXX11_H
+#define GRPCXX_IMPL_THD_CXX11_H
+
+#include <thread>
+
+namespace grpc {
+
+using std::thread;
+
+}  // namespace grpc
+
+#endif  // GRPCXX_IMPL_THD_CXX11_H
diff --git a/include/grpc++/impl/thd_no_cxx11.h b/include/grpc++/impl/thd_no_cxx11.h
new file mode 100644
index 0000000000000000000000000000000000000000..a01b931df86f6de027ecd111c474b25ab6a5e5ad
--- /dev/null
+++ b/include/grpc++/impl/thd_no_cxx11.h
@@ -0,0 +1,89 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPCXX_IMPL_THD_NO_CXX11_H
+#define GRPCXX_IMPL_THD_NO_CXX11_H
+
+#include <grpc/support/thd.h>
+
+namespace grpc {
+
+class thread {
+ public:
+  template<class T> thread(void (T::*fptr)(), T *obj) {
+    func_ = new thread_function<T>(fptr, obj);
+    joined_ = false;
+    start();
+  }
+  ~thread() {
+    if (!joined_) std::terminate();
+    delete func_;
+  }
+  void join() {
+    gpr_thd_join(thd_);
+    joined_ = true;
+  }
+ private:
+  void start() {
+    gpr_thd_options options = gpr_thd_options_default();
+    gpr_thd_options_set_joinable(&options);
+    gpr_thd_new(&thd_, thread_func, (void *) func_, &options);
+  }
+  static void thread_func(void *arg) {
+    thread_function_base *func = (thread_function_base *) arg;
+    func->call();
+  }
+  class thread_function_base {
+   public:
+    virtual ~thread_function_base() { }
+    virtual void call() = 0;
+  };
+  template<class T>
+  class thread_function : public thread_function_base {
+   public:
+    thread_function(void (T::*fptr)(), T *obj)
+      : fptr_(fptr)
+      , obj_(obj) { }
+    virtual void call() { (obj_->*fptr_)(); }
+   private:
+    void (T::*fptr_)();
+    T *obj_;
+  };
+  thread_function_base *func_;
+  gpr_thd_id thd_;
+  bool joined_;
+};
+
+}  // namespace grpc
+
+#endif  // GRPCXX_IMPL_THD_NO_CXX11_H
diff --git a/include/grpc++/server.h b/include/grpc++/server.h
index bddb4f62aa86ef5eccaecc2dd0f0ae1d74569c6b..eb5061157357f9dfffaac0e77fab68ee41226f29 100644
--- a/include/grpc++/server.h
+++ b/include/grpc++/server.h
@@ -34,15 +34,14 @@
 #ifndef GRPCXX_SERVER_H
 #define GRPCXX_SERVER_H
 
-#include <condition_variable>
 #include <list>
 #include <memory>
-#include <mutex>
 
 #include <grpc++/completion_queue.h>
 #include <grpc++/config.h>
 #include <grpc++/impl/call.h>
 #include <grpc++/impl/service_type.h>
+#include <grpc++/impl/sync.h>
 #include <grpc++/status.h>
 
 struct grpc_server;
@@ -110,12 +109,12 @@ class Server GRPC_FINAL : private CallHook,
   CompletionQueue cq_;
 
   // Sever status
-  std::mutex mu_;
+  grpc::mutex mu_;
   bool started_;
   bool shutdown_;
   // The number of threads which are running callbacks.
   int num_running_cb_;
-  std::condition_variable callback_cv_;
+  grpc::condition_variable callback_cv_;
 
   std::list<SyncRequest> sync_methods_;
 
diff --git a/include/grpc/support/port_platform.h b/include/grpc/support/port_platform.h
index 41185dbf6401aef41c7f29cdee6d379780c13d3b..0bb3e16c8d106abb136e15a0a2ef5b0fefa12365 100644
--- a/include/grpc/support/port_platform.h
+++ b/include/grpc/support/port_platform.h
@@ -55,14 +55,17 @@
 #define GPR_WINSOCK_SOCKET 1
 #ifdef __GNUC__
 #define GPR_GCC_ATOMIC 1
+#define GPR_GCC_TLS 1
 #else
 #define GPR_WIN32_ATOMIC 1
+#define GPR_MSVC_TLS 1
 #endif
 #elif defined(ANDROID) || defined(__ANDROID__)
 #define GPR_ANDROID 1
 #define GPR_ARCH_32 1
 #define GPR_CPU_LINUX 1
 #define GPR_GCC_SYNC 1
+#define GPR_GCC_TLS 1
 #define GPR_POSIX_MULTIPOLL_WITH_POLL 1
 #define GPR_POSIX_WAKEUP_FD 1
 #define GPR_LINUX_EVENTFD 1
@@ -88,6 +91,7 @@
 #include <features.h>
 #define GPR_CPU_LINUX 1
 #define GPR_GCC_ATOMIC 1
+#define GPR_GCC_TLS 1
 #define GPR_LINUX 1
 #define GPR_LINUX_MULTIPOLL_WITH_EPOLL 1
 #define GPR_POSIX_WAKEUP_FD 1
@@ -134,6 +138,32 @@
 #define GPR_CPU_POSIX 1
 #endif
 #define GPR_GCC_ATOMIC 1
+#define GPR_GCC_TLS 1
+#define GPR_POSIX_LOG 1
+#define GPR_POSIX_MULTIPOLL_WITH_POLL 1
+#define GPR_POSIX_WAKEUP_FD 1
+#define GPR_POSIX_NO_SPECIAL_WAKEUP_FD 1
+#define GPR_POSIX_SOCKET 1
+#define GPR_POSIX_SOCKETADDR 1
+#define GPR_POSIX_SOCKETUTILS 1
+#define GPR_POSIX_ENV 1
+#define GPR_POSIX_FILE 1
+#define GPR_POSIX_STRING 1
+#define GPR_POSIX_SYNC 1
+#define GPR_POSIX_TIME 1
+#define GPR_GETPID_IN_UNISTD_H 1
+#ifdef _LP64
+#define GPR_ARCH_64 1
+#else /* _LP64 */
+#define GPR_ARCH_32 1
+#endif /* _LP64 */
+#elif defined(__FreeBSD__)
+#ifndef _BSD_SOURCE
+#define _BSD_SOURCE
+#endif
+#define GPR_CPU_POSIX 1
+#define GPR_GCC_ATOMIC 1
+#define GPR_GCC_TLS 1
 #define GPR_POSIX_LOG 1
 #define GPR_POSIX_MULTIPOLL_WITH_POLL 1
 #define GPR_POSIX_WAKEUP_FD 1
@@ -190,16 +220,20 @@
 #error Must define exactly one of GPR_ARCH_32, GPR_ARCH_64
 #endif
 
-#if defined(GPR_CPU_LINUX) + defined(GPR_CPU_POSIX) + defined(GPR_WIN32) + defined(GPR_CPU_IPHONE) != 1
-#error Must define exactly one of GPR_CPU_LINUX, GPR_CPU_POSIX, GPR_WIN32, GPR_CPU_IPHONE
+#if defined(GPR_CPU_LINUX) + defined(GPR_CPU_POSIX) + defined(GPR_WIN32) + defined(GPR_CPU_IPHONE) + defined(GPR_CPU_CUSTOM) != 1
+#error Must define exactly one of GPR_CPU_LINUX, GPR_CPU_POSIX, GPR_WIN32, GPR_CPU_IPHONE, GPR_CPU_CUSTOM
 #endif
 
 #if defined(GPR_POSIX_MULTIPOLL_WITH_POLL) && !defined(GPR_POSIX_SOCKET)
 #error Must define GPR_POSIX_SOCKET to use GPR_POSIX_MULTIPOLL_WITH_POLL
 #endif
 
-#if defined(GPR_POSIX_SOCKET) + defined(GPR_WIN32) != 1
-#error Must define exactly one of GPR_POSIX_SOCKET, GPR_WIN32
+#if defined(GPR_POSIX_SOCKET) + defined(GPR_WINSOCK_SOCKET) + defined(GPR_CUSTOM_SOCKET) != 1
+#error Must define exactly one of GPR_POSIX_SOCKET, GPR_WINSOCK_SOCKET, GPR_CUSTOM_SOCKET
+#endif
+
+#if defined(GPR_MSVC_TLS) + defined(GPR_GCC_TLS) + defined(GPR_PTHREAD_TLS) + defined(GPR_CUSTOM_TLS) != 1
+#error Must define exactly one of GPR_MSVC_TLS, GPR_GCC_TLS, GPR_PTHREAD_TLS, defined(GPR_CUSTOM_TLS)
 #endif
 
 typedef int16_t gpr_int16;
diff --git a/include/grpc/support/sync.h b/include/grpc/support/sync.h
index 35b2d12e77486f77bd3369819afb4d6f204487f5..1cdde1d2d04656c816769e724392381f9ac5fab2 100644
--- a/include/grpc/support/sync.h
+++ b/include/grpc/support/sync.h
@@ -60,7 +60,7 @@
 #include <grpc/support/sync_posix.h>
 #elif defined(GPR_WIN32)
 #include <grpc/support/sync_win32.h>
-#else
+#elif !defined(GPR_CUSTOM_SYNC)
 #error Unable to determine platform for sync
 #endif
 
diff --git a/include/grpc/support/thd.h b/include/grpc/support/thd.h
index 64d5bed49a7eab6c00f581eb2b7e2fbfb590e6d8..8126992d6b99dc5681ba69ab5eba3beaca6f5312 100644
--- a/include/grpc/support/thd.h
+++ b/include/grpc/support/thd.h
@@ -52,9 +52,8 @@ typedef gpr_uint64 gpr_thd_id;
 
 /* Thread creation options. */
 typedef struct {
-  int flags; /* Flags below can be set here.  Default value 0.  */
+  int flags; /* Opaque field. Get and set with accessors below. */
 } gpr_thd_options;
-/* No flags are currently defined. */
 
 /* Create a new thread running (*thd_body)(arg) and place its thread identifier
    in *t, and return true.  If there are insufficient resources, return false.
@@ -66,9 +65,25 @@ int gpr_thd_new(gpr_thd_id *t, void (*thd_body)(void *arg), void *arg,
 /* Return a gpr_thd_options struct with all fields set to defaults. */
 gpr_thd_options gpr_thd_options_default(void);
 
+/* Set the thread to become detached on startup - this is the default. */
+void gpr_thd_options_set_detached(gpr_thd_options *options);
+
+/* Set the thread to become joinable - mutually exclusive with detached. */
+void gpr_thd_options_set_joinable(gpr_thd_options *options);
+
+/* Returns non-zero if the option detached is set. */
+int gpr_thd_options_is_detached(const gpr_thd_options *options);
+
+/* Returns non-zero if the option joinable is set. */
+int gpr_thd_options_is_joinable(const gpr_thd_options *options);
+
 /* Returns the identifier of the current thread. */
 gpr_thd_id gpr_thd_currentid(void);
 
+/* Blocks until the specified thread properly terminates.
+   Calling this on a detached thread has unpredictable results. */
+void gpr_thd_join(gpr_thd_id t);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/include/grpc/support/tls.h b/include/grpc/support/tls.h
new file mode 100644
index 0000000000000000000000000000000000000000..1077fdec295f70003ebe27bbf80e8ef9eb42240b
--- /dev/null
+++ b/include/grpc/support/tls.h
@@ -0,0 +1,77 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPC_SUPPORT_TLS_H
+#define GRPC_SUPPORT_TLS_H
+
+#include "port_platform.h"
+
+/* Thread local storage.
+
+   A minimal wrapper that should be implementable across many compilers,
+   and implementable efficiently across most modern compilers.
+
+   Thread locals have type gpr_intptr.
+
+   Declaring a thread local variable 'foo':
+     GPR_TLS_DECL(foo, initial_value);
+   Thread locals always have static scope.
+
+   Initializing a thread local (must be done at library initialization 
+   time):
+     gpr_tls_init(&foo);
+
+   Destroying a thread local:
+     gpr_tls_destroy(&foo);
+
+   Setting a thread local:
+     gpr_tls_set(&foo, new_value);
+
+   Accessing a thread local:
+     current_value = gpr_tls_get(&foo, value); 
+
+   ALL functions here may be implemented as macros. */
+
+#ifdef GPR_GCC_TLS
+#include "tls_gcc.h"
+#endif
+
+#ifdef GPR_MSVC_TLS
+#include "tls_msvc.h"
+#endif
+
+#ifdef GPR_PTHREAD_TLS
+#include "tls_pthread.h"
+#endif
+
+#endif
diff --git a/include/grpc/support/tls_gcc.h b/include/grpc/support/tls_gcc.h
new file mode 100644
index 0000000000000000000000000000000000000000..a078b104ea9594bfe683a80d9f2643ab6012d98d
--- /dev/null
+++ b/include/grpc/support/tls_gcc.h
@@ -0,0 +1,52 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPC_SUPPORT_TLS_GCC_H
+#define GRPC_SUPPORT_TLS_GCC_H
+
+/* Thread local storage based on gcc compiler primitives.
+   #include tls.h to use this - and see that file for documentation */
+
+struct gpr_gcc_thread_local {
+  gpr_intptr value;
+};
+
+#define GPR_TLS_DECL(name) \
+    static __thread struct gpr_gcc_thread_local name = {0}
+
+#define gpr_tls_init(tls) do {} while (0)
+#define gpr_tls_destroy(tls) do {} while (0)
+#define gpr_tls_set(tls, new_value) (((tls)->value) = (new_value))
+#define gpr_tls_get(tls) ((tls)->value)
+
+#endif
diff --git a/include/grpc/support/tls_msvc.h b/include/grpc/support/tls_msvc.h
new file mode 100644
index 0000000000000000000000000000000000000000..e574c118844798583e9c77a09f72a6e00c905bf9
--- /dev/null
+++ b/include/grpc/support/tls_msvc.h
@@ -0,0 +1,52 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPC_SUPPORT_TLS_GCC_H
+#define GRPC_SUPPORT_TLS_GCC_H
+
+/* Thread local storage based on ms visual c compiler primitives.
+   #include tls.h to use this - and see that file for documentation */
+
+struct gpr_msvc_thread_local {
+  gpr_intptr value;
+};
+
+#define GPR_TLS_DECL(name) \
+    static __thread struct gpr_msvc_thread_local name = {0}
+
+#define gpr_tls_init(tls) do {} while (0)
+#define gpr_tls_destroy(tls) do {} while (0)
+#define gpr_tls_set(tls, new_value) (((tls)->value) = (new_value))
+#define gpr_tls_get(tls) ((tls)->value)
+
+#endif
diff --git a/include/grpc/support/tls_pthread.h b/include/grpc/support/tls_pthread.h
new file mode 100644
index 0000000000000000000000000000000000000000..249c4d1cab673cc549022c00d345d0f15bbfc34c
--- /dev/null
+++ b/include/grpc/support/tls_pthread.h
@@ -0,0 +1,53 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPC_SUPPORT_TLS_PTHREAD_H
+#define GRPC_SUPPORT_TLS_PTHREAD_H
+
+/* Thread local storage based on pthread library calls.
+   #include tls.h to use this - and see that file for documentation */
+
+struct gpr_pthread_thread_local {
+  pthread_key_t key;
+};
+
+#define GPR_TLS_DECL(name) \
+    static struct gpr_pthread_thread_local name = {0}
+
+#define gpr_tls_init(tls) GPR_ASSERT(0 == pthread_key_create(&(tls)->key, NULL))
+#define gpr_tls_destroy(tls) pthread_key_delete((tls)->key)
+#define gpr_tls_set(tls, new_value) \
+    GPR_ASSERT(pthread_setspecific((tls)->key, (void*)(new_value)) == 0)
+#define gpr_tls_get(tls) ((gpr_intptr)pthread_getspecific((tls)->key))
+
+#endif
diff --git a/src/compiler/cpp_generator.cc b/src/compiler/cpp_generator.cc
index 0a84c7352007f175c26d17c95cd4fa5e8c0af6e4..bd8bf65349ab8677699dc6c644cfa9dd4c5eca77 100644
--- a/src/compiler/cpp_generator.cc
+++ b/src/compiler/cpp_generator.cc
@@ -109,8 +109,47 @@ bool HasBidiStreaming(const grpc::protobuf::FileDescriptor *file) {
   }
   return false;
 }
+
+grpc::string FilenameIdentifier(const grpc::string& filename) {
+  grpc::string result;
+  for (unsigned i = 0; i < filename.size(); i++) {
+    char c = filename[i];
+    if (isalnum(c)) {
+      result.push_back(c);
+    } else {
+      static char hex[] = "0123456789abcdef";
+      result.push_back('_');
+      result.push_back(hex[(c >> 4) & 0xf]);
+      result.push_back(hex[c & 0xf]);
+    }
+  }
+  return result;
+}
 }  // namespace
 
+grpc::string GetHeaderPrologue(const grpc::protobuf::FileDescriptor *file,
+                               const Parameters &params) {
+  grpc::string output;
+  grpc::protobuf::io::StringOutputStream output_stream(&output);
+  grpc::protobuf::io::Printer printer(&output_stream, '$');
+  std::map<grpc::string, grpc::string> vars;
+
+  vars["filename"] = file->name();
+  vars["filename_identifier"] = FilenameIdentifier(file->name());
+  vars["filename_base"] = grpc_generator::StripProto(file->name());
+
+  printer.Print(vars, "// Generated by the gRPC protobuf plugin.\n");
+  printer.Print(vars, "// If you make any local change, they will be lost.\n");
+  printer.Print(vars, "// source: $filename$\n");
+  printer.Print(vars, "#ifndef GRPC_$filename_identifier$__INCLUDED\n");
+  printer.Print(vars, "#define GRPC_$filename_identifier$__INCLUDED\n");
+  printer.Print(vars, "\n");
+  printer.Print(vars, "#include \"$filename_base$.pb.h\"\n");
+  printer.Print(vars, "\n");
+
+  return output;
+}
+
 grpc::string GetHeaderIncludes(const grpc::protobuf::FileDescriptor *file,
                                const Parameters &params) {
   grpc::string temp =
@@ -156,17 +195,22 @@ grpc::string GetHeaderIncludes(const grpc::protobuf::FileDescriptor *file,
         "class ServerAsyncReaderWriter;\n");
   }
   temp.append("}  // namespace grpc\n");
-  return temp;
-}
 
-grpc::string GetSourceIncludes(const Parameters &param) {
-  return "#include <grpc++/async_unary_call.h>\n"
-         "#include <grpc++/channel_interface.h>\n"
-         "#include <grpc++/impl/client_unary_call.h>\n"
-         "#include <grpc++/impl/rpc_method.h>\n"
-         "#include <grpc++/impl/rpc_service_method.h>\n"
-         "#include <grpc++/impl/service_type.h>\n"
-         "#include <grpc++/stream.h>\n";
+  temp.append("\n");
+
+  if (!file->package().empty()) {
+    std::vector<grpc::string> parts =
+        grpc_generator::tokenize(file->package(), ".");
+
+    for (auto part = parts.begin(); part != parts.end(); part++) {
+      temp.append("namespace ");
+      temp.append(*part);
+      temp.append(" {\n");
+    }
+    temp.append("\n");
+  }
+
+  return temp;
 }
 
 void PrintHeaderClientMethod(grpc::protobuf::io::Printer *printer,
@@ -378,6 +422,83 @@ grpc::string GetHeaderServices(const grpc::protobuf::FileDescriptor *file,
   return output;
 }
 
+grpc::string GetHeaderEpilogue(const grpc::protobuf::FileDescriptor *file,
+                               const Parameters &params) {
+  grpc::string output;
+  grpc::protobuf::io::StringOutputStream output_stream(&output);
+  grpc::protobuf::io::Printer printer(&output_stream, '$');
+  std::map<grpc::string, grpc::string> vars;
+
+  vars["filename"] = file->name();
+  vars["filename_identifier"] = FilenameIdentifier(file->name());
+
+  if (!file->package().empty()) {
+    std::vector<grpc::string> parts =
+        grpc_generator::tokenize(file->package(), ".");
+
+    for (auto part = parts.rbegin(); part != parts.rend(); part++) {
+      vars["part"] = *part;
+      printer.Print(vars, "}  // namespace $part$\n");
+    }
+    printer.Print(vars, "\n");
+  }
+
+  printer.Print(vars, "\n");
+  printer.Print(vars, "#endif  // GRPC_$filename_identifier$__INCLUDED\n");
+
+  return output;
+}
+
+grpc::string GetSourcePrologue(const grpc::protobuf::FileDescriptor *file,
+                               const Parameters &params) {
+  grpc::string output;
+  grpc::protobuf::io::StringOutputStream output_stream(&output);
+  grpc::protobuf::io::Printer printer(&output_stream, '$');
+  std::map<grpc::string, grpc::string> vars;
+
+  vars["filename"] = file->name();
+  vars["filename_base"] = grpc_generator::StripProto(file->name());
+
+  printer.Print(vars, "// Generated by the gRPC protobuf plugin.\n");
+  printer.Print(vars, "// If you make any local change, they will be lost.\n");
+  printer.Print(vars, "// source: $filename$\n\n");
+  printer.Print(vars, "#include \"$filename_base$.pb.h\"\n");
+  printer.Print(vars, "#include \"$filename_base$.grpc.pb.h\"\n");
+  printer.Print(vars, "\n");
+
+  return output;
+}
+
+grpc::string GetSourceIncludes(const grpc::protobuf::FileDescriptor *file,
+                               const Parameters &param) {
+  grpc::string output;
+  grpc::protobuf::io::StringOutputStream output_stream(&output);
+  grpc::protobuf::io::Printer printer(&output_stream, '$');
+  std::map<grpc::string, grpc::string> vars;
+
+  printer.Print(vars, "#include <grpc++/async_unary_call.h>\n");
+  printer.Print(vars, "#include <grpc++/channel_interface.h>\n");
+  printer.Print(vars, "#include <grpc++/impl/client_unary_call.h>\n");
+  printer.Print(vars, "#include <grpc++/impl/rpc_method.h>\n");
+  printer.Print(vars, "#include <grpc++/impl/rpc_service_method.h>\n");
+  printer.Print(vars, "#include <grpc++/impl/service_type.h>\n");
+  printer.Print(vars, "#include <grpc++/stream.h>\n");
+
+  if (!file->package().empty()) {
+    std::vector<grpc::string> parts =
+        grpc_generator::tokenize(file->package(), ".");
+
+    for (auto part = parts.begin(); part != parts.end(); part++) {
+      vars["part"] = *part;
+      printer.Print(vars, "namespace $part$ {\n");
+    }
+  }
+
+  printer.Print(vars, "\n");
+
+  return output;
+}
+
 void PrintSourceClientMethod(grpc::protobuf::io::Printer *printer,
                              const grpc::protobuf::MethodDescriptor *method,
                              std::map<grpc::string, grpc::string> *vars) {
@@ -741,4 +862,23 @@ grpc::string GetSourceServices(const grpc::protobuf::FileDescriptor *file,
   return output;
 }
 
+grpc::string GetSourceEpilogue(const grpc::protobuf::FileDescriptor *file,
+                               const Parameters &params) {
+  grpc::string temp;
+
+  if (!file->package().empty()) {
+    std::vector<grpc::string> parts =
+        grpc_generator::tokenize(file->package(), ".");
+
+    for (auto part = parts.begin(); part != parts.end(); part++) {
+      temp.append("}  // namespace ");
+      temp.append(*part);
+      temp.append("\n");
+    }
+    temp.append("\n");
+  }
+
+  return temp;
+}
+
 }  // namespace grpc_cpp_generator
diff --git a/src/compiler/cpp_generator.h b/src/compiler/cpp_generator.h
index 04ad71c0673336352b1a60e408d99df6c8d0f403..70c2e985f6b87e513de9ea1bf43c8519cdeb0415 100644
--- a/src/compiler/cpp_generator.h
+++ b/src/compiler/cpp_generator.h
@@ -44,12 +44,25 @@ struct Parameters {
   grpc::string services_namespace;
 };
 
+// Return the prologue of the generated header file.
+grpc::string GetHeaderPrologue(const grpc::protobuf::FileDescriptor *file,
+                               const Parameters &params);
+
 // Return the includes needed for generated header file.
 grpc::string GetHeaderIncludes(const grpc::protobuf::FileDescriptor *file,
                                const Parameters &params);
 
 // Return the includes needed for generated source file.
-grpc::string GetSourceIncludes(const Parameters &params);
+grpc::string GetSourceIncludes(const grpc::protobuf::FileDescriptor *file,
+                               const Parameters &params);
+
+// Return the epilogue of the generated header file.
+grpc::string GetHeaderEpilogue(const grpc::protobuf::FileDescriptor *file,
+                               const Parameters &params);
+
+// Return the prologue of the generated source file.
+grpc::string GetSourcePrologue(const grpc::protobuf::FileDescriptor *file,
+                               const Parameters &params);
 
 // Return the services for generated header file.
 grpc::string GetHeaderServices(const grpc::protobuf::FileDescriptor *file,
@@ -59,6 +72,10 @@ grpc::string GetHeaderServices(const grpc::protobuf::FileDescriptor *file,
 grpc::string GetSourceServices(const grpc::protobuf::FileDescriptor *file,
                                const Parameters &params);
 
+// Return the epilogue of the generated source file.
+grpc::string GetSourceEpilogue(const grpc::protobuf::FileDescriptor *file,
+                               const Parameters &params);
+
 }  // namespace grpc_cpp_generator
 
 #endif  // GRPC_INTERNAL_COMPILER_CPP_GENERATOR_H
diff --git a/src/compiler/cpp_plugin.cc b/src/compiler/cpp_plugin.cc
index acbe128213a2b34faf97d59f7c7d3e09d171b5d9..88c704948ecc59aa5f8952b63145c691386ce7be 100644
--- a/src/compiler/cpp_plugin.cc
+++ b/src/compiler/cpp_plugin.cc
@@ -58,11 +58,6 @@ class CppGrpcGenerator : public grpc::protobuf::compiler::CodeGenerator {
       return false;
     }
 
-    if (file->service_count() == 0) {
-      // No services.  Do nothing.
-      return true;
-    }
-
     grpc_cpp_generator::Parameters generator_parameters;
 
     if (!parameter.empty()) {
@@ -84,16 +79,27 @@ class CppGrpcGenerator : public grpc::protobuf::compiler::CodeGenerator {
 
     grpc::string file_name = grpc_generator::StripProto(file->name());
 
-    // Generate .pb.h
-    Insert(context, file_name + ".pb.h", "includes",
-           grpc_cpp_generator::GetHeaderIncludes(file, generator_parameters));
-    Insert(context, file_name + ".pb.h", "namespace_scope",
-           grpc_cpp_generator::GetHeaderServices(file, generator_parameters));
-    // Generate .pb.cc
-    Insert(context, file_name + ".pb.cc", "includes",
-           grpc_cpp_generator::GetSourceIncludes(generator_parameters));
-    Insert(context, file_name + ".pb.cc", "namespace_scope",
-           grpc_cpp_generator::GetSourceServices(file, generator_parameters));
+    grpc::string header_code =
+        grpc_cpp_generator::GetHeaderPrologue(file, generator_parameters) +
+        grpc_cpp_generator::GetHeaderIncludes(file, generator_parameters) +
+        grpc_cpp_generator::GetHeaderServices(file, generator_parameters) +
+        grpc_cpp_generator::GetHeaderEpilogue(file, generator_parameters);
+    std::unique_ptr<grpc::protobuf::io::ZeroCopyOutputStream> header_output(
+        context->Open(file_name + ".grpc.pb.h"));
+    grpc::protobuf::io::CodedOutputStream header_coded_out(
+        header_output.get());
+    header_coded_out.WriteRaw(header_code.data(), header_code.size());
+
+    grpc::string source_code =
+        grpc_cpp_generator::GetSourcePrologue(file, generator_parameters) +
+        grpc_cpp_generator::GetSourceIncludes(file, generator_parameters) +
+        grpc_cpp_generator::GetSourceServices(file, generator_parameters) +
+        grpc_cpp_generator::GetSourceEpilogue(file, generator_parameters);
+    std::unique_ptr<grpc::protobuf::io::ZeroCopyOutputStream> source_output(
+        context->Open(file_name + ".grpc.pb.cc"));
+    grpc::protobuf::io::CodedOutputStream source_coded_out(
+        source_output.get());
+    source_coded_out.WriteRaw(source_code.data(), source_code.size());
 
     return true;
   }
diff --git a/src/compiler/generator_helpers.h b/src/compiler/generator_helpers.h
index 30857891c77dee85042c021f1ecdd4bd1bf115de..374e1374cf4c4a12de9fdabe1f28759d4bf2a671 100644
--- a/src/compiler/generator_helpers.h
+++ b/src/compiler/generator_helpers.h
@@ -95,6 +95,27 @@ inline std::vector<grpc::string> tokenize(const grpc::string &input,
   }
 }
 
+inline grpc::string CapitalizeFirstLetter(grpc::string s) {
+  if (s.empty()) {
+    return s;
+  }
+  s[0] = ::toupper(s[0]);
+  return s;
+}
+
+inline grpc::string LowerUnderscoreToUpperCamel(grpc::string str) {
+  std::vector<grpc::string> tokens = tokenize(str, "_");
+  grpc::string result = "";
+  for (unsigned int i = 0; i < tokens.size(); i++) {
+    result += CapitalizeFirstLetter(tokens[i]);
+  }
+  return result;
+}
+
+inline grpc::string FileNameInUpperCamel(const grpc::protobuf::FileDescriptor *file) {
+  return LowerUnderscoreToUpperCamel(StripProto(file->name()));
+}
+
 }  // namespace grpc_generator
 
 #endif  // GRPC_INTERNAL_COMPILER_GENERATOR_HELPERS_H
diff --git a/src/compiler/objective_c_generator.cc b/src/compiler/objective_c_generator.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c68c9c37c21fd2db1aaffb431db64412db981a26
--- /dev/null
+++ b/src/compiler/objective_c_generator.cc
@@ -0,0 +1,236 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <map>
+
+#include "src/compiler/objective_c_generator.h"
+#include "src/compiler/objective_c_generator_helpers.h"
+
+#include "src/compiler/config.h"
+
+#include <sstream>
+
+namespace grpc_objective_c_generator {
+namespace {
+
+void PrintSimpleBlockSignature(grpc::protobuf::io::Printer *printer,
+                               const grpc::protobuf::MethodDescriptor *method,
+                               std::map<grpc::string, grpc::string> *vars) {
+  (*vars)["method_name"] = method->name();
+  (*vars)["request_type"] = PrefixedName(method->input_type()->name());
+  (*vars)["response_type"] = PrefixedName(method->output_type()->name());
+
+  if (method->server_streaming()) {
+    printer->Print("// When the response stream finishes, the handler is "
+                   "called with nil for both arguments.\n\n");
+  } else {
+    printer->Print("// The handler is only called once.\n\n");
+  }
+  printer->Print(*vars, "- (id<GRXLiveSource>)$method_name$WithRequest:"
+                 "($request_type$)request completionHandler:(void(^)"
+                 "($response_type$ *, NSError *))handler");
+}
+
+void PrintSimpleDelegateSignature(grpc::protobuf::io::Printer *printer,
+                                  const grpc::protobuf::MethodDescriptor *method,
+                                  std::map<grpc::string, grpc::string> *vars) {
+  (*vars)["method_name"] = method->name();
+  (*vars)["request_type"] = PrefixedName(method->input_type()->name());
+
+  printer->Print(*vars, "- (id<GRXLiveSource>)$method_name$WithRequest:"
+                 "($request_type$)request delegate:(id<GRXSink>)delegate");
+}
+
+void PrintAdvancedSignature(grpc::protobuf::io::Printer *printer,
+                            const grpc::protobuf::MethodDescriptor *method,
+                            std::map<grpc::string, grpc::string> *vars) {
+  (*vars)["method_name"] = method->name();
+  printer->Print(*vars, "- (GRXSource *)$method_name$WithRequest:"
+                 "(id<GRXSource>)request");
+}
+
+void PrintSourceMethodSimpleBlock(grpc::protobuf::io::Printer *printer,
+                                  const grpc::protobuf::MethodDescriptor *method,
+                                  std::map<grpc::string, grpc::string> *vars) {
+  PrintSimpleBlockSignature(printer, method, vars);
+
+  (*vars)["method_name"] = method->name();
+  printer->Print(" {\n");
+  printer->Indent();
+  printer->Print(*vars, "return [[self $method_name$WithRequest:request] "
+                 "connectHandler:^(id value, NSError *error) {\n");
+  printer->Indent();
+  printer->Print("handler(value, error);\n");
+  printer->Outdent();
+  printer->Print("}];\n");
+  printer->Outdent();
+  printer->Print("}\n");
+}
+
+void PrintSourceMethodSimpleDelegate(grpc::protobuf::io::Printer *printer,
+                                     const grpc::protobuf::MethodDescriptor *method,
+                                     std::map<grpc::string, grpc::string> *vars) {
+  PrintSimpleDelegateSignature(printer, method, vars);
+
+  (*vars)["method_name"] = method->name();
+  printer->Print(" {\n");
+  printer->Indent();
+  printer->Print(*vars, "return [[self $method_name$WithRequest:request]"
+                 "connectToSink:delegate];\n");
+  printer->Outdent();
+  printer->Print("}\n");
+}
+
+void PrintSourceMethodAdvanced(grpc::protobuf::io::Printer *printer,
+                               const grpc::protobuf::MethodDescriptor *method,
+                               std::map<grpc::string, grpc::string> *vars) {
+  PrintAdvancedSignature(printer, method, vars);
+
+  (*vars)["method_name"] = method->name();
+  printer->Print(" {\n");
+  printer->Indent();
+  printer->Print(*vars, "return [self $method_name$WithRequest:request "
+                 "client:[self newClient]];\n");
+  printer->Outdent();
+  printer->Print("}\n");
+}
+
+void PrintSourceMethodHandler(grpc::protobuf::io::Printer *printer,
+                              const grpc::protobuf::MethodDescriptor *method,
+                              std::map<grpc::string, grpc::string> *vars) {
+  (*vars)["method_name"] = method->name();
+  (*vars)["response_type"] = PrefixedName(method->output_type()->name());
+  (*vars)["caps_name"] = grpc_generator::CapitalizeFirstLetter(method->name());
+
+  printer->Print(*vars, "- (GRXSource *)$method_name$WithRequest:"
+                 "(id<GRXSource>)request client:(PBgRPCClient *)client {\n");
+  printer->Indent();
+  printer->Print(*vars,
+                 "return [self responseWithMethod:$@\"$caps_name\"\n");
+  printer->Print(*vars,
+                 "                          class:[$response_type$ class]\n");
+  printer->Print("                        request:request\n");
+  printer->Print("                         client:client];\n");
+  printer->Outdent();
+  printer->Print("}\n");
+}
+
+}
+
+grpc::string GetHeader(const grpc::protobuf::ServiceDescriptor *service,
+                       const grpc::string message_header) {
+  grpc::string output;
+  grpc::protobuf::io::StringOutputStream output_stream(&output);
+  grpc::protobuf::io::Printer printer(&output_stream, '$');
+  std::map<grpc::string, grpc::string> vars;
+  printer.Print("#import \"PBgRPCClient.h\"\n");
+  printer.Print("#import \"PBStub.h\"\n");
+  vars["message_header"] = message_header;
+  printer.Print(vars, "#import \"$message_header$\"\n\n");
+  printer.Print("@protocol GRXSource\n");
+  printer.Print("@class GRXSource\n\n");
+  vars["service_name"] = service->name();
+  printer.Print("@protocol $service_name$Stub <NSObject>\n\n");
+  printer.Print("#pragma mark Simple block handlers\n\n");
+  for (int i = 0; i < service->method_count(); i++) {
+    PrintSimpleBlockSignature(&printer, service->method(i), &vars);
+    printer.Print(";\n");
+  }
+  printer.Print("\n");
+  printer.Print("#pragma mark Simple delegate handlers.\n\n");
+  printer.Print("# TODO(jcanizales): Use high-level snippets to remove this duplication.");
+  for (int i = 0; i < service->method_count(); i++) {
+    PrintSimpleDelegateSignature(&printer, service->method(i), &vars);
+    printer.Print(";\n");
+  }
+  printer.Print("\n");
+  printer.Print("#pragma mark Advanced handlers.\n\n");
+  for (int i = 0; i < service->method_count(); i++) {
+    PrintAdvancedSignature(&printer, service->method(i), &vars);
+    printer.Print(";\n");
+  }
+  printer.Print("\n");
+  printer.Print("@end\n\n");
+  printer.Print("// Basic stub that only does marshalling and parsing\n");
+  printer.Print(vars, "@interface $service_name$Stub :"
+                " PBStub<$service_name$Stub>\n");
+  printer.Print("- (instancetype)initWithHost:(NSString *)host;\n");
+  printer.Print("@end\n");
+  return output;
+}
+
+grpc::string GetSource(const grpc::protobuf::ServiceDescriptor *service) {
+  grpc::string output;
+  grpc::protobuf::io::StringOutputStream output_stream(&output);
+  grpc::protobuf::io::Printer printer(&output_stream, '$');
+  std::map<grpc::string, grpc::string> vars;
+  vars["service_name"] = service->name();
+  printer.Print(vars, "#import \"$service_name$Stub.pb.h\"\n");
+  printer.Print("#import \"PBGeneratedMessage+GRXSource.h\"\n\n");
+  vars["full_name"] = service->full_name();
+  printer.Print(vars,
+                "static NSString *const kInterface = @\"$full_name$\";\n");
+  printer.Print("@implementation $service_name$Stub\n\n");
+  printer.Print("- (instancetype)initWithHost:(NSString *)host {\n");
+  printer.Indent();
+  printer.Print("if ((self = [super initWithHost:host "
+                "interface:kInterface])) {\n");
+  printer.Print("}\n");
+  printer.Print("return self;\n");
+  printer.Outdent();
+  printer.Print("}\n\n");
+  printer.Print("#pragma mark Simple block handlers.\n");
+  for (int i = 0; i < service->method_count(); i++) {
+    PrintSourceMethodSimpleBlock(&printer, service->method(i), &vars);
+  }
+  printer.Print("\n");
+  printer.Print("#pragma mark Simple delegate handlers.\n");
+  for (int i = 0; i < service->method_count(); i++) {
+    PrintSourceMethodSimpleDelegate(&printer, service->method(i), &vars);
+  }
+  printer.Print("\n");
+  printer.Print("#pragma mark Advanced handlers.\n");
+  for (int i = 0; i < service->method_count(); i++) {
+    PrintSourceMethodAdvanced(&printer, service->method(i), &vars);
+  }
+  printer.Print("\n");
+  printer.Print("#pragma mark Handlers for subclasses "
+                "(stub wrappers) to override.\n");
+  for (int i = 0; i < service->method_count(); i++) {
+    PrintSourceMethodHandler(&printer, service->method(i), &vars);
+  }
+  printer.Print("@end\n");
+  return output;
+}
+
+} // namespace grpc_objective_c_generator
diff --git a/src/ruby/ext/grpc/rb_event.h b/src/compiler/objective_c_generator.h
similarity index 75%
rename from src/ruby/ext/grpc/rb_event.h
rename to src/compiler/objective_c_generator.h
index 3105934b110dd7c66b539e9caf9d845dbe0fbe53..93c730b34e4473fa71a20e0a5817b938ee1cf9fc 100644
--- a/src/ruby/ext/grpc/rb_event.h
+++ b/src/compiler/objective_c_generator.h
@@ -31,23 +31,18 @@
  *
  */
 
-#ifndef GRPC_RB_EVENT_H_
-#define GRPC_RB_EVENT_H_
+#ifndef GRPC_INTERNAL_COMPILER_OBJECTIVE_C_GENERATOR_H
+#define GRPC_INTERNAL_COMPILER_OBJECTIVE_C_GENERATOR_H
 
-#include <ruby.h>
-#include <grpc/grpc.h>
+#include "src/compiler/config.h"
 
-/* rb_cEvent is the Event class whose instances proxy grpc_event. */
-extern VALUE rb_cEvent;
+namespace grpc_objective_c_generator {
 
-/* rb_cEventError is the ruby class that acts the exception thrown during rpc
-   event processing. */
-extern VALUE rb_eEventError;
+grpc::string GetHeader(const grpc::protobuf::ServiceDescriptor *service,
+                       const grpc::string message_header);
 
-/* Used to create new ruby event objects */
-VALUE grpc_rb_new_event(grpc_event *ev);
+grpc::string GetSource(const grpc::protobuf::ServiceDescriptor *service);
 
-/* Initializes the Event and EventError classes. */
-void Init_grpc_event();
+}  // namespace grpc_objective_c_generator
 
-#endif /* GRPC_RB_EVENT_H_ */
+#endif  // GRPC_INTERNAL_COMPILER_OBJECTIVE_C_GENERATOR_H
diff --git a/src/compiler/objective_c_generator_helpers.h b/src/compiler/objective_c_generator_helpers.h
new file mode 100644
index 0000000000000000000000000000000000000000..6a7c13991fde9baafc62c8d4473dbb1d82cc8e1b
--- /dev/null
+++ b/src/compiler/objective_c_generator_helpers.h
@@ -0,0 +1,58 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPC_INTERNAL_COMPILER_OBJECTIVE_C_GENERATOR_HELPERS_H
+#define GRPC_INTERNAL_COMPILER_OBJECTIVE_C_GENERATOR_HELPERS_H
+
+#include <map>
+#include "src/compiler/config.h"
+#include "src/compiler/generator_helpers.h"
+
+namespace grpc_objective_c_generator {
+
+const grpc::string prefix = "PBG";
+
+inline grpc::string MessageHeaderName(const grpc::protobuf::FileDescriptor *file) {
+  return grpc_generator::FileNameInUpperCamel(file) + ".pb.h";
+}
+
+inline grpc::string StubFileName(grpc::string service_name) {
+  return prefix + service_name + "Stub";
+}
+
+inline grpc::string PrefixedName(grpc::string name) {
+  return prefix + name;
+}
+
+}
+#endif  // GRPC_INTERNAL_COMPILER_OBJECTIVE_C_GENERATOR_HELPERS_H
diff --git a/src/compiler/objective_c_plugin.cc b/src/compiler/objective_c_plugin.cc
new file mode 100644
index 0000000000000000000000000000000000000000..eebce0cd20dba8b58b9d778b5d5a13cb47417107
--- /dev/null
+++ b/src/compiler/objective_c_plugin.cc
@@ -0,0 +1,98 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+// Generates Objective C gRPC service interface out of Protobuf IDL.
+
+#include <memory>
+
+#include "src/compiler/config.h"
+#include "src/compiler/objective_c_generator.h"
+#include "src/compiler/objective_c_generator_helpers.h"
+
+class ObjectiveCGrpcGenerator : public grpc::protobuf::compiler::CodeGenerator {
+ public:
+  ObjectiveCGrpcGenerator() {}
+  virtual ~ObjectiveCGrpcGenerator() {}
+
+  virtual bool Generate(const grpc::protobuf::FileDescriptor *file,
+                        const grpc::string &parameter,
+                        grpc::protobuf::compiler::GeneratorContext *context,
+                        grpc::string *error) const {
+
+    if (file->service_count() == 0) {
+      // No services.  Do nothing.
+      return true;
+    }
+
+    for (int i = 0; i < file->service_count(); i++) {
+      const grpc::protobuf::ServiceDescriptor *service = file->service(i);
+      grpc::string file_name = grpc_objective_c_generator::StubFileName(
+          service->name());
+
+      // Generate .pb.h
+      grpc::string header_code = grpc_objective_c_generator::GetHeader(
+          service, grpc_objective_c_generator::MessageHeaderName(file));
+      std::unique_ptr<grpc::protobuf::io::ZeroCopyOutputStream> header_output(
+        context->Open(file_name + ".pb.h"));
+      grpc::protobuf::io::CodedOutputStream header_coded_out(
+          header_output.get());
+      header_coded_out.WriteRaw(header_code.data(), header_code.size());
+
+      // Generate .pb.m
+      grpc::string source_code = grpc_objective_c_generator::GetSource(service);
+      std::unique_ptr<grpc::protobuf::io::ZeroCopyOutputStream> source_output(
+        context->Open(file_name + ".pb.m"));
+      grpc::protobuf::io::CodedOutputStream source_coded_out(
+          source_output.get());
+      source_coded_out.WriteRaw(source_code.data(), source_code.size());
+    }
+
+    return true;
+  }
+
+ private:
+  // Insert the given code into the given file at the given insertion point.
+  void Insert(grpc::protobuf::compiler::GeneratorContext *context,
+              const grpc::string &filename, const grpc::string &insertion_point,
+              const grpc::string &code) const {
+    std::unique_ptr<grpc::protobuf::io::ZeroCopyOutputStream> output(
+        context->OpenForInsert(filename, insertion_point));
+    grpc::protobuf::io::CodedOutputStream coded_out(output.get());
+    coded_out.WriteRaw(code.data(), code.size());
+  }
+};
+
+int main(int argc, char *argv[]) {
+  ObjectiveCGrpcGenerator generator;
+  return grpc::protobuf::compiler::PluginMain(argc, argv, &generator);
+}
diff --git a/src/compiler/python_generator.cc b/src/compiler/python_generator.cc
index d32213f7d5e356262ef479430043e8dccf6638e8..72149bc4e3a46f2b6d6d51ba71df929131f09904 100644
--- a/src/compiler/python_generator.cc
+++ b/src/compiler/python_generator.cc
@@ -354,6 +354,7 @@ bool PrintStubFactory(const grpc::string& package_qualified_service_name,
         "Service", service->name(),
       });
   out->Print(dict, "def early_adopter_create_$Service$_stub(host, port,"
+             " metadata_transformer=None,"
              " secure=False, root_certificates=None, private_key=None,"
              " certificate_chain=None, server_host_override=None):\n");
   {
@@ -423,7 +424,8 @@ bool PrintStubFactory(const grpc::string& package_qualified_service_name,
     out->Print(
         "return implementations.stub("
         "\"$PackageQualifiedServiceName$\","
-        " method_invocation_descriptions, host, port, secure=secure,"
+        " method_invocation_descriptions, host, port,"
+        " metadata_transformer=metadata_transformer, secure=secure,"
         " root_certificates=root_certificates, private_key=private_key,"
         " certificate_chain=certificate_chain,"
         " server_host_override=server_host_override)\n",
diff --git a/src/core/iomgr/pollset_multipoller_with_poll_posix.c b/src/core/iomgr/pollset_multipoller_with_poll_posix.c
index 7570ff18c59d0822b1ba76cebb8cdb330a186336..bcef7c35b5da8dd04bf83e40be8e9ad671203f0b 100644
--- a/src/core/iomgr/pollset_multipoller_with_poll_posix.c
+++ b/src/core/iomgr/pollset_multipoller_with_poll_posix.c
@@ -172,6 +172,9 @@ static int multipoll_with_poll_pollset_maybe_work(
   }
 
   r = poll(h->pfds, h->pfd_count, timeout);
+
+  end_polling(pollset);
+
   if (r < 0) {
     if (errno != EINTR) {
       gpr_log(GPR_ERROR, "poll() failed: %s", strerror(errno));
@@ -192,7 +195,6 @@ static int multipoll_with_poll_pollset_maybe_work(
     }
   }
   grpc_pollset_kick_post_poll(&pollset->kick_state);
-  end_polling(pollset);
 
   gpr_mu_lock(&pollset->mu);
   pollset->counter = 0;
diff --git a/src/core/iomgr/pollset_posix.c b/src/core/iomgr/pollset_posix.c
index 0bb722e2b12c44748d089f68e66cd200c522f2f0..03fd94f136424c0091b2ee19d7063b168825b524 100644
--- a/src/core/iomgr/pollset_posix.c
+++ b/src/core/iomgr/pollset_posix.c
@@ -396,6 +396,9 @@ static int unary_poll_pollset_maybe_work(grpc_pollset *pollset,
   pfd[1].events = grpc_fd_begin_poll(fd, pollset, POLLIN, POLLOUT, &fd_watcher);
 
   r = poll(pfd, GPR_ARRAY_SIZE(pfd), timeout);
+
+  grpc_fd_end_poll(&fd_watcher);
+
   if (r < 0) {
     if (errno != EINTR) {
       gpr_log(GPR_ERROR, "poll() failed: %s", strerror(errno));
@@ -415,7 +418,6 @@ static int unary_poll_pollset_maybe_work(grpc_pollset *pollset,
   }
 
   grpc_pollset_kick_post_poll(&pollset->kick_state);
-  grpc_fd_end_poll(&fd_watcher);
 
   gpr_mu_lock(&pollset->mu);
   pollset->counter = 0;
diff --git a/src/core/iomgr/tcp_server.h b/src/core/iomgr/tcp_server.h
index 1e58901a7a68686569e3e630a1867a42cd39d672..66bb3ef70184dd871bd828d87c950b3e1c0cda3b 100644
--- a/src/core/iomgr/tcp_server.h
+++ b/src/core/iomgr/tcp_server.h
@@ -71,8 +71,8 @@ int grpc_tcp_server_add_port(grpc_tcp_server *s, const void *addr,
    up when grpc_tcp_server_destroy is called. */
 int grpc_tcp_server_get_fd(grpc_tcp_server *s, unsigned index);
 
-void grpc_tcp_server_destroy(grpc_tcp_server *server, 
-                             void (*shutdown_done)(void *shutdown_done_arg), 
+void grpc_tcp_server_destroy(grpc_tcp_server *server,
+                             void (*shutdown_done)(void *shutdown_done_arg),
                              void *shutdown_done_arg);
 
-#endif  /* GRPC_INTERNAL_CORE_IOMGR_TCP_SERVER_H */
+#endif /* GRPC_INTERNAL_CORE_IOMGR_TCP_SERVER_H */
diff --git a/src/core/iomgr/tcp_server_posix.c b/src/core/iomgr/tcp_server_posix.c
index 482166e2eb67a6275a1f14669b613ffc018f001a..895f85fc68273e7ac6a9d9697da948138f007299 100644
--- a/src/core/iomgr/tcp_server_posix.c
+++ b/src/core/iomgr/tcp_server_posix.c
@@ -154,13 +154,15 @@ static void destroyed_port(void *server, int success) {
 
 static void dont_care_about_shutdown_completion(void *ignored) {}
 
-void grpc_tcp_server_destroy(grpc_tcp_server *s, 
-                             void (*shutdown_complete)(void *shutdown_complete_arg),
-                             void *shutdown_complete_arg) {
+void grpc_tcp_server_destroy(
+    grpc_tcp_server *s, void (*shutdown_complete)(void *shutdown_complete_arg),
+    void *shutdown_complete_arg) {
   size_t i;
   gpr_mu_lock(&s->mu);
 
-  s->shutdown_complete = shutdown_complete ? shutdown_complete : dont_care_about_shutdown_completion;
+  s->shutdown_complete = shutdown_complete
+                             ? shutdown_complete
+                             : dont_care_about_shutdown_completion;
   s->shutdown_complete_arg = shutdown_complete_arg;
 
   /* shutdown all fd's */
diff --git a/src/core/iomgr/tcp_server_windows.c b/src/core/iomgr/tcp_server_windows.c
index 896c9e5d08a2d1c915a561e685ecb62aa01afe77..a43d5670a41068a93ac3df5ce670cbfcabf2a4b8 100644
--- a/src/core/iomgr/tcp_server_windows.c
+++ b/src/core/iomgr/tcp_server_windows.c
@@ -93,8 +93,8 @@ grpc_tcp_server *grpc_tcp_server_create(void) {
 }
 
 void grpc_tcp_server_destroy(grpc_tcp_server *s,
-                             void(*shutdown_done)(void *shutdown_done_arg),
-	                         void *shutdown_done_arg) {
+                             void (*shutdown_done)(void *shutdown_done_arg),
+                             void *shutdown_done_arg) {
   size_t i;
   gpr_mu_lock(&s->mu);
   /* shutdown all fd's */
@@ -116,13 +116,13 @@ void grpc_tcp_server_destroy(grpc_tcp_server *s,
   gpr_free(s);
 
   if (shutdown_done) {
-	shutdown_done(shutdown_done_arg);
+    shutdown_done(shutdown_done_arg);
   }
 }
 
 /* Prepare a recently-created socket for listening. */
-static int prepare_socket(SOCKET sock,
-                          const struct sockaddr *addr, int addr_len) {
+static int prepare_socket(SOCKET sock, const struct sockaddr *addr,
+                          int addr_len) {
   struct sockaddr_storage sockname_temp;
   socklen_t sockname_len;
 
@@ -153,15 +153,15 @@ static int prepare_socket(SOCKET sock,
   }
 
   sockname_len = sizeof(sockname_temp);
-  if (getsockname(sock, (struct sockaddr *) &sockname_temp, &sockname_len)
-        == SOCKET_ERROR) {
+  if (getsockname(sock, (struct sockaddr *)&sockname_temp, &sockname_len) ==
+      SOCKET_ERROR) {
     char *utf8_message = gpr_format_message(WSAGetLastError());
     gpr_log(GPR_ERROR, "getsockname: %s", utf8_message);
     gpr_free(utf8_message);
     goto error;
   }
 
-  return grpc_sockaddr_get_port((struct sockaddr *) &sockname_temp);
+  return grpc_sockaddr_get_port((struct sockaddr *)&sockname_temp);
 
 error:
   if (sock != INVALID_SOCKET) closesocket(sock);
@@ -227,8 +227,7 @@ static void on_accept(void *arg, int success) {
     DWORD transfered_bytes = 0;
     DWORD flags;
     BOOL wsa_success = WSAGetOverlappedResult(sock, &info->overlapped,
-                                              &transfered_bytes, FALSE,
-                                              &flags);
+                                              &transfered_bytes, FALSE, &flags);
     if (!wsa_success) {
       char *utf8_message = gpr_format_message(WSAGetLastError());
       gpr_log(GPR_ERROR, "on_accept error: %s", utf8_message);
@@ -263,9 +262,9 @@ static int add_socket_to_server(grpc_tcp_server *s, SOCKET sock,
 
   if (sock == INVALID_SOCKET) return -1;
 
-  status = WSAIoctl(sock, SIO_GET_EXTENSION_FUNCTION_POINTER,
-                    &guid, sizeof(guid), &AcceptEx, sizeof(AcceptEx),
-                    &ioctl_num_bytes, NULL, NULL);
+  status =
+      WSAIoctl(sock, SIO_GET_EXTENSION_FUNCTION_POINTER, &guid, sizeof(guid),
+               &AcceptEx, sizeof(AcceptEx), &ioctl_num_bytes, NULL, NULL);
 
   if (status != 0) {
     char *utf8_message = gpr_format_message(WSAGetLastError());
@@ -313,9 +312,8 @@ int grpc_tcp_server_add_port(grpc_tcp_server *s, const void *addr,
     for (i = 0; i < s->nports; i++) {
       sockname_len = sizeof(sockname_temp);
       if (0 == getsockname(s->ports[i].socket->socket,
-                           (struct sockaddr *) &sockname_temp,
-                           &sockname_len)) {
-        port = grpc_sockaddr_get_port((struct sockaddr *) &sockname_temp);
+                           (struct sockaddr *)&sockname_temp, &sockname_len)) {
+        port = grpc_sockaddr_get_port((struct sockaddr *)&sockname_temp);
         if (port > 0) {
           allocated_addr = malloc(addr_len);
           memcpy(allocated_addr, addr, addr_len);
@@ -336,7 +334,7 @@ int grpc_tcp_server_add_port(grpc_tcp_server *s, const void *addr,
   if (grpc_sockaddr_is_wildcard(addr, &port)) {
     grpc_sockaddr_make_wildcard6(port, &wildcard);
 
-    addr = (struct sockaddr *) &wildcard;
+    addr = (struct sockaddr *)&wildcard;
     addr_len = sizeof(wildcard);
   }
 
@@ -375,4 +373,4 @@ void grpc_tcp_server_start(grpc_tcp_server *s, grpc_pollset **pollset,
   gpr_mu_unlock(&s->mu);
 }
 
-#endif  /* GPR_WINSOCK_SOCKET */
+#endif /* GPR_WINSOCK_SOCKET */
diff --git a/src/core/security/server_secure_chttp2.c b/src/core/security/server_secure_chttp2.c
index d5b3a82b8783c7c3b5481340da7a72d44f3325cf..081272724cf32901de18a0a4f4dcdae96863ad5b 100644
--- a/src/core/security/server_secure_chttp2.c
+++ b/src/core/security/server_secure_chttp2.c
@@ -85,10 +85,10 @@ static void on_secure_transport_setup_done(void *statep,
   if (status == GRPC_SECURITY_OK) {
     gpr_mu_lock(&state->mu);
     if (!state->is_shutdown) {
-      grpc_create_chttp2_transport(
-          setup_transport, state->server,
-          grpc_server_get_channel_args(state->server),
-          secure_endpoint, NULL, 0, grpc_mdctx_create(), 0);
+      grpc_create_chttp2_transport(setup_transport, state->server,
+                                   grpc_server_get_channel_args(state->server),
+                                   secure_endpoint, NULL, 0,
+                                   grpc_mdctx_create(), 0);
     } else {
       /* We need to consume this here, because the server may already have gone
        * away. */
@@ -104,7 +104,8 @@ static void on_secure_transport_setup_done(void *statep,
 static void on_accept(void *statep, grpc_endpoint *tcp) {
   grpc_server_secure_state *state = statep;
   state_ref(state);
-  grpc_setup_secure_transport(state->ctx, tcp, on_secure_transport_setup_done, state);
+  grpc_setup_secure_transport(state->ctx, tcp, on_secure_transport_setup_done,
+                              state);
 }
 
 /* Server callback: start listening on our ports */
@@ -120,12 +121,14 @@ static void destroy(grpc_server *server, void *statep) {
   grpc_server_secure_state *state = statep;
   gpr_mu_lock(&state->mu);
   state->is_shutdown = 1;
-  grpc_tcp_server_destroy(state->tcp, grpc_server_listener_destroy_done, server);
+  grpc_tcp_server_destroy(state->tcp, grpc_server_listener_destroy_done,
+                          server);
   gpr_mu_unlock(&state->mu);
   state_unref(state);
 }
 
-int grpc_server_add_secure_http2_port(grpc_server *server, const char *addr, grpc_server_credentials *creds) {
+int grpc_server_add_secure_http2_port(grpc_server *server, const char *addr,
+                                      grpc_server_credentials *creds) {
   grpc_resolved_addresses *resolved = NULL;
   grpc_tcp_server *tcp = NULL;
   grpc_server_secure_state *state = NULL;
diff --git a/src/core/support/thd.c b/src/core/support/thd.c
new file mode 100644
index 0000000000000000000000000000000000000000..ec308f3119efd29d8f9aec56cfec7da2506325a1
--- /dev/null
+++ b/src/core/support/thd.c
@@ -0,0 +1,66 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+/* Posix implementation for gpr threads. */
+
+#include <memory.h>
+
+#include <grpc/support/thd.h>
+
+enum {
+  GPR_THD_JOINABLE = 1
+};
+
+gpr_thd_options gpr_thd_options_default(void) {
+  gpr_thd_options options;
+  memset(&options, 0, sizeof(options));
+  return options;
+}
+
+void gpr_thd_options_set_detached(gpr_thd_options *options) {
+  options->flags &= ~GPR_THD_JOINABLE;
+}
+
+void gpr_thd_options_set_joinable(gpr_thd_options *options) {
+  options->flags |= GPR_THD_JOINABLE;
+}
+
+int gpr_thd_options_is_detached(const gpr_thd_options *options) {
+  if (!options) return 1;
+  return (options->flags & GPR_THD_JOINABLE) == 0;
+}
+
+int gpr_thd_options_is_joinable(const gpr_thd_options *options) {
+  if (!options) return 0;
+  return (options->flags & GPR_THD_JOINABLE) == GPR_THD_JOINABLE;
+}
diff --git a/src/core/support/thd_posix.c b/src/core/support/thd_posix.c
index f50ea583357169bb78841295dc8a86070f2ce2b4..fa4eb505561063569d2c9bd5d457048d073cb9e7 100644
--- a/src/core/support/thd_posix.c
+++ b/src/core/support/thd_posix.c
@@ -68,7 +68,11 @@ int gpr_thd_new(gpr_thd_id *t, void (*thd_body)(void *arg), void *arg,
   a->arg = arg;
 
   GPR_ASSERT(pthread_attr_init(&attr) == 0);
-  GPR_ASSERT(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0);
+  if (gpr_thd_options_is_detached(options)) {
+    GPR_ASSERT(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0);
+  } else {
+    GPR_ASSERT(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE) == 0);
+  }
   thread_started = (pthread_create(&p, &attr, &thread_body, a) == 0);
   GPR_ASSERT(pthread_attr_destroy(&attr) == 0);
   if (!thread_started) {
@@ -78,14 +82,12 @@ int gpr_thd_new(gpr_thd_id *t, void (*thd_body)(void *arg), void *arg,
   return thread_started;
 }
 
-gpr_thd_options gpr_thd_options_default(void) {
-  gpr_thd_options options;
-  memset(&options, 0, sizeof(options));
-  return options;
-}
-
 gpr_thd_id gpr_thd_currentid(void) {
   return (gpr_thd_id)pthread_self();
 }
 
+void gpr_thd_join(gpr_thd_id t) {
+  pthread_join((pthread_t)t, NULL);
+}
+
 #endif /* GPR_POSIX_SYNC */
diff --git a/src/core/support/thd_win32.c b/src/core/support/thd_win32.c
index 347cad57e3ad1abcd653dbedb1029997e42c6070..3cc798293acfe9cd9a499bd3a7d0e0c4c71d1a72 100644
--- a/src/core/support/thd_win32.c
+++ b/src/core/support/thd_win32.c
@@ -31,7 +31,7 @@
  *
  */
 
-/* Posix implementation for gpr threads. */
+/* Windows implementation for gpr threads. */
 
 #include <grpc/support/port_platform.h>
 
@@ -40,47 +40,81 @@
 #include <windows.h>
 #include <string.h>
 #include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
 #include <grpc/support/thd.h>
 
-struct thd_arg {
+#if defined(_MSC_VER)
+#define thread_local __declspec(thread)
+#elif defined(__GNUC__)
+#define thread_local __thread
+#else
+#error "Unknown compiler - please file a bug report"
+#endif
+
+struct thd_info {
   void (*body)(void *arg); /* body of a thread */
   void *arg;               /* argument to a thread */
+  HANDLE join_event;       /* if joinable, the join event */
+  int joinable;            /* true if not detached */
 };
 
+static thread_local struct thd_info *g_thd_info;
+
+/* Destroys a thread info */
+static void destroy_thread(struct thd_info *t) {
+  if (t->joinable) CloseHandle(t->join_event);
+  gpr_free(t);
+}
+
 /* Body of every thread started via gpr_thd_new. */
 static DWORD WINAPI thread_body(void *v) {
-  struct thd_arg a = *(struct thd_arg *)v;
-  gpr_free(v);
-  (*a.body)(a.arg);
+  g_thd_info = (struct thd_info *)v;
+  g_thd_info->body(g_thd_info->arg);
+  if (g_thd_info->joinable) {
+    BOOL ret = SetEvent(g_thd_info->join_event);
+    GPR_ASSERT(ret);
+  } else {
+    destroy_thread(g_thd_info);
+  }
   return 0;
 }
 
 int gpr_thd_new(gpr_thd_id *t, void (*thd_body)(void *arg), void *arg,
                 const gpr_thd_options *options) {
   HANDLE handle;
-  DWORD thread_id;
-  struct thd_arg *a = gpr_malloc(sizeof(*a));
-  a->body = thd_body;
-  a->arg = arg;
+  struct thd_info *info = gpr_malloc(sizeof(*info));
+  info->body = thd_body;
+  info->arg = arg;
   *t = 0;
-  handle = CreateThread(NULL, 64 * 1024, thread_body, a, 0, &thread_id);
+  if (gpr_thd_options_is_joinable(options)) {
+    info->joinable = 1;
+    info->join_event = CreateEvent(NULL, FALSE, FALSE, NULL);
+    if (info->join_event == NULL) {
+      gpr_free(info);
+      return 0;
+    }
+  } else {
+    info->joinable = 0;
+  }
+  handle = CreateThread(NULL, 64 * 1024, thread_body, info, 0, NULL);
   if (handle == NULL) {
-    gpr_free(a);
+    destroy_thread(info);
   } else {
-    CloseHandle(handle); /* threads are "detached" */
+    *t = (gpr_thd_id)info;
+    CloseHandle(handle);
   }
-  *t = (gpr_thd_id)thread_id;
   return handle != NULL;
 }
 
-gpr_thd_options gpr_thd_options_default(void) {
-  gpr_thd_options options;
-  memset(&options, 0, sizeof(options));
-  return options;
+gpr_thd_id gpr_thd_currentid(void) {
+  return (gpr_thd_id)g_thd_info;
 }
 
-gpr_thd_id gpr_thd_currentid(void) {
-  return (gpr_thd_id)GetCurrentThreadId();
+void gpr_thd_join(gpr_thd_id t) {
+  struct thd_info *info = (struct thd_info *)t;
+  DWORD ret = WaitForSingleObject(info->join_event, INFINITE);
+  GPR_ASSERT(ret == WAIT_OBJECT_0);
+  destroy_thread(info);
 }
 
 #endif /* GPR_WIN32 */
diff --git a/src/core/surface/completion_queue.c b/src/core/surface/completion_queue.c
index b08bd93693ec68ba10d60a4eaccadfffb9dd6833..24f4a05071a1fc18cb7b86c00741db460c1349ec 100644
--- a/src/core/surface/completion_queue.c
+++ b/src/core/surface/completion_queue.c
@@ -436,6 +436,7 @@ grpc_pollset *grpc_cq_pollset(grpc_completion_queue *cc) {
 void grpc_cq_hack_spin_pollset(grpc_completion_queue *cc) {
   gpr_mu_lock(GRPC_POLLSET_MU(&cc->pollset));
   grpc_pollset_kick(&cc->pollset);
-  grpc_pollset_work(&cc->pollset, gpr_time_add(gpr_now(), gpr_time_from_millis(100)));
+  grpc_pollset_work(&cc->pollset,
+                    gpr_time_add(gpr_now(), gpr_time_from_millis(100)));
   gpr_mu_unlock(GRPC_POLLSET_MU(&cc->pollset));
 }
diff --git a/src/core/surface/completion_queue.h b/src/core/surface/completion_queue.h
index 3e9e2d186efe67bc6b061b3f21659908229b4899..3a7cc99dda9c1f15a7fbfbc010a566133c574c35 100644
--- a/src/core/surface/completion_queue.h
+++ b/src/core/surface/completion_queue.h
@@ -116,4 +116,4 @@ grpc_pollset *grpc_cq_pollset(grpc_completion_queue *cc);
 
 void grpc_cq_hack_spin_pollset(grpc_completion_queue *cc);
 
-#endif  /* GRPC_INTERNAL_CORE_SURFACE_COMPLETION_QUEUE_H */
+#endif /* GRPC_INTERNAL_CORE_SURFACE_COMPLETION_QUEUE_H */
diff --git a/src/core/surface/server.c b/src/core/surface/server.c
index 2e013ea74215ce601cc3432822efc576e6537737..17cba9a505b8db0f586c3b5933ddcceafcd62896 100644
--- a/src/core/surface/server.c
+++ b/src/core/surface/server.c
@@ -592,9 +592,8 @@ static void destroy_channel_elem(grpc_channel_element *elem) {
 }
 
 static const grpc_channel_filter server_surface_filter = {
-    call_op,           channel_op,           sizeof(call_data),
-    init_call_elem,    destroy_call_elem,    sizeof(channel_data),
-    init_channel_elem, destroy_channel_elem, "server",
+    call_op, channel_op, sizeof(call_data), init_call_elem, destroy_call_elem,
+    sizeof(channel_data), init_channel_elem, destroy_channel_elem, "server",
 };
 
 static void addcq(grpc_server *server, grpc_completion_queue *cq) {
@@ -737,7 +736,8 @@ grpc_transport_setup_result grpc_server_setup_transport(
   channel = grpc_channel_create_from_filters(filters, num_filters,
                                              s->channel_args, mdctx, 0);
   chand = (channel_data *)grpc_channel_stack_element(
-              grpc_channel_get_channel_stack(channel), 0)->channel_data;
+              grpc_channel_get_channel_stack(channel), 0)
+              ->channel_data;
   chand->server = s;
   server_ref(s);
   chand->channel = channel;
@@ -758,7 +758,7 @@ grpc_transport_setup_result grpc_server_setup_transport(
       method = grpc_mdstr_from_string(mdctx, rm->method);
       hash = GRPC_MDSTR_KV_HASH(host ? host->hash : 0, method->hash);
       for (probes = 0; chand->registered_methods[(hash + probes) % slots]
-                               .server_registered_method != NULL;
+                           .server_registered_method != NULL;
            probes++)
         ;
       if (probes > max_probes) max_probes = probes;
@@ -927,7 +927,8 @@ void grpc_server_destroy(grpc_server *server) {
       gpr_mu_lock(&server->mu);
     }
 
-    gpr_cv_wait(&server->cv, &server->mu, gpr_time_add(gpr_now(), gpr_time_from_millis(100)));
+    gpr_cv_wait(&server->cv, &server->mu,
+                gpr_time_add(gpr_now(), gpr_time_from_millis(100)));
   }
 
   while (server->listeners) {
diff --git a/src/core/surface/server.h b/src/core/surface/server.h
index 548a16c6c96660d2234efbfc5236f658fa9f99cc..2cfa38fa43661df759bb22d4ba7a127a3fa062ae 100644
--- a/src/core/surface/server.h
+++ b/src/core/surface/server.h
@@ -48,7 +48,8 @@ grpc_server *grpc_server_create_from_filters(grpc_completion_queue *cq,
    and when it shuts down, it will call destroy */
 void grpc_server_add_listener(grpc_server *server, void *listener,
                               void (*start)(grpc_server *server, void *arg,
-                                            grpc_pollset **pollsets, size_t npollsets),
+                                            grpc_pollset **pollsets,
+                                            size_t npollsets),
                               void (*destroy)(grpc_server *server, void *arg));
 
 void grpc_server_listener_destroy_done(void *server);
@@ -62,4 +63,4 @@ grpc_transport_setup_result grpc_server_setup_transport(
 
 const grpc_channel_args *grpc_server_get_channel_args(grpc_server *server);
 
-#endif  /* GRPC_INTERNAL_CORE_SURFACE_SERVER_H */
+#endif /* GRPC_INTERNAL_CORE_SURFACE_SERVER_H */
diff --git a/src/core/surface/server_chttp2.c b/src/core/surface/server_chttp2.c
index 9a23125752a77519b98ed48d1a15c094d1ad82b8..f3b9219f8b0f7b7121b709165380ed3dfdd36d9a 100644
--- a/src/core/surface/server_chttp2.c
+++ b/src/core/surface/server_chttp2.c
@@ -66,7 +66,8 @@ static void new_transport(void *server, grpc_endpoint *tcp) {
 }
 
 /* Server callback: start listening on our ports */
-static void start(grpc_server *server, void *tcpp, grpc_pollset **pollsets, size_t pollset_count) {
+static void start(grpc_server *server, void *tcpp, grpc_pollset **pollsets,
+                  size_t pollset_count) {
   grpc_tcp_server *tcp = tcpp;
   grpc_tcp_server_start(tcp, pollsets, pollset_count, new_transport, server);
 }
diff --git a/src/cpp/client/secure_credentials.cc b/src/cpp/client/secure_credentials.cc
index d6f9acc675563c25db05d9543ead6535af615e54..0a73b2c0f676b9154239d784ac156a28f466a941 100644
--- a/src/cpp/client/secure_credentials.cc
+++ b/src/cpp/client/secure_credentials.cc
@@ -31,38 +31,23 @@
  *
  */
 
-#include <grpc/grpc_security.h>
 #include <grpc/support/log.h>
 
 #include <grpc++/channel_arguments.h>
-#include <grpc++/config.h>
-#include <grpc++/credentials.h>
 #include "src/cpp/client/channel.h"
+#include "src/cpp/client/secure_credentials.h"
 
 namespace grpc {
 
-class SecureCredentials GRPC_FINAL : public Credentials {
- public:
-  explicit SecureCredentials(grpc_credentials* c_creds) : c_creds_(c_creds) {}
-  ~SecureCredentials() GRPC_OVERRIDE { grpc_credentials_release(c_creds_); }
-  grpc_credentials* GetRawCreds() { return c_creds_; }
-
-  std::shared_ptr<grpc::ChannelInterface> CreateChannel(
-      const string& target, const grpc::ChannelArguments& args) GRPC_OVERRIDE {
-    grpc_channel_args channel_args;
-    args.SetChannelArgs(&channel_args);
-    return std::shared_ptr<ChannelInterface>(new Channel(
-        args.GetSslTargetNameOverride().empty()
-            ? target
-            : args.GetSslTargetNameOverride(),
-        grpc_secure_channel_create(c_creds_, target.c_str(), &channel_args)));
-  }
-
-  SecureCredentials* AsSecureCredentials() GRPC_OVERRIDE { return this; }
-
- private:
-  grpc_credentials* const c_creds_;
-};
+std::shared_ptr<grpc::ChannelInterface> SecureCredentials::CreateChannel(
+    const string& target, const grpc::ChannelArguments& args) {
+  grpc_channel_args channel_args;
+  args.SetChannelArgs(&channel_args);
+  return std::shared_ptr<ChannelInterface>(new Channel(
+      args.GetSslTargetNameOverride().empty() ? target
+                                              : args.GetSslTargetNameOverride(),
+      grpc_secure_channel_create(c_creds_, target.c_str(), &channel_args)));
+}
 
 namespace {
 std::unique_ptr<Credentials> WrapCredentials(grpc_credentials* creds) {
diff --git a/src/cpp/client/secure_credentials.h b/src/cpp/client/secure_credentials.h
new file mode 100644
index 0000000000000000000000000000000000000000..77d575813eae2968b6139862a385d0aaf1d0b71d
--- /dev/null
+++ b/src/cpp/client/secure_credentials.h
@@ -0,0 +1,61 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPC_INTERNAL_CPP_CLIENT_SECURE_CREDENTIALS_H
+#define GRPC_INTERNAL_CPP_CLIENT_SECURE_CREDENTIALS_H
+
+#include <grpc/grpc_security.h>
+
+#include <grpc++/config.h>
+#include <grpc++/credentials.h>
+
+namespace grpc {
+
+class SecureCredentials GRPC_FINAL : public Credentials {
+ public:
+  explicit SecureCredentials(grpc_credentials* c_creds) : c_creds_(c_creds) {}
+  ~SecureCredentials() GRPC_OVERRIDE { grpc_credentials_release(c_creds_); }
+  grpc_credentials* GetRawCreds() { return c_creds_; }
+
+  std::shared_ptr<grpc::ChannelInterface> CreateChannel(
+      const string& target, const grpc::ChannelArguments& args) GRPC_OVERRIDE;
+  SecureCredentials* AsSecureCredentials() GRPC_OVERRIDE { return this; }
+
+ private:
+  grpc_credentials* const c_creds_;
+};
+
+}  // namespace grpc
+
+#endif  // GRPC_INTERNAL_CPP_CLIENT_SECURE_CREDENTIALS_H
+
diff --git a/src/cpp/server/secure_server_credentials.cc b/src/cpp/server/secure_server_credentials.cc
index 49d69a3fb9a45e7463b8e2744d4d0c275e6d6f4b..3e262dd74f79b1e07ebf0568033785bf702975a4 100644
--- a/src/cpp/server/secure_server_credentials.cc
+++ b/src/cpp/server/secure_server_credentials.cc
@@ -31,39 +31,22 @@
  *
  */
 
-#include <grpc/grpc_security.h>
-
-#include <grpc++/server_credentials.h>
+#include "src/cpp/server/secure_server_credentials.h"
 
 namespace grpc {
 
-namespace {
-class SecureServerCredentials GRPC_FINAL : public ServerCredentials {
- public:
-  explicit SecureServerCredentials(grpc_server_credentials* creds)
-      : creds_(creds) {}
-  ~SecureServerCredentials() GRPC_OVERRIDE {
-    grpc_server_credentials_release(creds_);
-  }
-
-  int AddPortToServer(const grpc::string& addr,
-                      grpc_server* server) GRPC_OVERRIDE {
-    return grpc_server_add_secure_http2_port(server, addr.c_str(), creds_);
-  }
-
- private:
-  grpc_server_credentials* const creds_;
-};
-}  // namespace
+int SecureServerCredentials::AddPortToServer(
+    const grpc::string& addr, grpc_server* server) {
+  return grpc_server_add_secure_http2_port(server, addr.c_str(), creds_);
+}
 
 std::shared_ptr<ServerCredentials> SslServerCredentials(
     const SslServerCredentialsOptions& options) {
   std::vector<grpc_ssl_pem_key_cert_pair> pem_key_cert_pairs;
   for (auto key_cert_pair = options.pem_key_cert_pairs.begin();
-       key_cert_pair != options.pem_key_cert_pairs.end();
-       key_cert_pair++) {
+       key_cert_pair != options.pem_key_cert_pairs.end(); key_cert_pair++) {
     grpc_ssl_pem_key_cert_pair p = {key_cert_pair->private_key.c_str(),
-				    key_cert_pair->cert_chain.c_str()};
+                                    key_cert_pair->cert_chain.c_str()};
     pem_key_cert_pairs.push_back(p);
   }
   grpc_server_credentials* c_creds = grpc_ssl_server_credentials_create(
diff --git a/src/cpp/server/secure_server_credentials.h b/src/cpp/server/secure_server_credentials.h
new file mode 100644
index 0000000000000000000000000000000000000000..b9803f107e5d587774809d2b694ca5ed4f5b4402
--- /dev/null
+++ b/src/cpp/server/secure_server_credentials.h
@@ -0,0 +1,60 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPC_INTERNAL_CPP_SERVER_SECURE_SERVER_CREDENTIALS_H
+#define GRPC_INTERNAL_CPP_SERVER_SECURE_SERVER_CREDENTIALS_H
+
+#include <grpc/grpc_security.h>
+
+#include <grpc++/server_credentials.h>
+
+namespace grpc {
+
+class SecureServerCredentials GRPC_FINAL : public ServerCredentials {
+ public:
+  explicit SecureServerCredentials(grpc_server_credentials* creds)
+      : creds_(creds) {}
+  ~SecureServerCredentials() GRPC_OVERRIDE {
+    grpc_server_credentials_release(creds_);
+  }
+
+  int AddPortToServer(const grpc::string& addr,
+                      grpc_server* server) GRPC_OVERRIDE;
+
+ private:
+  grpc_server_credentials* const creds_;
+};
+
+}  // namespace grpc
+
+#endif  // GRPC_INTERNAL_CPP_SERVER_SECURE_SERVER_CREDENTIALS_H
diff --git a/src/cpp/server/server.cc b/src/cpp/server/server.cc
index bd0a23739c3128e6b53648db304dfd0337427e4c..046133c5eb123788126e1b92862413c7012e2fce 100644
--- a/src/cpp/server/server.cc
+++ b/src/cpp/server/server.cc
@@ -183,7 +183,7 @@ Server::Server(ThreadPoolInterface* thread_pool, bool thread_pool_owned)
 
 Server::~Server() {
   {
-    std::unique_lock<std::mutex> lock(mu_);
+    grpc::unique_lock<grpc::mutex> lock(mu_);
     if (started_ && !shutdown_) {
       lock.unlock();
       Shutdown();
@@ -259,7 +259,7 @@ bool Server::Start() {
 }
 
 void Server::Shutdown() {
-  std::unique_lock<std::mutex> lock(mu_);
+  grpc::unique_lock<grpc::mutex> lock(mu_);
   if (started_ && !shutdown_) {
     shutdown_ = true;
     grpc_server_shutdown(server_);
@@ -273,7 +273,7 @@ void Server::Shutdown() {
 }
 
 void Server::Wait() {
-  std::unique_lock<std::mutex> lock(mu_);
+  grpc::unique_lock<grpc::mutex> lock(mu_);
   while (num_running_cb_ != 0) {
     callback_cv_.wait(lock);
   }
@@ -405,7 +405,7 @@ void Server::RequestAsyncGenericCall(GenericServerContext* context,
 
 void Server::ScheduleCallback() {
   {
-    std::unique_lock<std::mutex> lock(mu_);
+    grpc::unique_lock<grpc::mutex> lock(mu_);
     num_running_cb_++;
   }
   thread_pool_->ScheduleCallback(std::bind(&Server::RunRpc, this));
@@ -426,7 +426,7 @@ void Server::RunRpc() {
   }
 
   {
-    std::unique_lock<std::mutex> lock(mu_);
+    grpc::unique_lock<grpc::mutex> lock(mu_);
     num_running_cb_--;
     if (shutdown_) {
       callback_cv_.notify_all();
diff --git a/src/cpp/server/server_context.cc b/src/cpp/server/server_context.cc
index bb3c2d1405fb273210f8e909ae3037a51fd75882..ffd6d30d5d41ccd86a115dd725f7d3cbae1d5539 100644
--- a/src/cpp/server/server_context.cc
+++ b/src/cpp/server/server_context.cc
@@ -33,9 +33,8 @@
 
 #include <grpc++/server_context.h>
 
-#include <mutex>
-
 #include <grpc++/impl/call.h>
+#include <grpc++/impl/sync.h>
 #include <grpc/grpc.h>
 #include <grpc/support/log.h>
 #include "src/cpp/util/time.h"
@@ -57,14 +56,14 @@ class ServerContext::CompletionOp GRPC_FINAL : public CallOpBuffer {
   void Unref();
 
  private:
-  std::mutex mu_;
+  grpc::mutex mu_;
   int refs_;
   bool finalized_;
   bool cancelled_;
 };
 
 void ServerContext::CompletionOp::Unref() {
-  std::unique_lock<std::mutex> lock(mu_);
+  grpc::unique_lock<grpc::mutex> lock(mu_);
   if (--refs_ == 0) {
     lock.unlock();
     delete this;
@@ -73,13 +72,13 @@ void ServerContext::CompletionOp::Unref() {
 
 bool ServerContext::CompletionOp::CheckCancelled(CompletionQueue* cq) {
   cq->TryPluck(this);
-  std::lock_guard<std::mutex> g(mu_);
+  grpc::lock_guard<grpc::mutex> g(mu_);
   return finalized_ ? cancelled_ : false;
 }
 
 bool ServerContext::CompletionOp::FinalizeResult(void** tag, bool* status) {
   GPR_ASSERT(CallOpBuffer::FinalizeResult(tag, status));
-  std::unique_lock<std::mutex> lock(mu_);
+  grpc::unique_lock<grpc::mutex> lock(mu_);
   finalized_ = true;
   if (!*status) cancelled_ = true;
   if (--refs_ == 0) {
diff --git a/src/cpp/server/thread_pool.cc b/src/cpp/server/thread_pool.cc
index 80c96111b1f9c8d697664359672181810e742b07..e8d0e89ed212da151cbce6bbe2548be2718d290a 100644
--- a/src/cpp/server/thread_pool.cc
+++ b/src/cpp/server/thread_pool.cc
@@ -31,6 +31,9 @@
  *
  */
 
+#include <grpc++/impl/sync.h>
+#include <grpc++/impl/thd.h>
+
 #include "src/cpp/server/thread_pool.h"
 
 namespace grpc {
@@ -38,7 +41,7 @@ namespace grpc {
 void ThreadPool::ThreadFunc() {
   for (;;) {
     // Wait until work is available or we are shutting down.
-    std::unique_lock<std::mutex> lock(mu_);
+    grpc::unique_lock<grpc::mutex> lock(mu_);
     if (!shutdown_ && callbacks_.empty()) {
       cv_.wait(lock);
     }
@@ -57,13 +60,13 @@ void ThreadPool::ThreadFunc() {
 
 ThreadPool::ThreadPool(int num_threads) : shutdown_(false) {
   for (int i = 0; i < num_threads; i++) {
-    threads_.push_back(std::thread(&ThreadPool::ThreadFunc, this));
+    threads_.push_back(grpc::thread(&ThreadPool::ThreadFunc, this));
   }
 }
 
 ThreadPool::~ThreadPool() {
   {
-    std::lock_guard<std::mutex> lock(mu_);
+    grpc::lock_guard<grpc::mutex> lock(mu_);
     shutdown_ = true;
     cv_.notify_all();
   }
@@ -73,7 +76,7 @@ ThreadPool::~ThreadPool() {
 }
 
 void ThreadPool::ScheduleCallback(const std::function<void()>& callback) {
-  std::lock_guard<std::mutex> lock(mu_);
+  grpc::lock_guard<grpc::mutex> lock(mu_);
   callbacks_.push(callback);
   cv_.notify_one();
 }
diff --git a/src/cpp/server/thread_pool.h b/src/cpp/server/thread_pool.h
index 41e2009ff1663d3ac76316f340caeff1f7c80d14..0f24d6e9b32de02c74d69f85cd794e0373e4a4a2 100644
--- a/src/cpp/server/thread_pool.h
+++ b/src/cpp/server/thread_pool.h
@@ -35,11 +35,11 @@
 #define GRPC_INTERNAL_CPP_SERVER_THREAD_POOL_H
 
 #include <grpc++/config.h>
+
+#include <grpc++/impl/sync.h>
+#include <grpc++/impl/thd.h>
 #include <grpc++/thread_pool_interface.h>
 
-#include <condition_variable>
-#include <thread>
-#include <mutex>
 #include <queue>
 #include <vector>
 
@@ -53,11 +53,11 @@ class ThreadPool GRPC_FINAL : public ThreadPoolInterface {
   void ScheduleCallback(const std::function<void()>& callback) GRPC_OVERRIDE;
 
  private:
-  std::mutex mu_;
-  std::condition_variable cv_;
+  grpc::mutex mu_;
+  grpc::condition_variable cv_;
   bool shutdown_;
   std::queue<std::function<void()>> callbacks_;
-  std::vector<std::thread> threads_;
+  std::vector<grpc::thread> threads_;
 
   void ThreadFunc();
 };
diff --git a/src/csharp/Grpc.Core.Tests/Properties/AssemblyInfo.cs b/src/csharp/Grpc.Core.Tests/Properties/AssemblyInfo.cs
index e4328806ad4c67c0f2c868afa0969c09b0608d4d..e0f047424513a6a9d13eaf018e73aa44625a9905 100644
--- a/src/csharp/Grpc.Core.Tests/Properties/AssemblyInfo.cs
+++ b/src/csharp/Grpc.Core.Tests/Properties/AssemblyInfo.cs
@@ -9,4 +9,4 @@ using System.Runtime.CompilerServices;
 [assembly: AssemblyCopyright("Google Inc.  All rights reserved.")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
-[assembly: AssemblyVersion("0.1.*")]
+[assembly: AssemblyVersion("0.2.*")]
diff --git a/src/csharp/Grpc.Core/Grpc.Core.nuspec b/src/csharp/Grpc.Core/Grpc.Core.nuspec
index af8a8869ca1ed17754222d6413fc362f5e5e3a80..f2032522c906ac6e2f47d3685978d54cfe6b4de0 100644
--- a/src/csharp/Grpc.Core/Grpc.Core.nuspec
+++ b/src/csharp/Grpc.Core/Grpc.Core.nuspec
@@ -7,7 +7,7 @@
     <description>Core C# implementation of gRPC - an RPC library and framework. See project site for more info.
      This is an experimental release, not ready to use.
     </description>
-    <version>0.1.0</version>
+    <version>0.2.0</version>
     <authors>Google Inc.</authors>
     <owners>jtattermusch</owners>
     <licenseUrl>https://github.com/grpc/grpc/blob/master/LICENSE</licenseUrl>
diff --git a/src/csharp/Grpc.Core/Properties/AssemblyInfo.cs b/src/csharp/Grpc.Core/Properties/AssemblyInfo.cs
index 168939cf8c5c54ea07e6a7e702ed8ac9684210d1..81218cb67e2a769010bb8b55085922f58a936489 100644
--- a/src/csharp/Grpc.Core/Properties/AssemblyInfo.cs
+++ b/src/csharp/Grpc.Core/Properties/AssemblyInfo.cs
@@ -9,6 +9,6 @@ using System.Runtime.CompilerServices;
 [assembly: AssemblyCopyright("Google Inc.  All rights reserved.")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
-[assembly: AssemblyVersion("0.1.*")]
+[assembly: AssemblyVersion("0.2.*")]
 
 [assembly: InternalsVisibleTo("Grpc.Core.Tests")]
diff --git a/src/csharp/Grpc.Examples.MathClient/MathClient.cs b/src/csharp/Grpc.Examples.MathClient/MathClient.cs
index f5956bd33e008cdafe2e0116d76640645e793570..ca7683d399ff2cfbfd278c3cd171e1d41d6eaa34 100644
--- a/src/csharp/Grpc.Examples.MathClient/MathClient.cs
+++ b/src/csharp/Grpc.Examples.MathClient/MathClient.cs
@@ -46,11 +46,15 @@ namespace math
                 MathGrpc.IMathServiceClient stub = new MathGrpc.MathServiceClientStub(channel);
                 MathExamples.DivExample(stub);
 
-                MathExamples.FibExample(stub);
+                MathExamples.DivAsyncExample(stub).Wait();
 
-                MathExamples.SumExample(stub);
+                MathExamples.FibExample(stub).Wait();
 
-                MathExamples.DivManyExample(stub);
+                MathExamples.SumExample(stub).Wait();
+
+                MathExamples.DivManyExample(stub).Wait();
+
+                MathExamples.DependendRequestsExample(stub).Wait();
             }
 
             GrpcEnvironment.Shutdown();
diff --git a/src/csharp/Grpc.Examples.MathClient/Properties/AssemblyInfo.cs b/src/csharp/Grpc.Examples.MathClient/Properties/AssemblyInfo.cs
index 11fc099a954c4b3054a327a9f2d78d85de381340..1989ca84308ea5c276625a880c07076633705593 100644
--- a/src/csharp/Grpc.Examples.MathClient/Properties/AssemblyInfo.cs
+++ b/src/csharp/Grpc.Examples.MathClient/Properties/AssemblyInfo.cs
@@ -9,4 +9,4 @@ using System.Runtime.CompilerServices;
 [assembly: AssemblyCopyright("Google Inc.  All rights reserved.")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
-[assembly: AssemblyVersion("0.1.*")]
+[assembly: AssemblyVersion("0.2.*")]
diff --git a/src/csharp/Grpc.Examples.MathServer/.gitignore b/src/csharp/Grpc.Examples.MathServer/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..1746e3269ed0fcf5cde6ed13a6543865137868c0
--- /dev/null
+++ b/src/csharp/Grpc.Examples.MathServer/.gitignore
@@ -0,0 +1,2 @@
+bin
+obj
diff --git a/src/csharp/Grpc.Examples.MathServer/Grpc.Examples.MathServer.csproj b/src/csharp/Grpc.Examples.MathServer/Grpc.Examples.MathServer.csproj
new file mode 100644
index 0000000000000000000000000000000000000000..3f7e6c076809fb25c8d0ee8e44ffc1149517f9c7
--- /dev/null
+++ b/src/csharp/Grpc.Examples.MathServer/Grpc.Examples.MathServer.csproj
@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">x86</Platform>
+    <ProductVersion>10.0.0</ProductVersion>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{BF62FE08-373A-43D6-9D73-41CAA38B7011}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>Grpc.Examples.MathServer</RootNamespace>
+    <AssemblyName>Grpc.Examples.MathServer</AssemblyName>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug</OutputPath>
+    <DefineConstants>DEBUG;</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <Externalconsole>true</Externalconsole>
+    <PlatformTarget>x86</PlatformTarget>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x86' ">
+    <DebugType>full</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <Externalconsole>true</Externalconsole>
+    <PlatformTarget>x86</PlatformTarget>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="MathServer.cs" />
+  </ItemGroup>
+  <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
+  <ItemGroup>
+    <ProjectReference Include="..\Grpc.Core\Grpc.Core.csproj">
+      <Project>{CCC4440E-49F7-4790-B0AF-FEABB0837AE7}</Project>
+      <Name>Grpc.Core</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\Grpc.Examples\Grpc.Examples.csproj">
+      <Project>{7DC1433E-3225-42C7-B7EA-546D56E27A4B}</Project>
+      <Name>Grpc.Examples</Name>
+    </ProjectReference>
+  </ItemGroup>
+</Project>
\ No newline at end of file
diff --git a/src/csharp/Grpc.Examples.MathServer/MathServer.cs b/src/csharp/Grpc.Examples.MathServer/MathServer.cs
new file mode 100644
index 0000000000000000000000000000000000000000..884a84d0a6c8d1ceb4dadc15e6ebae3a953c14af
--- /dev/null
+++ b/src/csharp/Grpc.Examples.MathServer/MathServer.cs
@@ -0,0 +1,61 @@
+#region Copyright notice and license
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System;
+using System.Runtime.InteropServices;
+using System.Threading;
+using Grpc.Core;
+
+namespace math
+{
+    class MainClass
+    {
+        public static void Main(string[] args)
+        {
+            String host = "0.0.0.0";
+
+            GrpcEnvironment.Initialize();
+
+            Server server = new Server();
+            server.AddServiceDefinition(MathGrpc.BindService(new MathServiceImpl()));
+            int port = server.AddListeningPort(host + ":0");
+            server.Start();
+
+            Console.WriteLine("MathServer listening on port " + port);
+
+            Console.WriteLine("Press any key to stop the server...");
+            Console.ReadKey();
+
+            server.ShutdownAsync().Wait();
+            GrpcEnvironment.Shutdown();
+        }
+    }
+}
diff --git a/src/csharp/Grpc.Examples.MathServer/Properties/AssemblyInfo.cs b/src/csharp/Grpc.Examples.MathServer/Properties/AssemblyInfo.cs
new file mode 100644
index 0000000000000000000000000000000000000000..6b3d0516b90f5d5aabfcd116e0ec086fb2d7f933
--- /dev/null
+++ b/src/csharp/Grpc.Examples.MathServer/Properties/AssemblyInfo.cs
@@ -0,0 +1,12 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+
+[assembly: AssemblyTitle("Grpc.Examples.MathServer")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("")]
+[assembly: AssemblyCopyright("Google Inc.  All rights reserved.")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+[assembly: AssemblyVersion("0.1.*")]
diff --git a/src/csharp/Grpc.Examples.Tests/Grpc.Examples.Tests.csproj b/src/csharp/Grpc.Examples.Tests/Grpc.Examples.Tests.csproj
index cf5a6400796e66b8daf36d0890602e44d15f4ffd..f9c1caf700d010694dde98b7d384788f68ef5f4d 100644
--- a/src/csharp/Grpc.Examples.Tests/Grpc.Examples.Tests.csproj
+++ b/src/csharp/Grpc.Examples.Tests/Grpc.Examples.Tests.csproj
@@ -37,6 +37,18 @@
     <Reference Include="Google.ProtocolBuffers">
       <HintPath>..\packages\Google.ProtocolBuffers.2.4.1.521\lib\net40\Google.ProtocolBuffers.dll</HintPath>
     </Reference>
+    <Reference Include="System.Reactive.Interfaces">
+      <HintPath>..\packages\Rx-Interfaces.2.2.5\lib\net45\System.Reactive.Interfaces.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Reactive.Core">
+      <HintPath>..\packages\Rx-Core.2.2.5\lib\net45\System.Reactive.Core.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Reactive.Linq">
+      <HintPath>..\packages\Rx-Linq.2.2.5\lib\net45\System.Reactive.Linq.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Reactive.PlatformServices">
+      <HintPath>..\packages\Rx-PlatformServices.2.2.5\lib\net45\System.Reactive.PlatformServices.dll</HintPath>
+    </Reference>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Properties\AssemblyInfo.cs" />
diff --git a/src/csharp/Grpc.Examples.Tests/MathClientServerTests.cs b/src/csharp/Grpc.Examples.Tests/MathClientServerTests.cs
index 85f213cb39161da5e8c61723c8ce4b1ff1b4df09..fa5d6688a6bdcaf1ddec742b69cf9c213c02ee3a 100644
--- a/src/csharp/Grpc.Examples.Tests/MathClientServerTests.cs
+++ b/src/csharp/Grpc.Examples.Tests/MathClientServerTests.cs
@@ -33,6 +33,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Reactive.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using Grpc.Core;
@@ -120,14 +121,12 @@ namespace math.Tests
         [Test]
         public void Sum()
         {
-            var res = client.Sum();
-            foreach (var num in new long[] { 10, 20, 30 })
-            {
-                res.Inputs.OnNext(Num.CreateBuilder().SetNum_(num).Build());
-            }
-            res.Inputs.OnCompleted();
+            var clientStreamingResult = client.Sum();
+            var numList = new List<long> { 10, 20, 30 }.ConvertAll(
+                     n => Num.CreateBuilder().SetNum_(n).Build());
+            numList.Subscribe(clientStreamingResult.Inputs);
 
-            Assert.AreEqual(60, res.Task.Result.Num_);
+            Assert.AreEqual(60, clientStreamingResult.Task.Result.Num_);
         }
 
         [Test]
@@ -142,13 +141,7 @@ namespace math.Tests
 
             var recorder = new RecordingObserver<DivReply>();
             var requestObserver = client.DivMany(recorder);
-
-            foreach (var arg in divArgsList)
-            {
-                requestObserver.OnNext(arg);
-            }
-            requestObserver.OnCompleted();
-
+            divArgsList.Subscribe(requestObserver);
             var result = recorder.ToList().Result;
 
             CollectionAssert.AreEqual(new long[] { 3, 4, 3 }, result.ConvertAll((divReply) => divReply.Quotient));
diff --git a/src/csharp/Grpc.Examples.Tests/Properties/AssemblyInfo.cs b/src/csharp/Grpc.Examples.Tests/Properties/AssemblyInfo.cs
index 43c7616ac3afc047aa92279b228e64487254cca9..d78e9210c09cc15cf405daf30aae281f6a20ac76 100644
--- a/src/csharp/Grpc.Examples.Tests/Properties/AssemblyInfo.cs
+++ b/src/csharp/Grpc.Examples.Tests/Properties/AssemblyInfo.cs
@@ -9,4 +9,4 @@ using System.Runtime.CompilerServices;
 [assembly: AssemblyCopyright("Google Inc.  All rights reserved.")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
-[assembly: AssemblyVersion("0.1.*")]
+[assembly: AssemblyVersion("0.2.*")]
diff --git a/src/csharp/Grpc.Examples.Tests/packages.config b/src/csharp/Grpc.Examples.Tests/packages.config
index 51c17bcd5e74685ab31264eae00dc062b5b9083d..06c5e6a4ebeba590275479bbd8ecf913beda4f7c 100644
--- a/src/csharp/Grpc.Examples.Tests/packages.config
+++ b/src/csharp/Grpc.Examples.Tests/packages.config
@@ -1,5 +1,10 @@
-<?xml version="1.0" encoding="utf-8"?>
-<packages>
-  <package id="Google.ProtocolBuffers" version="2.4.1.521" targetFramework="net45" />
-  <package id="NUnit" version="2.6.4" targetFramework="net45" />
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Google.ProtocolBuffers" version="2.4.1.521" targetFramework="net45" />
+  <package id="NUnit" version="2.6.4" targetFramework="net45" />
+  <package id="Rx-Core" version="2.2.5" targetFramework="net45" />
+  <package id="Rx-Interfaces" version="2.2.5" targetFramework="net45" />
+  <package id="Rx-Linq" version="2.2.5" targetFramework="net45" />
+  <package id="Rx-Main" version="2.2.5" targetFramework="net45" />
+  <package id="Rx-PlatformServices" version="2.2.5" targetFramework="net45" />
 </packages>
\ No newline at end of file
diff --git a/src/csharp/Grpc.Examples/MathExamples.cs b/src/csharp/Grpc.Examples/MathExamples.cs
index b8bb7eacbd0f3572ab9ec3aa5660dd0af6e9a613..032372b2a119f25509b6765560ceee1329c2b06b 100644
--- a/src/csharp/Grpc.Examples/MathExamples.cs
+++ b/src/csharp/Grpc.Examples/MathExamples.cs
@@ -45,51 +45,45 @@ namespace math
             Console.WriteLine("Div Result: " + result);
         }
 
-        public static void DivAsyncExample(MathGrpc.IMathServiceClient stub)
+        public static async Task DivAsyncExample(MathGrpc.IMathServiceClient stub)
         {
-            Task<DivReply> call = stub.DivAsync(new DivArgs.Builder { Dividend = 4, Divisor = 5 }.Build());
-            DivReply result = call.Result;
-            Console.WriteLine(result);
+            Task<DivReply> resultTask = stub.DivAsync(new DivArgs.Builder { Dividend = 4, Divisor = 5 }.Build());
+            DivReply result = await resultTask;
+            Console.WriteLine("DivAsync Result: " + result);
         }
 
-        public static void DivAsyncWithCancellationExample(MathGrpc.IMathServiceClient stub)
+        public static async Task DivAsyncWithCancellationExample(MathGrpc.IMathServiceClient stub)
         {
-            Task<DivReply> call = stub.DivAsync(new DivArgs.Builder { Dividend = 4, Divisor = 5 }.Build());
-            DivReply result = call.Result;
+            Task<DivReply> resultTask = stub.DivAsync(new DivArgs.Builder { Dividend = 4, Divisor = 5 }.Build());
+            DivReply result = await resultTask;
             Console.WriteLine(result);
         }
 
-        public static void FibExample(MathGrpc.IMathServiceClient stub)
+        public static async Task FibExample(MathGrpc.IMathServiceClient stub)
         {
             var recorder = new RecordingObserver<Num>();
             stub.Fib(new FibArgs.Builder { Limit = 5 }.Build(), recorder);
-
-            List<Num> numbers = recorder.ToList().Result;
-            Console.WriteLine("Fib Result: " + string.Join("|", recorder.ToList().Result));
+            List<Num> result = await recorder.ToList();
+            Console.WriteLine("Fib Result: " + string.Join("|", result));
         }
 
-        public static void SumExample(MathGrpc.IMathServiceClient stub)
+        public static async Task SumExample(MathGrpc.IMathServiceClient stub)
         {
-            List<Num> numbers = new List<Num>
+            var numbers = new List<Num>
             {
                 new Num.Builder { Num_ = 1 }.Build(),
                 new Num.Builder { Num_ = 2 }.Build(),
                 new Num.Builder { Num_ = 3 }.Build()
             };
 
-            var res = stub.Sum();
-            foreach (var num in numbers)
-            {
-                res.Inputs.OnNext(num);
-            }
-            res.Inputs.OnCompleted();
-
-            Console.WriteLine("Sum Result: " + res.Task.Result);
+            var clientStreamingResult = stub.Sum();
+            numbers.Subscribe(clientStreamingResult.Inputs);
+            Console.WriteLine("Sum Result: " + await clientStreamingResult.Task);
         }
 
-        public static void DivManyExample(MathGrpc.IMathServiceClient stub)
+        public static async Task DivManyExample(MathGrpc.IMathServiceClient stub)
         {
-            List<DivArgs> divArgsList = new List<DivArgs>
+            var divArgsList = new List<DivArgs>
             {
                 new DivArgs.Builder { Dividend = 10, Divisor = 3 }.Build(),
                 new DivArgs.Builder { Dividend = 100, Divisor = 21 }.Build(),
@@ -97,26 +91,27 @@ namespace math
             };
 
             var recorder = new RecordingObserver<DivReply>();
-
             var inputs = stub.DivMany(recorder);
-            foreach (var input in divArgsList)
-            {
-                inputs.OnNext(input);
-            }
-            inputs.OnCompleted();
-
-            Console.WriteLine("DivMany Result: " + string.Join("|", recorder.ToList().Result));
+            divArgsList.Subscribe(inputs);
+            var result = await recorder.ToList();
+            Console.WriteLine("DivMany Result: " + string.Join("|", result));
         }
 
-        public static void DependendRequestsExample(MathGrpc.IMathServiceClient stub)
+        public static async Task DependendRequestsExample(MathGrpc.IMathServiceClient stub)
         {
-            var numberList = new List<Num>
+            var numbers = new List<Num>
             {
-                new Num.Builder { Num_ = 1 }.Build(),
-                new Num.Builder { Num_ = 2 }.Build(), new Num.Builder { Num_ = 3 }.Build()
+                new Num.Builder { Num_ = 1 }.Build(), 
+                new Num.Builder { Num_ = 2 }.Build(),
+                new Num.Builder { Num_ = 3 }.Build()
             };
 
-            numberList.ToObservable();
+            var clientStreamingResult = stub.Sum();
+            numbers.Subscribe(clientStreamingResult.Inputs);
+            Num sum = await clientStreamingResult.Task;
+
+            DivReply result = await stub.DivAsync(new DivArgs.Builder { Dividend = sum.Num_, Divisor = numbers.Count }.Build());
+            Console.WriteLine("Avg Result: " + result);
         }
     }
 }
diff --git a/src/csharp/Grpc.Examples/Properties/AssemblyInfo.cs b/src/csharp/Grpc.Examples/Properties/AssemblyInfo.cs
index b55d24166cc586b02d302e659044f9ef4ee0a2f1..fd1cdbbc1c29ef5f31b22025800971ab3d10cc1b 100644
--- a/src/csharp/Grpc.Examples/Properties/AssemblyInfo.cs
+++ b/src/csharp/Grpc.Examples/Properties/AssemblyInfo.cs
@@ -9,4 +9,4 @@ using System.Runtime.CompilerServices;
 [assembly: AssemblyCopyright("Google Inc.  All rights reserved.")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
-[assembly: AssemblyVersion("0.1.*")]
+[assembly: AssemblyVersion("0.2.*")]
diff --git a/src/csharp/Grpc.IntegrationTesting.Client/Properties/AssemblyInfo.cs b/src/csharp/Grpc.IntegrationTesting.Client/Properties/AssemblyInfo.cs
index c93dd1eb2f318dc8f03b34602c2bbb58a4ac1065..d9d36f03e4254ea39c34a1c5dad20cc8c87de8b3 100644
--- a/src/csharp/Grpc.IntegrationTesting.Client/Properties/AssemblyInfo.cs
+++ b/src/csharp/Grpc.IntegrationTesting.Client/Properties/AssemblyInfo.cs
@@ -9,4 +9,4 @@ using System.Runtime.CompilerServices;
 [assembly: AssemblyCopyright("Google Inc.  All rights reserved.")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
-[assembly: AssemblyVersion("0.1.*")]
+[assembly: AssemblyVersion("0.2.*")]
diff --git a/src/csharp/Grpc.IntegrationTesting.Server/Properties/AssemblyInfo.cs b/src/csharp/Grpc.IntegrationTesting.Server/Properties/AssemblyInfo.cs
index f3def1aea4469c4ce6c38d50f3ae7b7de2030ed8..b0b163b883899a618f9657b5fa8d237d033cd59c 100644
--- a/src/csharp/Grpc.IntegrationTesting.Server/Properties/AssemblyInfo.cs
+++ b/src/csharp/Grpc.IntegrationTesting.Server/Properties/AssemblyInfo.cs
@@ -9,4 +9,4 @@ using System.Runtime.CompilerServices;
 [assembly: AssemblyCopyright("Google Inc.  All rights reserved.")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
-[assembly: AssemblyVersion("0.1.*")]
+[assembly: AssemblyVersion("0.2.*")]
diff --git a/src/csharp/Grpc.IntegrationTesting/Properties/AssemblyInfo.cs b/src/csharp/Grpc.IntegrationTesting/Properties/AssemblyInfo.cs
index f09a448e9e28bc48f073dfbe18cbbcf336882800..fe6c8a8aed43cdb2f7395575da6bf2da18773253 100644
--- a/src/csharp/Grpc.IntegrationTesting/Properties/AssemblyInfo.cs
+++ b/src/csharp/Grpc.IntegrationTesting/Properties/AssemblyInfo.cs
@@ -9,4 +9,4 @@ using System.Runtime.CompilerServices;
 [assembly: AssemblyCopyright("Google Inc.  All rights reserved.")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
-[assembly: AssemblyVersion("0.1.*")]
+[assembly: AssemblyVersion("0.2.*")]
diff --git a/src/csharp/Grpc.nuspec b/src/csharp/Grpc.nuspec
index 96a6aaf6b7265129bcc421ec600b08753028ac46..4c106a2ca2e8504d4b18f4e92ef2499d09d444c1 100644
--- a/src/csharp/Grpc.nuspec
+++ b/src/csharp/Grpc.nuspec
@@ -7,7 +7,7 @@
     <description>C# implementation of gRPC - an RPC library and framework. See project site for more info.
      This is an experimental release, not ready to use.
     </description>
-    <version>0.1.0</version>
+    <version>0.2.0</version>
     <authors>Google Inc.</authors>
     <owners>jtattermusch</owners>
     <licenseUrl>https://github.com/grpc/grpc/blob/master/LICENSE</licenseUrl>
@@ -17,7 +17,7 @@
     <copyright>Copyright 2015, Google Inc.</copyright>
     <tags>gRPC RPC Protocol HTTP/2</tags>
     <dependencies>
-      <dependency id="Grpc.Core" version="0.1.0" />
+      <dependency id="Grpc.Core" version="0.2.0" />
     </dependencies>
   </metadata>
 </package>
diff --git a/src/csharp/Grpc.sln b/src/csharp/Grpc.sln
index 2e6d28869938030b6d789da91c0c25e181200206..2f8c2e171902df02599f5d95335c1d401657907c 100644
--- a/src/csharp/Grpc.sln
+++ b/src/csharp/Grpc.sln
@@ -17,6 +17,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Grpc.IntegrationTesting.Cli
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Grpc.IntegrationTesting.Server", "Grpc.IntegrationTesting.Server\Grpc.IntegrationTesting.Server.csproj", "{A654F3B8-E859-4E6A-B30D-227527DBEF0D}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Grpc.Examples.MathServer", "Grpc.Examples.MathServer\Grpc.Examples.MathServer.csproj", "{BF62FE08-373A-43D6-9D73-41CAA38B7011}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|x86 = Debug|x86
@@ -47,6 +49,10 @@ Global
 		{A654F3B8-E859-4E6A-B30D-227527DBEF0D}.Debug|x86.Build.0 = Debug|x86
 		{A654F3B8-E859-4E6A-B30D-227527DBEF0D}.Release|x86.ActiveCfg = Release|x86
 		{A654F3B8-E859-4E6A-B30D-227527DBEF0D}.Release|x86.Build.0 = Release|x86
+		{BF62FE08-373A-43D6-9D73-41CAA38B7011}.Debug|x86.ActiveCfg = Debug|x86
+		{BF62FE08-373A-43D6-9D73-41CAA38B7011}.Debug|x86.Build.0 = Debug|x86
+		{BF62FE08-373A-43D6-9D73-41CAA38B7011}.Release|x86.ActiveCfg = Release|x86
+		{BF62FE08-373A-43D6-9D73-41CAA38B7011}.Release|x86.Build.0 = Release|x86
 		{C61154BA-DD4A-4838-8420-0162A28925E0}.Debug|x86.ActiveCfg = Debug|x86
 		{C61154BA-DD4A-4838-8420-0162A28925E0}.Debug|x86.Build.0 = Debug|x86
 		{C61154BA-DD4A-4838-8420-0162A28925E0}.Release|x86.ActiveCfg = Release|x86
diff --git a/src/csharp/ext/grpc_csharp_ext.c b/src/csharp/ext/grpc_csharp_ext.c
index 9a1c908d11bba566c8ad58e336a9fefc1d97d7f4..e182468d9b0d0bdfbab4eb9fb154501d735f15d9 100644
--- a/src/csharp/ext/grpc_csharp_ext.c
+++ b/src/csharp/ext/grpc_csharp_ext.c
@@ -731,7 +731,7 @@ grpcsharp_ssl_credentials_create(const char *pem_root_certs,
   }
 }
 
-GPR_EXPORT void grpcsharp_credentials_release(grpc_credentials *creds) {
+GPR_EXPORT void GPR_CALLTYPE grpcsharp_credentials_release(grpc_credentials *creds) {
   grpc_credentials_release(creds);
 }
 
@@ -765,7 +765,7 @@ grpcsharp_ssl_server_credentials_create(
   return creds;
 }
 
-GPR_EXPORT void grpcsharp_server_credentials_release(
+GPR_EXPORT void GPR_CALLTYPE grpcsharp_server_credentials_release(
     grpc_server_credentials *creds) {
   grpc_server_credentials_release(creds);
 }
diff --git a/src/node/binding.gyp b/src/node/binding.gyp
index 7ef3bdf4bdedaf150aaa75d8ef0b4f290d3d877d..83f72fabcac20aca43befd1781091f26d3ac93e7 100644
--- a/src/node/binding.gyp
+++ b/src/node/binding.gyp
@@ -18,12 +18,29 @@
       ],
       'link_settings': {
         'libraries': [
-          '-lrt',
           '-lpthread',
           '-lgrpc',
           '-lgpr'
-        ],
+        ]
       },
+      "conditions": [
+        ['OS == "mac"', {
+          'xcode_settings': {
+            'MACOSX_DEPLOYMENT_TARGET': '10.9',
+            'OTHER_CFLAGS': [
+              '-std=c++11',
+              '-stdlib=libc++'
+            ]
+          }
+        }],
+        ['OS != "mac"', {
+          'link_settings': {
+            'libraries': [
+              '-lrt'
+            ]
+          }
+        }]
+      ],
       "target_name": "grpc",
       "sources": [
         "ext/byte_buffer.cc",
diff --git a/src/node/ext/byte_buffer.cc b/src/node/ext/byte_buffer.cc
index 82b54b518c0e1c1221e632a9e783f8d74d1baa41..01bd92ea52377ee91d9e99fe4c569fcffa740433 100644
--- a/src/node/ext/byte_buffer.cc
+++ b/src/node/ext/byte_buffer.cc
@@ -32,7 +32,6 @@
  */
 
 #include <string.h>
-#include <malloc.h>
 
 #include <node.h>
 #include <nan.h>
diff --git a/src/node/ext/channel.cc b/src/node/ext/channel.cc
index 787e274973fdf7b9cd248a7090c0f08041a3caa3..d37bf763ddc707396783576ac2753bc6e3ef2d30 100644
--- a/src/node/ext/channel.cc
+++ b/src/node/ext/channel.cc
@@ -31,8 +31,6 @@
  *
  */
 
-#include <malloc.h>
-
 #include <vector>
 
 #include <node.h>
diff --git a/src/node/ext/server.cc b/src/node/ext/server.cc
index e47bac833bd24c31cb58e965d700f2ccfb20faaf..3c2396b81012788a6dc954f43276018bd389519c 100644
--- a/src/node/ext/server.cc
+++ b/src/node/ext/server.cc
@@ -38,8 +38,6 @@
 #include <node.h>
 #include <nan.h>
 
-#include <malloc.h>
-
 #include <vector>
 #include "grpc/grpc.h"
 #include "grpc/grpc_security.h"
diff --git a/src/ruby/lib/grpc/core/event.rb b/src/php/bin/generate_proto_php.sh
old mode 100644
new mode 100755
similarity index 83%
rename from src/ruby/lib/grpc/core/event.rb
rename to src/php/bin/generate_proto_php.sh
index 194aa8ecac93026d5dbffe31c159ccefbbb2a690..16f93747ab8e33c3023d3e7836e92e42cfda184e
--- a/src/ruby/lib/grpc/core/event.rb
+++ b/src/php/bin/generate_proto_php.sh
@@ -1,3 +1,4 @@
+#!/bin/sh
 # Copyright 2015, Google Inc.
 # All rights reserved.
 #
@@ -27,18 +28,13 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-require 'grpc'
 
-# GRPC contains the General RPC module.
-module GRPC
-  module Core
-    # Event is a class defined in the c extension
-    #
-    # Here, we add an inspect method.
-    class Event
-      def inspect
-        "<#{self.class}: type:#{type}, tag:#{tag} result:#{result}>"
-      end
-    end
-  end
-end
+set +e
+cd $(dirname $0)
+
+gen_code='../tests/generated_code'
+interop='../tests/interop'
+
+protoc-gen-php -i $gen_code -o $gen_code $gen_code/math.proto
+
+protoc-gen-php -i $interop -o $interop $interop/test.proto
diff --git a/src/php/composer.json b/src/php/composer.json
index dca61a9889aa73463f2d57cd6e92efcad192b8e0..3c0cb37231f60ca43f9b9d5261275e3e5f2b6a83 100644
--- a/src/php/composer.json
+++ b/src/php/composer.json
@@ -1,7 +1,7 @@
 {
   "name": "grpc/grpc",
   "description": "gRPC library for PHP",
-  "version": "0.2.0",
+  "version": "0.5.0",
   "homepage": "http://grpc.io",
   "license": "BSD-3-Clause",
   "require": {
diff --git a/src/php/ext/grpc/call.c b/src/php/ext/grpc/call.c
index 6bc65b53679dd5ed87402d8ddca44431aef15f37..b1525e9246a8dfcd32689b19c404fc3f31bcb18b 100644
--- a/src/php/ext/grpc/call.c
+++ b/src/php/ext/grpc/call.c
@@ -443,8 +443,9 @@ PHP_METHOD(Call, startBatch) {
         add_property_bool(result, "send_status", true);
         break;
       case GRPC_OP_RECV_INITIAL_METADATA:
-        add_property_zval(result, "metadata",
-                          grpc_parse_metadata_array(&recv_metadata));
+        array = grpc_parse_metadata_array(&recv_metadata);
+        add_property_zval(result, "metadata", array);
+        Z_DELREF_P(array);
         break;
       case GRPC_OP_RECV_MESSAGE:
         byte_buffer_to_string(message, &message_str, &message_len);
@@ -458,11 +459,13 @@ PHP_METHOD(Call, startBatch) {
       case GRPC_OP_RECV_STATUS_ON_CLIENT:
         MAKE_STD_ZVAL(recv_status);
         object_init(recv_status);
-        add_property_zval(recv_status, "metadata",
-                          grpc_parse_metadata_array(&recv_trailing_metadata));
+        array = grpc_parse_metadata_array(&recv_trailing_metadata);
+        add_property_zval(recv_status, "metadata", array);
+        Z_DELREF_P(array);
         add_property_long(recv_status, "code", status);
         add_property_string(recv_status, "details", status_details, true);
         add_property_zval(result, "status", recv_status);
+        Z_DELREF_P(recv_status);
         break;
       case GRPC_OP_RECV_CLOSE_ON_SERVER:
         add_property_bool(result, "cancelled", cancelled);
diff --git a/src/php/ext/grpc/channel.c b/src/php/ext/grpc/channel.c
index 51a3eae0f4ea29bbe2e79f02a315646915ba3a81..b8262db162bf48350cd0d05919904d099aff6b1f 100644
--- a/src/php/ext/grpc/channel.c
+++ b/src/php/ext/grpc/channel.c
@@ -62,6 +62,7 @@ void free_wrapped_grpc_channel(void *object TSRMLS_DC) {
   if (channel->wrapped != NULL) {
     grpc_channel_destroy(channel->wrapped);
   }
+  efree(channel->target);
   efree(channel);
 }
 
diff --git a/src/python/README.md b/src/python/README.md
index c8057be38b380a86956d6fb8fc8819ebaf7eb4ed..82bc7767322f0560d6ab7a1ac457786c5c669873 100644
--- a/src/python/README.md
+++ b/src/python/README.md
@@ -42,7 +42,14 @@ $ tools/run_tests/run_python.sh
 Installing
 -----------------------
 
-- [Install the gRPC core](https://github.com/grpc/grpc/blob/master/INSTALL)
+- Install the gRPC core
+  - [Debian package](https://github.com/grpc/grpc/releases)
+    ```
+    $ wget https://github.com/grpc/grpc/releases/download/release-0_5_0/libgrpc_0.5.0_amd64.deb
+    $ wget https://github.com/grpc/grpc/releases/download/release-0_5_0/libgrpc-dev_0.5.0_amd64.deb
+    $ sudo dpkg -i libgrpc_0.5.0_amd64.deb libgrpc-dev_0.5.0_amd64.deb
+    ```
+  - [From source](https://github.com/grpc/grpc/blob/master/INSTALL)
 
 - Install gRPC Python's dependencies
 ```
@@ -53,3 +60,16 @@ $ pip install -r src/python/requirements.txt
 ```
 $ pip install src/python/src
 ```
+
+Packaging to PyPI
+-----------------------
+
+- Install packaging dependencies
+```
+$ pip install setuptools twine
+```
+
+- Push to PyPI
+```
+$ ../../tools/distrib/python/submit.py
+```
diff --git a/src/python/interop/interop/_interop_test_case.py b/src/python/interop/interop/_interop_test_case.py
index fec8f1915d53972d5abe126900636f776275ffe9..cd6a574e90da1561a3a1d3a77c6e01051ca8e118 100644
--- a/src/python/interop/interop/_interop_test_case.py
+++ b/src/python/interop/interop/_interop_test_case.py
@@ -40,16 +40,16 @@ class InteropTestCase(object):
   """
 
   def testEmptyUnary(self):
-    methods.TestCase.EMPTY_UNARY.test_interoperability(self.stub)
+    methods.TestCase.EMPTY_UNARY.test_interoperability(self.stub, None)
 
   def testLargeUnary(self):
-    methods.TestCase.LARGE_UNARY.test_interoperability(self.stub)
+    methods.TestCase.LARGE_UNARY.test_interoperability(self.stub, None)
 
   def testServerStreaming(self):
-    methods.TestCase.SERVER_STREAMING.test_interoperability(self.stub)
+    methods.TestCase.SERVER_STREAMING.test_interoperability(self.stub, None)
 
   def testClientStreaming(self):
-    methods.TestCase.CLIENT_STREAMING.test_interoperability(self.stub)
+    methods.TestCase.CLIENT_STREAMING.test_interoperability(self.stub, None)
 
   def testPingPong(self):
-    methods.TestCase.PING_PONG.test_interoperability(self.stub)
+    methods.TestCase.PING_PONG.test_interoperability(self.stub, None)
diff --git a/src/python/interop/interop/client.py b/src/python/interop/interop/client.py
index 85a0dcd998361942a994942a7dd497ddc825411e..bae5e1746048c8df82e8d5ec739d58a5eaa998bb 100644
--- a/src/python/interop/interop/client.py
+++ b/src/python/interop/interop/client.py
@@ -30,6 +30,7 @@
 """The Python implementation of the GRPC interoperability test client."""
 
 import argparse
+from oauth2client import client as oauth2client_client
 
 from grpc.early_adopter import implementations
 
@@ -43,9 +44,6 @@ def _args():
   parser = argparse.ArgumentParser()
   parser.add_argument(
       '--server_host', help='the host to which to connect', type=str)
-  parser.add_argument(
-      '--server_host_override',
-      help='the server host to which to claim to connect', type=str)
   parser.add_argument(
       '--server_port', help='the port to which to connect', type=int)
   parser.add_argument(
@@ -56,10 +54,25 @@ def _args():
   parser.add_argument(
       '--use_test_ca', help='replace platform root CAs with ca.pem',
       action='store_true')
+  parser.add_argument(
+      '--server_host_override',
+      help='the server host to which to claim to connect', type=str)
+  parser.add_argument('--oauth_scope', help='scope for OAuth tokens', type=str)
+  parser.add_argument(
+      '--default_service_account',
+      help='email address of the default service account', type=str)
   return parser.parse_args()
 
+def _oauth_access_token(args):
+  credentials = client.GoogleCredentials.get_application_default()
+  scoped_credentials = credentials.create_scoped([args.oauth_scope])
+  return scoped_credentials.get_access_token().access_token
 
 def _stub(args):
+  if args.oauth_scope:
+    metadata_transformer = lambda x: [('Authorization', 'Bearer %s' % _oauth_access_token(args))]
+  else:
+    metadata_transformer = lambda x: []
   if args.use_tls:
     if args.use_test_ca:
       root_certificates = resources.test_root_certificates()
@@ -68,7 +81,8 @@ def _stub(args):
 
     stub = implementations.stub(
         methods.SERVICE_NAME, methods.CLIENT_METHODS, args.server_host,
-        args.server_port, secure=True, root_certificates=root_certificates,
+        args.server_port, metadata_transformer=metadata_transformer,
+        secure=True, root_certificates=root_certificates,
         server_host_override=args.server_host_override)
   else:
     stub = implementations.stub(
@@ -89,7 +103,7 @@ def _test_interoperability():
   args = _args()
   stub = _stub(args)
   test_case = _test_case_from_arg(args.test_case)
-  test_case.test_interoperability(stub)
+  test_case.test_interoperability(stub, args)
 
 
 if __name__ == '__main__':
diff --git a/src/python/interop/interop/empty_pb2.py b/src/python/interop/interop/empty_pb2.py
index 732a358a369cdd16a1919a60cd39a9db5a27535a..8c1ce2f13e8a0c759275051338a54dced5bfcced 100644
--- a/src/python/interop/interop/empty_pb2.py
+++ b/src/python/interop/interop/empty_pb2.py
@@ -57,6 +57,7 @@ Empty = _reflection.GeneratedProtocolMessageType('Empty', (_message.Message,), d
 _sym_db.RegisterMessage(Empty)
 
 
-from grpc.framework.face import demonstration as _face_testing
-from grpc.framework.face import interfaces as _face_interfaces
+import abc
+from grpc.early_adopter import implementations
+from grpc.framework.alpha import utilities
 # @@protoc_insertion_point(module_scope)
diff --git a/src/python/interop/interop/messages_pb2.py b/src/python/interop/interop/messages_pb2.py
index d449a991404cf2de155bdd8dab7df4fbd9f41fd6..0bf3d86a31282cab3cf9b113168542c0f021ba9a 100644
--- a/src/python/interop/interop/messages_pb2.py
+++ b/src/python/interop/interop/messages_pb2.py
@@ -441,6 +441,7 @@ StreamingOutputCallResponse = _reflection.GeneratedProtocolMessageType('Streamin
 _sym_db.RegisterMessage(StreamingOutputCallResponse)
 
 
-from grpc.framework.face import demonstration as _face_testing
-from grpc.framework.face import interfaces as _face_interfaces
+import abc
+from grpc.early_adopter import implementations
+from grpc.framework.alpha import utilities
 # @@protoc_insertion_point(module_scope)
diff --git a/src/python/interop/interop/methods.py b/src/python/interop/interop/methods.py
index 79550a37893f506c6e1c27e9cb55a76db0222c8b..c69771dff1ea594e83219549c03224b752f73176 100644
--- a/src/python/interop/interop/methods.py
+++ b/src/python/interop/interop/methods.py
@@ -30,8 +30,12 @@
 """Implementations of interoperability test methods."""
 
 import enum
+import json
+import os
 import threading
 
+from oauth2client import client as oauth2client_client
+
 from grpc.framework.alpha import utilities
 
 from interop import empty_pb2
@@ -150,19 +154,12 @@ SERVER_METHODS = {
 }
 
 
-def _empty_unary(stub):
-  with stub:
-    response = stub.EmptyCall(empty_pb2.Empty(), _TIMEOUT)
-    if not isinstance(response, empty_pb2.Empty):
-      raise TypeError(
-          'response is of type "%s", not empty_pb2.Empty!', type(response))
-
-
-def _large_unary(stub):
+def _large_unary_common_behavior(stub, fill_username, fill_oauth_scope):
   with stub:
     request = messages_pb2.SimpleRequest(
         response_type=messages_pb2.COMPRESSABLE, response_size=314159,
-        payload=messages_pb2.Payload(body=b'\x00' * 271828))
+        payload=messages_pb2.Payload(body=b'\x00' * 271828),
+        fill_username=fill_username, fill_oauth_scope=fill_oauth_scope)
     response_future = stub.UnaryCall.async(request, _TIMEOUT)
     response = response_future.result()
     if response.payload.type is not messages_pb2.COMPRESSABLE:
@@ -171,6 +168,19 @@ def _large_unary(stub):
     if len(response.payload.body) != 314159:
       raise ValueError(
           'response body of incorrect size %d!' % len(response.payload.body))
+    return response
+
+
+def _empty_unary(stub):
+  with stub:
+    response = stub.EmptyCall(empty_pb2.Empty(), _TIMEOUT)
+    if not isinstance(response, empty_pb2.Empty):
+      raise TypeError(
+          'response is of type "%s", not empty_pb2.Empty!', type(response))
+
+
+def _large_unary(stub):
+  _large_unary_common_behavior(stub, False, False)
 
 
 def _client_streaming(stub):
@@ -266,6 +276,28 @@ def _ping_pong(stub):
     pipe.close()
 
 
+def _compute_engine_creds(stub, args):
+  response = _large_unary_common_behavior(stub, True, True)
+  if args.default_service_account != response.username:
+    raise ValueError(
+        'expected username %s, got %s' % (args.default_service_account,
+                                          response.username))
+
+
+def _service_account_creds(stub, args):
+  json_key_filename = os.environ[
+      oauth2client_client.GOOGLE_APPLICATION_CREDENTIALS]
+  wanted_email = json.load(open(json_key_filename, 'rb'))['client_email']
+  response = _large_unary_common_behavior(stub, True, True)
+  if wanted_email != response.username:
+    raise ValueError(
+        'expected username %s, got %s' % (wanted_email, response.username))
+  if response.oauth_scope in args.oauth_scope:
+    raise ValueError(
+        'expected to find oauth scope "%s" in received "%s"' %
+            (response.oauth_scope, args.oauth_scope))
+
+
 @enum.unique
 class TestCase(enum.Enum):
   EMPTY_UNARY = 'empty_unary'
@@ -273,8 +305,10 @@ class TestCase(enum.Enum):
   SERVER_STREAMING = 'server_streaming'
   CLIENT_STREAMING = 'client_streaming'
   PING_PONG = 'ping_pong'
+  COMPUTE_ENGINE_CREDS = 'compute_engine_creds'
+  SERVICE_ACCOUNT_CREDS = 'service_account_creds'
 
-  def test_interoperability(self, stub):
+  def test_interoperability(self, stub, args):
     if self is TestCase.EMPTY_UNARY:
       _empty_unary(stub)
     elif self is TestCase.LARGE_UNARY:
@@ -285,5 +319,9 @@ class TestCase(enum.Enum):
       _client_streaming(stub)
     elif self is TestCase.PING_PONG:
       _ping_pong(stub)
+    elif self is TestCase.COMPUTE_ENGINE_CREDS:
+      _compute_engine_creds(stub, args)
+    elif self is TestCase.SERVICE_ACCOUNT_CREDS:
+      _service_account_creds(stub, args)
     else:
       raise NotImplementedError('Test case "%s" not implemented!' % self.name)
diff --git a/src/python/interop/interop/test_pb2.py b/src/python/interop/interop/test_pb2.py
index e86094611b111edb9eb8170f0d73663b40fab18e..71325d5a9f09b5900b9d1a836df4fac18675a067 100644
--- a/src/python/interop/interop/test_pb2.py
+++ b/src/python/interop/interop/test_pb2.py
@@ -29,121 +29,150 @@ _sym_db.RegisterFileDescriptor(DESCRIPTOR)
 
 
 
-from grpc.framework.face import demonstration as _face_testing
-from grpc.framework.face import interfaces as _face_interfaces
-class TestServiceService(object):
+import abc
+from grpc.early_adopter import implementations
+from grpc.framework.alpha import utilities
+class EarlyAdopterTestServiceServicer(object):
   """<fill me in later!>"""
-  def __init__(self):
-    pass
-class TestServiceServicer(object):
-  """<fill me in later!>"""
-  def EmptyCall(self, arg):
+  __metaclass__ = abc.ABCMeta
+  @abc.abstractmethod
+  def EmptyCall(self, request, context):
+    raise NotImplementedError()
+  @abc.abstractmethod
+  def UnaryCall(self, request, context):
     raise NotImplementedError()
-  def UnaryCall(self, arg):
+  @abc.abstractmethod
+  def StreamingOutputCall(self, request, context):
     raise NotImplementedError()
-  def StreamingOutputCall(self, arg):
+  @abc.abstractmethod
+  def StreamingInputCall(self, request_iterator, context):
     raise NotImplementedError()
-  def StreamingInputCall(self, arg):
+  @abc.abstractmethod
+  def FullDuplexCall(self, request_iterator, context):
     raise NotImplementedError()
-  def FullDuplexCall(self, arg):
+  @abc.abstractmethod
+  def HalfDuplexCall(self, request_iterator, context):
+    raise NotImplementedError()
+class EarlyAdopterTestServiceServer(object):
+  """<fill me in later!>"""
+  __metaclass__ = abc.ABCMeta
+  @abc.abstractmethod
+  def start(self):
     raise NotImplementedError()
-  def HalfDuplexCall(self, arg):
+  @abc.abstractmethod
+  def stop(self):
     raise NotImplementedError()
-class TestServiceStub(object):
+class EarlyAdopterTestServiceStub(object):
   """<fill me in later!>"""
-  def EmptyCall(self, arg):
+  __metaclass__ = abc.ABCMeta
+  @abc.abstractmethod
+  def EmptyCall(self, request):
     raise NotImplementedError()
   EmptyCall.async = None
-  def UnaryCall(self, arg):
+  @abc.abstractmethod
+  def UnaryCall(self, request):
     raise NotImplementedError()
   UnaryCall.async = None
-  def StreamingOutputCall(self, arg):
+  @abc.abstractmethod
+  def StreamingOutputCall(self, request):
     raise NotImplementedError()
   StreamingOutputCall.async = None
-  def StreamingInputCall(self, arg):
+  @abc.abstractmethod
+  def StreamingInputCall(self, request_iterator):
     raise NotImplementedError()
   StreamingInputCall.async = None
-  def FullDuplexCall(self, arg):
+  @abc.abstractmethod
+  def FullDuplexCall(self, request_iterator):
     raise NotImplementedError()
   FullDuplexCall.async = None
-  def HalfDuplexCall(self, arg):
+  @abc.abstractmethod
+  def HalfDuplexCall(self, request_iterator):
     raise NotImplementedError()
   HalfDuplexCall.async = None
-class _TestServiceStub(TestServiceStub):
-  def __init__(self, face_stub, default_timeout):
-    self._face_stub = face_stub
-    self._default_timeout = default_timeout
-    stub_self = self
-    class EmptyCall(object):
-      def __call__(self, arg):
-        return stub_self._face_stub.blocking_value_in_value_out("EmptyCall", arg, stub_self._default_timeout)
-      def async(self, arg):
-        return stub_self._face_stub.future_value_in_value_out("EmptyCall", arg, stub_self._default_timeout)
-    self.EmptyCall = EmptyCall()
-    class UnaryCall(object):
-      def __call__(self, arg):
-        return stub_self._face_stub.blocking_value_in_value_out("UnaryCall", arg, stub_self._default_timeout)
-      def async(self, arg):
-        return stub_self._face_stub.future_value_in_value_out("UnaryCall", arg, stub_self._default_timeout)
-    self.UnaryCall = UnaryCall()
-    class StreamingOutputCall(object):
-      def __call__(self, arg):
-        return stub_self._face_stub.inline_value_in_stream_out("StreamingOutputCall", arg, stub_self._default_timeout)
-      def async(self, arg):
-        return stub_self._face_stub.inline_value_in_stream_out("StreamingOutputCall", arg, stub_self._default_timeout)
-    self.StreamingOutputCall = StreamingOutputCall()
-    class StreamingInputCall(object):
-      def __call__(self, arg):
-        return stub_self._face_stub.blocking_stream_in_value_out("StreamingInputCall", arg, stub_self._default_timeout)
-      def async(self, arg):
-        return stub_self._face_stub.future_stream_in_value_out("StreamingInputCall", arg, stub_self._default_timeout)
-    self.StreamingInputCall = StreamingInputCall()
-    class FullDuplexCall(object):
-      def __call__(self, arg):
-        return stub_self._face_stub.inline_stream_in_stream_out("FullDuplexCall", arg, stub_self._default_timeout)
-      def async(self, arg):
-        return stub_self._face_stub.inline_stream_in_stream_out("FullDuplexCall", arg, stub_self._default_timeout)
-    self.FullDuplexCall = FullDuplexCall()
-    class HalfDuplexCall(object):
-      def __call__(self, arg):
-        return stub_self._face_stub.inline_stream_in_stream_out("HalfDuplexCall", arg, stub_self._default_timeout)
-      def async(self, arg):
-        return stub_self._face_stub.inline_stream_in_stream_out("HalfDuplexCall", arg, stub_self._default_timeout)
-    self.HalfDuplexCall = HalfDuplexCall()
-def mock_TestService(servicer, default_timeout):
-  value_in_value_out = {}
-  value_in_stream_out = {}
-  stream_in_value_out = {}
-  stream_in_stream_out = {}
-  class EmptyCall(_face_interfaces.InlineValueInValueOutMethod):
-    def service(self, request, context):
-      return servicer.EmptyCall(request)
-  value_in_value_out['EmptyCall'] = EmptyCall()
-  class UnaryCall(_face_interfaces.InlineValueInValueOutMethod):
-    def service(self, request, context):
-      return servicer.UnaryCall(request)
-  value_in_value_out['UnaryCall'] = UnaryCall()
-  class StreamingOutputCall(_face_interfaces.InlineValueInStreamOutMethod):
-    def service(self, request, context):
-      return servicer.StreamingOutputCall(request)
-  value_in_stream_out['StreamingOutputCall'] = StreamingOutputCall()
-  class StreamingInputCall(_face_interfaces.InlineStreamInValueOutMethod):
-    def service(self, request, context):
-      return servicer.StreamingInputCall(request)
-  stream_in_value_out['StreamingInputCall'] = StreamingInputCall()
-  class FullDuplexCall(_face_interfaces.InlineStreamInStreamOutMethod):
-    def service(self, request, context):
-      return servicer.FullDuplexCall(request)
-  stream_in_stream_out['FullDuplexCall'] = FullDuplexCall()
-  class HalfDuplexCall(_face_interfaces.InlineStreamInStreamOutMethod):
-    def service(self, request, context):
-      return servicer.HalfDuplexCall(request)
-  stream_in_stream_out['HalfDuplexCall'] = HalfDuplexCall()
-  face_linked_pair = _face_testing.server_and_stub(default_timeout,inline_value_in_value_out_methods=value_in_value_out,inline_value_in_stream_out_methods=value_in_stream_out,inline_stream_in_value_out_methods=stream_in_value_out,inline_stream_in_stream_out_methods=stream_in_stream_out)
-  class LinkedPair(object):
-    def __init__(self, server, stub):
-      self.server = server
-      self.stub = stub
-  stub = _TestServiceStub(face_linked_pair.stub, default_timeout)
-  return LinkedPair(None, stub)
+def early_adopter_create_TestService_server(servicer, port, private_key=None, certificate_chain=None):
+  import test.cpp.interop.empty_pb2
+  import test.cpp.interop.empty_pb2
+  import test.cpp.interop.messages_pb2
+  import test.cpp.interop.messages_pb2
+  import test.cpp.interop.messages_pb2
+  import test.cpp.interop.messages_pb2
+  import test.cpp.interop.messages_pb2
+  import test.cpp.interop.messages_pb2
+  import test.cpp.interop.messages_pb2
+  import test.cpp.interop.messages_pb2
+  import test.cpp.interop.messages_pb2
+  import test.cpp.interop.messages_pb2
+  method_service_descriptions = {
+    "EmptyCall": utilities.unary_unary_service_description(
+      servicer.EmptyCall,
+      test.cpp.interop.empty_pb2.Empty.FromString,
+      test.cpp.interop.empty_pb2.Empty.SerializeToString,
+    ),
+    "FullDuplexCall": utilities.stream_stream_service_description(
+      servicer.FullDuplexCall,
+      test.cpp.interop.messages_pb2.StreamingOutputCallRequest.FromString,
+      test.cpp.interop.messages_pb2.StreamingOutputCallResponse.SerializeToString,
+    ),
+    "HalfDuplexCall": utilities.stream_stream_service_description(
+      servicer.HalfDuplexCall,
+      test.cpp.interop.messages_pb2.StreamingOutputCallRequest.FromString,
+      test.cpp.interop.messages_pb2.StreamingOutputCallResponse.SerializeToString,
+    ),
+    "StreamingInputCall": utilities.stream_unary_service_description(
+      servicer.StreamingInputCall,
+      test.cpp.interop.messages_pb2.StreamingInputCallRequest.FromString,
+      test.cpp.interop.messages_pb2.StreamingInputCallResponse.SerializeToString,
+    ),
+    "StreamingOutputCall": utilities.unary_stream_service_description(
+      servicer.StreamingOutputCall,
+      test.cpp.interop.messages_pb2.StreamingOutputCallRequest.FromString,
+      test.cpp.interop.messages_pb2.StreamingOutputCallResponse.SerializeToString,
+    ),
+    "UnaryCall": utilities.unary_unary_service_description(
+      servicer.UnaryCall,
+      test.cpp.interop.messages_pb2.SimpleRequest.FromString,
+      test.cpp.interop.messages_pb2.SimpleResponse.SerializeToString,
+    ),
+  }
+  return implementations.server("grpc.testing.TestService", method_service_descriptions, port, private_key=private_key, certificate_chain=certificate_chain)
+def early_adopter_create_TestService_stub(host, port, metadata_transformer=None, secure=False, root_certificates=None, private_key=None, certificate_chain=None, server_host_override=None):
+  import test.cpp.interop.empty_pb2
+  import test.cpp.interop.empty_pb2
+  import test.cpp.interop.messages_pb2
+  import test.cpp.interop.messages_pb2
+  import test.cpp.interop.messages_pb2
+  import test.cpp.interop.messages_pb2
+  import test.cpp.interop.messages_pb2
+  import test.cpp.interop.messages_pb2
+  import test.cpp.interop.messages_pb2
+  import test.cpp.interop.messages_pb2
+  import test.cpp.interop.messages_pb2
+  import test.cpp.interop.messages_pb2
+  method_invocation_descriptions = {
+    "EmptyCall": utilities.unary_unary_invocation_description(
+      test.cpp.interop.empty_pb2.Empty.SerializeToString,
+      test.cpp.interop.empty_pb2.Empty.FromString,
+    ),
+    "FullDuplexCall": utilities.stream_stream_invocation_description(
+      test.cpp.interop.messages_pb2.StreamingOutputCallRequest.SerializeToString,
+      test.cpp.interop.messages_pb2.StreamingOutputCallResponse.FromString,
+    ),
+    "HalfDuplexCall": utilities.stream_stream_invocation_description(
+      test.cpp.interop.messages_pb2.StreamingOutputCallRequest.SerializeToString,
+      test.cpp.interop.messages_pb2.StreamingOutputCallResponse.FromString,
+    ),
+    "StreamingInputCall": utilities.stream_unary_invocation_description(
+      test.cpp.interop.messages_pb2.StreamingInputCallRequest.SerializeToString,
+      test.cpp.interop.messages_pb2.StreamingInputCallResponse.FromString,
+    ),
+    "StreamingOutputCall": utilities.unary_stream_invocation_description(
+      test.cpp.interop.messages_pb2.StreamingOutputCallRequest.SerializeToString,
+      test.cpp.interop.messages_pb2.StreamingOutputCallResponse.FromString,
+    ),
+    "UnaryCall": utilities.unary_unary_invocation_description(
+      test.cpp.interop.messages_pb2.SimpleRequest.SerializeToString,
+      test.cpp.interop.messages_pb2.SimpleResponse.FromString,
+    ),
+  }
+  return implementations.stub("grpc.testing.TestService", method_invocation_descriptions, host, port, metadata_transformer=metadata_transformer, secure=secure, root_certificates=root_certificates, private_key=private_key, certificate_chain=certificate_chain, server_host_override=server_host_override)
 # @@protoc_insertion_point(module_scope)
diff --git a/src/python/interop/setup.py b/src/python/interop/setup.py
index 6db543509038bfccc77a02d7ce8af60be47c3b28..502fcbedd84293dd253832ce87534648395a08e1 100644
--- a/src/python/interop/setup.py
+++ b/src/python/interop/setup.py
@@ -29,7 +29,7 @@
 
 """A setup module for the GRPC Python interop testing package."""
 
-from distutils import core as _core
+import setuptools
 
 _PACKAGES = (
     'interop',
@@ -45,9 +45,13 @@ _PACKAGE_DATA = {
         'credentials/server1.pem',]
 }
 
-_INSTALL_REQUIRES = ['grpc-2015>=0.0.1']
+_INSTALL_REQUIRES = ['oauth2client>=1.4.7', 'grpcio>=0.4.0a4']
 
-_core.setup(
-    name='interop', version='0.0.1', packages=_PACKAGES,
-    package_dir=_PACKAGE_DIRECTORIES, package_data=_PACKAGE_DATA,
-    install_requires=_INSTALL_REQUIRES)
+setuptools.setup(
+    name='interop',
+    version='0.0.1',
+    packages=_PACKAGES,
+    package_dir=_PACKAGE_DIRECTORIES,
+    package_data=_PACKAGE_DATA,
+    install_requires=_INSTALL_REQUIRES
+)
diff --git a/src/python/src/.gitignore b/src/python/src/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..bc15a52cf1e1607a9a6526c6bbe1482a362f1819
--- /dev/null
+++ b/src/python/src/.gitignore
@@ -0,0 +1,3 @@
+MANIFEST
+grpcio.egg-info/
+dist/
diff --git a/src/python/src/MANIFEST.in b/src/python/src/MANIFEST.in
new file mode 100644
index 0000000000000000000000000000000000000000..6f32db054886930a1fdd6e799d6b14917bca1818
--- /dev/null
+++ b/src/python/src/MANIFEST.in
@@ -0,0 +1 @@
+graft grpc
diff --git a/src/python/src/README.rst b/src/python/src/README.rst
new file mode 100644
index 0000000000000000000000000000000000000000..bc1815febc39e27ec3c4ac307bba8b49f0d21157
--- /dev/null
+++ b/src/python/src/README.rst
@@ -0,0 +1,27 @@
+gRPC Python
+===========
+
+Package for GRPC Python.
+
+Dependencies
+------------
+
+Ensure that you have installed GRPC core.
+
+On debian linux systems, install from our released deb package:
+
+::
+
+  $ wget https://github.com/grpc/grpc/releases/download/release-0_5_0/libgrpc_0.5.0_amd64.deb
+  $ wget https://github.com/grpc/grpc/releases/download/release-0_5_0/libgrpc-dev_0.5.0_amd64.deb
+  $ sudo dpkg -i libgrpc_0.5.0_amd64.deb libgrpc-dev_0.5.0_amd64.deb
+
+Otherwise, install from source:
+
+::
+
+  git clone https://github.com/grpc/grpc.git
+  cd grpc
+  ./configure
+  make && make install
+
diff --git a/src/python/src/grpc/_adapter/_links_test.py b/src/python/src/grpc/_adapter/_links_test.py
index cfdcc2c4bc9c09edbeee7087f940f64e653725c9..4987be389a9cff003d8b62bef221e8d88737e55f 100644
--- a/src/python/src/grpc/_adapter/_links_test.py
+++ b/src/python/src/grpc/_adapter/_links_test.py
@@ -43,6 +43,14 @@ _IDENTITY = lambda x: x
 _TIMEOUT = 2
 
 
+# TODO(nathaniel): End-to-end metadata testing.
+def _transform_metadata(unused_metadata):
+  return (
+      ('one unused key', 'one unused value'),
+      ('another unused key', 'another unused value'),
+)
+
+
 class RoundTripTest(unittest.TestCase):
 
   def setUp(self):
@@ -76,7 +84,8 @@ class RoundTripTest(unittest.TestCase):
 
     rear_link = rear.RearLink(
         'localhost', port, self.rear_link_pool, {test_method: None},
-        {test_method: None}, False, None, None, None)
+        {test_method: None}, False, None, None, None,
+        metadata_transformer=_transform_metadata)
     rear_link.join_fore_link(test_fore_link)
     test_fore_link.join_rear_link(rear_link)
     rear_link.start()
diff --git a/src/python/src/grpc/_adapter/rear.py b/src/python/src/grpc/_adapter/rear.py
index f19321c4266d817c328cc7c54ef1c64cc3089d37..2b93aa633141f5230ef15f357ed6f664f28f07bb 100644
--- a/src/python/src/grpc/_adapter/rear.py
+++ b/src/python/src/grpc/_adapter/rear.py
@@ -93,7 +93,7 @@ class RearLink(base_interfaces.RearLink, activated.Activated):
   def __init__(
       self, host, port, pool, request_serializers, response_deserializers,
       secure, root_certificates, private_key, certificate_chain,
-      server_host_override=None):
+      metadata_transformer=None, server_host_override=None):
     """Constructor.
 
     Args:
@@ -111,6 +111,9 @@ class RearLink(base_interfaces.RearLink, activated.Activated):
         key should be used.
       certificate_chain: The PEM-encoded certificate chain to use or None if
         no certificate chain should be used.
+      metadata_transformer: A function that given a metadata object produces
+        another metadata to be used in the underlying communication on the
+        wire.
       server_host_override: (For testing only) the target name used for SSL
         host name checking.
     """
@@ -134,6 +137,7 @@ class RearLink(base_interfaces.RearLink, activated.Activated):
     self._root_certificates = root_certificates
     self._private_key = private_key
     self._certificate_chain = certificate_chain
+    self._metadata_transformer = metadata_transformer
     self._server_host_override = server_host_override
 
   def _on_write_event(self, operation_id, event, rpc_state):
@@ -243,6 +247,10 @@ class RearLink(base_interfaces.RearLink, activated.Activated):
     """
     request_serializer = self._request_serializers[name]
     call = _low.Call(self._channel, name, self._host, time.time() + timeout)
+    if self._metadata_transformer is not None:
+      metadata = self._metadata_transformer([])
+      for metadata_key, metadata_value in metadata:
+        call.add_metadata(metadata_key, metadata_value)
     call.invoke(self._completion_queue, operation_id, operation_id)
     outstanding = set(_INVOCATION_EVENT_KINDS)
 
diff --git a/src/python/src/grpc/early_adopter/implementations.py b/src/python/src/grpc/early_adopter/implementations.py
index 7d3d29f06ca36233913dada7ff7df911656bfddb..35456d38c6bb071d4bd0c786e0136cfe7d8cbe5b 100644
--- a/src/python/src/grpc/early_adopter/implementations.py
+++ b/src/python/src/grpc/early_adopter/implementations.py
@@ -114,7 +114,7 @@ class _Stub(interfaces.Stub):
 
   def __init__(
       self, breakdown, host, port, secure, root_certificates, private_key,
-      certificate_chain, server_host_override=None):
+      certificate_chain, metadata_transformer=None, server_host_override=None):
     self._lock = threading.Lock()
     self._breakdown = breakdown
     self._host = host
@@ -123,6 +123,7 @@ class _Stub(interfaces.Stub):
     self._root_certificates = root_certificates
     self._private_key = private_key
     self._certificate_chain = certificate_chain
+    self._metadata_transformer = metadata_transformer
     self._server_host_override = server_host_override
 
     self._pool = None
@@ -141,6 +142,7 @@ class _Stub(interfaces.Stub):
             self._breakdown.request_serializers,
             self._breakdown.response_deserializers, self._secure,
             self._root_certificates, self._private_key, self._certificate_chain,
+            metadata_transformer=self._metadata_transformer,
             server_host_override=self._server_host_override)
         self._front.join_rear_link(self._rear_link)
         self._rear_link.join_fore_link(self._front)
@@ -189,8 +191,9 @@ class _Stub(interfaces.Stub):
 
 
 def stub(
-    service_name, methods, host, port, secure=False, root_certificates=None,
-    private_key=None, certificate_chain=None, server_host_override=None):
+    service_name, methods, host, port, metadata_transformer=None, secure=False,
+    root_certificates=None, private_key=None, certificate_chain=None,
+    server_host_override=None):
   """Constructs an interfaces.Stub.
 
   Args:
@@ -201,6 +204,9 @@ def stub(
       not qualified by the service name or decorated in any other way.
     host: The host to which to connect for RPC service.
     port: The port to which to connect for RPC service.
+    metadata_transformer: A callable that given a metadata object produces
+      another metadata object to be used in the underlying communication on the
+      wire.
     secure: Whether or not to construct the stub with a secure connection.
     root_certificates: The PEM-encoded root certificates or None to ask for
       them to be retrieved from a default location.
diff --git a/src/python/src/setup.py b/src/python/src/setup.py
index bd70634b8fe72dbc952dc4f74c1db19fb21c97f0..32ac41e285685e509b86a7e6569078b5b5993018 100644
--- a/src/python/src/setup.py
+++ b/src/python/src/setup.py
@@ -30,6 +30,8 @@
 """A setup module for the GRPC Python package."""
 
 from distutils import core as _core
+import setuptools
+import sys
 
 _EXTENSION_SOURCES = (
     'grpc/_adapter/_c.c',
@@ -49,8 +51,9 @@ _EXTENSION_INCLUDE_DIRECTORIES = (
 _EXTENSION_LIBRARIES = (
     'grpc',
     'gpr',
-    'rt',
 )
+if not "darwin" in sys.platform:
+    _EXTENSION_LIBRARIES += ('rt',)
 
 _EXTENSION_MODULE = _core.Extension(
     'grpc._adapter._c', sources=list(_EXTENSION_SOURCES),
@@ -80,7 +83,15 @@ _PACKAGE_DIRECTORIES = {
     'grpc.framework': 'grpc/framework',
 }
 
-_core.setup(
-    name='grpc-2015', version='0.4.0',
-    ext_modules=[_EXTENSION_MODULE], packages=list(_PACKAGES),
-    package_dir=_PACKAGE_DIRECTORIES)
+setuptools.setup(
+    name='grpcio',
+    version='0.5.0a0',
+    ext_modules=[_EXTENSION_MODULE],
+    packages=list(_PACKAGES),
+    package_dir=_PACKAGE_DIRECTORIES,
+    install_requires=[
+        'enum34==1.0.4',
+        'futures==2.2.0',
+        'protobuf==3.0.0-alpha-1'
+    ]
+)
diff --git a/src/ruby/ext/grpc/rb_byte_buffer.c b/src/ruby/ext/grpc/rb_byte_buffer.c
index ff5a114de58048c78250f61a74f5d1533b63fac3..e3a5277f54420cdc082ba7392f10da74ccb2a501 100644
--- a/src/ruby/ext/grpc/rb_byte_buffer.c
+++ b/src/ruby/ext/grpc/rb_byte_buffer.c
@@ -39,203 +39,29 @@
 #include <grpc/support/slice.h>
 #include "rb_grpc.h"
 
-/* grpc_rb_byte_buffer wraps a grpc_byte_buffer.  It provides a peer ruby
- * object, 'mark' to minimize copying when a byte_buffer is created from
- * ruby. */
-typedef struct grpc_rb_byte_buffer {
-  /* Holder of ruby objects involved in constructing the status */
-  VALUE mark;
-  /* The actual status */
-  grpc_byte_buffer *wrapped;
-} grpc_rb_byte_buffer;
-
-/* Destroys ByteBuffer instances. */
-static void grpc_rb_byte_buffer_free(void *p) {
-  grpc_rb_byte_buffer *bb = NULL;
-  if (p == NULL) {
-    return;
-  };
-  bb = (grpc_rb_byte_buffer *)p;
-
-  /* Deletes the wrapped object if the mark object is Qnil, which indicates
-   * that no other object is the actual owner. */
-  if (bb->wrapped != NULL && bb->mark == Qnil) {
-    grpc_byte_buffer_destroy(bb->wrapped);
-  }
-
-  xfree(p);
-}
-
-/* Protects the mark object from GC */
-static void grpc_rb_byte_buffer_mark(void *p) {
-  grpc_rb_byte_buffer *bb = NULL;
-  if (p == NULL) {
-    return;
-  }
-  bb = (grpc_rb_byte_buffer *)p;
-
-  /* If it's not already cleaned up, mark the mark object */
-  if (bb->mark != Qnil && BUILTIN_TYPE(bb->mark) != T_NONE) {
-    rb_gc_mark(bb->mark);
-  }
+grpc_byte_buffer* grpc_rb_s_to_byte_buffer(char *string, size_t length) {
+  gpr_slice slice = gpr_slice_from_copied_buffer(string, length);
+  grpc_byte_buffer *buffer = grpc_byte_buffer_create(&slice, 1);
+  gpr_slice_unref(slice);
+  return buffer;
 }
 
-/* id_source is the name of the hidden ivar the preserves the original
- * byte_buffer source string */
-static ID id_source;
-
-/* Allocates ByteBuffer instances.
-
-   Provides safe default values for the byte_buffer fields. */
-static VALUE grpc_rb_byte_buffer_alloc(VALUE cls) {
-  grpc_rb_byte_buffer *wrapper = ALLOC(grpc_rb_byte_buffer);
-  wrapper->wrapped = NULL;
-  wrapper->mark = Qnil;
-  return Data_Wrap_Struct(cls, grpc_rb_byte_buffer_mark,
-                          grpc_rb_byte_buffer_free, wrapper);
-}
-
-/* Clones ByteBuffer instances.
-
-   Gives ByteBuffer a consistent implementation of Ruby's object copy/dup
-   protocol. */
-static VALUE grpc_rb_byte_buffer_init_copy(VALUE copy, VALUE orig) {
-  grpc_rb_byte_buffer *orig_bb = NULL;
-  grpc_rb_byte_buffer *copy_bb = NULL;
-
-  if (copy == orig) {
-    return copy;
-  }
-
-  /* Raise an error if orig is not a metadata object or a subclass. */
-  if (TYPE(orig) != T_DATA ||
-      RDATA(orig)->dfree != (RUBY_DATA_FUNC)grpc_rb_byte_buffer_free) {
-    rb_raise(rb_eTypeError, "not a %s", rb_obj_classname(rb_cByteBuffer));
-  }
-
-  Data_Get_Struct(orig, grpc_rb_byte_buffer, orig_bb);
-  Data_Get_Struct(copy, grpc_rb_byte_buffer, copy_bb);
-
-  /* use ruby's MEMCPY to make a byte-for-byte copy of the metadata wrapper
-   * object. */
-  MEMCPY(copy_bb, orig_bb, grpc_rb_byte_buffer, 1);
-  return copy;
-}
-
-/* id_empty is used to return the empty string from to_s when necessary. */
-static ID id_empty;
-
-static VALUE grpc_rb_byte_buffer_to_s(VALUE self) {
-  grpc_rb_byte_buffer *wrapper = NULL;
-  grpc_byte_buffer *bb = NULL;
-  grpc_byte_buffer_reader *reader = NULL;
-  char *output = NULL;
+VALUE grpc_rb_byte_buffer_to_s(grpc_byte_buffer *buffer) {
   size_t length = 0;
+  char *string = NULL;
   size_t offset = 0;
-  VALUE output_obj = Qnil;
+  grpc_byte_buffer_reader *reader = NULL;
   gpr_slice next;
+  if (buffer == NULL) {
+    return Qnil;
 
-  Data_Get_Struct(self, grpc_rb_byte_buffer, wrapper);
-  output_obj = rb_ivar_get(wrapper->mark, id_source);
-  if (output_obj != Qnil) {
-    /* From ruby, ByteBuffers are immutable so if a source is set, return that
-     * as the to_s value */
-    return output_obj;
-  }
-
-  /* Read the bytes. */
-  bb = wrapper->wrapped;
-  if (bb == NULL) {
-    return rb_id2str(id_empty);
-  }
-  length = grpc_byte_buffer_length(bb);
-  if (length == 0) {
-    return rb_id2str(id_empty);
   }
-  reader = grpc_byte_buffer_reader_create(bb);
-  output = xmalloc(length);
+  length = grpc_byte_buffer_length(buffer);
+  string = xmalloc(length + 1);
+  reader = grpc_byte_buffer_reader_create(buffer);
   while (grpc_byte_buffer_reader_next(reader, &next) != 0) {
-    memcpy(output + offset, GPR_SLICE_START_PTR(next), GPR_SLICE_LENGTH(next));
+    memcpy(string + offset, GPR_SLICE_START_PTR(next), GPR_SLICE_LENGTH(next));
     offset += GPR_SLICE_LENGTH(next);
   }
-  output_obj = rb_str_new(output, length);
-
-  /* Save a references to the computed string in the mark object so that the
-   * calling to_s does not do any allocations. */
-  wrapper->mark = rb_class_new_instance(0, NULL, rb_cObject);
-  rb_ivar_set(wrapper->mark, id_source, output_obj);
-
-  return output_obj;
-}
-
-/* Initializes ByteBuffer instances. */
-static VALUE grpc_rb_byte_buffer_init(VALUE self, VALUE src) {
-  gpr_slice a_slice;
-  grpc_rb_byte_buffer *wrapper = NULL;
-  grpc_byte_buffer *byte_buffer = NULL;
-
-  if (TYPE(src) != T_STRING) {
-    rb_raise(rb_eTypeError, "bad byte_buffer arg: got <%s>, want <String>",
-             rb_obj_classname(src));
-    return Qnil;
-  }
-  Data_Get_Struct(self, grpc_rb_byte_buffer, wrapper);
-  a_slice = gpr_slice_malloc(RSTRING_LEN(src));
-  memcpy(GPR_SLICE_START_PTR(a_slice), RSTRING_PTR(src), RSTRING_LEN(src));
-  byte_buffer = grpc_byte_buffer_create(&a_slice, 1);
-  gpr_slice_unref(a_slice);
-
-  if (byte_buffer == NULL) {
-    rb_raise(rb_eArgError, "could not create a byte_buffer, not sure why");
-    return Qnil;
-  }
-  wrapper->wrapped = byte_buffer;
-
-  /* Save a references to the original string in the mark object so that the
-   * pointers used there is valid for the lifetime of the object. */
-  wrapper->mark = rb_class_new_instance(0, NULL, rb_cObject);
-  rb_ivar_set(wrapper->mark, id_source, src);
-
-  return self;
-}
-
-/* rb_cByteBuffer is the ruby class that proxies grpc_byte_buffer. */
-VALUE rb_cByteBuffer = Qnil;
-
-void Init_grpc_byte_buffer() {
-  rb_cByteBuffer =
-      rb_define_class_under(rb_mGrpcCore, "ByteBuffer", rb_cObject);
-
-  /* Allocates an object managed by the ruby runtime */
-  rb_define_alloc_func(rb_cByteBuffer, grpc_rb_byte_buffer_alloc);
-
-  /* Provides a ruby constructor and support for dup/clone. */
-  rb_define_method(rb_cByteBuffer, "initialize", grpc_rb_byte_buffer_init, 1);
-  rb_define_method(rb_cByteBuffer, "initialize_copy",
-                   grpc_rb_byte_buffer_init_copy, 1);
-
-  /* Provides a to_s method that returns the buffer value */
-  rb_define_method(rb_cByteBuffer, "to_s", grpc_rb_byte_buffer_to_s, 0);
-
-  id_source = rb_intern("__source");
-  id_empty = rb_intern("");
-}
-
-VALUE grpc_rb_byte_buffer_create_with_mark(VALUE mark, grpc_byte_buffer *bb) {
-  grpc_rb_byte_buffer *byte_buffer = NULL;
-  if (bb == NULL) {
-    return Qnil;
-  }
-  byte_buffer = ALLOC(grpc_rb_byte_buffer);
-  byte_buffer->wrapped = bb;
-  byte_buffer->mark = mark;
-  return Data_Wrap_Struct(rb_cByteBuffer, grpc_rb_byte_buffer_mark,
-                          grpc_rb_byte_buffer_free, byte_buffer);
-}
-
-/* Gets the wrapped byte_buffer from the ruby wrapper */
-grpc_byte_buffer *grpc_rb_get_wrapped_byte_buffer(VALUE v) {
-  grpc_rb_byte_buffer *wrapper = NULL;
-  Data_Get_Struct(v, grpc_rb_byte_buffer, wrapper);
-  return wrapper->wrapped;
+  return rb_str_new(string, length);
 }
diff --git a/src/ruby/ext/grpc/rb_byte_buffer.h b/src/ruby/ext/grpc/rb_byte_buffer.h
index 6ef72f3e757fe2137acacb6159af4229c74ee0cb..96b9009dae99612694669daf3b217c52d1f953f1 100644
--- a/src/ruby/ext/grpc/rb_byte_buffer.h
+++ b/src/ruby/ext/grpc/rb_byte_buffer.h
@@ -37,18 +37,10 @@
 #include <grpc/grpc.h>
 #include <ruby.h>
 
-/* rb_cByteBuffer is the ByteBuffer class whose instances proxy
-   grpc_byte_buffer. */
-extern VALUE rb_cByteBuffer;
+/* Converts a char* with a length to a grpc_byte_buffer */
+grpc_byte_buffer *grpc_rb_s_to_byte_buffer(char *string, size_t length);
 
-/* Initializes the ByteBuffer class. */
-void Init_grpc_byte_buffer();
-
-/* grpc_rb_byte_buffer_create_with_mark creates a grpc_rb_byte_buffer with a
- * ruby mark object that will be kept alive while the byte_buffer is alive. */
-VALUE grpc_rb_byte_buffer_create_with_mark(VALUE mark, grpc_byte_buffer* bb);
-
-/* Gets the wrapped byte_buffer from its ruby object. */
-grpc_byte_buffer* grpc_rb_get_wrapped_byte_buffer(VALUE v);
+/* Converts a grpc_byte_buffer to a ruby string */
+VALUE grpc_rb_byte_buffer_to_s(grpc_byte_buffer *buffer);
 
 #endif /* GRPC_RB_BYTE_BUFFER_H_ */
diff --git a/src/ruby/ext/grpc/rb_call.c b/src/ruby/ext/grpc/rb_call.c
index b5a256d5a67d4b79ff6b8ab342506932761eff32..18cb4ec4f2b8359ae67e4f0f0571802dc4dcaf4c 100644
--- a/src/ruby/ext/grpc/rb_call.c
+++ b/src/ruby/ext/grpc/rb_call.c
@@ -36,11 +36,19 @@
 #include <ruby.h>
 
 #include <grpc/grpc.h>
+#include <grpc/support/alloc.h>
+
 #include "rb_byte_buffer.h"
 #include "rb_completion_queue.h"
-#include "rb_metadata.h"
 #include "rb_grpc.h"
 
+/* rb_sBatchResult is struct class used to hold the results of a batch call */
+static VALUE rb_sBatchResult;
+
+/* rb_cMdAry is the MetadataArray class whose instances proxy
+ * grpc_metadata_array. */
+static VALUE rb_cMdAry;
+
 /* id_cq is the name of the hidden ivar that preserves a reference to a
  * completion queue */
 static ID id_cq;
@@ -62,6 +70,15 @@ static ID id_metadata;
  * received by the call and subsequently saved on it. */
 static ID id_status;
 
+/* sym_* are the symbol for attributes of rb_sBatchResult. */
+static VALUE sym_send_message;
+static VALUE sym_send_metadata;
+static VALUE sym_send_close;
+static VALUE sym_send_status;
+static VALUE sym_message;
+static VALUE sym_status;
+static VALUE sym_cancelled;
+
 /* hash_all_calls is a hash of Call address -> reference count that is used to
  * track the creation and destruction of rb_call instances.
  */
@@ -101,84 +118,6 @@ const char *grpc_call_error_detail_of(grpc_call_error err) {
   return detail;
 }
 
-/* grpc_rb_call_add_metadata_hash_cb is the hash iteration callback used by
-   grpc_rb_call_add_metadata.
-*/
-int grpc_rb_call_add_metadata_hash_cb(VALUE key, VALUE val, VALUE call_obj) {
-  grpc_call *call = NULL;
-  grpc_metadata *md = NULL;
-  VALUE md_obj = Qnil;
-  VALUE md_obj_args[2];
-  VALUE flags = rb_ivar_get(call_obj, id_flags);
-  grpc_call_error err;
-  int array_length;
-  int i;
-
-  /* Construct a metadata object from key and value and add it */
-  Data_Get_Struct(call_obj, grpc_call, call);
-  md_obj_args[0] = key;
-
-  if (TYPE(val) == T_ARRAY) {
-    /* If the value is an array, add each value in the array separately */
-    array_length = RARRAY_LEN(val);
-    for (i = 0; i < array_length; i++) {
-      md_obj_args[1] = rb_ary_entry(val, i);
-      md_obj = rb_class_new_instance(2, md_obj_args, rb_cMetadata);
-      md = grpc_rb_get_wrapped_metadata(md_obj);
-      err = grpc_call_add_metadata_old(call, md, NUM2UINT(flags));
-      if (err != GRPC_CALL_OK) {
-        rb_raise(rb_eCallError, "add metadata failed: %s (code=%d)",
-                 grpc_call_error_detail_of(err), err);
-        return ST_STOP;
-      }
-    }
-  } else {
-    md_obj_args[1] = val;
-    md_obj = rb_class_new_instance(2, md_obj_args, rb_cMetadata);
-    md = grpc_rb_get_wrapped_metadata(md_obj);
-    err = grpc_call_add_metadata_old(call, md, NUM2UINT(flags));
-    if (err != GRPC_CALL_OK) {
-      rb_raise(rb_eCallError, "add metadata failed: %s (code=%d)",
-               grpc_call_error_detail_of(err), err);
-      return ST_STOP;
-    }
-  }
-
-  return ST_CONTINUE;
-}
-
-/*
-  call-seq:
-     call.add_metadata(completion_queue, hash_elements, flags=nil)
-
-  Add metadata elements to the call from a ruby hash, to be sent upon
-  invocation. flags is a bit-field combination of the write flags defined
-  above.  REQUIRES: grpc_call_invoke/grpc_call_accept have not been
-  called on this call.  Produces no events. */
-
-static VALUE grpc_rb_call_add_metadata(int argc, VALUE *argv, VALUE self) {
-  VALUE metadata;
-  VALUE flags = Qnil;
-  ID id_size = rb_intern("size");
-
-  /* "11" == 1 mandatory args, 1 (flags) is optional */
-  rb_scan_args(argc, argv, "11", &metadata, &flags);
-  if (NIL_P(flags)) {
-    flags = UINT2NUM(0); /* Default to no flags */
-  }
-  if (TYPE(metadata) != T_HASH) {
-    rb_raise(rb_eTypeError, "add metadata failed: metadata should be a hash");
-    return Qnil;
-  }
-  if (NUM2UINT(rb_funcall(metadata, id_size, 0)) == 0) {
-    return Qnil;
-  }
-  rb_ivar_set(self, id_flags, flags);
-  rb_ivar_set(self, id_input_md, metadata);
-  rb_hash_foreach(metadata, grpc_rb_call_add_metadata_hash_cb, self);
-  return Qnil;
-}
-
 /* Called by clients to cancel an RPC on the server.
    Can be called multiple times, from any thread. */
 static VALUE grpc_rb_call_cancel(VALUE self) {
@@ -196,75 +135,18 @@ static VALUE grpc_rb_call_cancel(VALUE self) {
 
 /*
   call-seq:
-     call.invoke(completion_queue, tag, flags=nil)
-
-   Invoke the RPC. Starts sending metadata and request headers on the wire.
-   flags is a bit-field combination of the write flags defined above.
-   REQUIRES: Can be called at most once per call.
-             Can only be called on the client.
-   Produces a GRPC_INVOKE_ACCEPTED event on completion. */
-static VALUE grpc_rb_call_invoke(int argc, VALUE *argv, VALUE self) {
-  VALUE cqueue = Qnil;
-  VALUE metadata_read_tag = Qnil;
-  VALUE finished_tag = Qnil;
-  VALUE flags = Qnil;
-  grpc_call *call = NULL;
-  grpc_completion_queue *cq = NULL;
-  grpc_call_error err;
+  status = call.status
 
-  /* "31" == 3 mandatory args, 1 (flags) is optional */
-  rb_scan_args(argc, argv, "31", &cqueue, &metadata_read_tag, &finished_tag,
-               &flags);
-  if (NIL_P(flags)) {
-    flags = UINT2NUM(0); /* Default to no flags */
-  }
-  cq = grpc_rb_get_wrapped_completion_queue(cqueue);
-  Data_Get_Struct(self, grpc_call, call);
-  err = grpc_call_invoke_old(call, cq, ROBJECT(metadata_read_tag),
-                             ROBJECT(finished_tag), NUM2UINT(flags));
-  if (err != GRPC_CALL_OK) {
-    rb_raise(rb_eCallError, "invoke failed: %s (code=%d)",
-             grpc_call_error_detail_of(err), err);
-  }
-
-  /* Add the completion queue as an instance attribute, prevents it from being
-   * GCed until this call object is GCed */
-  rb_ivar_set(self, id_cq, cqueue);
-
-  return Qnil;
-}
-
-/* Initiate a read on a call. Output event contains a byte buffer with the
-   result of the read.
-   REQUIRES: No other reads are pending on the call. It is only safe to start
-   the next read after the corresponding read event is received. */
-static VALUE grpc_rb_call_start_read(VALUE self, VALUE tag) {
-  grpc_call *call = NULL;
-  grpc_call_error err;
-  Data_Get_Struct(self, grpc_call, call);
-  err = grpc_call_start_read_old(call, ROBJECT(tag));
-  if (err != GRPC_CALL_OK) {
-    rb_raise(rb_eCallError, "start read failed: %s (code=%d)",
-             grpc_call_error_detail_of(err), err);
-  }
-
-  return Qnil;
-}
-
-/*
-  call-seq:
-    status = call.status
-
-    Gets the status object saved the call.  */
+  Gets the status object saved the call.  */
 static VALUE grpc_rb_call_get_status(VALUE self) {
   return rb_ivar_get(self, id_status);
 }
 
 /*
   call-seq:
-    call.status = status
+  call.status = status
 
-    Saves a status object on the call.  */
+  Saves a status object on the call.  */
 static VALUE grpc_rb_call_set_status(VALUE self, VALUE status) {
   if (!NIL_P(status) && rb_obj_class(status) != rb_sStatus) {
     rb_raise(rb_eTypeError, "bad status: got:<%s> want: <Struct::Status>",
@@ -277,18 +159,18 @@ static VALUE grpc_rb_call_set_status(VALUE self, VALUE status) {
 
 /*
   call-seq:
-    metadata = call.metadata
+  metadata = call.metadata
 
-    Gets the metadata object saved the call.  */
+  Gets the metadata object saved the call.  */
 static VALUE grpc_rb_call_get_metadata(VALUE self) {
   return rb_ivar_get(self, id_metadata);
 }
 
 /*
   call-seq:
-    call.metadata = metadata
+  call.metadata = metadata
 
-    Saves the metadata hash on the call.  */
+  Saves the metadata hash on the call.  */
 static VALUE grpc_rb_call_set_metadata(VALUE self, VALUE metadata) {
   if (!NIL_P(metadata) && TYPE(metadata) != T_HASH) {
     rb_raise(rb_eTypeError, "bad metadata: got:<%s> want: <Hash>",
@@ -299,147 +181,402 @@ static VALUE grpc_rb_call_set_metadata(VALUE self, VALUE metadata) {
   return rb_ivar_set(self, id_metadata, metadata);
 }
 
-/*
-  call-seq:
-     call.start_write(byte_buffer, tag, flags=nil)
-
-   Queue a byte buffer for writing.
-   flags is a bit-field combination of the write flags defined above.
-   A write with byte_buffer null is allowed, and will not send any bytes on the
-   wire. If this is performed without GRPC_WRITE_BUFFER_HINT flag it provides
-   a mechanism to flush any previously buffered writes to outgoing flow control.
-   REQUIRES: No other writes are pending on the call. It is only safe to
-             start the next write after the corresponding write_accepted event
-             is received.
-             GRPC_INVOKE_ACCEPTED must have been received by the application
-             prior to calling this on the client. On the server,
-             grpc_call_accept must have been called successfully.
-   Produces a GRPC_WRITE_ACCEPTED event. */
-static VALUE grpc_rb_call_start_write(int argc, VALUE *argv, VALUE self) {
-  VALUE byte_buffer = Qnil;
-  VALUE tag = Qnil;
-  VALUE flags = Qnil;
-  grpc_call *call = NULL;
-  grpc_byte_buffer *bfr = NULL;
-  grpc_call_error err;
+/* grpc_rb_md_ary_fill_hash_cb is the hash iteration callback used
+   to fill grpc_metadata_array.
+
+   it's capacity should have been computed via a prior call to
+   grpc_rb_md_ary_fill_hash_cb
+*/
+int grpc_rb_md_ary_fill_hash_cb(VALUE key, VALUE val, VALUE md_ary_obj) {
+  grpc_metadata_array *md_ary = NULL;
+  int array_length;
+  int i;
+
+  /* Construct a metadata object from key and value and add it */
+  Data_Get_Struct(md_ary_obj, grpc_metadata_array, md_ary);
 
-  /* "21" == 2 mandatory args, 1 (flags) is optional */
-  rb_scan_args(argc, argv, "21", &byte_buffer, &tag, &flags);
-  if (NIL_P(flags)) {
-    flags = UINT2NUM(0); /* Default to no flags */
+  if (TYPE(val) == T_ARRAY) {
+    /* If the value is an array, add capacity for each value in the array */
+    array_length = RARRAY_LEN(val);
+    for (i = 0; i < array_length; i++) {
+      if (TYPE(key) == T_SYMBOL) {
+        md_ary->metadata[md_ary->count].key = (char *)rb_id2name(SYM2ID(key));
+      } else { /* StringValueCStr does all other type exclusions for us */
+        md_ary->metadata[md_ary->count].key = StringValueCStr(key);
+      }
+      md_ary->metadata[md_ary->count].value = RSTRING_PTR(rb_ary_entry(val, i));
+      md_ary->metadata[md_ary->count].value_length =
+        RSTRING_LEN(rb_ary_entry(val, i));
+      md_ary->count += 1;
+    }
+  } else {
+    if (TYPE(key) == T_SYMBOL) {
+      md_ary->metadata[md_ary->count].key = (char *)rb_id2name(SYM2ID(key));
+    } else { /* StringValueCStr does all other type exclusions for us */
+      md_ary->metadata[md_ary->count].key = StringValueCStr(key);
+    }
+    md_ary->metadata[md_ary->count].value = RSTRING_PTR(val);
+    md_ary->metadata[md_ary->count].value_length = RSTRING_LEN(val);
+    md_ary->count += 1;
   }
-  bfr = grpc_rb_get_wrapped_byte_buffer(byte_buffer);
-  Data_Get_Struct(self, grpc_call, call);
-  err = grpc_call_start_write_old(call, bfr, ROBJECT(tag), NUM2UINT(flags));
-  if (err != GRPC_CALL_OK) {
-    rb_raise(rb_eCallError, "start write failed: %s (code=%d)",
-             grpc_call_error_detail_of(err), err);
+
+  return ST_CONTINUE;
+}
+
+/* grpc_rb_md_ary_capacity_hash_cb is the hash iteration callback used
+   to pre-compute the capacity a grpc_metadata_array.
+*/
+int grpc_rb_md_ary_capacity_hash_cb(VALUE key, VALUE val, VALUE md_ary_obj) {
+  grpc_metadata_array *md_ary = NULL;
+
+  /* Construct a metadata object from key and value and add it */
+  Data_Get_Struct(md_ary_obj, grpc_metadata_array, md_ary);
+
+  if (TYPE(val) == T_ARRAY) {
+    /* If the value is an array, add capacity for each value in the array */
+    md_ary->capacity += RARRAY_LEN(val);
+  } else {
+    md_ary->capacity += 1;
+  }
+  return ST_CONTINUE;
+}
+
+/* grpc_rb_md_ary_convert converts a ruby metadata hash into
+   a grpc_metadata_array.
+*/
+void grpc_rb_md_ary_convert(VALUE md_ary_hash, grpc_metadata_array *md_ary) {
+  VALUE md_ary_obj = Qnil;
+  if (md_ary_hash == Qnil) {
+    return;  /* Do nothing if the expected has value is nil */
+  }
+  if (TYPE(md_ary_hash) != T_HASH) {
+    rb_raise(rb_eTypeError, "md_ary_convert: got <%s>, want <Hash>",
+             rb_obj_classname(md_ary_hash));
+    return;
   }
 
-  return Qnil;
+  /* Initialize the array, compute it's capacity, then fill it. */
+  grpc_metadata_array_init(md_ary);
+  md_ary_obj = Data_Wrap_Struct(rb_cMdAry, GC_NOT_MARKED, GC_DONT_FREE, md_ary);
+  rb_hash_foreach(md_ary_hash, grpc_rb_md_ary_capacity_hash_cb, md_ary_obj);
+  md_ary->metadata = gpr_malloc(md_ary->capacity * sizeof(grpc_metadata));
+  rb_hash_foreach(md_ary_hash, grpc_rb_md_ary_fill_hash_cb, md_ary_obj);
 }
 
-/* Queue a status for writing.
-
-   call-seq:
-      tag = Object.new
-      call.write_status(200, "OK", tag)
-
-   REQUIRES: No other writes are pending on the call. It is only safe to
-   start the next write after the corresponding write_accepted event
-   is received.
-   GRPC_INVOKE_ACCEPTED must have been received by the application
-   prior to calling this.
-   Only callable on the server.
-   Produces a GRPC_FINISHED event when the status is sent and the stream is
-   fully closed */
-static VALUE grpc_rb_call_start_write_status(VALUE self, VALUE code,
-                                             VALUE status, VALUE tag) {
-  grpc_call *call = NULL;
-  grpc_call_error err;
-  Data_Get_Struct(self, grpc_call, call);
-  err = grpc_call_start_write_status_old(call, NUM2UINT(code),
-                                         StringValueCStr(status), ROBJECT(tag));
-  if (err != GRPC_CALL_OK) {
-    rb_raise(rb_eCallError, "start write status: %s (code=%d)",
-             grpc_call_error_detail_of(err), err);
+/* Converts a metadata array to a hash. */
+VALUE grpc_rb_md_ary_to_h(grpc_metadata_array *md_ary) {
+  VALUE key = Qnil;
+  VALUE new_ary = Qnil;
+  VALUE value = Qnil;
+  VALUE result = rb_hash_new();
+  size_t i;
+
+  for (i = 0; i < md_ary->count; i++) {
+    key = rb_str_new2(md_ary->metadata[i].key);
+    value = rb_hash_aref(result, key);
+    if (value == Qnil) {
+      value = rb_str_new(md_ary->metadata[i].value,
+                         md_ary->metadata[i].value_length);
+      rb_hash_aset(result, key, value);
+    } else if (TYPE(value) == T_ARRAY) {
+      /* Add the string to the returned array */
+      rb_ary_push(value,
+                  rb_str_new(md_ary->metadata[i].value,
+                             md_ary->metadata[i].value_length));
+    } else {
+      /* Add the current value with this key and the new one to an array */
+      new_ary = rb_ary_new();
+      rb_ary_push(new_ary, value);
+      rb_ary_push(new_ary,
+                  rb_str_new(md_ary->metadata[i].value,
+                             md_ary->metadata[i].value_length));
+      rb_hash_aset(result, key, new_ary);
+    }
   }
+  return result;
+}
 
-  return Qnil;
+/* grpc_rb_call_check_op_keys_hash_cb is a hash iteration func that checks
+   each key of an ops hash is valid.
+*/
+int grpc_rb_call_check_op_keys_hash_cb(VALUE key, VALUE val, VALUE ops_ary) {
+  /* Update the capacity; the value is an array, add capacity for each value in
+   * the array */
+  if (TYPE(key) != T_FIXNUM) {
+    rb_raise(rb_eTypeError, "invalid operation : got <%s>, want <Fixnum>",
+             rb_obj_classname(key));
+    return ST_STOP;
+  }
+  switch(NUM2INT(key)) {
+    case GRPC_OP_SEND_INITIAL_METADATA:
+    case GRPC_OP_SEND_MESSAGE:
+    case GRPC_OP_SEND_CLOSE_FROM_CLIENT:
+    case GRPC_OP_SEND_STATUS_FROM_SERVER:
+    case GRPC_OP_RECV_INITIAL_METADATA:
+    case GRPC_OP_RECV_MESSAGE:
+    case GRPC_OP_RECV_STATUS_ON_CLIENT:
+    case GRPC_OP_RECV_CLOSE_ON_SERVER:
+      rb_ary_push(ops_ary, key);
+      return ST_CONTINUE;
+    default:
+      rb_raise(rb_eTypeError, "invalid operation : bad value %d",
+               NUM2INT(key));
+  };
+  return ST_STOP;
 }
 
-/* No more messages to send.
-   REQUIRES: No other writes are pending on the call. */
-static VALUE grpc_rb_call_writes_done(VALUE self, VALUE tag) {
-  grpc_call *call = NULL;
-  grpc_call_error err;
-  Data_Get_Struct(self, grpc_call, call);
-  err = grpc_call_writes_done_old(call, ROBJECT(tag));
-  if (err != GRPC_CALL_OK) {
-    rb_raise(rb_eCallError, "writes done: %s (code=%d)",
-             grpc_call_error_detail_of(err), err);
+/* grpc_rb_op_update_status_from_server adds the values in a ruby status
+   struct to the 'send_status_from_server' portion of an op.
+*/
+void grpc_rb_op_update_status_from_server(grpc_op *op,
+                                          grpc_metadata_array* md_ary,
+                                          VALUE status) {
+  VALUE code = rb_struct_aref(status, sym_code);
+  VALUE details = rb_struct_aref(status, sym_details);
+  VALUE metadata_hash = rb_struct_aref(status, sym_metadata);
+
+  /* TODO: add check to ensure status is the correct struct type */
+  if (TYPE(code) != T_FIXNUM) {
+    rb_raise(rb_eTypeError, "invalid code : got <%s>, want <Fixnum>",
+             rb_obj_classname(code));
+    return;
+  }
+  if (TYPE(details) != T_STRING) {
+    rb_raise(rb_eTypeError, "invalid details : got <%s>, want <String>",
+             rb_obj_classname(code));
+    return;
   }
+  op->data.send_status_from_server.status = NUM2INT(code);
+  op->data.send_status_from_server.status_details = StringValueCStr(details);
+  grpc_rb_md_ary_convert(metadata_hash, md_ary);
+  op->data.send_status_from_server.trailing_metadata_count = md_ary->count;
+  op->data.send_status_from_server.trailing_metadata = md_ary->metadata;
+}
 
-  return Qnil;
+/* run_batch_stack holds various values used by the
+ * grpc_rb_call_run_batch function */
+typedef struct run_batch_stack {
+  /* The batch ops */
+  grpc_op ops[8];  /* 8 is the maximum number of operations */
+  size_t op_num;   /* tracks the last added operation */
+
+  /* Data being sent */
+  grpc_metadata_array send_metadata;
+  grpc_metadata_array send_trailing_metadata;
+
+  /* Data being received */
+  grpc_byte_buffer *recv_message;
+  grpc_metadata_array recv_metadata;
+  grpc_metadata_array recv_trailing_metadata;
+  int recv_cancelled;
+  grpc_status_code recv_status;
+  char *recv_status_details;
+  size_t recv_status_details_capacity;
+} run_batch_stack;
+
+/* grpc_run_batch_stack_init ensures the run_batch_stack is properly
+ * initialized */
+static void grpc_run_batch_stack_init(run_batch_stack* st) {
+  MEMZERO(st, run_batch_stack, 1);
+  grpc_metadata_array_init(&st->send_metadata);
+  grpc_metadata_array_init(&st->send_trailing_metadata);
+  grpc_metadata_array_init(&st->recv_metadata);
+  grpc_metadata_array_init(&st->recv_trailing_metadata);
+  st->op_num = 0;
 }
 
-/* call-seq:
-     call.server_end_initial_metadata(flag)
-
-   Only to be called on servers, before sending messages.
-   flags is a bit-field combination of the write flags defined above.
-
-   REQUIRES: Can be called at most once per call.
-             Can only be called on the server, must be called after
-             grpc_call_server_accept
-   Produces no events */
-static VALUE grpc_rb_call_server_end_initial_metadata(int argc, VALUE *argv,
-                                                      VALUE self) {
-  VALUE flags = Qnil;
-  grpc_call *call = NULL;
-  grpc_call_error err;
+/* grpc_run_batch_stack_cleanup ensures the run_batch_stack is properly
+ * cleaned up */
+static void grpc_run_batch_stack_cleanup(run_batch_stack* st) {
+  grpc_metadata_array_destroy(&st->send_metadata);
+  grpc_metadata_array_destroy(&st->send_trailing_metadata);
+  grpc_metadata_array_destroy(&st->recv_metadata);
+  grpc_metadata_array_destroy(&st->recv_trailing_metadata);
+  if (st->recv_status_details != NULL) {
+    gpr_free(st->recv_status_details);
+  }
+}
 
-  /* "01" == 1 (flags) is optional */
-  rb_scan_args(argc, argv, "01", &flags);
-  if (NIL_P(flags)) {
-    flags = UINT2NUM(0); /* Default to no flags */
+/* grpc_run_batch_stack_fill_ops fills the run_batch_stack ops array from
+ * ops_hash */
+static void grpc_run_batch_stack_fill_ops(run_batch_stack* st, VALUE ops_hash) {
+  VALUE this_op = Qnil;
+  VALUE this_value = Qnil;
+  VALUE ops_ary = rb_ary_new();
+  size_t i = 0;
+
+  /* Create a ruby array with just the operation keys */
+  rb_hash_foreach(ops_hash, grpc_rb_call_check_op_keys_hash_cb, ops_ary);
+
+  /* Fill the ops array */
+  for (i = 0; i < (size_t)RARRAY_LEN(ops_ary); i++) {
+    this_op = rb_ary_entry(ops_ary, i);
+    this_value = rb_hash_aref(ops_hash, this_op);
+    switch(NUM2INT(this_op)) {
+      case GRPC_OP_SEND_INITIAL_METADATA:
+        /* N.B. later there is no need to explicitly delete the metadata keys
+         * and values, they are references to data in ruby objects. */
+        grpc_rb_md_ary_convert(this_value, &st->send_metadata);
+        st->ops[st->op_num].data.send_initial_metadata.count =
+            st->send_metadata.count;
+        st->ops[st->op_num].data.send_initial_metadata.metadata =
+            st->send_metadata.metadata;
+        break;
+      case GRPC_OP_SEND_MESSAGE:
+        st->ops[st->op_num].data.send_message =
+            grpc_rb_s_to_byte_buffer(RSTRING_PTR(this_value),
+                                     RSTRING_LEN(this_value));
+        break;
+      case GRPC_OP_SEND_CLOSE_FROM_CLIENT:
+        break;
+      case GRPC_OP_SEND_STATUS_FROM_SERVER:
+        /* N.B. later there is no need to explicitly delete the metadata keys
+         * and values, they are references to data in ruby objects. */
+        grpc_rb_op_update_status_from_server(&st->ops[st->op_num],
+                                             &st->send_trailing_metadata,
+                                             this_value);
+        break;
+      case GRPC_OP_RECV_INITIAL_METADATA:
+        st->ops[st->op_num].data.recv_initial_metadata = &st->recv_metadata;
+        break;
+      case GRPC_OP_RECV_MESSAGE:
+        st->ops[st->op_num].data.recv_message = &st->recv_message;
+        break;
+      case GRPC_OP_RECV_STATUS_ON_CLIENT:
+        st->ops[st->op_num].data.recv_status_on_client.trailing_metadata =
+            &st->recv_trailing_metadata;
+        st->ops[st->op_num].data.recv_status_on_client.status =
+            &st->recv_status;
+        st->ops[st->op_num].data.recv_status_on_client.status_details =
+            &st->recv_status_details;
+        st->ops[st->op_num].data.recv_status_on_client.status_details_capacity =
+            &st->recv_status_details_capacity;
+        break;
+      case GRPC_OP_RECV_CLOSE_ON_SERVER:
+        st->ops[st->op_num].data.recv_close_on_server.cancelled =
+            &st->recv_cancelled;
+        break;
+      default:
+        grpc_run_batch_stack_cleanup(st);
+        rb_raise(rb_eTypeError, "invalid operation : bad value %d",
+                 NUM2INT(this_op));
+    };
+    st->ops[st->op_num].op = (grpc_op_type)NUM2INT(this_op);
+    st->op_num++;
   }
-  Data_Get_Struct(self, grpc_call, call);
-  err = grpc_call_server_end_initial_metadata_old(call, NUM2UINT(flags));
-  if (err != GRPC_CALL_OK) {
-    rb_raise(rb_eCallError, "end_initial_metadata failed: %s (code=%d)",
-             grpc_call_error_detail_of(err), err);
+}
+
+/* grpc_run_batch_stack_build_result fills constructs a ruby BatchResult struct
+   after the results have run */
+static VALUE grpc_run_batch_stack_build_result(run_batch_stack* st) {
+  size_t i = 0;
+  VALUE result = rb_struct_new(rb_sBatchResult, Qnil, Qnil, Qnil, Qnil, Qnil,
+                               Qnil, Qnil, Qnil, NULL);
+  for (i = 0; i < st->op_num; i++) {
+    switch(st->ops[i].op) {
+      case GRPC_OP_SEND_INITIAL_METADATA:
+        rb_struct_aset(result, sym_send_metadata, Qtrue);
+        break;
+      case GRPC_OP_SEND_MESSAGE:
+        rb_struct_aset(result, sym_send_message, Qtrue);
+        grpc_byte_buffer_destroy(st->ops[i].data.send_message);
+        break;
+      case GRPC_OP_SEND_CLOSE_FROM_CLIENT:
+        rb_struct_aset(result, sym_send_close, Qtrue);
+        break;
+      case GRPC_OP_SEND_STATUS_FROM_SERVER:
+        rb_struct_aset(result, sym_send_status, Qtrue);
+        break;
+      case GRPC_OP_RECV_INITIAL_METADATA:
+        rb_struct_aset(result, sym_metadata,
+                       grpc_rb_md_ary_to_h(&st->recv_metadata));
+      case GRPC_OP_RECV_MESSAGE:
+        rb_struct_aset(result, sym_message,
+                       grpc_rb_byte_buffer_to_s(st->recv_message));
+        break;
+      case GRPC_OP_RECV_STATUS_ON_CLIENT:
+        rb_struct_aset(
+            result,
+            sym_status,
+            rb_struct_new(rb_sStatus,
+                          UINT2NUM(st->recv_status),
+                          (st->recv_status_details == NULL
+                           ? Qnil
+                           : rb_str_new2(st->recv_status_details)),
+                          grpc_rb_md_ary_to_h(&st->recv_trailing_metadata),
+                          NULL));
+        break;
+      case GRPC_OP_RECV_CLOSE_ON_SERVER:
+        rb_struct_aset(result, sym_send_close, Qtrue);
+        break;
+      default:
+        break;
+    }
   }
-  return Qnil;
+  return result;
 }
 
 /* call-seq:
-     call.server_accept(completion_queue, finished_tag)
-
-   Accept an incoming RPC, binding a completion queue to it.
-   To be called before sending or receiving messages.
-
-   REQUIRES: Can be called at most once per call.
-             Can only be called on the server.
-   Produces a GRPC_FINISHED event with finished_tag when the call has been
-       completed (there may be other events for the call pending at this
-       time) */
-static VALUE grpc_rb_call_server_accept(VALUE self, VALUE cqueue,
-                                        VALUE finished_tag) {
+   cq = CompletionQueue.new
+   ops = {
+     GRPC::Core::CallOps::SEND_INITIAL_METADATA => <op_value>,
+     GRPC::Core::CallOps::SEND_MESSAGE => <op_value>,
+     ...
+   }
+   tag = Object.new
+   timeout = 10
+   call.start_batch(cqueue, tag, timeout, ops)
+
+   Start a batch of operations defined in the array ops; when complete, post a
+   completion of type 'tag' to the completion queue bound to the call.
+
+   Also waits for the batch to complete, until timeout is reached.
+   The order of ops specified in the batch has no significance.
+   Only one operation of each type can be active at once in any given
+   batch */
+static VALUE grpc_rb_call_run_batch(VALUE self, VALUE cqueue, VALUE tag,
+                                    VALUE timeout, VALUE ops_hash) {
+  run_batch_stack st;
   grpc_call *call = NULL;
-  grpc_completion_queue *cq = grpc_rb_get_wrapped_completion_queue(cqueue);
+  grpc_event *ev = NULL;
   grpc_call_error err;
+  VALUE result = Qnil;
   Data_Get_Struct(self, grpc_call, call);
-  err = grpc_call_server_accept_old(call, cq, ROBJECT(finished_tag));
+
+  /* Validate the ops args, adding them to a ruby array */
+  if (TYPE(ops_hash) != T_HASH) {
+    rb_raise(rb_eTypeError, "call#run_batch: ops hash should be a hash");
+    return Qnil;
+  }
+  grpc_run_batch_stack_init(&st);
+  grpc_run_batch_stack_fill_ops(&st, ops_hash);
+
+  /* call grpc_call_start_batch, then wait for it to complete using
+   * pluck_event */
+  err = grpc_call_start_batch(call, st.ops, st.op_num, ROBJECT(tag));
   if (err != GRPC_CALL_OK) {
-    rb_raise(rb_eCallError, "server_accept failed: %s (code=%d)",
+    grpc_run_batch_stack_cleanup(&st);
+    rb_raise(rb_eCallError, "grpc_call_start_batch failed with %s (code=%d)",
              grpc_call_error_detail_of(err), err);
+    return;
+  }
+  ev = grpc_rb_completion_queue_pluck_event(cqueue, tag, timeout);
+  if (ev == NULL) {
+    grpc_run_batch_stack_cleanup(&st);
+    rb_raise(rb_eOutOfTime, "grpc_call_start_batch timed out");
+    return;
+  }
+  if (ev->data.op_complete != GRPC_OP_OK) {
+    grpc_run_batch_stack_cleanup(&st);
+    rb_raise(rb_eCallError, "start_batch completion failed, (code=%d)",
+             ev->data.op_complete);
+    return;
   }
 
-  /* Add the completion queue as an instance attribute, prevents it from being
-   * GCed until this call object is GCed */
-  rb_ivar_set(self, id_cq, cqueue);
-  return Qnil;
+  /* Build and return the BatchResult struct result */
+  result = grpc_run_batch_stack_build_result(&st);
+  grpc_run_batch_stack_cleanup(&st);
+  return result;
 }
 
 /* rb_cCall is the ruby class that proxies grpc_call. */
@@ -449,6 +586,10 @@ VALUE rb_cCall = Qnil;
    operations; */
 VALUE rb_eCallError = Qnil;
 
+/* rb_eOutOfTime is the ruby class of the exception thrown to indicate
+   a timeout. */
+VALUE rb_eOutOfTime = Qnil;
+
 void Init_grpc_error_codes() {
   /* Constants representing the error codes of grpc_call_error in grpc.h */
   VALUE rb_RpcErrors = rb_define_module_under(rb_mGrpcCore, "RpcErrors");
@@ -500,11 +641,35 @@ void Init_grpc_error_codes() {
   rb_obj_freeze(rb_error_code_details);
 }
 
+void Init_grpc_op_codes() {
+  /* Constants representing operation type codes in grpc.h */
+  VALUE rb_CallOps = rb_define_module_under(rb_mGrpcCore, "CallOps");
+  rb_define_const(rb_CallOps, "SEND_INITIAL_METADATA",
+                  UINT2NUM(GRPC_OP_SEND_INITIAL_METADATA));
+  rb_define_const(rb_CallOps, "SEND_MESSAGE", UINT2NUM(GRPC_OP_SEND_MESSAGE));
+  rb_define_const(rb_CallOps, "SEND_CLOSE_FROM_CLIENT",
+                  UINT2NUM(GRPC_OP_SEND_CLOSE_FROM_CLIENT));
+  rb_define_const(rb_CallOps, "SEND_STATUS_FROM_SERVER",
+                  UINT2NUM(GRPC_OP_SEND_STATUS_FROM_SERVER));
+  rb_define_const(rb_CallOps, "RECV_INITIAL_METADATA",
+                  UINT2NUM(GRPC_OP_RECV_INITIAL_METADATA));
+  rb_define_const(rb_CallOps, "RECV_MESSAGE",
+                  UINT2NUM(GRPC_OP_RECV_MESSAGE));
+  rb_define_const(rb_CallOps, "RECV_STATUS_ON_CLIENT",
+                  UINT2NUM(GRPC_OP_RECV_STATUS_ON_CLIENT));
+  rb_define_const(rb_CallOps, "RECV_CLOSE_ON_SERVER",
+                  UINT2NUM(GRPC_OP_RECV_CLOSE_ON_SERVER));
+}
+
 void Init_grpc_call() {
   /* CallError inherits from Exception to signal that it is non-recoverable */
   rb_eCallError =
       rb_define_class_under(rb_mGrpcCore, "CallError", rb_eException);
+  rb_eOutOfTime =
+      rb_define_class_under(rb_mGrpcCore, "OutOfTime", rb_eException);
   rb_cCall = rb_define_class_under(rb_mGrpcCore, "Call", rb_cObject);
+  rb_cMdAry = rb_define_class_under(rb_mGrpcCore, "MetadataArray",
+                                    rb_cObject);
 
   /* Prevent allocation or inialization of the Call class */
   rb_define_alloc_func(rb_cCall, grpc_rb_cannot_alloc);
@@ -512,17 +677,8 @@ void Init_grpc_call() {
   rb_define_method(rb_cCall, "initialize_copy", grpc_rb_cannot_init_copy, 1);
 
   /* Add ruby analogues of the Call methods. */
-  rb_define_method(rb_cCall, "server_accept", grpc_rb_call_server_accept, 2);
-  rb_define_method(rb_cCall, "server_end_initial_metadata",
-                   grpc_rb_call_server_end_initial_metadata, -1);
-  rb_define_method(rb_cCall, "add_metadata", grpc_rb_call_add_metadata, -1);
+  rb_define_method(rb_cCall, "run_batch", grpc_rb_call_run_batch, 4);
   rb_define_method(rb_cCall, "cancel", grpc_rb_call_cancel, 0);
-  rb_define_method(rb_cCall, "invoke", grpc_rb_call_invoke, -1);
-  rb_define_method(rb_cCall, "start_read", grpc_rb_call_start_read, 1);
-  rb_define_method(rb_cCall, "start_write", grpc_rb_call_start_write, -1);
-  rb_define_method(rb_cCall, "start_write_status",
-                   grpc_rb_call_start_write_status, 3);
-  rb_define_method(rb_cCall, "writes_done", grpc_rb_call_writes_done, 1);
   rb_define_method(rb_cCall, "status", grpc_rb_call_get_status, 0);
   rb_define_method(rb_cCall, "status=", grpc_rb_call_set_status, 1);
   rb_define_method(rb_cCall, "metadata", grpc_rb_call_get_metadata, 0);
@@ -537,12 +693,35 @@ void Init_grpc_call() {
   id_flags = rb_intern("__flags");
   id_input_md = rb_intern("__input_md");
 
+  /* Ids used in constructing the batch result. */
+  sym_send_message = ID2SYM(rb_intern("send_message"));
+  sym_send_metadata = ID2SYM(rb_intern("send_metadata"));
+  sym_send_close = ID2SYM(rb_intern("send_close"));
+  sym_send_status = ID2SYM(rb_intern("send_status"));
+  sym_message = ID2SYM(rb_intern("message"));
+  sym_status = ID2SYM(rb_intern("status"));
+  sym_cancelled = ID2SYM(rb_intern("cancelled"));
+
+  /* The Struct used to return the run_batch result. */
+  rb_sBatchResult = rb_struct_define(
+      "BatchResult",
+      "send_message",
+      "send_metadata",
+      "send_close",
+      "send_status",
+      "message",
+      "metadata",
+      "status",
+      "cancelled",
+      NULL);
+
   /* The hash for reference counting calls, to ensure they can't be destroyed
    * more than once */
   hash_all_calls = rb_hash_new();
   rb_define_const(rb_cCall, "INTERNAL_ALL_CALLs", hash_all_calls);
 
   Init_grpc_error_codes();
+  Init_grpc_op_codes();
 }
 
 /* Gets the call from the ruby object */
diff --git a/src/ruby/ext/grpc/rb_call.h b/src/ruby/ext/grpc/rb_call.h
index bb51759a467bdd51b98051fee82e5910e5f48f06..03e570863c27aab33bf9e5f6183189742062e8bf 100644
--- a/src/ruby/ext/grpc/rb_call.h
+++ b/src/ruby/ext/grpc/rb_call.h
@@ -46,13 +46,20 @@ VALUE grpc_rb_wrap_call(grpc_call* c);
 /* Provides the details of an call error */
 const char* grpc_call_error_detail_of(grpc_call_error err);
 
+/* Converts a metadata array to a hash. */
+VALUE grpc_rb_md_ary_to_h(grpc_metadata_array *md_ary);
+
 /* rb_cCall is the Call class whose instances proxy grpc_call. */
 extern VALUE rb_cCall;
 
-/* rb_cCallError is the ruby class of the exception thrown during call
+/* rb_eCallError is the ruby class of the exception thrown during call
    operations. */
 extern VALUE rb_eCallError;
 
+/* rb_eOutOfTime is the ruby class of the exception thrown to indicate
+   a timeout. */
+extern VALUE rb_eOutOfTime;
+
 /* Initializes the Call class. */
 void Init_grpc_call();
 
diff --git a/src/ruby/ext/grpc/rb_channel.c b/src/ruby/ext/grpc/rb_channel.c
index 2a48f46ce2eeaeec1d53aa532f7cd375f4ba8606..76a65fe6fe094f436a37be80253a8ff53fc147be 100644
--- a/src/ruby/ext/grpc/rb_channel.c
+++ b/src/ruby/ext/grpc/rb_channel.c
@@ -49,10 +49,16 @@
 static ID id_channel;
 
 /* id_target is the name of the hidden ivar that preserves a reference to the
- * target string used to create the call, preserved so that is does not get
+ * target string used to create the call, preserved so that it does not get
  * GCed before the channel */
 static ID id_target;
 
+/* id_cqueue is the name of the hidden ivar that preserves a reference to the
+ * completion queue used to create the call, preserved so that it does not get
+ * GCed before the channel */
+static ID id_cqueue;
+
+
 /* Used during the conversion of a hash to channel args during channel setup */
 static VALUE rb_cChannelArgs;
 
@@ -142,6 +148,7 @@ static VALUE grpc_rb_channel_init(int argc, VALUE *argv, VALUE self) {
   if (ch == NULL) {
     rb_raise(rb_eRuntimeError, "could not create an rpc channel to target:%s",
              target_chars);
+    return Qnil;
   }
   rb_ivar_set(self, id_target, target);
   wrapper->wrapped = ch;
@@ -164,6 +171,7 @@ static VALUE grpc_rb_channel_init_copy(VALUE copy, VALUE orig) {
   if (TYPE(orig) != T_DATA ||
       RDATA(orig)->dfree != (RUBY_DATA_FUNC)grpc_rb_channel_free) {
     rb_raise(rb_eTypeError, "not a %s", rb_obj_classname(rb_cChannel));
+    return Qnil;
   }
 
   Data_Get_Struct(orig, grpc_rb_channel, orig_ch);
@@ -177,34 +185,42 @@ static VALUE grpc_rb_channel_init_copy(VALUE copy, VALUE orig) {
 
 /* Create a call given a grpc_channel, in order to call method. The request
    is not sent until grpc_call_invoke is called. */
-static VALUE grpc_rb_channel_create_call(VALUE self, VALUE method, VALUE host,
-                                         VALUE deadline) {
+static VALUE grpc_rb_channel_create_call(VALUE self, VALUE cqueue, VALUE method,
+                                         VALUE host, VALUE deadline) {
   VALUE res = Qnil;
   grpc_rb_channel *wrapper = NULL;
-  grpc_channel *ch = NULL;
   grpc_call *call = NULL;
+  grpc_channel *ch = NULL;
+  grpc_completion_queue *cq = NULL;
   char *method_chars = StringValueCStr(method);
   char *host_chars = StringValueCStr(host);
 
+  cq = grpc_rb_get_wrapped_completion_queue(cqueue);
   Data_Get_Struct(self, grpc_rb_channel, wrapper);
   ch = wrapper->wrapped;
   if (ch == NULL) {
     rb_raise(rb_eRuntimeError, "closed!");
+    return Qnil;
   }
 
   call =
-      grpc_channel_create_call_old(ch, method_chars, host_chars,
-                                   grpc_rb_time_timeval(deadline,
-                                                        /* absolute time */ 0));
+      grpc_channel_create_call(ch, cq, method_chars, host_chars,
+                               grpc_rb_time_timeval(deadline,
+                                                    /* absolute time */ 0));
   if (call == NULL) {
     rb_raise(rb_eRuntimeError, "cannot create call with method %s",
              method_chars);
+    return Qnil;
   }
   res = grpc_rb_wrap_call(call);
 
-  /* Make this channel an instance attribute of the call so that is is not GCed
+  /* Make this channel an instance attribute of the call so that it is not GCed
    * before the call. */
   rb_ivar_set(res, id_channel, self);
+
+  /* Make the completion queue an instance attribute of the call so that it is
+   * not GCed before the call. */
+  rb_ivar_set(res, id_cqueue, cqueue);
   return res;
 }
 
@@ -240,11 +256,12 @@ void Init_grpc_channel() {
                    1);
 
   /* Add ruby analogues of the Channel methods. */
-  rb_define_method(rb_cChannel, "create_call", grpc_rb_channel_create_call, 3);
+  rb_define_method(rb_cChannel, "create_call", grpc_rb_channel_create_call, 4);
   rb_define_method(rb_cChannel, "destroy", grpc_rb_channel_destroy, 0);
   rb_define_alias(rb_cChannel, "close", "destroy");
 
   id_channel = rb_intern("__channel");
+  id_cqueue = rb_intern("__cqueue");
   id_target = rb_intern("__target");
   rb_define_const(rb_cChannel, "SSL_TARGET",
                   ID2SYM(rb_intern(GRPC_SSL_TARGET_NAME_OVERRIDE_ARG)));
diff --git a/src/ruby/ext/grpc/rb_completion_queue.c b/src/ruby/ext/grpc/rb_completion_queue.c
index 3fdbdd837a7e7866d3a245053695e52f6e484964..688db94851ba08b08d4ca2efff1e28183a584017 100644
--- a/src/ruby/ext/grpc/rb_completion_queue.c
+++ b/src/ruby/ext/grpc/rb_completion_queue.c
@@ -38,7 +38,6 @@
 #include <grpc/grpc.h>
 #include <grpc/support/time.h>
 #include "rb_grpc.h"
-#include "rb_event.h"
 
 /* Used to allow grpc_completion_queue_next call to release the GIL */
 typedef struct next_call_stack {
@@ -140,8 +139,19 @@ static VALUE grpc_rb_completion_queue_next(VALUE self, VALUE timeout) {
 
 /* Blocks until the next event for given tag is available, and returns the
  * event. */
-static VALUE grpc_rb_completion_queue_pluck(VALUE self, VALUE tag,
-                                            VALUE timeout) {
+VALUE grpc_rb_completion_queue_pluck(VALUE self, VALUE tag,
+                                     VALUE timeout) {
+  grpc_event *ev = grpc_rb_completion_queue_pluck_event(self, tag, timeout);
+  if (ev == NULL) {
+    return Qnil;
+  }
+  return grpc_rb_new_event(ev);
+}
+
+/* Blocks until the next event for given tag is available, and returns the
+ * event. */
+grpc_event* grpc_rb_completion_queue_pluck_event(VALUE self, VALUE tag,
+                                                 VALUE timeout) {
   next_call_stack next_call;
   MEMZERO(&next_call, next_call_stack, 1);
   Data_Get_Struct(self, grpc_completion_queue, next_call.cq);
@@ -151,9 +161,9 @@ static VALUE grpc_rb_completion_queue_pluck(VALUE self, VALUE tag,
   rb_thread_call_without_gvl(grpc_rb_completion_queue_pluck_no_gil,
                              (void *)&next_call, NULL, NULL);
   if (next_call.event == NULL) {
-    return Qnil;
+    return NULL;
   }
-  return grpc_rb_new_event(next_call.event);
+  return next_call.event;
 }
 
 /* rb_cCompletionQueue is the ruby class that proxies grpc_completion_queue. */
diff --git a/src/ruby/ext/grpc/rb_completion_queue.h b/src/ruby/ext/grpc/rb_completion_queue.h
index 38025ea2d2e2488d81b7b879a89a1fa8f05e4c55..13715ccaa754a95b8c0be03f66aa4ce13a3e5fbd 100644
--- a/src/ruby/ext/grpc/rb_completion_queue.h
+++ b/src/ruby/ext/grpc/rb_completion_queue.h
@@ -40,6 +40,14 @@
 /* Gets the wrapped completion queue from the ruby wrapper */
 grpc_completion_queue *grpc_rb_get_wrapped_completion_queue(VALUE v);
 
+/**
+ * Makes the implementation of CompletionQueue#pluck available in other files
+ *
+ * This avoids having code that holds the GIL repeated at multiple sites.
+ */
+grpc_event* grpc_rb_completion_queue_pluck_event(VALUE cqueue, VALUE tag,
+                                                 VALUE timeout);
+
 /* rb_cCompletionQueue is the CompletionQueue class whose instances proxy
    grpc_completion_queue. */
 extern VALUE rb_cCompletionQueue;
diff --git a/src/ruby/ext/grpc/rb_event.c b/src/ruby/ext/grpc/rb_event.c
deleted file mode 100644
index 2e64af4c847cac31b4b9daea0128de4394375abd..0000000000000000000000000000000000000000
--- a/src/ruby/ext/grpc/rb_event.c
+++ /dev/null
@@ -1,361 +0,0 @@
-/*
- *
- * Copyright 2015, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
-
-#include "rb_event.h"
-
-#include <ruby.h>
-
-#include <grpc/grpc.h>
-#include "rb_grpc.h"
-#include "rb_byte_buffer.h"
-#include "rb_call.h"
-#include "rb_metadata.h"
-
-/* grpc_rb_event wraps a grpc_event.  It provides a peer ruby object,
- * 'mark' to minimize copying when an event is created from ruby. */
-typedef struct grpc_rb_event {
-  /* Holder of ruby objects involved in constructing the channel */
-  VALUE mark;
-  /* The actual event */
-  grpc_event *wrapped;
-} grpc_rb_event;
-
-/* rb_mCompletionType is a ruby module that holds the completion type values */
-VALUE rb_mCompletionType = Qnil;
-
-/* Destroys Event instances. */
-static void grpc_rb_event_free(void *p) {
-  grpc_rb_event *ev = NULL;
-  if (p == NULL) {
-    return;
-  };
-  ev = (grpc_rb_event *)p;
-
-  /* Deletes the wrapped object if the mark object is Qnil, which indicates
-   * that no other object is the actual owner. */
-  if (ev->wrapped != NULL && ev->mark == Qnil) {
-    grpc_event_finish(ev->wrapped);
-    rb_warning("event gc: destroyed the c event");
-  } else {
-    rb_warning("event gc: did not destroy the c event");
-  }
-
-  xfree(p);
-}
-
-/* Protects the mark object from GC */
-static void grpc_rb_event_mark(void *p) {
-  grpc_rb_event *event = NULL;
-  if (p == NULL) {
-    return;
-  }
-  event = (grpc_rb_event *)p;
-  if (event->mark != Qnil) {
-    rb_gc_mark(event->mark);
-  }
-}
-
-static VALUE grpc_rb_event_result(VALUE self);
-
-/* Obtains the type of an event. */
-static VALUE grpc_rb_event_type(VALUE self) {
-  grpc_event *event = NULL;
-  grpc_rb_event *wrapper = NULL;
-  Data_Get_Struct(self, grpc_rb_event, wrapper);
-  if (wrapper->wrapped == NULL) {
-    rb_raise(rb_eRuntimeError, "finished!");
-    return Qnil;
-  }
-
-  event = wrapper->wrapped;
-  switch (event->type) {
-    case GRPC_QUEUE_SHUTDOWN:
-      return rb_const_get(rb_mCompletionType, rb_intern("QUEUE_SHUTDOWN"));
-
-    case GRPC_READ:
-      return rb_const_get(rb_mCompletionType, rb_intern("READ"));
-
-    case GRPC_WRITE_ACCEPTED:
-      grpc_rb_event_result(self); /* validates the result */
-      return rb_const_get(rb_mCompletionType, rb_intern("WRITE_ACCEPTED"));
-
-    case GRPC_FINISH_ACCEPTED:
-      grpc_rb_event_result(self); /* validates the result */
-      return rb_const_get(rb_mCompletionType, rb_intern("FINISH_ACCEPTED"));
-
-    case GRPC_CLIENT_METADATA_READ:
-      return rb_const_get(rb_mCompletionType,
-                          rb_intern("CLIENT_METADATA_READ"));
-
-    case GRPC_FINISHED:
-      return rb_const_get(rb_mCompletionType, rb_intern("FINISHED"));
-
-    case GRPC_SERVER_RPC_NEW:
-      return rb_const_get(rb_mCompletionType, rb_intern("SERVER_RPC_NEW"));
-
-    default:
-      rb_raise(rb_eRuntimeError, "unrecognized event code for an rpc event:%d",
-               event->type);
-  }
-  return Qnil; /* should not be reached */
-}
-
-/* Obtains the tag associated with an event. */
-static VALUE grpc_rb_event_tag(VALUE self) {
-  grpc_event *event = NULL;
-  grpc_rb_event *wrapper = NULL;
-  Data_Get_Struct(self, grpc_rb_event, wrapper);
-  if (wrapper->wrapped == NULL) {
-    rb_raise(rb_eRuntimeError, "finished!");
-    return Qnil;
-  }
-
-  event = wrapper->wrapped;
-  if (event->tag == NULL) {
-    return Qnil;
-  }
-  return (VALUE)event->tag;
-}
-
-/* Obtains the call associated with an event. */
-static VALUE grpc_rb_event_call(VALUE self) {
-  grpc_event *event = NULL;
-  grpc_rb_event *wrapper = NULL;
-  Data_Get_Struct(self, grpc_rb_event, wrapper);
-  if (wrapper->wrapped == NULL) {
-    rb_raise(rb_eRuntimeError, "finished!");
-    return Qnil;
-  }
-
-  event = wrapper->wrapped;
-  if (event->call != NULL) {
-    return grpc_rb_wrap_call(event->call);
-  }
-  return Qnil;
-}
-
-/* Obtains the metadata associated with an event. */
-static VALUE grpc_rb_event_metadata(VALUE self) {
-  grpc_event *event = NULL;
-  grpc_rb_event *wrapper = NULL;
-  grpc_metadata *metadata = NULL;
-  VALUE key = Qnil;
-  VALUE new_ary = Qnil;
-  VALUE result = Qnil;
-  VALUE value = Qnil;
-  size_t count = 0;
-  size_t i = 0;
-  Data_Get_Struct(self, grpc_rb_event, wrapper);
-  if (wrapper->wrapped == NULL) {
-    rb_raise(rb_eRuntimeError, "finished!");
-    return Qnil;
-  }
-
-  /* Figure out which metadata to read. */
-  event = wrapper->wrapped;
-  switch (event->type) {
-    case GRPC_CLIENT_METADATA_READ:
-      count = event->data.client_metadata_read.count;
-      metadata = event->data.client_metadata_read.elements;
-      break;
-
-    case GRPC_FINISHED:
-      count = event->data.finished.metadata_count;
-      metadata = event->data.finished.metadata_elements;
-      break;
-
-    case GRPC_SERVER_RPC_NEW:
-      count = event->data.server_rpc_new.metadata_count;
-      metadata = event->data.server_rpc_new.metadata_elements;
-      break;
-
-    default:
-      rb_raise(rb_eRuntimeError,
-               "bug: bad event type metadata. got %d; want %d|%d:%d",
-               event->type, GRPC_CLIENT_METADATA_READ, GRPC_FINISHED,
-               GRPC_SERVER_RPC_NEW);
-      return Qnil;
-  }
-
-  result = rb_hash_new();
-  for (i = 0; i < count; i++) {
-    key = rb_str_new2(metadata[i].key);
-    value = rb_hash_aref(result, key);
-    if (value == Qnil) {
-      value = rb_str_new(metadata[i].value, metadata[i].value_length);
-      rb_hash_aset(result, key, value);
-    } else if (TYPE(value) == T_ARRAY) {
-      /* Add the string to the returned array */
-      rb_ary_push(value,
-                  rb_str_new(metadata[i].value, metadata[i].value_length));
-    } else {
-      /* Add the current value with this key and the new one to an array */
-      new_ary = rb_ary_new();
-      rb_ary_push(new_ary, value);
-      rb_ary_push(new_ary,
-                  rb_str_new(metadata[i].value, metadata[i].value_length));
-      rb_hash_aset(result, key, new_ary);
-    }
-  }
-  return result;
-}
-
-/* Obtains the data associated with an event. */
-static VALUE grpc_rb_event_result(VALUE self) {
-  grpc_event *event = NULL;
-  grpc_rb_event *wrapper = NULL;
-  Data_Get_Struct(self, grpc_rb_event, wrapper);
-  if (wrapper->wrapped == NULL) {
-    rb_raise(rb_eRuntimeError, "finished!");
-    return Qnil;
-  }
-  event = wrapper->wrapped;
-
-  switch (event->type) {
-    case GRPC_QUEUE_SHUTDOWN:
-      return Qnil;
-
-    case GRPC_READ:
-      return grpc_rb_byte_buffer_create_with_mark(self, event->data.read);
-
-    case GRPC_FINISH_ACCEPTED:
-      if (event->data.finish_accepted == GRPC_OP_OK) {
-        return Qnil;
-      }
-      rb_raise(rb_eEventError, "finish failed, not sure why (code=%d)",
-               event->data.finish_accepted);
-      break;
-
-    case GRPC_WRITE_ACCEPTED:
-      if (event->data.write_accepted == GRPC_OP_OK) {
-        return Qnil;
-      }
-      rb_raise(rb_eEventError, "write failed, not sure why (code=%d)",
-               event->data.write_accepted);
-      break;
-
-    case GRPC_CLIENT_METADATA_READ:
-      return grpc_rb_event_metadata(self);
-
-    case GRPC_FINISHED:
-      return rb_struct_new(rb_sStatus, UINT2NUM(event->data.finished.status),
-                           (event->data.finished.details == NULL
-                                ? Qnil
-                                : rb_str_new2(event->data.finished.details)),
-                           grpc_rb_event_metadata(self), NULL);
-      break;
-
-    case GRPC_SERVER_RPC_NEW:
-      return rb_struct_new(
-          rb_sNewServerRpc, rb_str_new2(event->data.server_rpc_new.method),
-          rb_str_new2(event->data.server_rpc_new.host),
-          Data_Wrap_Struct(rb_cTimeVal, GC_NOT_MARKED, GC_DONT_FREE,
-                           (void *)&event->data.server_rpc_new.deadline),
-          grpc_rb_event_metadata(self), NULL);
-
-    default:
-      rb_raise(rb_eRuntimeError, "unrecognized event code for an rpc event:%d",
-               event->type);
-  }
-
-  return Qfalse;
-}
-
-static VALUE grpc_rb_event_finish(VALUE self) {
-  grpc_event *event = NULL;
-  grpc_rb_event *wrapper = NULL;
-  Data_Get_Struct(self, grpc_rb_event, wrapper);
-  if (wrapper->wrapped == NULL) { /* already closed  */
-    return Qnil;
-  }
-  event = wrapper->wrapped;
-  grpc_event_finish(event);
-  wrapper->wrapped = NULL;
-  wrapper->mark = Qnil;
-  return Qnil;
-}
-
-/* rb_cEvent is the Event class whose instances proxy grpc_event */
-VALUE rb_cEvent = Qnil;
-
-/* rb_eEventError is the ruby class of the exception thrown on failures during
-   rpc event processing. */
-VALUE rb_eEventError = Qnil;
-
-void Init_grpc_event() {
-  rb_eEventError =
-      rb_define_class_under(rb_mGrpcCore, "EventError", rb_eStandardError);
-  rb_cEvent = rb_define_class_under(rb_mGrpcCore, "Event", rb_cObject);
-
-  /* Prevent allocation or inialization from ruby. */
-  rb_define_alloc_func(rb_cEvent, grpc_rb_cannot_alloc);
-  rb_define_method(rb_cEvent, "initialize", grpc_rb_cannot_init, 0);
-  rb_define_method(rb_cEvent, "initialize_copy", grpc_rb_cannot_init_copy, 1);
-
-  /* Accessors for the data available in an event. */
-  rb_define_method(rb_cEvent, "call", grpc_rb_event_call, 0);
-  rb_define_method(rb_cEvent, "result", grpc_rb_event_result, 0);
-  rb_define_method(rb_cEvent, "tag", grpc_rb_event_tag, 0);
-  rb_define_method(rb_cEvent, "type", grpc_rb_event_type, 0);
-  rb_define_method(rb_cEvent, "finish", grpc_rb_event_finish, 0);
-  rb_define_alias(rb_cEvent, "close", "finish");
-
-  /* Constants representing the completion types */
-  rb_mCompletionType =
-      rb_define_module_under(rb_mGrpcCore, "CompletionType");
-  rb_define_const(rb_mCompletionType, "QUEUE_SHUTDOWN",
-                  INT2NUM(GRPC_QUEUE_SHUTDOWN));
-  rb_define_const(rb_mCompletionType, "OP_COMPLETE", INT2NUM(GRPC_OP_COMPLETE));
-  rb_define_const(rb_mCompletionType, "READ", INT2NUM(GRPC_READ));
-  rb_define_const(rb_mCompletionType, "WRITE_ACCEPTED",
-                  INT2NUM(GRPC_WRITE_ACCEPTED));
-  rb_define_const(rb_mCompletionType, "FINISH_ACCEPTED",
-                  INT2NUM(GRPC_FINISH_ACCEPTED));
-  rb_define_const(rb_mCompletionType, "CLIENT_METADATA_READ",
-                  INT2NUM(GRPC_CLIENT_METADATA_READ));
-  rb_define_const(rb_mCompletionType, "FINISHED", INT2NUM(GRPC_FINISHED));
-  rb_define_const(rb_mCompletionType, "SERVER_RPC_NEW",
-                  INT2NUM(GRPC_SERVER_RPC_NEW));
-  rb_define_const(rb_mCompletionType, "SERVER_SHUTDOWN",
-                  INT2NUM(GRPC_SERVER_SHUTDOWN));
-  rb_define_const(rb_mCompletionType, "RESERVED",
-                  INT2NUM(GRPC_COMPLETION_DO_NOT_USE));
-}
-
-VALUE grpc_rb_new_event(grpc_event *ev) {
-  grpc_rb_event *wrapper = ALLOC(grpc_rb_event);
-  wrapper->wrapped = ev;
-  wrapper->mark = Qnil;
-  return Data_Wrap_Struct(rb_cEvent, grpc_rb_event_mark, grpc_rb_event_free,
-                          wrapper);
-}
diff --git a/src/ruby/ext/grpc/rb_grpc.c b/src/ruby/ext/grpc/rb_grpc.c
index 400efd0dfad8d3909e7fe4049a3e6ebef235f351..d4335dd1bad43762a22bc5f60de79b6801e27a94 100644
--- a/src/ruby/ext/grpc/rb_grpc.c
+++ b/src/ruby/ext/grpc/rb_grpc.c
@@ -39,12 +39,9 @@
 
 #include <grpc/grpc.h>
 #include <grpc/support/time.h>
-#include "rb_byte_buffer.h"
 #include "rb_call.h"
 #include "rb_channel.h"
 #include "rb_completion_queue.h"
-#include "rb_event.h"
-#include "rb_metadata.h"
 #include "rb_server.h"
 #include "rb_credentials.h"
 #include "rb_server_credentials.h"
@@ -195,7 +192,7 @@ static ID id_inspect;
 /* id_to_s is the to_s method found on various ruby objects. */
 static ID id_to_s;
 
-/* Converts `a wrapped time constant to a standard time. */
+/* Converts a wrapped time constant to a standard time. */
 VALUE grpc_rb_time_val_to_time(VALUE self) {
   gpr_timespec *time_const = NULL;
   Data_Get_Struct(self, gpr_timespec, time_const);
@@ -257,16 +254,16 @@ void Init_grpc() {
   rb_mGRPC = rb_define_module("GRPC");
   rb_mGrpcCore = rb_define_module_under(rb_mGRPC, "Core");
   rb_sNewServerRpc = rb_struct_define("NewServerRpc", "method", "host",
-                                      "deadline", "metadata", NULL);
+                                      "deadline", "metadata", "call", NULL);
   rb_sStatus = rb_struct_define("Status", "code", "details", "metadata", NULL);
+  sym_code = ID2SYM(rb_intern("code"));
+  sym_details = ID2SYM(rb_intern("details"));
+  sym_metadata = ID2SYM(rb_intern("metadata"));
 
-  Init_grpc_byte_buffer();
-  Init_grpc_event();
   Init_grpc_channel();
   Init_grpc_completion_queue();
   Init_grpc_call();
   Init_grpc_credentials();
-  Init_grpc_metadata();
   Init_grpc_server();
   Init_grpc_server_credentials();
   Init_grpc_status_codes();
diff --git a/src/ruby/ext/grpc/rb_grpc.h b/src/ruby/ext/grpc/rb_grpc.h
index 851f5ee69fa67c864e6c17fc9b5c79ccbe8de4a3..4ff9b7f6e90fcdedb1401787c727f746320cd94c 100644
--- a/src/ruby/ext/grpc/rb_grpc.h
+++ b/src/ruby/ext/grpc/rb_grpc.h
@@ -50,6 +50,15 @@ extern VALUE rb_sNewServerRpc;
 /* rb_sStruct is the struct that holds status details. */
 extern VALUE rb_sStatus;
 
+/* sym_code is the symbol for the code attribute of rb_sStatus. */
+VALUE sym_code;
+
+/* sym_details is the symbol for the details attribute of rb_sStatus. */
+VALUE sym_details;
+
+/* sym_metadata is the symbol for the metadata attribute of rb_sStatus. */
+VALUE sym_metadata;
+
 /* GC_NOT_MARKED is used in calls to Data_Wrap_Struct to indicate that the
    wrapped struct does not need to participate in ruby gc. */
 extern const RUBY_DATA_FUNC GC_NOT_MARKED;
diff --git a/src/ruby/ext/grpc/rb_metadata.c b/src/ruby/ext/grpc/rb_metadata.c
deleted file mode 100644
index 7622a8c57ed036f2fefd7d1d6255079cd56b0a3e..0000000000000000000000000000000000000000
--- a/src/ruby/ext/grpc/rb_metadata.c
+++ /dev/null
@@ -1,215 +0,0 @@
-/*
- *
- * Copyright 2015, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
-
-#include "rb_metadata.h"
-
-#include <ruby.h>
-#include <string.h>
-
-#include <grpc/grpc.h>
-#include "rb_grpc.h"
-
-/* grpc_rb_metadata wraps a grpc_metadata.  It provides a peer ruby object,
- * 'mark' to minimize copying when a metadata is created from ruby. */
-typedef struct grpc_rb_metadata {
-  /* Holder of ruby objects involved in constructing the metadata */
-  VALUE mark;
-  /* The actual metadata */
-  grpc_metadata *wrapped;
-} grpc_rb_metadata;
-
-/* Destroys Metadata instances. */
-static void grpc_rb_metadata_free(void *p) {
-  if (p == NULL) {
-    return;
-  };
-
-  /* Because metadata is only created during a call to grpc_call_add_metadata,
-   * and the call takes ownership of the metadata, this does not free the
-   * wrapped struct, only the wrapper */
-  xfree(p);
-}
-
-/* Protects the mark object from GC */
-static void grpc_rb_metadata_mark(void *p) {
-  grpc_rb_metadata *md = NULL;
-  if (p == NULL) {
-    return;
-  }
-
-  md = (grpc_rb_metadata *)p;
-  /* If it's not already cleaned up, mark the mark object */
-  if (md->mark != Qnil && BUILTIN_TYPE(md->mark) != T_NONE) {
-    rb_gc_mark(md->mark);
-  }
-}
-
-/* Allocates Metadata instances.
-
-   Provides safe default values for the Metadata fields. */
-static VALUE grpc_rb_metadata_alloc(VALUE cls) {
-  grpc_rb_metadata *wrapper = ALLOC(grpc_rb_metadata);
-  wrapper->wrapped = NULL;
-  wrapper->mark = Qnil;
-  return Data_Wrap_Struct(cls, grpc_rb_metadata_mark, grpc_rb_metadata_free,
-                          wrapper);
-}
-
-/* id_key and id_value are the names of the hidden ivars that preserve the
- * original byte_buffer source string */
-static ID id_key;
-static ID id_value;
-
-/* Initializes Metadata instances. */
-static VALUE grpc_rb_metadata_init(VALUE self, VALUE key, VALUE value) {
-  grpc_rb_metadata *wrapper = NULL;
-  grpc_metadata *md = ALLOC(grpc_metadata);
-
-  /* Use direct pointers to the strings wrapped by the ruby object to avoid
-   * copying */
-  Data_Get_Struct(self, grpc_rb_metadata, wrapper);
-  wrapper->wrapped = md;
-  if (TYPE(key) == T_SYMBOL) {
-    md->key = (char *)rb_id2name(SYM2ID(key));
-  } else { /* StringValueCStr does all other type exclusions for us */
-    md->key = StringValueCStr(key);
-  }
-  md->value = RSTRING_PTR(value);
-  md->value_length = RSTRING_LEN(value);
-
-  /* Save references to the original values on the mark object so that the
-   * pointers used there are valid for the lifetime of the object. */
-  wrapper->mark = rb_class_new_instance(0, NULL, rb_cObject);
-  rb_ivar_set(wrapper->mark, id_key, key);
-  rb_ivar_set(wrapper->mark, id_value, value);
-
-  return self;
-}
-
-/* Clones Metadata instances.
-
-   Gives Metadata a consistent implementation of Ruby's object copy/dup
-   protocol. */
-static VALUE grpc_rb_metadata_init_copy(VALUE copy, VALUE orig) {
-  grpc_rb_metadata *orig_md = NULL;
-  grpc_rb_metadata *copy_md = NULL;
-
-  if (copy == orig) {
-    return copy;
-  }
-
-  /* Raise an error if orig is not a metadata object or a subclass. */
-  if (TYPE(orig) != T_DATA ||
-      RDATA(orig)->dfree != (RUBY_DATA_FUNC)grpc_rb_metadata_free) {
-    rb_raise(rb_eTypeError, "not a %s", rb_obj_classname(rb_cMetadata));
-  }
-
-  Data_Get_Struct(orig, grpc_rb_metadata, orig_md);
-  Data_Get_Struct(copy, grpc_rb_metadata, copy_md);
-
-  /* use ruby's MEMCPY to make a byte-for-byte copy of the metadata wrapper
-   * object. */
-  MEMCPY(copy_md, orig_md, grpc_rb_metadata, 1);
-  return copy;
-}
-
-/* Gets the key from a metadata instance. */
-static VALUE grpc_rb_metadata_key(VALUE self) {
-  VALUE key = Qnil;
-  grpc_rb_metadata *wrapper = NULL;
-  grpc_metadata *md = NULL;
-
-  Data_Get_Struct(self, grpc_rb_metadata, wrapper);
-  if (wrapper->mark != Qnil) {
-    key = rb_ivar_get(wrapper->mark, id_key);
-    if (key != Qnil) {
-      return key;
-    }
-  }
-
-  md = wrapper->wrapped;
-  if (md == NULL || md->key == NULL) {
-    return Qnil;
-  }
-  return rb_str_new2(md->key);
-}
-
-/* Gets the value from a metadata instance. */
-static VALUE grpc_rb_metadata_value(VALUE self) {
-  VALUE val = Qnil;
-  grpc_rb_metadata *wrapper = NULL;
-  grpc_metadata *md = NULL;
-
-  Data_Get_Struct(self, grpc_rb_metadata, wrapper);
-  if (wrapper->mark != Qnil) {
-    val = rb_ivar_get(wrapper->mark, id_value);
-    if (val != Qnil) {
-      return val;
-    }
-  }
-
-  md = wrapper->wrapped;
-  if (md == NULL || md->value == NULL) {
-    return Qnil;
-  }
-  return rb_str_new2(md->value);
-}
-
-/* rb_cMetadata is the Metadata class whose instances proxy grpc_metadata. */
-VALUE rb_cMetadata = Qnil;
-void Init_grpc_metadata() {
-  rb_cMetadata =
-      rb_define_class_under(rb_mGrpcCore, "Metadata", rb_cObject);
-
-  /* Allocates an object managed by the ruby runtime */
-  rb_define_alloc_func(rb_cMetadata, grpc_rb_metadata_alloc);
-
-  /* Provides a ruby constructor and support for dup/clone. */
-  rb_define_method(rb_cMetadata, "initialize", grpc_rb_metadata_init, 2);
-  rb_define_method(rb_cMetadata, "initialize_copy", grpc_rb_metadata_init_copy,
-                   1);
-
-  /* Provides accessors for the code and details. */
-  rb_define_method(rb_cMetadata, "key", grpc_rb_metadata_key, 0);
-  rb_define_method(rb_cMetadata, "value", grpc_rb_metadata_value, 0);
-
-  id_key = rb_intern("__key");
-  id_value = rb_intern("__value");
-}
-
-/* Gets the wrapped metadata from the ruby wrapper */
-grpc_metadata *grpc_rb_get_wrapped_metadata(VALUE v) {
-  grpc_rb_metadata *wrapper = NULL;
-  Data_Get_Struct(v, grpc_rb_metadata, wrapper);
-  return wrapper->wrapped;
-}
diff --git a/src/ruby/ext/grpc/rb_server.c b/src/ruby/ext/grpc/rb_server.c
index c54f02e87afac11a2ea8f3c4a28406a460fe51dd..9a49285db283331cd9d5a0cabf7f6366abef6a8b 100644
--- a/src/ruby/ext/grpc/rb_server.c
+++ b/src/ruby/ext/grpc/rb_server.c
@@ -46,6 +46,9 @@
 /* rb_cServer is the ruby class that proxies grpc_server. */
 VALUE rb_cServer = Qnil;
 
+/* id_at is the constructor method of the ruby standard Time class. */
+static ID id_at;
+
 /* grpc_rb_server wraps a grpc_server.  It provides a peer ruby object,
   'mark' to minimize copying when a server is created from ruby. */
 typedef struct grpc_rb_server {
@@ -152,18 +155,89 @@ static VALUE grpc_rb_server_init_copy(VALUE copy, VALUE orig) {
   return copy;
 }
 
-static VALUE grpc_rb_server_request_call(VALUE self, VALUE tag_new) {
-  grpc_call_error err;
+/* request_call_stack holds various values used by the
+ * grpc_rb_server_request_call function */
+typedef struct request_call_stack {
+  grpc_call_details details;
+  grpc_metadata_array md_ary;
+} request_call_stack;
+
+/* grpc_request_call_stack_init ensures the request_call_stack is properly
+ * initialized */
+static void grpc_request_call_stack_init(request_call_stack* st) {
+  MEMZERO(st, request_call_stack, 1);
+  grpc_metadata_array_init(&st->md_ary);
+  grpc_call_details_init(&st->details);
+  st->details.method = NULL;
+  st->details.host = NULL;
+}
+
+/* grpc_request_call_stack_cleanup ensures the request_call_stack is properly
+ * cleaned up */
+static void grpc_request_call_stack_cleanup(request_call_stack* st) {
+  grpc_metadata_array_destroy(&st->md_ary);
+  grpc_call_details_destroy(&st->details);
+}
+
+/* call-seq:
+   cq = CompletionQueue.new
+   tag = Object.new
+   timeout = 10
+   server.request_call(cqueue, tag, timeout)
+
+   Requests notification of a new call on a server. */
+static VALUE grpc_rb_server_request_call(VALUE self, VALUE cqueue,
+                                         VALUE tag_new, VALUE timeout) {
   grpc_rb_server *s = NULL;
+  grpc_call *call = NULL;
+  grpc_event *ev = NULL;
+  grpc_call_error err;
+  request_call_stack st;
+  VALUE result;
   Data_Get_Struct(self, grpc_rb_server, s);
   if (s->wrapped == NULL) {
     rb_raise(rb_eRuntimeError, "closed!");
+    return Qnil;
   } else {
-    err = grpc_server_request_call_old(s->wrapped, ROBJECT(tag_new));
+    grpc_request_call_stack_init(&st);
+    /* call grpc_server_request_call, then wait for it to complete using
+     * pluck_event */
+    err = grpc_server_request_call(
+        s->wrapped, &call, &st.details, &st.md_ary,
+        grpc_rb_get_wrapped_completion_queue(cqueue),
+        ROBJECT(tag_new));
     if (err != GRPC_CALL_OK) {
-      rb_raise(rb_eCallError, "server request failed: %s (code=%d)",
+      grpc_request_call_stack_cleanup(&st);
+      rb_raise(rb_eCallError, "grpc_server_request_call failed: %s (code=%d)",
                grpc_call_error_detail_of(err), err);
+      return Qnil;
     }
+    ev = grpc_rb_completion_queue_pluck_event(cqueue, tag_new, timeout);
+    if (ev == NULL) {
+      grpc_request_call_stack_cleanup(&st);
+      return Qnil;
+    }
+    if (ev->data.op_complete != GRPC_OP_OK) {
+      grpc_request_call_stack_cleanup(&st);
+      grpc_event_finish(ev);
+      rb_raise(rb_eCallError, "request_call completion failed: (code=%d)",
+               ev->data.op_complete);
+      return Qnil;
+    }
+
+    /* build the NewServerRpc struct result */
+    result = rb_struct_new(
+        rb_sNewServerRpc,
+        rb_str_new2(st.details.method),
+        rb_str_new2(st.details.host),
+        rb_funcall(rb_cTime, id_at, 2, INT2NUM(st.details.deadline.tv_sec),
+                   INT2NUM(st.details.deadline.tv_nsec)),
+        grpc_rb_md_ary_to_h(&st.md_ary),
+        grpc_rb_wrap_call(call),
+        NULL);
+    grpc_event_finish(ev);
+    grpc_request_call_stack_cleanup(&st);
+    return result;
   }
   return Qnil;
 }
@@ -249,12 +323,13 @@ void Init_grpc_server() {
   rb_define_method(rb_cServer, "initialize_copy", grpc_rb_server_init_copy, 1);
 
   /* Add the server methods. */
-  rb_define_method(rb_cServer, "request_call", grpc_rb_server_request_call, 1);
+  rb_define_method(rb_cServer, "request_call", grpc_rb_server_request_call, 3);
   rb_define_method(rb_cServer, "start", grpc_rb_server_start, 0);
   rb_define_method(rb_cServer, "destroy", grpc_rb_server_destroy, 0);
   rb_define_alias(rb_cServer, "close", "destroy");
   rb_define_method(rb_cServer, "add_http2_port", grpc_rb_server_add_http2_port,
                    -1);
+  id_at = rb_intern("at");
 }
 
 /* Gets the wrapped server from the ruby wrapper */
diff --git a/src/ruby/lib/grpc.rb b/src/ruby/lib/grpc.rb
index dd02ef7666a8d1875931860e19c444882ac40dc2..b0f68035cd6d8dae0653333ac51c98ddaf8c9ee9 100644
--- a/src/ruby/lib/grpc.rb
+++ b/src/ruby/lib/grpc.rb
@@ -31,7 +31,6 @@ require 'grpc/errors'
 require 'grpc/grpc'
 require 'grpc/logconfig'
 require 'grpc/version'
-require 'grpc/core/event'
 require 'grpc/core/time_consts'
 require 'grpc/generic/active_call'
 require 'grpc/generic/client_stub'
diff --git a/src/ruby/lib/grpc/errors.rb b/src/ruby/lib/grpc/errors.rb
index 58944872b54196d5e810202c9fc6e60698e32099..b23793730f7b4e96ddd0411e16433c064d0325fb 100644
--- a/src/ruby/lib/grpc/errors.rb
+++ b/src/ruby/lib/grpc/errors.rb
@@ -31,10 +31,6 @@ require 'grpc'
 
 # GRPC contains the General RPC module.
 module GRPC
-  # OutOfTime is an exception class that indicates that an RPC exceeded its
-  # deadline.
-  OutOfTime = Class.new(StandardError)
-
   # BadStatus is an exception class that indicates that an error occurred at
   # either end of a GRPC connection.  When raised, it indicates that a status
   # error should be returned to the other end of a GRPC connection; when
diff --git a/src/ruby/lib/grpc/generic/active_call.rb b/src/ruby/lib/grpc/generic/active_call.rb
index 6256330e88e420a9d1c270b8760e0bdf7a9ffb45..489349c2c996fb4578c0fc0a13563b51d4613413 100644
--- a/src/ruby/lib/grpc/generic/active_call.rb
+++ b/src/ruby/lib/grpc/generic/active_call.rb
@@ -30,20 +30,14 @@
 require 'forwardable'
 require 'grpc/generic/bidi_call'
 
-def assert_event_type(ev, want)
-  fail OutOfTime if ev.nil?
-  got = ev.type
-  fail "Unexpected rpc event: got #{got}, want #{want}" unless got == want
-end
-
 # GRPC contains the General RPC module.
 module GRPC
   # The ActiveCall class provides simple methods for sending marshallable
   # data to a call
   class ActiveCall
-    include Core::CompletionType
     include Core::StatusCodes
     include Core::TimeConsts
+    include Core::CallOps
     attr_reader(:deadline)
 
     # client_invoke begins a client invocation.
@@ -61,15 +55,14 @@ module GRPC
     # @param q [CompletionQueue] the completion queue
     # @param deadline [Fixnum,TimeSpec] the deadline
     def self.client_invoke(call, q, _deadline, **kw)
-      fail(ArgumentError, 'not a call') unless call.is_a? Core::Call
+      fail(TypeError, '!Core::Call') unless call.is_a? Core::Call
       unless q.is_a? Core::CompletionQueue
-        fail(ArgumentError, 'not a CompletionQueue')
+        fail(TypeError, '!Core::CompletionQueue')
       end
-      call.add_metadata(kw) if kw.length > 0
-      client_metadata_read = Object.new
-      finished_tag = Object.new
-      call.invoke(q, client_metadata_read, finished_tag)
-      [finished_tag, client_metadata_read]
+      metadata_tag = Object.new
+      call.run_batch(q, metadata_tag, INFINITE_FUTURE,
+                     SEND_INITIAL_METADATA => kw)
+      metadata_tag
     end
 
     # Creates an ActiveCall.
@@ -91,25 +84,21 @@ module GRPC
     # @param marshal [Function] f(obj)->string that marshal requests
     # @param unmarshal [Function] f(string)->obj that unmarshals responses
     # @param deadline [Fixnum] the deadline for the call to complete
-    # @param finished_tag [Object] the object used as the call's finish tag,
-    #                              if the call has begun
-    # @param read_metadata_tag [Object] the object used as the call's finish
-    #                                   tag, if the call has begun
+    # @param metadata_tag [Object] the object use obtain metadata for clients
     # @param started [true|false] indicates if the call has begun
-    def initialize(call, q, marshal, unmarshal, deadline, finished_tag: nil,
-                   read_metadata_tag: nil, started: true)
-      fail(ArgumentError, 'not a call') unless call.is_a? Core::Call
+    def initialize(call, q, marshal, unmarshal, deadline, started: true,
+                   metadata_tag: nil)
+      fail(TypeError, '!Core::Call') unless call.is_a? Core::Call
       unless q.is_a? Core::CompletionQueue
-        fail(ArgumentError, 'not a CompletionQueue')
+        fail(TypeError, '!Core::CompletionQueue')
       end
       @call = call
       @cq = q
       @deadline = deadline
-      @finished_tag = finished_tag
-      @read_metadata_tag = read_metadata_tag
       @marshal = marshal
       @started = started
       @unmarshal = unmarshal
+      @metadata_tag = metadata_tag
     end
 
     # Obtains the status of the call.
@@ -176,51 +165,38 @@ module GRPC
 
     # writes_done indicates that all writes are completed.
     #
-    # It blocks until the remote endpoint acknowledges by sending a FINISHED
-    # event, unless assert_finished is set to false.  Any calls to
-    # #remote_send after this call will fail.
+    # It blocks until the remote endpoint acknowledges with at status unless
+    # assert_finished is set to false.  Any calls to #remote_send after this
+    # call will fail.
     #
     # @param assert_finished [true, false] when true(default), waits for
     # FINISHED.
     def writes_done(assert_finished = true)
-      @call.writes_done(self)
-      ev = @cq.pluck(self, INFINITE_FUTURE)
-      begin
-        assert_event_type(ev, FINISH_ACCEPTED)
-        logger.debug("Writes done: waiting for finish? #{assert_finished}")
-      ensure
-        ev.close
-      end
-
+      ops = {
+        SEND_CLOSE_FROM_CLIENT => nil
+      }
+      ops[RECV_STATUS_ON_CLIENT] = nil if assert_finished
+      @call.run_batch(@cq, self, INFINITE_FUTURE, ops)
       return unless assert_finished
-      ev = @cq.pluck(@finished_tag, INFINITE_FUTURE)
-      fail 'unexpected nil event' if ev.nil?
-      ev.close
       @call.status
     end
 
-    # finished waits until the call is completed.
+    # finished waits until a client call is completed.
     #
-    # It blocks until the remote endpoint acknowledges by sending a FINISHED
-    # event.
+    # It blocks until the remote endpoint acknowledges by sending a status.
     def finished
-      ev = @cq.pluck(@finished_tag, INFINITE_FUTURE)
-      begin
-        fail "unexpected event: #{ev.inspect}" unless ev.type == FINISHED
-        if @call.metadata.nil?
-          @call.metadata = ev.result.metadata
-        else
-          @call.metadata.merge!(ev.result.metadata)
-        end
-
-        if ev.result.code != Core::StatusCodes::OK
-          fail BadStatus.new(ev.result.code, ev.result.details)
-        end
-        res = ev.result
-      ensure
-        ev.close
+      batch_result = @call.run_batch(@cq, self, INFINITE_FUTURE,
+                                     RECV_STATUS_ON_CLIENT => nil)
+      if @call.metadata.nil?
+        @call.metadata = batch_result.metadata
+      elsif !batch_result.metadata.nil?
+        @call.metadata.merge!(batch_result.metadata)
       end
-      res
+      if batch_result.status.code != Core::StatusCodes::OK
+        fail BadStatus.new(batch_result.status.code,
+                           batch_result.status.details)
+      end
+      batch_result
     end
 
     # remote_send sends a request to the remote endpoint.
@@ -232,72 +208,50 @@ module GRPC
     # @param marshalled [false, true] indicates if the object is already
     # marshalled.
     def remote_send(req, marshalled = false)
-      assert_queue_is_ready
       logger.debug("sending #{req.inspect}, marshalled? #{marshalled}")
       if marshalled
         payload = req
       else
         payload = @marshal.call(req)
       end
-      @call.start_write(Core::ByteBuffer.new(payload), self)
-
-      # call queue#pluck, and wait for WRITE_ACCEPTED, so as not to return
-      # until the flow control allows another send on this call.
-      ev = @cq.pluck(self, INFINITE_FUTURE)
-      begin
-        assert_event_type(ev, WRITE_ACCEPTED)
-      ensure
-        ev.close
-      end
+      @call.run_batch(@cq, self, INFINITE_FUTURE, SEND_MESSAGE => payload)
     end
 
-    # send_status sends a status to the remote endpoint
+    # send_status sends a status to the remote endpoint.
     #
     # @param code [int] the status code to send
     # @param details [String] details
     # @param assert_finished [true, false] when true(default), waits for
     # FINISHED.
     def send_status(code = OK, details = '', assert_finished = false)
-      assert_queue_is_ready
-      @call.start_write_status(code, details, self)
-      ev = @cq.pluck(self, INFINITE_FUTURE)
-      begin
-        assert_event_type(ev, FINISH_ACCEPTED)
-      ensure
-        ev.close
-      end
-      logger.debug("Status sent: #{code}:'#{details}'")
-      return finished if assert_finished
+      ops = {
+        SEND_STATUS_FROM_SERVER => Struct::Status.new(code, details)
+      }
+      ops[RECV_CLOSE_ON_SERVER] = nil if assert_finished
+      @call.run_batch(@cq, self, INFINITE_FUTURE, ops)
       nil
     end
 
     # remote_read reads a response from the remote endpoint.
     #
-    # It blocks until the remote endpoint sends a READ or FINISHED event.  On
-    # a READ, it returns the response after unmarshalling it. On
-    # FINISHED, it returns nil if the status is OK, otherwise raising
-    # BadStatus
+    # It blocks until the remote endpoint replies with a message or status.
+    # On receiving a message, it returns the response after unmarshalling it.
+    # On receiving a status, it returns nil if the status is OK, otherwise
+    # raising BadStatus
     def remote_read
-      if @call.metadata.nil? && !@read_metadata_tag.nil?
-        ev = @cq.pluck(@read_metadata_tag, INFINITE_FUTURE)
-        assert_event_type(ev, CLIENT_METADATA_READ)
-        @call.metadata = ev.result
-        @read_metadata_tag = nil
+      ops = { RECV_MESSAGE => nil }
+      ops[RECV_INITIAL_METADATA] = nil unless @metadata_tag.nil?
+      batch_result = @call.run_batch(@cq, self, INFINITE_FUTURE, ops)
+      unless @metadata_tag.nil?
+        @call.metadata = batch_result.metadata
+        @metadata_tag = nil
       end
-
-      @call.start_read(self)
-      ev = @cq.pluck(self, INFINITE_FUTURE)
-      begin
-        assert_event_type(ev, READ)
-        logger.debug("received req: #{ev.result.inspect}")
-        unless ev.result.nil?
-          logger.debug("received req.to_s: #{ev.result}")
-          res = @unmarshal.call(ev.result.to_s)
-          logger.debug("received_req (unmarshalled): #{res.inspect}")
-          return res
-        end
-      ensure
-        ev.close
+      logger.debug("received req: #{batch_result}")
+      unless batch_result.nil? || batch_result.message.nil?
+        logger.debug("received req.to_s: #{batch_result.message}")
+        res = @unmarshal.call(batch_result.message)
+        logger.debug("received_req (unmarshalled): #{res.inspect}")
+        return res
       end
       logger.debug('found nil; the final response has been sent')
       nil
@@ -324,7 +278,6 @@ module GRPC
       return enum_for(:each_remote_read) unless block_given?
       loop do
         resp = remote_read
-        break if resp.is_a? Struct::Status  # is an OK status
         break if resp.nil?  # the last response was received
         yield resp
       end
@@ -461,8 +414,7 @@ module GRPC
     # @return [Enumerator, nil] a response Enumerator
     def bidi_streamer(requests, **kw, &blk)
       start_call(**kw) unless @started
-      bd = BidiCall.new(@call, @cq, @marshal, @unmarshal, @deadline,
-                        @finished_tag)
+      bd = BidiCall.new(@call, @cq, @marshal, @unmarshal, @deadline)
       bd.run_on_client(requests, &blk)
     end
 
@@ -478,8 +430,7 @@ module GRPC
     #
     # @param gen_each_reply [Proc] generates the BiDi stream replies
     def run_server_bidi(gen_each_reply)
-      bd = BidiCall.new(@call, @cq, @marshal, @unmarshal, @deadline,
-                        @finished_tag)
+      bd = BidiCall.new(@call, @cq, @marshal, @unmarshal, @deadline)
       bd.run_on_server(gen_each_reply)
     end
 
@@ -516,21 +467,5 @@ module GRPC
     # a Operation on the client.
     Operation = view_class(:cancel, :cancelled, :deadline, :execute,
                            :metadata, :status)
-
-    # confirms that no events are enqueued, and that the queue is not
-    # shutdown.
-    def assert_queue_is_ready
-      ev = nil
-      begin
-        ev = @cq.pluck(self, ZERO)
-        fail "unexpected event #{ev.inspect}" unless ev.nil?
-      rescue OutOfTime
-        logging.debug('timed out waiting for next event')
-        # expected, nothing should be on the queue and the deadline was ZERO,
-        # except things using another tag
-      ensure
-        ev.close unless ev.nil?
-      end
-    end
   end
 end
diff --git a/src/ruby/lib/grpc/generic/bidi_call.rb b/src/ruby/lib/grpc/generic/bidi_call.rb
index c66deaae60836e6396c269e65214da698e0f37a5..1c1b3b0db78a20d5491d81bb639559b74eda57e8 100644
--- a/src/ruby/lib/grpc/generic/bidi_call.rb
+++ b/src/ruby/lib/grpc/generic/bidi_call.rb
@@ -30,18 +30,12 @@
 require 'forwardable'
 require 'grpc/grpc'
 
-def assert_event_type(ev, want)
-  fail OutOfTime if ev.nil?
-  got = ev.type
-  fail("Unexpected rpc event: got #{got}, want #{want}") unless got == want
-end
-
 # GRPC contains the General RPC module.
 module GRPC
   # The BiDiCall class orchestrates exection of a BiDi stream on a client or
   # server.
   class BidiCall
-    include Core::CompletionType
+    include Core::CallOps
     include Core::StatusCodes
     include Core::TimeConsts
 
@@ -63,8 +57,7 @@ module GRPC
     # @param marshal [Function] f(obj)->string that marshal requests
     # @param unmarshal [Function] f(string)->obj that unmarshals responses
     # @param deadline [Fixnum] the deadline for the call to complete
-    # @param finished_tag [Object] the object used as the call's finish tag,
-    def initialize(call, q, marshal, unmarshal, deadline, finished_tag)
+    def initialize(call, q, marshal, unmarshal, deadline)
       fail(ArgumentError, 'not a call') unless call.is_a? Core::Call
       unless q.is_a? Core::CompletionQueue
         fail(ArgumentError, 'not a CompletionQueue')
@@ -72,7 +65,6 @@ module GRPC
       @call = call
       @cq = q
       @deadline = deadline
-      @finished_tag = finished_tag
       @marshal = marshal
       @readq = Queue.new
       @unmarshal = unmarshal
@@ -146,30 +138,14 @@ module GRPC
           requests.each do |req|
             count += 1
             payload = @marshal.call(req)
-            @call.start_write(Core::ByteBuffer.new(payload), write_tag)
-            ev = @cq.pluck(write_tag, INFINITE_FUTURE)
-            begin
-              assert_event_type(ev, WRITE_ACCEPTED)
-            ensure
-              ev.close
-            end
+            @call.run_batch(@cq, write_tag, INFINITE_FUTURE,
+                            SEND_MESSAGE => payload)
           end
           if is_client
-            @call.writes_done(write_tag)
-            ev = @cq.pluck(write_tag, INFINITE_FUTURE)
-            begin
-              assert_event_type(ev, FINISH_ACCEPTED)
-            ensure
-              ev.close
-            end
             logger.debug("bidi-client: sent #{count} reqs, waiting to finish")
-            ev = @cq.pluck(@finished_tag, INFINITE_FUTURE)
-            begin
-              assert_event_type(ev, FINISHED)
-            ensure
-              ev.close
-            end
-            logger.debug('bidi-client: finished received')
+            @call.run_batch(@cq, write_tag, INFINITE_FUTURE,
+                            SEND_CLOSE_FROM_CLIENT => nil,
+                            RECV_STATUS_ON_CLIENT => nil)
           end
         rescue StandardError => e
           logger.warn('bidi: write_loop failed')
@@ -189,25 +165,20 @@ module GRPC
           loop do
             logger.debug("waiting for read #{count}")
             count += 1
-            @call.start_read(read_tag)
-            ev = @cq.pluck(read_tag, INFINITE_FUTURE)
-            begin
-              assert_event_type(ev, READ)
-
-              # handle the next event.
-              if ev.result.nil?
-                @readq.push(END_OF_READS)
-                logger.debug('done reading!')
-                break
-              end
-
-              # push the latest read onto the queue and continue reading
-              logger.debug("received req: #{ev.result}")
-              res = @unmarshal.call(ev.result.to_s)
-              @readq.push(res)
-            ensure
-              ev.close
+            # TODO: ensure metadata is read if available, currently it's not
+            batch_result = @call.run_batch(@cq, read_tag, INFINITE_FUTURE,
+                                           RECV_MESSAGE => nil)
+            # handle the next message
+            if batch_result.message.nil?
+              @readq.push(END_OF_READS)
+              logger.debug('done reading!')
+              break
             end
+
+            # push the latest read onto the queue and continue reading
+            logger.debug("received req: #{batch_result.message}")
+            res = @unmarshal.call(batch_result.message)
+            @readq.push(res)
           end
 
         rescue StandardError => e
diff --git a/src/ruby/lib/grpc/generic/client_stub.rb b/src/ruby/lib/grpc/generic/client_stub.rb
index 01328d4a5bc68895716942b1f360ed0c9b911d7e..6547a1499ec881e516f3da416c3eaf1dd089e4ee 100644
--- a/src/ruby/lib/grpc/generic/client_stub.rb
+++ b/src/ruby/lib/grpc/generic/client_stub.rb
@@ -35,9 +35,10 @@ module GRPC
   # ClientStub represents an endpoint used to send requests to GRPC servers.
   class ClientStub
     include Core::StatusCodes
+    include Core::TimeConsts
 
-    # Default deadline is 5 seconds.
-    DEFAULT_DEADLINE = 5
+    # Default timeout is 5 seconds.
+    DEFAULT_TIMEOUT = 5
 
     # setup_channel is used by #initialize to constuct a channel from its
     # arguments.
@@ -76,8 +77,8 @@ module GRPC
     # present the host and arbitrary keyword arg areignored, and the RPC
     # connection uses this channel.
     #
-    # - :deadline
-    # when present, this is the default deadline used for calls
+    # - :timeout
+    # when present, this is the default timeout used for calls
     #
     # - :update_metadata
     # when present, this a func that takes a hash and returns a hash
@@ -87,13 +88,13 @@ module GRPC
     # @param host [String] the host the stub connects to
     # @param q [Core::CompletionQueue] used to wait for events
     # @param channel_override [Core::Channel] a pre-created channel
-    # @param deadline [Number] the default deadline to use in requests
+    # @param timeout [Number] the default timeout to use in requests
     # @param creds [Core::Credentials] the channel
     # @param update_metadata a func that updates metadata as described above
     # @param kw [KeywordArgs]the channel arguments
     def initialize(host, q,
                    channel_override: nil,
-                   deadline: DEFAULT_DEADLINE,
+                   timeout: nil,
                    creds: nil,
                    update_metadata: nil,
                    **kw)
@@ -103,7 +104,7 @@ module GRPC
       @update_metadata = ClientStub.check_update_metadata(update_metadata)
       alt_host = kw[Core::Channel::SSL_TARGET]
       @host = alt_host.nil? ? host : alt_host
-      @deadline = deadline
+      @timeout = timeout.nil? ? DEFAULT_TIMEOUT : timeout
     end
 
     # request_response sends a request to a GRPC server, and returns the
@@ -140,12 +141,12 @@ module GRPC
     # @param req [Object] the request sent to the server
     # @param marshal [Function] f(obj)->string that marshals requests
     # @param unmarshal [Function] f(string)->obj that unmarshals responses
-    # @param deadline [Numeric] (optional) the max completion time in seconds
+    # @param timeout [Numeric] (optional) the max completion time in seconds
     # @param return_op [true|false] return an Operation if true
     # @return [Object] the response received from the server
-    def request_response(method, req, marshal, unmarshal, deadline = nil,
+    def request_response(method, req, marshal, unmarshal, timeout = nil,
                          return_op: false, **kw)
-      c = new_active_call(method, marshal, unmarshal, deadline || @deadline)
+      c = new_active_call(method, marshal, unmarshal, timeout)
       md = @update_metadata.nil? ? kw : @update_metadata.call(kw.clone)
       return c.request_response(req, **md) unless return_op
 
@@ -197,12 +198,12 @@ module GRPC
     # @param requests [Object] an Enumerable of requests to send
     # @param marshal [Function] f(obj)->string that marshals requests
     # @param unmarshal [Function] f(string)->obj that unmarshals responses
-    # @param deadline [Numeric] the max completion time in seconds
+    # @param timeout [Numeric] the max completion time in seconds
     # @param return_op [true|false] return an Operation if true
     # @return [Object|Operation] the response received from the server
-    def client_streamer(method, requests, marshal, unmarshal, deadline = nil,
+    def client_streamer(method, requests, marshal, unmarshal, timeout = nil,
                         return_op: false, **kw)
-      c = new_active_call(method, marshal, unmarshal, deadline || @deadline)
+      c = new_active_call(method, marshal, unmarshal, timeout)
       md = @update_metadata.nil? ? kw : @update_metadata.call(kw.clone)
       return c.client_streamer(requests, **md) unless return_op
 
@@ -262,13 +263,13 @@ module GRPC
     # @param req [Object] the request sent to the server
     # @param marshal [Function] f(obj)->string that marshals requests
     # @param unmarshal [Function] f(string)->obj that unmarshals responses
-    # @param deadline [Numeric] the max completion time in seconds
+    # @param timeout [Numeric] the max completion time in seconds
     # @param return_op [true|false]return an Operation if true
     # @param blk [Block] when provided, is executed for each response
     # @return [Enumerator|Operation|nil] as discussed above
-    def server_streamer(method, req, marshal, unmarshal, deadline = nil,
+    def server_streamer(method, req, marshal, unmarshal, timeout = nil,
                         return_op: false, **kw, &blk)
-      c = new_active_call(method, marshal, unmarshal, deadline || @deadline)
+      c = new_active_call(method, marshal, unmarshal, timeout)
       md = @update_metadata.nil? ? kw : @update_metadata.call(kw.clone)
       return c.server_streamer(req, **md, &blk) unless return_op
 
@@ -367,13 +368,13 @@ module GRPC
     # @param requests [Object] an Enumerable of requests to send
     # @param marshal [Function] f(obj)->string that marshals requests
     # @param unmarshal [Function] f(string)->obj that unmarshals responses
-    # @param deadline [Numeric] (optional) the max completion time in seconds
+    # @param timeout [Numeric] (optional) the max completion time in seconds
     # @param blk [Block] when provided, is executed for each response
     # @param return_op [true|false] return an Operation if true
     # @return [Enumerator|nil|Operation] as discussed above
-    def bidi_streamer(method, requests, marshal, unmarshal, deadline = nil,
+    def bidi_streamer(method, requests, marshal, unmarshal, timeout = nil,
                       return_op: false, **kw, &blk)
-      c = new_active_call(method, marshal, unmarshal, deadline || @deadline)
+      c = new_active_call(method, marshal, unmarshal, timeout)
       md = @update_metadata.nil? ? kw : @update_metadata.call(kw.clone)
       return c.bidi_streamer(requests, **md, &blk) unless return_op
 
@@ -390,15 +391,14 @@ module GRPC
 
     # Creates a new active stub
     #
-    # @param ch [GRPC::Channel] the channel used to create the stub.
+    # @param method [string] the method being called.
     # @param marshal [Function] f(obj)->string that marshals requests
     # @param unmarshal [Function] f(string)->obj that unmarshals responses
-    # @param deadline [TimeConst]
-    def new_active_call(ch, marshal, unmarshal, deadline = nil)
-      absolute_deadline = Core::TimeConsts.from_relative_time(deadline)
-      call = @ch.create_call(ch, @host, absolute_deadline)
-      ActiveCall.new(call, @queue, marshal, unmarshal, absolute_deadline,
-                     started: false)
+    # @param timeout [TimeConst]
+    def new_active_call(method, marshal, unmarshal, timeout = nil)
+      deadline = from_relative_time(timeout.nil? ? @timeout : timeout)
+      call = @ch.create_call(@queue, method, @host, deadline)
+      ActiveCall.new(call, @queue, marshal, unmarshal, deadline, started: false)
     end
   end
 end
diff --git a/src/ruby/lib/grpc/generic/rpc_desc.rb b/src/ruby/lib/grpc/generic/rpc_desc.rb
index 2cb3d2eebf43744be89af19c5caa972c1985fbe5..3e48b8e51d723dba00f54e058b4df809d610d28c 100644
--- a/src/ruby/lib/grpc/generic/rpc_desc.rb
+++ b/src/ruby/lib/grpc/generic/rpc_desc.rb
@@ -81,7 +81,6 @@ module GRPC
         active_call.run_server_bidi(mth)
       end
       send_status(active_call, OK, 'OK')
-      active_call.finished
     rescue BadStatus => e
       # this is raised by handlers that want GRPC to send an application
       # error code and detail message.
@@ -91,15 +90,11 @@ module GRPC
       # This is raised by GRPC internals but should rarely, if ever happen.
       # Log it, but don't notify the other endpoint..
       logger.warn("failed call: #{active_call}\n#{e}")
-    rescue OutOfTime
+    rescue Core::OutOfTime
       # This is raised when active_call#method.call exceeeds the deadline
       # event.  Send a status of deadline exceeded
       logger.warn("late call: #{active_call}")
       send_status(active_call, DEADLINE_EXCEEDED, 'late')
-    rescue Core::EventError => e
-      # This is raised by GRPC internals but should rarely, if ever happen.
-      # Log it, but don't notify the other endpoint..
-      logger.warn("failed call: #{active_call}\n#{e}")
     rescue StandardError => e
       # This will usuaally be an unhandled error in the handling code.
       # Send back a UNKNOWN status to the client
@@ -142,7 +137,7 @@ module GRPC
 
     def send_status(active_client, code, details)
       details = 'Not sure why' if details.nil?
-      active_client.send_status(code, details)
+      active_client.send_status(code, details, code == OK)
     rescue StandardError => e
       logger.warn("Could not send status #{code}:#{details}")
       logger.warn(e)
diff --git a/src/ruby/lib/grpc/generic/rpc_server.rb b/src/ruby/lib/grpc/generic/rpc_server.rb
index 35e84023be952df4fa5e846a14a8d26d4c166e26..30a4bf15325c15c4769a2b461ce24ee9d494f68c 100644
--- a/src/ruby/lib/grpc/generic/rpc_server.rb
+++ b/src/ruby/lib/grpc/generic/rpc_server.rb
@@ -38,7 +38,7 @@ module GRPC
   # RpcServer hosts a number of services and makes them available on the
   # network.
   class RpcServer
-    include Core::CompletionType
+    include Core::CallOps
     include Core::TimeConsts
     extend ::Forwardable
 
@@ -202,20 +202,14 @@ module GRPC
       end
       @pool.start
       @server.start
-      server_tag = Object.new
+      request_call_tag = Object.new
       until stopped?
-        @server.request_call(server_tag)
-        ev = @cq.pluck(server_tag, @poll_period)
-        next if ev.nil?
-        if ev.type != SERVER_RPC_NEW
-          logger.warn("bad evt: got:#{ev.type}, want:#{SERVER_RPC_NEW}")
-          ev.close
-          next
-        end
-        c = new_active_server_call(ev.call, ev.result)
+        deadline = from_relative_time(@poll_period)
+        an_rpc = @server.request_call(@cq, request_call_tag, deadline)
+        next if an_rpc.nil?
+        c = new_active_server_call(an_rpc)
         unless c.nil?
-          mth = ev.result.method.to_sym
-          ev.close
+          mth = an_rpc.method.to_sym
           @pool.schedule(c) do |call|
             rpc_descs[mth].run_server_method(call, rpc_handlers[mth])
           end
@@ -224,46 +218,49 @@ module GRPC
       @running = false
     end
 
-    def new_active_server_call(call, new_server_rpc)
-      # Accept the call.  This is necessary even if a status is to be sent
-      # back immediately
-      finished_tag = Object.new
-      call_queue = Core::CompletionQueue.new
-      call.metadata = new_server_rpc.metadata  # store the metadata
-      call.server_accept(call_queue, finished_tag)
-      call.server_end_initial_metadata
-
-      # Send UNAVAILABLE if there are too many unprocessed jobs
+    # Sends UNAVAILABLE if there are too many unprocessed jobs
+    def available?(an_rpc)
       jobs_count, max = @pool.jobs_waiting, @max_waiting_requests
       logger.info("waiting: #{jobs_count}, max: #{max}")
-      if @pool.jobs_waiting > @max_waiting_requests
-        logger.warn("NOT AVAILABLE: too many jobs_waiting: #{new_server_rpc}")
-        noop = proc { |x| x }
-        c = ActiveCall.new(call, call_queue, noop, noop,
-                           new_server_rpc.deadline,
-                           finished_tag: finished_tag)
-        c.send_status(StatusCodes::UNAVAILABLE, '')
-        return nil
-      end
+      return an_rpc if @pool.jobs_waiting <= @max_waiting_requests
+      logger.warn("NOT AVAILABLE: too many jobs_waiting: #{an_rpc}")
+      noop = proc { |x| x }
+      c = ActiveCall.new(an_rpc.call, @cq, noop, noop, an_rpc.deadline)
+      c.send_status(StatusCodes::UNAVAILABLE, '')
+      nil
+    end
 
-      # Send NOT_FOUND if the method does not exist
-      mth = new_server_rpc.method.to_sym
-      unless rpc_descs.key?(mth)
-        logger.warn("NOT_FOUND: #{new_server_rpc}")
-        noop = proc { |x| x }
-        c = ActiveCall.new(call, call_queue, noop, noop,
-                           new_server_rpc.deadline,
-                           finished_tag: finished_tag)
-        c.send_status(StatusCodes::NOT_FOUND, '')
-        return nil
-      end
+    # Sends NOT_FOUND if the method can't be found
+    def found?(an_rpc)
+      mth = an_rpc.method.to_sym
+      return an_rpc if rpc_descs.key?(mth)
+      logger.warn("NOT_FOUND: #{an_rpc}")
+      noop = proc { |x| x }
+      c = ActiveCall.new(an_rpc.call, @cq, noop, noop, an_rpc.deadline)
+      c.send_status(StatusCodes::NOT_FOUND, '')
+      nil
+    end
+
+    def new_active_server_call(an_rpc)
+      # Accept the call.  This is necessary even if a status is to be sent
+      # back immediately
+      return nil if an_rpc.nil? || an_rpc.call.nil?
+
+      # allow the metadata to be accessed from the call
+      handle_call_tag = Object.new
+      an_rpc.call.metadata = an_rpc.metadata
+      # TODO: add a hook to send md
+      an_rpc.call.run_batch(@cq, handle_call_tag, INFINITE_FUTURE,
+                            SEND_INITIAL_METADATA => nil)
+      return nil unless available?(an_rpc)
+      return nil unless found?(an_rpc)
 
       # Create the ActiveCall
-      rpc_desc = rpc_descs[mth]
-      logger.info("deadline is #{new_server_rpc.deadline}; (now=#{Time.now})")
-      ActiveCall.new(call, call_queue,
+      logger.info("deadline is #{an_rpc.deadline}; (now=#{Time.now})")
+      rpc_desc = rpc_descs[an_rpc.method.to_sym]
+      ActiveCall.new(an_rpc.call, @cq,
                      rpc_desc.marshal_proc, rpc_desc.unmarshal_proc(:input),
-                     new_server_rpc.deadline, finished_tag: finished_tag)
+                     an_rpc.deadline)
     end
 
     # Pool is a simple thread pool for running server requests.
diff --git a/src/ruby/lib/grpc/version.rb b/src/ruby/lib/grpc/version.rb
index 513a53724f3cf89ecfc664c50265efe35717f047..bfd0cbb3936d67e6952c624f0b1df3ffb4841681 100644
--- a/src/ruby/lib/grpc/version.rb
+++ b/src/ruby/lib/grpc/version.rb
@@ -29,5 +29,5 @@
 
 # GRPC contains the General RPC module.
 module GRPC
-  VERSION = '0.5.0'
+  VERSION = '0.6.0'
 end
diff --git a/src/ruby/spec/alloc_spec.rb b/src/ruby/spec/alloc_spec.rb
deleted file mode 100644
index 88e7e2b3e7ac10441f5cad7af6fe28c888449da1..0000000000000000000000000000000000000000
--- a/src/ruby/spec/alloc_spec.rb
+++ /dev/null
@@ -1,44 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-require 'grpc'
-
-describe 'Wrapped classes where .new cannot create an instance' do
-  describe GRPC::Core::Event do
-    it 'should fail .new fail with a runtime error' do
-      expect { GRPC::Core::Event.new }.to raise_error(TypeError)
-    end
-  end
-
-  describe GRPC::Core::Call do
-    it 'should fail .new fail with a runtime error' do
-      expect { GRPC::Core::Event.new }.to raise_error(TypeError)
-    end
-  end
-end
diff --git a/src/ruby/spec/byte_buffer_spec.rb b/src/ruby/spec/byte_buffer_spec.rb
deleted file mode 100644
index e1833ebb3a0b479da1bae75f4aa8378cc282fb1a..0000000000000000000000000000000000000000
--- a/src/ruby/spec/byte_buffer_spec.rb
+++ /dev/null
@@ -1,67 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-require 'grpc'
-
-describe GRPC::Core::ByteBuffer do
-  describe '#new' do
-    it 'is constructed from a string' do
-      expect { GRPC::Core::ByteBuffer.new('#new') }.not_to raise_error
-    end
-
-    it 'can be constructed from the empty string' do
-      expect { GRPC::Core::ByteBuffer.new('') }.not_to raise_error
-    end
-
-    it 'cannot be constructed from nil' do
-      expect { GRPC::Core::ByteBuffer.new(nil) }.to raise_error TypeError
-    end
-
-    it 'cannot be constructed from non-strings' do
-      [1, Object.new, :a_symbol].each do |x|
-        expect { GRPC::Core::ByteBuffer.new(x) }.to raise_error TypeError
-      end
-    end
-  end
-
-  describe '#to_s' do
-    it 'is the string value the ByteBuffer was constructed with' do
-      expect(GRPC::Core::ByteBuffer.new('#to_s').to_s).to eq('#to_s')
-    end
-  end
-
-  describe '#dup' do
-    it 'makes an instance whose #to_s is the original string value' do
-      bb = GRPC::Core::ByteBuffer.new('#dup')
-      a_copy = bb.dup
-      expect(a_copy.to_s).to eq('#dup')
-      expect(a_copy.dup.to_s).to eq('#dup')
-    end
-  end
-end
diff --git a/src/ruby/spec/call_spec.rb b/src/ruby/spec/call_spec.rb
index 26175645719e31f5cf4e6c8bf509f9be0e47644f..4977c10a7e183fcd692b652c507454546967682a 100644
--- a/src/ruby/spec/call_spec.rb
+++ b/src/ruby/spec/call_spec.rb
@@ -66,51 +66,34 @@ describe GRPC::Core::RpcErrors do
   end
 end
 
-describe GRPC::Core::Call do
+describe GRPC::Core::CallOps do
   before(:each) do
-    @tag = Object.new
-    @client_queue = GRPC::Core::CompletionQueue.new
-    fake_host = 'localhost:10101'
-    @ch = GRPC::Core::Channel.new(fake_host, nil)
-  end
-
-  describe '#start_read' do
-    xit 'should fail if called immediately' do
-      blk = proc { make_test_call.start_read(@tag) }
-      expect(&blk).to raise_error GRPC::Core::CallError
-    end
-  end
-
-  describe '#start_write' do
-    xit 'should fail if called immediately' do
-      bytes = GRPC::Core::ByteBuffer.new('test string')
-      blk = proc { make_test_call.start_write(bytes, @tag) }
-      expect(&blk).to raise_error GRPC::Core::CallError
-    end
+    @known_types = {
+      SEND_INITIAL_METADATA: 0,
+      SEND_MESSAGE: 1,
+      SEND_CLOSE_FROM_CLIENT: 2,
+      SEND_STATUS_FROM_SERVER: 3,
+      RECV_INITIAL_METADATA: 4,
+      RECV_MESSAGE: 5,
+      RECV_STATUS_ON_CLIENT: 6,
+      RECV_CLOSE_ON_SERVER: 7
+    }
   end
 
-  describe '#start_write_status' do
-    xit 'should fail if called immediately' do
-      blk = proc { make_test_call.start_write_status(153, 'x', @tag) }
-      expect(&blk).to raise_error GRPC::Core::CallError
-    end
+  it 'should have symbols for all the known operation types' do
+    m = GRPC::Core::CallOps
+    syms_and_codes = m.constants.collect { |c| [c, m.const_get(c)] }
+    expect(Hash[syms_and_codes]).to eq(@known_types)
   end
+end
 
-  describe '#writes_done' do
-    xit 'should fail if called immediately' do
-      blk = proc { make_test_call.writes_done(Object.new) }
-      expect(&blk).to raise_error GRPC::Core::CallError
-    end
-  end
+describe GRPC::Core::Call do
+  let(:client_queue) { GRPC::Core::CompletionQueue.new }
+  let(:test_tag)  { Object.new }
+  let(:fake_host) { 'localhost:10101' }
 
-  describe '#add_metadata' do
-    it 'adds metadata to a call without fail' do
-      call = make_test_call
-      n = 37
-      one_md = proc { |x| [sprintf('key%d', x), sprintf('value%d', x)] }
-      metadata = Hash[n.times.collect { |i| one_md.call i }]
-      expect { call.add_metadata(metadata) }.to_not raise_error
-    end
+  before(:each) do
+    @ch = GRPC::Core::Channel.new(fake_host, nil)
   end
 
   describe '#status' do
@@ -154,7 +137,7 @@ describe GRPC::Core::Call do
   end
 
   def make_test_call
-    @ch.create_call('dummy_method', 'dummy_host', deadline)
+    @ch.create_call(client_queue, 'dummy_method', 'dummy_host', deadline)
   end
 
   def deadline
diff --git a/src/ruby/spec/channel_spec.rb b/src/ruby/spec/channel_spec.rb
index af73294abe429ad80478f42d8591fbb4afc53e62..31e38d71b81ee71aeaefa634db7a2e7d87024832 100644
--- a/src/ruby/spec/channel_spec.rb
+++ b/src/ruby/spec/channel_spec.rb
@@ -36,16 +36,13 @@ def load_test_certs
 end
 
 describe GRPC::Core::Channel do
-  FAKE_HOST = 'localhost:0'
+  let(:fake_host) { 'localhost:0' }
+  let(:cq) { GRPC::Core::CompletionQueue.new }
 
   def create_test_cert
     GRPC::Core::Credentials.new(load_test_certs[0])
   end
 
-  before(:each) do
-    @cq = GRPC::Core::CompletionQueue.new
-  end
-
   shared_examples '#new' do
     it 'take a host name without channel args' do
       expect { GRPC::Core::Channel.new('dummy_host', nil) }.not_to raise_error
@@ -115,25 +112,23 @@ describe GRPC::Core::Channel do
 
   describe '#create_call' do
     it 'creates a call OK' do
-      host = FAKE_HOST
-      ch = GRPC::Core::Channel.new(host, nil)
+      ch = GRPC::Core::Channel.new(fake_host, nil)
 
       deadline = Time.now + 5
 
       blk = proc do
-        ch.create_call('dummy_method', 'dummy_host', deadline)
+        ch.create_call(cq, 'dummy_method', 'dummy_host', deadline)
       end
       expect(&blk).to_not raise_error
     end
 
     it 'raises an error if called on a closed channel' do
-      host = FAKE_HOST
-      ch = GRPC::Core::Channel.new(host, nil)
+      ch = GRPC::Core::Channel.new(fake_host, nil)
       ch.close
 
       deadline = Time.now + 5
       blk = proc do
-        ch.create_call('dummy_method', 'dummy_host', deadline)
+        ch.create_call(cq, 'dummy_method', 'dummy_host', deadline)
       end
       expect(&blk).to raise_error(RuntimeError)
     end
@@ -141,15 +136,13 @@ describe GRPC::Core::Channel do
 
   describe '#destroy' do
     it 'destroys a channel ok' do
-      host = FAKE_HOST
-      ch = GRPC::Core::Channel.new(host, nil)
+      ch = GRPC::Core::Channel.new(fake_host, nil)
       blk = proc { ch.destroy }
       expect(&blk).to_not raise_error
     end
 
     it 'can be called more than once without error' do
-      host = FAKE_HOST
-      ch = GRPC::Core::Channel.new(host, nil)
+      ch = GRPC::Core::Channel.new(fake_host, nil)
       blk = proc { ch.destroy }
       blk.call
       expect(&blk).to_not raise_error
@@ -164,15 +157,13 @@ describe GRPC::Core::Channel do
 
   describe '#close' do
     it 'closes a channel ok' do
-      host = FAKE_HOST
-      ch = GRPC::Core::Channel.new(host, nil)
+      ch = GRPC::Core::Channel.new(fake_host, nil)
       blk = proc { ch.close }
       expect(&blk).to_not raise_error
     end
 
     it 'can be called more than once without error' do
-      host = FAKE_HOST
-      ch = GRPC::Core::Channel.new(host, nil)
+      ch = GRPC::Core::Channel.new(fake_host, nil)
       blk = proc { ch.close }
       blk.call
       expect(&blk).to_not raise_error
diff --git a/src/ruby/spec/client_server_spec.rb b/src/ruby/spec/client_server_spec.rb
index 49a2d3bb4df9fd00b7f5955b3fb70f66bba77e6d..1a2afbe1f9a72161b951d204635913b2edf2429a 100644
--- a/src/ruby/spec/client_server_spec.rb
+++ b/src/ruby/spec/client_server_spec.rb
@@ -30,7 +30,6 @@
 require 'grpc'
 require 'spec_helper'
 
-include GRPC::Core::CompletionType
 include GRPC::Core
 
 def load_test_certs
@@ -40,6 +39,8 @@ def load_test_certs
 end
 
 shared_context 'setup: tags' do
+  let(:sent_message) { 'sent message' }
+  let(:reply_text) { 'the reply' }
   before(:example) do
     @server_finished_tag = Object.new
     @client_finished_tag = Object.new
@@ -52,153 +53,136 @@ shared_context 'setup: tags' do
     Time.now + 2
   end
 
-  def expect_next_event_on(queue, type, tag)
-    ev = queue.pluck(tag, deadline)
-    if type.nil?
-      expect(ev).to be_nil
-    else
-      expect(ev).to_not be_nil
-      expect(ev.type).to be(type)
-    end
-    ev
-  end
-
   def server_allows_client_to_proceed
-    @server.request_call(@server_tag)
-    ev = @server_queue.pluck(@server_tag, deadline)
-    expect(ev).not_to be_nil
-    expect(ev.type).to be(SERVER_RPC_NEW)
-    server_call = ev.call
-    server_call.server_accept(@server_queue, @server_finished_tag)
-    server_call.server_end_initial_metadata
+    recvd_rpc = @server.request_call(@server_queue, @server_tag, deadline)
+    expect(recvd_rpc).to_not eq nil
+    server_call = recvd_rpc.call
+    ops = { CallOps::SEND_INITIAL_METADATA => {} }
+    svr_batch = server_call.run_batch(@server_queue, @server_tag, deadline, ops)
+    expect(svr_batch.send_metadata).to be true
     server_call
   end
 
-  def server_responds_with(server_call, reply_text)
-    reply = ByteBuffer.new(reply_text)
-    server_call.start_read(@server_tag)
-    ev = @server_queue.pluck(@server_tag, TimeConsts::INFINITE_FUTURE)
-    expect(ev.type).to be(READ)
-    server_call.start_write(reply, @server_tag)
-    ev = @server_queue.pluck(@server_tag, TimeConsts::INFINITE_FUTURE)
-    expect(ev).not_to be_nil
-    expect(ev.type).to be(WRITE_ACCEPTED)
-  end
-
-  def client_sends(call, sent = 'a message')
-    req = ByteBuffer.new(sent)
-    call.start_write(req, @tag)
-    ev = @client_queue.pluck(@tag, TimeConsts::INFINITE_FUTURE)
-    expect(ev).not_to be_nil
-    expect(ev.type).to be(WRITE_ACCEPTED)
-    sent
-  end
-
   def new_client_call
-    @ch.create_call('/method', 'foo.test.google.fr', deadline)
+    @ch.create_call(@client_queue, '/method', 'foo.test.google.fr', deadline)
   end
 end
 
 shared_examples 'basic GRPC message delivery is OK' do
+  include GRPC::Core
   include_context 'setup: tags'
 
-  it 'servers receive requests from clients and start responding' do
-    reply = ByteBuffer.new('the server payload')
+  it 'servers receive requests from clients and can respond' do
     call = new_client_call
-    call.invoke(@client_queue, @client_metadata_tag, @client_finished_tag)
-
-    # check the server rpc new was received
-    # @server.request_call(@server_tag)
-    # ev = expect_next_event_on(@server_queue, SERVER_RPC_NEW, @server_tag)
-
-    # accept the call
-    # server_call = ev.call
-    # server_call.server_accept(@server_queue, @server_finished_tag)
-    # server_call.server_end_initial_metadata
-    server_call = server_allows_client_to_proceed
-
-    # client sends a message
-    msg = client_sends(call)
+    client_ops = {
+      CallOps::SEND_INITIAL_METADATA => {},
+      CallOps::SEND_MESSAGE => sent_message
+    }
+    batch_result = call.run_batch(@client_queue, @client_tag, deadline,
+                                  client_ops)
+    expect(batch_result.send_metadata).to be true
+    expect(batch_result.send_message).to be true
 
     # confirm the server can read the inbound message
-    server_call.start_read(@server_tag)
-    ev = expect_next_event_on(@server_queue, READ, @server_tag)
-    expect(ev.result.to_s).to eq(msg)
-
-    #  the server response
-    server_call.start_write(reply, @server_tag)
-    expect_next_event_on(@server_queue, WRITE_ACCEPTED, @server_tag)
+    server_call = server_allows_client_to_proceed
+    server_ops = {
+      CallOps::RECV_MESSAGE => nil
+    }
+    svr_batch = server_call.run_batch(@server_queue, @server_tag, deadline,
+                                      server_ops)
+    expect(svr_batch.message).to eq(sent_message)
   end
 
   it 'responses written by servers are received by the client' do
     call = new_client_call
-    call.invoke(@client_queue, @client_metadata_tag, @client_finished_tag)
-    server_call = server_allows_client_to_proceed
-    client_sends(call)
-    server_responds_with(server_call, 'server_response')
+    client_ops = {
+      CallOps::SEND_INITIAL_METADATA => {},
+      CallOps::SEND_MESSAGE => sent_message
+    }
+    batch_result = call.run_batch(@client_queue, @client_tag, deadline,
+                                  client_ops)
+    expect(batch_result.send_metadata).to be true
+    expect(batch_result.send_message).to be true
 
-    call.start_read(@tag)
-    ev = expect_next_event_on(@client_queue, READ, @tag)
-    expect(ev.result.to_s).to eq('server_response')
+    # confirm the server can read the inbound message
+    server_call = server_allows_client_to_proceed
+    server_ops = {
+      CallOps::RECV_MESSAGE => nil,
+      CallOps::SEND_MESSAGE => reply_text
+    }
+    svr_batch = server_call.run_batch(@server_queue, @server_tag, deadline,
+                                      server_ops)
+    expect(svr_batch.message).to eq(sent_message)
+    expect(svr_batch.send_message).to be true
   end
 
   it 'servers can ignore a client write and send a status' do
     call = new_client_call
-    call.invoke(@client_queue, @client_metadata_tag, @client_finished_tag)
-
-    # check the server rpc new was received
-    @server.request_call(@server_tag)
-    ev = expect_next_event_on(@server_queue, SERVER_RPC_NEW, @server_tag)
-    expect(ev.tag).to be(@server_tag)
-
-    # accept the call - need to do this to sent status.
-    server_call = ev.call
-    server_call.server_accept(@server_queue, @server_finished_tag)
-    server_call.server_end_initial_metadata
-    server_call.start_write_status(StatusCodes::NOT_FOUND, 'not found',
-                                   @server_tag)
-
-    # Client sends some data
-    client_sends(call)
-
-    # client gets an empty response for the read, preceeded by some metadata.
-    call.start_read(@tag)
-    expect_next_event_on(@client_queue, CLIENT_METADATA_READ,
-                         @client_metadata_tag)
-    ev = expect_next_event_on(@client_queue, READ, @tag)
-    expect(ev.tag).to be(@tag)
-    expect(ev.result.to_s).to eq('')
-
-    # finally, after client sends writes_done, they get the finished.
-    call.writes_done(@tag)
-    expect_next_event_on(@client_queue, FINISH_ACCEPTED, @tag)
-    ev = expect_next_event_on(@client_queue, FINISHED, @client_finished_tag)
-    expect(ev.result.code).to eq(StatusCodes::NOT_FOUND)
+    client_ops = {
+      CallOps::SEND_INITIAL_METADATA => {},
+      CallOps::SEND_MESSAGE => sent_message
+    }
+    batch_result = call.run_batch(@client_queue, @client_tag, deadline,
+                                  client_ops)
+    expect(batch_result.send_metadata).to be true
+    expect(batch_result.send_message).to be true
+
+    # confirm the server can read the inbound message
+    the_status = Struct::Status.new(StatusCodes::OK, 'OK')
+    server_call = server_allows_client_to_proceed
+    server_ops = {
+      CallOps::SEND_STATUS_FROM_SERVER => the_status
+    }
+    svr_batch = server_call.run_batch(@server_queue, @server_tag, deadline,
+                                      server_ops)
+    expect(svr_batch.message).to eq nil
+    expect(svr_batch.send_status).to be true
   end
 
   it 'completes calls by sending status to client and server' do
     call = new_client_call
-    call.invoke(@client_queue, @client_metadata_tag, @client_finished_tag)
+    client_ops = {
+      CallOps::SEND_INITIAL_METADATA => {},
+      CallOps::SEND_MESSAGE => sent_message
+    }
+    batch_result = call.run_batch(@client_queue, @client_tag, deadline,
+                                  client_ops)
+    expect(batch_result.send_metadata).to be true
+    expect(batch_result.send_message).to be true
+
+    # confirm the server can read the inbound message and respond
+    the_status = Struct::Status.new(StatusCodes::OK, 'OK', {})
     server_call = server_allows_client_to_proceed
-    client_sends(call)
-    server_responds_with(server_call, 'server_response')
-    server_call.start_write_status(10_101, 'status code is 10101', @server_tag)
-
-    # first the client says writes are done
-    call.start_read(@tag)
-    expect_next_event_on(@client_queue, READ, @tag)
-    call.writes_done(@tag)
-
-    # but nothing happens until the server sends a status
-    expect_next_event_on(@server_queue, FINISH_ACCEPTED, @server_tag)
-    ev = expect_next_event_on(@server_queue, FINISHED, @server_finished_tag)
-    expect(ev.result).to be_a(Struct::Status)
-
-    # client gets FINISHED
-    expect_next_event_on(@client_queue, FINISH_ACCEPTED, @tag)
-    ev = expect_next_event_on(@client_queue, FINISHED, @client_finished_tag)
-    expect(ev.result.details).to eq('status code is 10101')
-    expect(ev.result.code).to eq(10_101)
+    server_ops = {
+      CallOps::RECV_MESSAGE => nil,
+      CallOps::SEND_MESSAGE => reply_text,
+      CallOps::SEND_STATUS_FROM_SERVER => the_status
+    }
+    svr_batch = server_call.run_batch(@server_queue, @server_tag, deadline,
+                                      server_ops)
+    expect(svr_batch.message).to eq sent_message
+    expect(svr_batch.send_status).to be true
+    expect(svr_batch.send_message).to be true
+
+    # confirm the client can receive the server response and status.
+    client_ops = {
+      CallOps::SEND_CLOSE_FROM_CLIENT => nil,
+      CallOps::RECV_MESSAGE => nil,
+      CallOps::RECV_STATUS_ON_CLIENT => nil
+    }
+    batch_result = call.run_batch(@client_queue, @client_tag, deadline,
+                                  client_ops)
+    expect(batch_result.send_close).to be true
+    expect(batch_result.message).to eq reply_text
+    expect(batch_result.status).to eq the_status
+
+    # confirm the server can receive the client close.
+    server_ops = {
+      CallOps::RECV_CLOSE_ON_SERVER => nil
+    }
+    svr_batch = server_call.run_batch(@server_queue, @server_tag, deadline,
+                                      server_ops)
+    expect(svr_batch.send_close).to be true
   end
 end
 
@@ -224,25 +208,33 @@ shared_examples 'GRPC metadata delivery works OK' do
     it 'raises an exception if a metadata key is invalid' do
       @bad_keys.each do |md|
         call = new_client_call
-        expect { call.add_metadata(md) }.to raise_error
+        client_ops = {
+          CallOps::SEND_INITIAL_METADATA => md
+        }
+        blk = proc do
+          call.run_batch(@client_queue, @client_tag, deadline,
+                         client_ops)
+        end
+        expect(&blk).to raise_error
       end
     end
 
     it 'sends all the metadata pairs when keys and values are valid' do
       @valid_metadata.each do |md|
         call = new_client_call
-        call.add_metadata(md)
-
-        # Client begins a call OK
-        call.invoke(@client_queue, @client_metadata_tag, @client_finished_tag)
-
-        # ... server has all metadata available even though the client did not
-        # send a write
-        @server.request_call(@server_tag)
-        ev = expect_next_event_on(@server_queue, SERVER_RPC_NEW, @server_tag)
+        client_ops = {
+          CallOps::SEND_INITIAL_METADATA => md
+        }
+        batch_result = call.run_batch(@client_queue, @client_tag, deadline,
+                                      client_ops)
+        expect(batch_result.send_metadata).to be true
+
+        # confirm the server can receive the client metadata
+        recvd_rpc = @server.request_call(@server_queue, @server_tag, deadline)
+        expect(recvd_rpc).to_not eq nil
+        recvd_md = recvd_rpc.metadata
         replace_symbols = Hash[md.each_pair.collect { |x, y| [x.to_s, y] }]
-        result = ev.result.metadata
-        expect(result.merge(replace_symbols)).to eq(result)
+        expect(recvd_md).to eq(recvd_md.merge(replace_symbols))
       end
     end
   end
@@ -266,55 +258,81 @@ shared_examples 'GRPC metadata delivery works OK' do
     it 'raises an exception if a metadata key is invalid' do
       @bad_keys.each do |md|
         call = new_client_call
-        call.invoke(@client_queue, @client_metadata_tag, @client_finished_tag)
+        # client signals that it's done sending metadata to allow server to
+        # respond
+        client_ops = {
+          CallOps::SEND_INITIAL_METADATA => nil
+        }
+        call.run_batch(@client_queue, @client_tag, deadline, client_ops)
 
         # server gets the invocation
-        @server.request_call(@server_tag)
-        ev = expect_next_event_on(@server_queue, SERVER_RPC_NEW, @server_tag)
-        expect { ev.call.add_metadata(md) }.to raise_error
+        recvd_rpc = @server.request_call(@server_queue, @server_tag, deadline)
+        expect(recvd_rpc).to_not eq nil
+        server_ops = {
+          CallOps::SEND_INITIAL_METADATA => md
+        }
+        blk = proc do
+          recvd_rpc.call.run_batch(@server_queue, @server_tag, deadline,
+                                   server_ops)
+        end
+        expect(&blk).to raise_error
       end
     end
 
-    it 'sends a hash that contains the status when no metadata is added' do
+    it 'sends an empty hash if no metadata is added' do
       call = new_client_call
-      call.invoke(@client_queue, @client_metadata_tag, @client_finished_tag)
-
-      # server gets the invocation
-      @server.request_call(@server_tag)
-      ev = expect_next_event_on(@server_queue, SERVER_RPC_NEW, @server_tag)
-      server_call = ev.call
-
-      # ... server accepts the call without adding metadata
-      server_call.server_accept(@server_queue, @server_finished_tag)
-      server_call.server_end_initial_metadata
-
-      # there is the HTTP status metadata, though there should not be any
-      # TODO: update this with the bug number to be resolved
-      ev = expect_next_event_on(@client_queue, CLIENT_METADATA_READ,
-                                @client_metadata_tag)
-      expect(ev.result).to eq({})
+      # client signals that it's done sending metadata to allow server to
+      # respond
+      client_ops = {
+        CallOps::SEND_INITIAL_METADATA => nil
+      }
+      call.run_batch(@client_queue, @client_tag, deadline, client_ops)
+
+      # server gets the invocation but sends no metadata back
+      recvd_rpc = @server.request_call(@server_queue, @server_tag, deadline)
+      expect(recvd_rpc).to_not eq nil
+      server_call = recvd_rpc.call
+      server_ops = {
+        CallOps::SEND_INITIAL_METADATA => nil
+      }
+      server_call.run_batch(@server_queue, @server_tag, deadline, server_ops)
+
+      # client receives nothing as expected
+      client_ops = {
+        CallOps::RECV_INITIAL_METADATA => nil
+      }
+      batch_result = call.run_batch(@client_queue, @client_tag, deadline,
+                                    client_ops)
+      expect(batch_result.metadata).to eq({})
     end
 
     it 'sends all the pairs when keys and values are valid' do
       @valid_metadata.each do |md|
         call = new_client_call
-        call.invoke(@client_queue, @client_metadata_tag, @client_finished_tag)
-
-        # server gets the invocation
-        @server.request_call(@server_tag)
-        ev = expect_next_event_on(@server_queue, SERVER_RPC_NEW, @server_tag)
-        server_call = ev.call
-
-        # ... server adds metadata and accepts the call
-        server_call.add_metadata(md)
-        server_call.server_accept(@server_queue, @server_finished_tag)
-        server_call.server_end_initial_metadata
-
-        # Now the client can read the metadata
-        ev = expect_next_event_on(@client_queue, CLIENT_METADATA_READ,
-                                  @client_metadata_tag)
+        # client signals that it's done sending metadata to allow server to
+        # respond
+        client_ops = {
+          CallOps::SEND_INITIAL_METADATA => nil
+        }
+        call.run_batch(@client_queue, @client_tag, deadline, client_ops)
+
+        # server gets the invocation but sends no metadata back
+        recvd_rpc = @server.request_call(@server_queue, @server_tag, deadline)
+        expect(recvd_rpc).to_not eq nil
+        server_call = recvd_rpc.call
+        server_ops = {
+          CallOps::SEND_INITIAL_METADATA => md
+        }
+        server_call.run_batch(@server_queue, @server_tag, deadline, server_ops)
+
+        # client receives nothing as expected
+        client_ops = {
+          CallOps::RECV_INITIAL_METADATA => nil
+        }
+        batch_result = call.run_batch(@client_queue, @client_tag, deadline,
+                                      client_ops)
         replace_symbols = Hash[md.each_pair.collect { |x, y| [x.to_s, y] }]
-        expect(ev.result).to eq(replace_symbols)
+        expect(batch_result.metadata).to eq(replace_symbols)
       end
     end
   end
diff --git a/src/ruby/spec/event_spec.rb b/src/ruby/spec/event_spec.rb
deleted file mode 100644
index 7d92fcd792870c07c937a6213f780f01d2b89cb2..0000000000000000000000000000000000000000
--- a/src/ruby/spec/event_spec.rb
+++ /dev/null
@@ -1,53 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-require 'grpc'
-
-describe GRPC::Core::CompletionType do
-  before(:each) do
-    @known_types = {
-      QUEUE_SHUTDOWN: 0,
-      OP_COMPLETE: 1,
-      READ: 2,
-      WRITE_ACCEPTED: 3,
-      FINISH_ACCEPTED: 4,
-      CLIENT_METADATA_READ: 5,
-      FINISHED: 6,
-      SERVER_RPC_NEW: 7,
-      SERVER_SHUTDOWN: 8,
-      RESERVED: 9
-    }
-  end
-
-  it 'should have all the known types' do
-    mod = GRPC::Core::CompletionType
-    blk = proc { Hash[mod.constants.collect { |c| [c, mod.const_get(c)] }] }
-    expect(blk.call).to eq(@known_types)
-  end
-end
diff --git a/src/ruby/spec/generic/active_call_spec.rb b/src/ruby/spec/generic/active_call_spec.rb
index 96e07cacb44ae3351a6a502225742e23b8653784..575871afb110aa1de18dad5c34ec6c2fc215c3be 100644
--- a/src/ruby/spec/generic/active_call_spec.rb
+++ b/src/ruby/spec/generic/active_call_spec.rb
@@ -34,12 +34,11 @@ include GRPC::Core::StatusCodes
 describe GRPC::ActiveCall do
   ActiveCall = GRPC::ActiveCall
   Call = GRPC::Core::Call
-  CompletionType = GRPC::Core::CompletionType
+  CallOps = GRPC::Core::CallOps
 
   before(:each) do
     @pass_through = proc { |x| x }
     @server_tag = Object.new
-    @server_done_tag = Object.new
     @tag = Object.new
 
     @client_queue = GRPC::Core::CompletionQueue.new
@@ -48,7 +47,7 @@ describe GRPC::ActiveCall do
     @server = GRPC::Core::Server.new(@server_queue, nil)
     server_port = @server.add_http2_port(host)
     @server.start
-    @ch = GRPC::Core::Channel.new("localhost:#{server_port}", nil)
+    @ch = GRPC::Core::Channel.new("0.0.0.0:#{server_port}", nil)
   end
 
   after(:each) do
@@ -58,12 +57,10 @@ describe GRPC::ActiveCall do
   describe 'restricted view methods' do
     before(:each) do
       call = make_test_call
-      done_tag, meta_tag = ActiveCall.client_invoke(call, @client_queue,
-                                                    deadline)
+      md_tag = ActiveCall.client_invoke(call, @client_queue, deadline)
       @client_call = ActiveCall.new(call, @client_queue, @pass_through,
                                     @pass_through, deadline,
-                                    finished_tag: done_tag,
-                                    read_metadata_tag: meta_tag)
+                                    metadata_tag: md_tag)
     end
 
     describe '#multi_req_view' do
@@ -90,48 +87,45 @@ describe GRPC::ActiveCall do
   describe '#remote_send' do
     it 'allows a client to send a payload to the server' do
       call = make_test_call
-      done_tag, meta_tag = ActiveCall.client_invoke(call, @client_queue,
-                                                    deadline)
+      md_tag = ActiveCall.client_invoke(call, @client_queue, deadline)
       @client_call = ActiveCall.new(call, @client_queue, @pass_through,
                                     @pass_through, deadline,
-                                    finished_tag: done_tag,
-                                    read_metadata_tag: meta_tag)
+                                    metadata_tag: md_tag)
       msg = 'message is a string'
       @client_call.remote_send(msg)
 
       # check that server rpc new was received
-      @server.request_call(@server_tag)
-      ev = @server_queue.next(deadline)
-      expect(ev.type).to be(CompletionType::SERVER_RPC_NEW)
-      expect(ev.call).to be_a(Call)
-      expect(ev.tag).to be(@server_tag)
+      recvd_rpc = @server.request_call(@server_queue, @server_tag, deadline)
+      expect(recvd_rpc).to_not eq nil
+      recvd_call = recvd_rpc.call
 
       # Accept the call, and verify that the server reads the response ok.
-      ev.call.server_accept(@client_queue, @server_tag)
-      ev.call.server_end_initial_metadata
-      server_call = ActiveCall.new(ev.call, @client_queue, @pass_through,
+      server_ops = {
+        CallOps::SEND_INITIAL_METADATA => {}
+      }
+      recvd_call.run_batch(@server_queue, @server_tag, deadline, server_ops)
+      server_call = ActiveCall.new(recvd_call, @server_queue, @pass_through,
                                    @pass_through, deadline)
       expect(server_call.remote_read).to eq(msg)
     end
 
     it 'marshals the payload using the marshal func' do
       call = make_test_call
-      done_tag, meta_tag = ActiveCall.client_invoke(call, @client_queue,
-                                                    deadline)
+      ActiveCall.client_invoke(call, @client_queue, deadline)
       marshal = proc { |x| 'marshalled:' + x }
       client_call = ActiveCall.new(call, @client_queue, marshal,
-                                   @pass_through, deadline,
-                                   finished_tag: done_tag,
-                                   read_metadata_tag: meta_tag)
+                                   @pass_through, deadline)
       msg = 'message is a string'
       client_call.remote_send(msg)
 
       # confirm that the message was marshalled
-      @server.request_call(@server_tag)
-      ev = @server_queue.next(deadline)
-      ev.call.server_accept(@client_queue, @server_tag)
-      ev.call.server_end_initial_metadata
-      server_call = ActiveCall.new(ev.call, @client_queue, @pass_through,
+      recvd_rpc =  @server.request_call(@server_queue, @server_tag, deadline)
+      recvd_call = recvd_rpc.call
+      server_ops = {
+        CallOps::SEND_INITIAL_METADATA => nil
+      }
+      recvd_call.run_batch(@server_queue, @server_tag, deadline, server_ops)
+      server_call = ActiveCall.new(recvd_call, @server_queue, @pass_through,
                                    @pass_through, deadline)
       expect(server_call.remote_read).to eq('marshalled:' + msg)
     end
@@ -142,23 +136,22 @@ describe GRPC::ActiveCall do
       call = make_test_call
       ActiveCall.client_invoke(call, @client_queue, deadline,
                                k1: 'v1', k2: 'v2')
-      @server.request_call(@server_tag)
-      ev = @server_queue.next(deadline)
-      expect(ev).to_not be_nil
-      expect(ev.result.metadata['k1']).to eq('v1')
-      expect(ev.result.metadata['k2']).to eq('v2')
+      recvd_rpc =  @server.request_call(@server_queue, @server_tag, deadline)
+      recvd_call = recvd_rpc.call
+      expect(recvd_call).to_not be_nil
+      expect(recvd_rpc.metadata).to_not be_nil
+      expect(recvd_rpc.metadata['k1']).to eq('v1')
+      expect(recvd_rpc.metadata['k2']).to eq('v2')
     end
   end
 
   describe '#remote_read' do
     it 'reads the response sent by a server' do
       call = make_test_call
-      done_tag, meta_tag = ActiveCall.client_invoke(call, @client_queue,
-                                                    deadline)
+      md_tag = ActiveCall.client_invoke(call, @client_queue, deadline)
       client_call = ActiveCall.new(call, @client_queue, @pass_through,
                                    @pass_through, deadline,
-                                   finished_tag: done_tag,
-                                   read_metadata_tag: meta_tag)
+                                   metadata_tag: md_tag)
       msg = 'message is a string'
       client_call.remote_send(msg)
       server_call = expect_server_to_receive(msg)
@@ -168,12 +161,10 @@ describe GRPC::ActiveCall do
 
     it 'saves no metadata when the server adds no metadata' do
       call = make_test_call
-      done_tag, meta_tag = ActiveCall.client_invoke(call, @client_queue,
-                                                    deadline)
+      md_tag = ActiveCall.client_invoke(call, @client_queue, deadline)
       client_call = ActiveCall.new(call, @client_queue, @pass_through,
                                    @pass_through, deadline,
-                                   finished_tag: done_tag,
-                                   read_metadata_tag: meta_tag)
+                                   metadata_tag: md_tag)
       msg = 'message is a string'
       client_call.remote_send(msg)
       server_call = expect_server_to_receive(msg)
@@ -185,12 +176,10 @@ describe GRPC::ActiveCall do
 
     it 'saves metadata add by the server' do
       call = make_test_call
-      done_tag, meta_tag = ActiveCall.client_invoke(call, @client_queue,
-                                                    deadline)
+      md_tag = ActiveCall.client_invoke(call, @client_queue, deadline)
       client_call = ActiveCall.new(call, @client_queue, @pass_through,
                                    @pass_through, deadline,
-                                   finished_tag: done_tag,
-                                   read_metadata_tag: meta_tag)
+                                   metadata_tag: md_tag)
       msg = 'message is a string'
       client_call.remote_send(msg)
       server_call = expect_server_to_receive(msg, k1: 'v1', k2: 'v2')
@@ -203,12 +192,10 @@ describe GRPC::ActiveCall do
 
     it 'get a nil msg before a status when an OK status is sent' do
       call = make_test_call
-      done_tag, meta_tag = ActiveCall.client_invoke(call, @client_queue,
-                                                    deadline)
+      md_tag = ActiveCall.client_invoke(call, @client_queue, deadline)
       client_call = ActiveCall.new(call, @client_queue, @pass_through,
                                    @pass_through, deadline,
-                                   finished_tag: done_tag,
-                                   read_metadata_tag: meta_tag)
+                                   metadata_tag: md_tag)
       msg = 'message is a string'
       client_call.remote_send(msg)
       client_call.writes_done(false)
@@ -222,13 +209,11 @@ describe GRPC::ActiveCall do
 
     it 'unmarshals the response using the unmarshal func' do
       call = make_test_call
-      done_tag, meta_tag = ActiveCall.client_invoke(call, @client_queue,
-                                                    deadline)
+      md_tag = ActiveCall.client_invoke(call, @client_queue, deadline)
       unmarshal = proc { |x| 'unmarshalled:' + x }
       client_call = ActiveCall.new(call, @client_queue, @pass_through,
                                    unmarshal, deadline,
-                                   finished_tag: done_tag,
-                                   read_metadata_tag: meta_tag)
+                                   metadata_tag: md_tag)
 
       # confirm the client receives the unmarshalled message
       msg = 'message is a string'
@@ -249,13 +234,11 @@ describe GRPC::ActiveCall do
 
     it 'the returns an enumerator that can read n responses' do
       call = make_test_call
-      done_tag, meta_tag = ActiveCall.client_invoke(call, @client_queue,
-                                                    deadline)
+      md_tag = ActiveCall.client_invoke(call, @client_queue, deadline)
       client_call = ActiveCall.new(call, @client_queue, @pass_through,
                                    @pass_through, deadline,
-                                   finished_tag: done_tag,
-                                   read_metadata_tag: meta_tag)
-      msg = 'message is 4a string'
+                                   metadata_tag: md_tag)
+      msg = 'message is a string'
       reply = 'server_response'
       client_call.remote_send(msg)
       server_call = expect_server_to_receive(msg)
@@ -269,12 +252,10 @@ describe GRPC::ActiveCall do
 
     it 'the returns an enumerator that stops after an OK Status' do
       call = make_test_call
-      done_tag, meta_tag = ActiveCall.client_invoke(call, @client_queue,
-                                                    deadline)
+      md_tag = ActiveCall.client_invoke(call, @client_queue, deadline)
       client_call = ActiveCall.new(call, @client_queue, @pass_through,
                                    @pass_through, deadline,
-                                   read_metadata_tag: meta_tag,
-                                   finished_tag: done_tag)
+                                   metadata_tag: md_tag)
       msg = 'message is a string'
       reply = 'server_response'
       client_call.remote_send(msg)
@@ -294,12 +275,10 @@ describe GRPC::ActiveCall do
   describe '#writes_done' do
     it 'finishes ok if the server sends a status response' do
       call = make_test_call
-      done_tag, meta_tag = ActiveCall.client_invoke(call, @client_queue,
-                                                    deadline)
+      md_tag = ActiveCall.client_invoke(call, @client_queue, deadline)
       client_call = ActiveCall.new(call, @client_queue, @pass_through,
                                    @pass_through, deadline,
-                                   finished_tag: done_tag,
-                                   read_metadata_tag: meta_tag)
+                                   metadata_tag: md_tag)
       msg = 'message is a string'
       client_call.remote_send(msg)
       expect { client_call.writes_done(false) }.to_not raise_error
@@ -312,12 +291,10 @@ describe GRPC::ActiveCall do
 
     it 'finishes ok if the server sends an early status response' do
       call = make_test_call
-      done_tag, meta_tag = ActiveCall.client_invoke(call, @client_queue,
-                                                    deadline)
+      md_tag = ActiveCall.client_invoke(call, @client_queue, deadline)
       client_call = ActiveCall.new(call, @client_queue, @pass_through,
                                    @pass_through, deadline,
-                                   read_metadata_tag: meta_tag,
-                                   finished_tag: done_tag)
+                                   metadata_tag: md_tag)
       msg = 'message is a string'
       client_call.remote_send(msg)
       server_call = expect_server_to_receive(msg)
@@ -330,12 +307,10 @@ describe GRPC::ActiveCall do
 
     it 'finishes ok if writes_done is true' do
       call = make_test_call
-      done_tag, meta_tag = ActiveCall.client_invoke(call, @client_queue,
-                                                    deadline)
+      md_tag = ActiveCall.client_invoke(call, @client_queue, deadline)
       client_call = ActiveCall.new(call, @client_queue, @pass_through,
                                    @pass_through, deadline,
-                                   read_metadata_tag: meta_tag,
-                                   finished_tag: done_tag)
+                                   metadata_tag: md_tag)
       msg = 'message is a string'
       client_call.remote_send(msg)
       server_call = expect_server_to_receive(msg)
@@ -353,21 +328,20 @@ describe GRPC::ActiveCall do
   end
 
   def expect_server_to_be_invoked(**kw)
-    @server.request_call(@server_tag)
-    ev = @server_queue.next(deadline)
-    ev.call.add_metadata(kw)
-    ev.call.server_accept(@client_queue, @server_done_tag)
-    ev.call.server_end_initial_metadata
-    ActiveCall.new(ev.call, @client_queue, @pass_through,
-                   @pass_through, deadline,
-                   finished_tag: @server_done_tag)
+    recvd_rpc =  @server.request_call(@server_queue, @server_tag, deadline)
+    expect(recvd_rpc).to_not eq nil
+    recvd_call = recvd_rpc.call
+    recvd_call.run_batch(@server_queue, @server_tag, deadline,
+                         CallOps::SEND_INITIAL_METADATA => kw)
+    ActiveCall.new(recvd_call, @server_queue, @pass_through,
+                   @pass_through, deadline)
   end
 
   def make_test_call
-    @ch.create_call('dummy_method', 'dummy_host', deadline)
+    @ch.create_call(@client_queue, '/method', 'a.dummy.host', deadline)
   end
 
   def deadline
-    Time.now + 1  # in 1 second; arbitrary
+    Time.now + 2  # in 2 seconds; arbitrary
   end
 end
diff --git a/src/ruby/spec/generic/client_stub_spec.rb b/src/ruby/spec/generic/client_stub_spec.rb
index 0c98fc40d91a5949d2142c232d75e0151b4273c7..193c5f2a0387b23c2eca5a7ddf64620de3b5d1f8 100644
--- a/src/ruby/spec/generic/client_stub_spec.rb
+++ b/src/ruby/spec/generic/client_stub_spec.rb
@@ -30,15 +30,41 @@
 require 'grpc'
 require 'xray/thread_dump_signal_handler'
 
-NOOP = proc { |x| x }
-FAKE_HOST = 'localhost:0'
+# Notifier is useful high-level synchronization primitive.
+class Notifier
+  attr_reader :payload, :notified
+  alias_method :notified?, :notified
+
+  def initialize
+    @mutex    = Mutex.new
+    @cvar     = ConditionVariable.new
+    @notified = false
+    @payload  = nil
+  end
+
+  def wait
+    @mutex.synchronize do
+      @cvar.wait(@mutex) until notified?
+    end
+  end
+
+  def notify(payload)
+    @mutex.synchronize do
+      return Error.new('already notified') if notified?
+      @payload  = payload
+      @notified = true
+      @cvar.signal
+      return nil
+    end
+  end
+end
 
 def wakey_thread(&blk)
-  awake_mutex, awake_cond = Mutex.new, ConditionVariable.new
+  n = Notifier.new
   t = Thread.new do
-    blk.call(awake_mutex, awake_cond)
+    blk.call(n)
   end
-  awake_mutex.synchronize { awake_cond.wait(awake_mutex) }
+  n.wait
   t
 end
 
@@ -50,8 +76,11 @@ end
 
 include GRPC::Core::StatusCodes
 include GRPC::Core::TimeConsts
+include GRPC::Core::CallOps
 
 describe 'ClientStub' do
+  let(:noop) { proc { |x| x } }
+
   before(:each) do
     Thread.abort_on_exception = true
     @server = nil
@@ -66,61 +95,56 @@ describe 'ClientStub' do
   end
 
   describe '#new' do
+    let(:fake_host) { 'localhost:0' }
     it 'can be created from a host and args' do
-      host = FAKE_HOST
       opts = { a_channel_arg: 'an_arg' }
       blk = proc do
-        GRPC::ClientStub.new(host, @cq, **opts)
+        GRPC::ClientStub.new(fake_host, @cq, **opts)
       end
       expect(&blk).not_to raise_error
     end
 
     it 'can be created with a default deadline' do
-      host = FAKE_HOST
       opts = { a_channel_arg: 'an_arg', deadline: 5 }
       blk = proc do
-        GRPC::ClientStub.new(host, @cq, **opts)
+        GRPC::ClientStub.new(fake_host, @cq, **opts)
       end
       expect(&blk).not_to raise_error
     end
 
     it 'can be created with an channel override' do
-      host = FAKE_HOST
       opts = { a_channel_arg: 'an_arg', channel_override: @ch }
       blk = proc do
-        GRPC::ClientStub.new(host, @cq, **opts)
+        GRPC::ClientStub.new(fake_host, @cq, **opts)
       end
       expect(&blk).not_to raise_error
     end
 
     it 'cannot be created with a bad channel override' do
-      host = FAKE_HOST
       blk = proc do
         opts = { a_channel_arg: 'an_arg', channel_override: Object.new }
-        GRPC::ClientStub.new(host, @cq, **opts)
+        GRPC::ClientStub.new(fake_host, @cq, **opts)
       end
       expect(&blk).to raise_error
     end
 
     it 'cannot be created with bad credentials' do
-      host = FAKE_HOST
       blk = proc do
         opts = { a_channel_arg: 'an_arg', creds: Object.new }
-        GRPC::ClientStub.new(host, @cq, **opts)
+        GRPC::ClientStub.new(fake_host, @cq, **opts)
       end
       expect(&blk).to raise_error
     end
 
     it 'can be created with test test credentials' do
       certs = load_test_certs
-      host = FAKE_HOST
       blk = proc do
         opts = {
           GRPC::Core::Channel::SSL_TARGET => 'foo.test.google.fr',
           a_channel_arg: 'an_arg',
           creds: GRPC::Core::Credentials.new(certs[0], nil, nil)
         }
-        GRPC::ClientStub.new(host, @cq, **opts)
+        GRPC::ClientStub.new(fake_host, @cq, **opts)
       end
       expect(&blk).to_not raise_error
     end
@@ -187,7 +211,7 @@ describe 'ClientStub' do
 
     describe 'without a call operation' do
       def get_response(stub)
-        stub.request_response(@method, @sent_msg, NOOP, NOOP,
+        stub.request_response(@method, @sent_msg, noop, noop,
                               k1: 'v1', k2: 'v2')
       end
 
@@ -196,7 +220,7 @@ describe 'ClientStub' do
 
     describe 'via a call operation' do
       def get_response(stub)
-        op = stub.request_response(@method, @sent_msg, NOOP, NOOP,
+        op = stub.request_response(@method, @sent_msg, noop, noop,
                                    return_op: true, k1: 'v1', k2: 'v2')
         expect(op).to be_a(GRPC::ActiveCall::Operation)
         op.execute
@@ -259,7 +283,7 @@ describe 'ClientStub' do
 
     describe 'without a call operation' do
       def get_response(stub)
-        stub.client_streamer(@method, @sent_msgs, NOOP, NOOP,
+        stub.client_streamer(@method, @sent_msgs, noop, noop,
                              k1: 'v1', k2: 'v2')
       end
 
@@ -268,7 +292,7 @@ describe 'ClientStub' do
 
     describe 'via a call operation' do
       def get_response(stub)
-        op = stub.client_streamer(@method, @sent_msgs, NOOP, NOOP,
+        op = stub.client_streamer(@method, @sent_msgs, noop, noop,
                                   return_op: true, k1: 'v1', k2: 'v2')
         expect(op).to be_a(GRPC::ActiveCall::Operation)
         op.execute
@@ -333,7 +357,7 @@ describe 'ClientStub' do
 
     describe 'without a call operation' do
       def get_responses(stub)
-        e = stub.server_streamer(@method, @sent_msg, NOOP, NOOP,
+        e = stub.server_streamer(@method, @sent_msg, noop, noop,
                                  k1: 'v1', k2: 'v2')
         expect(e).to be_a(Enumerator)
         e
@@ -344,7 +368,7 @@ describe 'ClientStub' do
 
     describe 'via a call operation' do
       def get_responses(stub)
-        op = stub.server_streamer(@method, @sent_msg, NOOP, NOOP,
+        op = stub.server_streamer(@method, @sent_msg, noop, noop,
                                   return_op: true, k1: 'v1', k2: 'v2')
         expect(op).to be_a(GRPC::ActiveCall::Operation)
         e = op.execute
@@ -361,34 +385,30 @@ describe 'ClientStub' do
       before(:each) do
         @sent_msgs = Array.new(3) { |i| 'msg_' + (i + 1).to_s }
         @replys = Array.new(3) { |i| 'reply_' + (i + 1).to_s }
+        server_port = create_test_server
+        @host = "localhost:#{server_port}"
       end
 
       it 'supports sending all the requests first', bidi: true do
-        server_port = create_test_server
-        host = "localhost:#{server_port}"
         th = run_bidi_streamer_handle_inputs_first(@sent_msgs, @replys,
                                                    @pass)
-        stub = GRPC::ClientStub.new(host, @cq)
+        stub = GRPC::ClientStub.new(@host, @cq)
         e = get_responses(stub)
         expect(e.collect { |r| r }).to eq(@replys)
         th.join
       end
 
       it 'supports client-initiated ping pong', bidi: true do
-        server_port = create_test_server
-        host = "localhost:#{server_port}"
         th = run_bidi_streamer_echo_ping_pong(@sent_msgs, @pass, true)
-        stub = GRPC::ClientStub.new(host, @cq)
+        stub = GRPC::ClientStub.new(@host, @cq)
         e = get_responses(stub)
         expect(e.collect { |r| r }).to eq(@sent_msgs)
         th.join
       end
 
       it 'supports a server-initiated ping pong', bidi: true do
-        server_port = create_test_server
-        host = "localhost:#{server_port}"
         th = run_bidi_streamer_echo_ping_pong(@sent_msgs, @pass, false)
-        stub = GRPC::ClientStub.new(host, @cq)
+        stub = GRPC::ClientStub.new(@host, @cq)
         e = get_responses(stub)
         expect(e.collect { |r| r }).to eq(@sent_msgs)
         th.join
@@ -397,7 +417,7 @@ describe 'ClientStub' do
 
     describe 'without a call operation' do
       def get_responses(stub)
-        e = stub.bidi_streamer(@method, @sent_msgs, NOOP, NOOP)
+        e = stub.bidi_streamer(@method, @sent_msgs, noop, noop)
         expect(e).to be_a(Enumerator)
         e
       end
@@ -407,7 +427,7 @@ describe 'ClientStub' do
 
     describe 'via a call operation' do
       def get_responses(stub)
-        op = stub.bidi_streamer(@method, @sent_msgs, NOOP, NOOP,
+        op = stub.bidi_streamer(@method, @sent_msgs, noop, noop,
                                 return_op: true)
         expect(op).to be_a(GRPC::ActiveCall::Operation)
         e = op.execute
@@ -421,8 +441,8 @@ describe 'ClientStub' do
 
   def run_server_streamer(expected_input, replys, status, **kw)
     wanted_metadata = kw.clone
-    wakey_thread do |mtx, cnd|
-      c = expect_server_to_be_invoked(mtx, cnd)
+    wakey_thread do |notifier|
+      c = expect_server_to_be_invoked(notifier)
       wanted_metadata.each do |k, v|
         expect(c.metadata[k.to_s]).to eq(v)
       end
@@ -434,8 +454,8 @@ describe 'ClientStub' do
 
   def run_bidi_streamer_handle_inputs_first(expected_inputs, replys,
                                             status)
-    wakey_thread do |mtx, cnd|
-      c = expect_server_to_be_invoked(mtx, cnd)
+    wakey_thread do |notifier|
+      c = expect_server_to_be_invoked(notifier)
       expected_inputs.each { |i| expect(c.remote_read).to eq(i) }
       replys.each { |r| c.remote_send(r) }
       c.send_status(status, status == @pass ? 'OK' : 'NOK', true)
@@ -443,8 +463,8 @@ describe 'ClientStub' do
   end
 
   def run_bidi_streamer_echo_ping_pong(expected_inputs, status, client_starts)
-    wakey_thread do |mtx, cnd|
-      c = expect_server_to_be_invoked(mtx, cnd)
+    wakey_thread do |notifier|
+      c = expect_server_to_be_invoked(notifier)
       expected_inputs.each do |i|
         if client_starts
           expect(c.remote_read).to eq(i)
@@ -460,8 +480,8 @@ describe 'ClientStub' do
 
   def run_client_streamer(expected_inputs, resp, status, **kw)
     wanted_metadata = kw.clone
-    wakey_thread do |mtx, cnd|
-      c = expect_server_to_be_invoked(mtx, cnd)
+    wakey_thread do |notifier|
+      c = expect_server_to_be_invoked(notifier)
       expected_inputs.each { |i| expect(c.remote_read).to eq(i) }
       wanted_metadata.each do |k, v|
         expect(c.metadata[k.to_s]).to eq(v)
@@ -473,8 +493,8 @@ describe 'ClientStub' do
 
   def run_request_response(expected_input, resp, status, **kw)
     wanted_metadata = kw.clone
-    wakey_thread do |mtx, cnd|
-      c = expect_server_to_be_invoked(mtx, cnd)
+    wakey_thread do |notifier|
+      c = expect_server_to_be_invoked(notifier)
       expect(c.remote_read).to eq(expected_input)
       wanted_metadata.each do |k, v|
         expect(c.metadata[k.to_s]).to eq(v)
@@ -490,24 +510,16 @@ describe 'ClientStub' do
     @server.add_http2_port('0.0.0.0:0')
   end
 
-  def start_test_server(awake_mutex, awake_cond)
+  def expect_server_to_be_invoked(notifier)
     @server.start
-    @server_tag = Object.new
-    @server.request_call(@server_tag)
-    awake_mutex.synchronize { awake_cond.signal }
-  end
-
-  def expect_server_to_be_invoked(awake_mutex, awake_cond)
-    start_test_server(awake_mutex, awake_cond)
-    ev = @server_queue.pluck(@server_tag, INFINITE_FUTURE)
-    fail OutOfTime if ev.nil?
-    server_call = ev.call
-    server_call.metadata = ev.result.metadata
-    finished_tag = Object.new
-    server_call.server_accept(@server_queue, finished_tag)
-    server_call.server_end_initial_metadata
-    GRPC::ActiveCall.new(server_call, @server_queue, NOOP, NOOP,
-                         INFINITE_FUTURE,
-                         finished_tag: finished_tag)
+    notifier.notify(nil)
+    server_tag = Object.new
+    recvd_rpc = @server.request_call(@server_queue, server_tag,
+                                     INFINITE_FUTURE)
+    recvd_call = recvd_rpc.call
+    recvd_call.metadata = recvd_rpc.metadata
+    recvd_call.run_batch(@server_queue, server_tag, Time.now + 2,
+                         SEND_INITIAL_METADATA => nil)
+    GRPC::ActiveCall.new(recvd_call, @server_queue, noop, noop, INFINITE_FUTURE)
   end
 end
diff --git a/src/ruby/spec/generic/rpc_desc_spec.rb b/src/ruby/spec/generic/rpc_desc_spec.rb
index 39d1e83748bf4d2812278851ed2b1fbd3fef7a56..a68299465ce35e46433c6cb2cd75d552c61a41c7 100644
--- a/src/ruby/spec/generic/rpc_desc_spec.rb
+++ b/src/ruby/spec/generic/rpc_desc_spec.rb
@@ -37,7 +37,6 @@ describe GRPC::RpcDesc do
   INTERNAL = GRPC::Core::StatusCodes::INTERNAL
   UNKNOWN = GRPC::Core::StatusCodes::UNKNOWN
   CallError = GRPC::Core::CallError
-  EventError = GRPC::Core::EventError
 
   before(:each) do
     @request_response = RpcDesc.new('rr', Object.new, Object.new, 'encode',
@@ -63,24 +62,17 @@ describe GRPC::RpcDesc do
 
       it 'sends the specified status if BadStatus is raised' do
         expect(@call).to receive(:remote_read).once.and_return(Object.new)
-        expect(@call).to receive(:send_status).once.with(@bs_code, 'NOK')
+        expect(@call).to receive(:send_status).once.with(@bs_code, 'NOK', false)
         @request_response.run_server_method(@call, method(:bad_status))
       end
 
       it 'sends status UNKNOWN if other StandardErrors are raised' do
         expect(@call).to receive(:remote_read).once.and_return(Object.new)
-        expect(@call).to receive(:send_status) .once.with(UNKNOWN, @no_reason)
+        expect(@call).to receive(:send_status) .once.with(UNKNOWN, @no_reason,
+                                                          false)
         @request_response.run_server_method(@call, method(:other_error))
       end
 
-      it 'absorbs EventError  with no further action' do
-        expect(@call).to receive(:remote_read).once.and_raise(EventError)
-        blk = proc do
-          @request_response.run_server_method(@call, method(:fake_reqresp))
-        end
-        expect(&blk).to_not raise_error
-      end
-
       it 'absorbs CallError with no further action' do
         expect(@call).to receive(:remote_read).once.and_raise(CallError)
         blk = proc do
@@ -93,8 +85,7 @@ describe GRPC::RpcDesc do
         req = Object.new
         expect(@call).to receive(:remote_read).once.and_return(req)
         expect(@call).to receive(:remote_send).once.with(@ok_response)
-        expect(@call).to receive(:send_status).once.with(OK, 'OK')
-        expect(@call).to receive(:finished).once
+        expect(@call).to receive(:send_status).once.with(OK, 'OK', true)
         @request_response.run_server_method(@call, method(:fake_reqresp))
       end
     end
@@ -107,23 +98,16 @@ describe GRPC::RpcDesc do
       end
 
       it 'sends the specified status if BadStatus is raised' do
-        expect(@call).to receive(:send_status).once.with(@bs_code, 'NOK')
+        expect(@call).to receive(:send_status).once.with(@bs_code, 'NOK', false)
         @client_streamer.run_server_method(@call, method(:bad_status_alt))
       end
 
       it 'sends status UNKNOWN if other StandardErrors are raised' do
-        expect(@call).to receive(:send_status) .once.with(UNKNOWN, @no_reason)
+        expect(@call).to receive(:send_status) .once.with(UNKNOWN, @no_reason,
+                                                          false)
         @client_streamer.run_server_method(@call, method(:other_error_alt))
       end
 
-      it 'absorbs EventError  with no further action' do
-        expect(@call).to receive(:remote_send).once.and_raise(EventError)
-        blk = proc do
-          @client_streamer.run_server_method(@call, method(:fake_clstream))
-        end
-        expect(&blk).to_not raise_error
-      end
-
       it 'absorbs CallError with no further action' do
         expect(@call).to receive(:remote_send).once.and_raise(CallError)
         blk = proc do
@@ -134,8 +118,7 @@ describe GRPC::RpcDesc do
 
       it 'sends a response and closes the stream if there no errors' do
         expect(@call).to receive(:remote_send).once.with(@ok_response)
-        expect(@call).to receive(:send_status).once.with(OK, 'OK')
-        expect(@call).to receive(:finished).once
+        expect(@call).to receive(:send_status).once.with(OK, 'OK', true)
         @client_streamer.run_server_method(@call, method(:fake_clstream))
       end
     end
@@ -149,24 +132,17 @@ describe GRPC::RpcDesc do
 
       it 'sends the specified status if BadStatus is raised' do
         expect(@call).to receive(:remote_read).once.and_return(Object.new)
-        expect(@call).to receive(:send_status).once.with(@bs_code, 'NOK')
+        expect(@call).to receive(:send_status).once.with(@bs_code, 'NOK', false)
         @server_streamer.run_server_method(@call, method(:bad_status))
       end
 
       it 'sends status UNKNOWN if other StandardErrors are raised' do
         expect(@call).to receive(:remote_read).once.and_return(Object.new)
-        expect(@call).to receive(:send_status) .once.with(UNKNOWN, @no_reason)
+        expect(@call).to receive(:send_status) .once.with(UNKNOWN, @no_reason,
+                                                          false)
         @server_streamer.run_server_method(@call, method(:other_error))
       end
 
-      it 'absorbs EventError  with no further action' do
-        expect(@call).to receive(:remote_read).once.and_raise(EventError)
-        blk = proc do
-          @server_streamer.run_server_method(@call, method(:fake_svstream))
-        end
-        expect(&blk).to_not raise_error
-      end
-
       it 'absorbs CallError with no further action' do
         expect(@call).to receive(:remote_read).once.and_raise(CallError)
         blk = proc do
@@ -179,8 +155,7 @@ describe GRPC::RpcDesc do
         req = Object.new
         expect(@call).to receive(:remote_read).once.and_return(req)
         expect(@call).to receive(:remote_send).twice.with(@ok_response)
-        expect(@call).to receive(:send_status).once.with(OK, 'OK')
-        expect(@call).to receive(:finished).once
+        expect(@call).to receive(:send_status).once.with(OK, 'OK', true)
         @server_streamer.run_server_method(@call, method(:fake_svstream))
       end
     end
@@ -197,20 +172,20 @@ describe GRPC::RpcDesc do
       it 'sends the specified status if BadStatus is raised' do
         e = GRPC::BadStatus.new(@bs_code, 'NOK')
         expect(@call).to receive(:run_server_bidi).and_raise(e)
-        expect(@call).to receive(:send_status).once.with(@bs_code, 'NOK')
+        expect(@call).to receive(:send_status).once.with(@bs_code, 'NOK', false)
         @bidi_streamer.run_server_method(@call, method(:bad_status_alt))
       end
 
       it 'sends status UNKNOWN if other StandardErrors are raised' do
         expect(@call).to receive(:run_server_bidi).and_raise(StandardError)
-        expect(@call).to receive(:send_status).once.with(UNKNOWN, @no_reason)
+        expect(@call).to receive(:send_status).once.with(UNKNOWN, @no_reason,
+                                                         false)
         @bidi_streamer.run_server_method(@call, method(:other_error_alt))
       end
 
       it 'closes the stream if there no errors' do
         expect(@call).to receive(:run_server_bidi)
-        expect(@call).to receive(:send_status).once.with(OK, 'OK')
-        expect(@call).to receive(:finished).once
+        expect(@call).to receive(:send_status).once.with(OK, 'OK', true)
         @bidi_streamer.run_server_method(@call, method(:fake_bidistream))
       end
     end
diff --git a/src/ruby/spec/generic/rpc_server_spec.rb b/src/ruby/spec/generic/rpc_server_spec.rb
index 34e5cdcd04cd9389e02ed845c9a3dc5d27dae8b9..f409d73e2fed3ddb19f12b9b6bd2756019294739 100644
--- a/src/ruby/spec/generic/rpc_server_spec.rb
+++ b/src/ruby/spec/generic/rpc_server_spec.rb
@@ -364,7 +364,7 @@ describe GRPC::RpcServer do
         @srv.wait_till_running
         req = EchoMsg.new
         stub = SlowStub.new(@host, **@client_opts)
-        deadline = service.delay + 0.5 # wait for long enough
+        deadline = service.delay + 1.0 # wait for long enough
         expect(stub.an_rpc(req, deadline, k1: 'v1', k2: 'v2')).to be_a(EchoMsg)
         wanted_md = [{ 'k1' => 'v1', 'k2' => 'v2' }]
         expect(service.received_md).to eq(wanted_md)
diff --git a/src/ruby/spec/metadata_spec.rb b/src/ruby/spec/metadata_spec.rb
deleted file mode 100644
index 247286669210b5f1c56b172574e04f5aa658bd76..0000000000000000000000000000000000000000
--- a/src/ruby/spec/metadata_spec.rb
+++ /dev/null
@@ -1,64 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-require 'grpc'
-
-describe GRPC::Core::Metadata do
-  describe '#new' do
-    it 'should create instances' do
-      expect { GRPC::Core::Metadata.new('a key', 'a value') }.to_not raise_error
-    end
-  end
-
-  describe '#key' do
-    md = GRPC::Core::Metadata.new('a key', 'a value')
-    it 'should be the constructor value' do
-      expect(md.key).to eq('a key')
-    end
-  end
-
-  describe '#value' do
-    md = GRPC::Core::Metadata.new('a key', 'a value')
-    it 'should be the constuctor value' do
-      expect(md.value).to eq('a value')
-    end
-  end
-
-  describe '#dup' do
-    it 'should create a copy that returns the correct key' do
-      md = GRPC::Core::Metadata.new('a key', 'a value')
-      expect(md.dup.key).to eq('a key')
-    end
-
-    it 'should create a copy that returns the correct value' do
-      md = GRPC::Core::Metadata.new('a key', 'a value')
-      expect(md.dup.value).to eq('a value')
-    end
-  end
-end
diff --git a/templates/BUILD.template b/templates/BUILD.template
index 997c55b1c89f83148572d4788bab10d8606a9fca..8303b9f8e9631a40ebe12da611c24f003cf56f4c 100644
--- a/templates/BUILD.template
+++ b/templates/BUILD.template
@@ -32,38 +32,79 @@
 
 licenses(["notice"])  # 3-clause BSD
 
+package(default_visibility = ["//visibility:public"])
+
+<%!
+def get_deps(target_dict):
+  deps = []
+  if target_dict.get('secure', 'no') == 'yes':
+    deps = [
+      "//external:libssl",
+    ]
+  if target_dict.get('build', None) == 'protoc':
+    deps.append("//external:protobuf_compiler")
+  if target_dict['name'] == 'grpc++_unsecure' or target_dict['name'] == 'grpc++':
+    deps.append("//external:protobuf_clib")
+  for d in target_dict.get('deps', []):
+    if d.find('//') == 0 or d[0] == ':':
+      deps.append(d)
+    else:
+      deps.append(':%s' % (d))
+  return deps
+%>
+
 % for lib in libs:
-% if lib.build == "all" and lib.language == 'c':
-${makelib(lib)}
+% if lib.build != "private":
+${cc_library(lib)}
 % endif
 % endfor
 
-<%def name="makelib(lib)">
+% for tgt in targets:
+% if tgt.build == 'protoc':
+${cc_binary(tgt)}
+% endif
+% endfor
 
+<%def name="cc_library(lib)">
 cc_library(
-    name = "${lib.name}",
-    srcs = [
+  name = "${lib.name}",
+  srcs = [
 % for hdr in lib.get("headers", []):
-        "${hdr}",
+    "${hdr}",
 % endfor
 % for src in lib.src:
-        "${src}",
+    "${src}",
 % endfor
-    ],
-    hdrs = [
+  ],
+  hdrs = [
 % for hdr in lib.get("public_headers", []):
-        "${hdr}",
+    "${hdr}",
 % endfor
-    ],
-    includes = [
-        "include",
-        ".",
-    ],
-    deps = [
-% for dep in lib.get("deps", []):
-        ":${dep}",
+  ],
+  includes = [
+    "include",
+    ".",
+  ],
+  deps = [
+% for dep in get_deps(lib):
+    "${dep}",
 % endfor
-    ],
+  ],
 )
+</%def>
 
+<%def name="cc_binary(tgt)">
+cc_binary(
+  name = "${tgt.name}",
+  srcs = [
+% for src in tgt.src:
+    "${src}",
+% endfor
+  ],
+  deps = [
+% for dep in get_deps(tgt):
+    "${dep}",
+% endfor
+  ],
+)
 </%def>
diff --git a/templates/Makefile.template b/templates/Makefile.template
index 340cf235992f4e825fe9532f3c14dc6674d014b7..2cfbfa36ec96f9964abf88f4380e0d38188350c4 100644
--- a/templates/Makefile.template
+++ b/templates/Makefile.template
@@ -35,17 +35,11 @@
 
   proto_re = re.compile('(.*)\\.proto')
 
-  def excluded(filename, exclude_res):
-    for r in exclude_res:
-      if r.match(filename):
-        return True
-    return False
-
   def proto_to_cc(filename):
     m = proto_re.match(filename)
     if not m:
       return filename
-    return '$(GENDIR)/' + m.group(1) + '.pb.cc'
+    return '$(GENDIR)/' + m.group(1) + '.pb.cc $(GENDIR)/' + m.group(1) + '.grpc.pb.cc'
 %>
 
 
@@ -244,7 +238,6 @@ ifeq ($(HAS_CXX11),true)
 CXXFLAGS += -std=c++11
 else
 CXXFLAGS += -std=c++0x
-DEFINES += GRPC_OLD_CXX
 endif
 CPPFLAGS += -g -Wall -Wextra -Werror -Wno-long-long -Wno-unused-parameter
 LDFLAGS += -g
@@ -841,11 +834,17 @@ endif
 % for p in protos:
 ifeq ($(NO_PROTOC),true)
 $(GENDIR)/${p}.pb.cc: protoc_dep_error
+$(GENDIR)/${p}.grpc.pb.cc: protoc_dep_error
 else
 $(GENDIR)/${p}.pb.cc: ${p}.proto $(PROTOBUF_DEP) $(PROTOC_PLUGINS)
 	$(E) "[PROTOC]  Generating protobuf CC file from $<"
 	$(Q) mkdir -p `dirname $@`
-	$(Q) $(PROTOC) --cpp_out=$(GENDIR) --grpc_out=$(GENDIR) --plugin=protoc-gen-grpc=$(BINDIR)/$(CONFIG)/grpc_cpp_plugin $<
+	$(Q) $(PROTOC) --cpp_out=$(GENDIR) $<
+
+$(GENDIR)/${p}.grpc.pb.cc: ${p}.proto $(PROTOBUF_DEP) $(PROTOC_PLUGINS)
+	$(E) "[GRPC]    Generating gRPC's protobuf service CC file from $<"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(PROTOC) --grpc_out=$(GENDIR) --plugin=protoc-gen-grpc=$(BINDIR)/$(CONFIG)/grpc_cpp_plugin $<
 endif
 
 % endfor
@@ -927,10 +926,11 @@ ifeq ($(SYSTEM),MINGW32)
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/${lib.name}.$(SHARED_EXT) $(prefix)/lib/${lib.name}.$(SHARED_EXT)
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/lib${lib.name}-imp.a $(prefix)/lib/lib${lib.name}-imp.a
 else
-ifneq ($(SYSTEM),Darwin)
 	$(E) "[INSTALL] Installing lib${lib.name}.$(SHARED_EXT)"
 	$(Q) $(INSTALL) -d $(prefix)/lib
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/lib${lib.name}.$(SHARED_EXT) $(prefix)/lib/lib${lib.name}.$(SHARED_EXT)
+ifneq ($(SYSTEM),Darwin)
+	$(Q) ln -sf lib${lib.name}.$(SHARED_EXT) $(prefix)/lib/lib${lib.name}.so.${settings.version.major}
 	$(Q) ln -sf lib${lib.name}.$(SHARED_EXT) $(prefix)/lib/lib${lib.name}.so
 endif
 endif
@@ -1167,7 +1167,7 @@ ${out_libbase}.$(SHARED_EXT): $(LIB${lib.name.upper()}_OBJS) ${lib_deps}
 	$(E) "[LD]      Linking $@"
 	$(Q) mkdir -p `dirname $@`
 ifeq ($(SYSTEM),Darwin)
-	$(Q) ${ld} $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -dynamiclib -o ${out_libbase}.$(SHARED_EXT) ${common}${libs}
+	$(Q) ${ld} $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -install_name lib${lib.name}.$(SHARED_EXT) -dynamiclib -o ${out_libbase}.$(SHARED_EXT) ${common}${libs}
 else
 	$(Q) ${ld} $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,-soname,lib${lib.name}.so.${settings.version.major} -o ${out_libbase}.$(SHARED_EXT) ${common}${libs}
 	$(Q) ln -sf lib${lib.name}.$(SHARED_EXT) ${out_libbase}.so.${settings.version.major}
diff --git a/test/core/end2end/tests/cancel_after_invoke.c b/test/core/end2end/tests/cancel_after_invoke.c
index 326321f4e211a330af35bb74e8ac2ed0b24ef2e1..592dfd415f9844469858ed344d88fbfa62590aa8 100644
--- a/test/core/end2end/tests/cancel_after_invoke.c
+++ b/test/core/end2end/tests/cancel_after_invoke.c
@@ -110,7 +110,8 @@ static void test_cancel_after_invoke(grpc_end2end_test_config config,
   grpc_op ops[6];
   grpc_op *op;
   grpc_call *c;
-  grpc_end2end_test_fixture f = begin_test(config, __FUNCTION__, mode, NULL, NULL);
+  grpc_end2end_test_fixture f =
+      begin_test(config, __FUNCTION__, mode, NULL, NULL);
   gpr_timespec deadline = five_seconds_time();
   cq_verifier *v_client = cq_verifier_create(f.client_cq);
   grpc_metadata_array initial_metadata_recv;
diff --git a/test/core/end2end/tests/cancel_test_helpers.h b/test/core/end2end/tests/cancel_test_helpers.h
index 3d92b64ae493ac6d807bec41583d667a14d8dc67..0d680fcfe1191cd91cf87f41a425e5c1700a58f6 100644
--- a/test/core/end2end/tests/cancel_test_helpers.h
+++ b/test/core/end2end/tests/cancel_test_helpers.h
@@ -47,6 +47,8 @@ static grpc_call_error wait_for_deadline(grpc_call *call) {
 
 static const cancellation_mode cancellation_modes[] = {
     {"cancel", grpc_call_cancel, GRPC_STATUS_CANCELLED, ""},
-    {"deadline", wait_for_deadline, GRPC_STATUS_DEADLINE_EXCEEDED, "Deadline Exceeded"}, };
+    {"deadline", wait_for_deadline, GRPC_STATUS_DEADLINE_EXCEEDED,
+     "Deadline Exceeded"},
+};
 
-#endif  /* GRPC_TEST_CORE_END2END_TESTS_CANCEL_TEST_HELPERS_H */
+#endif /* GRPC_TEST_CORE_END2END_TESTS_CANCEL_TEST_HELPERS_H */
diff --git a/test/core/iomgr/tcp_server_posix_test.c b/test/core/iomgr/tcp_server_posix_test.c
index 6b80ee1ee8cc8294798e24a9df5ec65a3e046c24..1c02c4b2f8078a350938613c4cccd185f136877a 100644
--- a/test/core/iomgr/tcp_server_posix_test.c
+++ b/test/core/iomgr/tcp_server_posix_test.c
@@ -38,6 +38,7 @@
 #include <grpc/support/time.h>
 #include "test/core/util/test_config.h"
 
+#include <sys/socket.h>
 #include <netinet/in.h>
 #include <string.h>
 #include <unistd.h>
diff --git a/test/core/support/thd_test.c b/test/core/support/thd_test.c
index c03a905d2af2540dc0593c85a98bbe39f71e9ff8..bb3d54a262766795d220ae971485350c740e650e 100644
--- a/test/core/support/thd_test.c
+++ b/test/core/support/thd_test.c
@@ -60,12 +60,16 @@ static void thd_body(void *v) {
   gpr_mu_unlock(&t->mu);
 }
 
+static void thd_body_joinable(void *v) { }
+
 /* Test that we can create a number of threads and wait for them. */
 static void test(void) {
   int i;
   gpr_thd_id thd;
+  gpr_thd_id thds[1000];
   struct test t;
   int n = 1000;
+  gpr_thd_options options = gpr_thd_options_default();
   gpr_mu_init(&t.mu);
   gpr_cv_init(&t.done_cv);
   t.n = n;
@@ -79,6 +83,13 @@ static void test(void) {
   }
   gpr_mu_unlock(&t.mu);
   GPR_ASSERT(t.n == 0);
+  gpr_thd_options_set_joinable(&options);
+  for (i = 0; i < n; i++) {
+    GPR_ASSERT(gpr_thd_new(&thds[i], &thd_body_joinable, NULL, &options));
+  }
+  for (i = 0; i < n; i++) {
+    gpr_thd_join(thds[i]);
+  }
 }
 
 /* ------------------------------------------------- */
diff --git a/test/core/support/tls_test.c b/test/core/support/tls_test.c
new file mode 100644
index 0000000000000000000000000000000000000000..8632fd44901dfea5f407d4394f07a30e2c76703d
--- /dev/null
+++ b/test/core/support/tls_test.c
@@ -0,0 +1,82 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+/* Test of gpr thread local storage support. */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <grpc/support/log.h>
+#include <grpc/support/sync.h>
+#include <grpc/support/thd.h>
+#include <grpc/support/tls.h>
+#include "test/core/util/test_config.h"
+
+#define NUM_THREADS 100
+
+GPR_TLS_DECL(test_var);
+
+static void thd_body(void *arg) {
+  gpr_intptr i;
+
+  GPR_ASSERT(gpr_tls_get(&test_var) == 0);
+
+  for (i = 0; i < 10000000; i++) {
+    gpr_tls_set(&test_var, i);
+    GPR_ASSERT(gpr_tls_get(&test_var) == i);
+  }
+}
+
+/* ------------------------------------------------- */
+
+int main(int argc, char *argv[]) {
+  gpr_thd_options opt = gpr_thd_options_default();
+  int i;
+  gpr_thd_id threads[NUM_THREADS];
+
+  grpc_test_init(argc, argv);
+
+  gpr_tls_init(&test_var);
+
+  gpr_thd_options_set_joinable(&opt);
+
+  for (i = 0; i < NUM_THREADS; i++) {
+    gpr_thd_new(&threads[i], thd_body, NULL, &opt);
+  }
+  for (i = 0; i < NUM_THREADS; i++) {
+    gpr_thd_join(threads[i]);
+  }
+
+  gpr_tls_destroy(&test_var);
+
+  return 0;
+}
diff --git a/test/cpp/end2end/async_end2end_test.cc b/test/cpp/end2end/async_end2end_test.cc
index 9938fcf12eb700fbb7e6f902e6426cdf115437e5..dd294d95163694ee35531f66bdf8ade0b4be19b5 100644
--- a/test/cpp/end2end/async_end2end_test.cc
+++ b/test/cpp/end2end/async_end2end_test.cc
@@ -35,8 +35,8 @@
 #include <memory>
 
 #include "test/core/util/test_config.h"
-#include "test/cpp/util/echo_duplicate.pb.h"
-#include "test/cpp/util/echo.pb.h"
+#include "test/cpp/util/echo_duplicate.grpc.pb.h"
+#include "test/cpp/util/echo.grpc.pb.h"
 #include "src/cpp/util/time.h"
 #include <grpc++/async_unary_call.h>
 #include <grpc++/channel_arguments.h>
diff --git a/test/cpp/end2end/end2end_test.cc b/test/cpp/end2end/end2end_test.cc
index 0d5db046df484b2d83e871711a2497741d03bc81..f96051cafac98c1984d302668202277a6fe4d143 100644
--- a/test/cpp/end2end/end2end_test.cc
+++ b/test/cpp/end2end/end2end_test.cc
@@ -35,8 +35,8 @@
 #include <thread>
 
 #include "test/core/util/test_config.h"
-#include "test/cpp/util/echo_duplicate.pb.h"
-#include "test/cpp/util/echo.pb.h"
+#include "test/cpp/util/echo_duplicate.grpc.pb.h"
+#include "test/cpp/util/echo.grpc.pb.h"
 #include "src/cpp/util/time.h"
 #include "src/cpp/server/thread_pool.h"
 #include <grpc++/channel_arguments.h>
diff --git a/test/cpp/end2end/generic_end2end_test.cc b/test/cpp/end2end/generic_end2end_test.cc
index 9cdd8c94d1299d0a626e3a8ec7cd5a30239ce82d..eb6f5369a922c20055778e1f64f275c3fb368d54 100644
--- a/test/cpp/end2end/generic_end2end_test.cc
+++ b/test/cpp/end2end/generic_end2end_test.cc
@@ -38,7 +38,7 @@
 #include "src/cpp/util/time.h"
 #include "test/core/util/port.h"
 #include "test/core/util/test_config.h"
-#include "test/cpp/util/echo.pb.h"
+#include "test/cpp/util/echo.grpc.pb.h"
 #include <grpc++/async_generic_service.h>
 #include <grpc++/async_unary_call.h>
 #include <grpc++/byte_buffer.h>
diff --git a/test/cpp/interop/client.cc b/test/cpp/interop/client.cc
index de6c6b7b77e6289ce5ed813ac4d72fd2f13a6dac..189cdeb0eedc4fd804c430b8ffa3ce19bba62368 100644
--- a/test/cpp/interop/client.cc
+++ b/test/cpp/interop/client.cc
@@ -31,29 +31,19 @@
  *
  */
 
-#include <chrono>
-#include <fstream>
 #include <memory>
-#include <sstream>
-#include <string>
-#include <thread>
 
 #include <unistd.h>
 
 #include <grpc/grpc.h>
 #include <grpc/support/log.h>
 #include <gflags/gflags.h>
-#include <grpc++/channel_arguments.h>
 #include <grpc++/channel_interface.h>
 #include <grpc++/client_context.h>
-#include <grpc++/create_channel.h>
-#include <grpc++/credentials.h>
 #include <grpc++/status.h>
 #include <grpc++/stream.h>
-#include "test/cpp/util/create_test_channel.h"
-#include "test/cpp/interop/test.pb.h"
-#include "test/cpp/interop/empty.pb.h"
-#include "test/cpp/interop/messages.pb.h"
+#include "test/cpp/interop/client_helper.h"
+#include "test/cpp/interop/interop_client.h"
 
 DEFINE_bool(enable_ssl, false, "Whether to use ssl/tls.");
 DEFINE_bool(use_prod_roots, false, "True to use SSL roots for google");
@@ -81,21 +71,8 @@ DEFINE_string(service_account_key_file, "",
               "Path to service account json key file.");
 DEFINE_string(oauth_scope, "", "Scope for OAuth tokens.");
 
-using grpc::ChannelInterface;
-using grpc::ClientContext;
-using grpc::ComputeEngineCredentials;
-using grpc::CreateTestChannel;
-using grpc::Credentials;
-using grpc::JWTCredentials;
-using grpc::ServiceAccountCredentials;
-using grpc::testing::ResponseParameters;
-using grpc::testing::SimpleRequest;
-using grpc::testing::SimpleResponse;
-using grpc::testing::StreamingInputCallRequest;
-using grpc::testing::StreamingInputCallResponse;
-using grpc::testing::StreamingOutputCallRequest;
-using grpc::testing::StreamingOutputCallResponse;
-using grpc::testing::TestService;
+using grpc::testing::CreateChannelForTestCase;
+using grpc::testing::GetServiceAccountJsonKey;
 
 // In some distros, gflags is in the namespace google, and in some others,
 // in gflags. This hack is enabling us to find both.
@@ -104,362 +81,48 @@ namespace gflags {}
 using namespace google;
 using namespace gflags;
 
-namespace {
-// The same value is defined by the Java client.
-const std::vector<int> request_stream_sizes = {27182, 8, 1828, 45904};
-const std::vector<int> response_stream_sizes = {31415, 9, 2653, 58979};
-const int kNumResponseMessages = 2000;
-const int kResponseMessageSize = 1030;
-const int kReceiveDelayMilliSeconds = 20;
-const int kLargeRequestSize = 314159;
-const int kLargeResponseSize = 271812;
-}  // namespace
-
-grpc::string GetServiceAccountJsonKey() {
-  static grpc::string json_key;
-  if (json_key.empty()) {
-    std::ifstream json_key_file(FLAGS_service_account_key_file);
-    std::stringstream key_stream;
-    key_stream << json_key_file.rdbuf();
-    json_key = key_stream.str();
-  }
-  return json_key;
-}
-
-std::shared_ptr<ChannelInterface> CreateChannelForTestCase(
-    const grpc::string& test_case) {
-  GPR_ASSERT(FLAGS_server_port);
-  const int host_port_buf_size = 1024;
-  char host_port[host_port_buf_size];
-  snprintf(host_port, host_port_buf_size, "%s:%d", FLAGS_server_host.c_str(),
-           FLAGS_server_port);
-
-  if (test_case == "service_account_creds") {
-    std::unique_ptr<Credentials> creds;
-    GPR_ASSERT(FLAGS_enable_ssl);
-    grpc::string json_key = GetServiceAccountJsonKey();
-    creds = ServiceAccountCredentials(json_key, FLAGS_oauth_scope,
-                                      std::chrono::hours(1));
-    return CreateTestChannel(host_port, FLAGS_server_host_override,
-                             FLAGS_enable_ssl, FLAGS_use_prod_roots, creds);
-  } else if (test_case == "compute_engine_creds") {
-    std::unique_ptr<Credentials> creds;
-    GPR_ASSERT(FLAGS_enable_ssl);
-    creds = ComputeEngineCredentials();
-    return CreateTestChannel(host_port, FLAGS_server_host_override,
-                             FLAGS_enable_ssl, FLAGS_use_prod_roots, creds);
-  } else if (test_case == "jwt_token_creds") {
-    std::unique_ptr<Credentials> creds;
-    GPR_ASSERT(FLAGS_enable_ssl);
-    grpc::string json_key = GetServiceAccountJsonKey();
-    creds = JWTCredentials(json_key, std::chrono::hours(1));
-    return CreateTestChannel(host_port, FLAGS_server_host_override,
-                             FLAGS_enable_ssl, FLAGS_use_prod_roots, creds);
-  } else {
-    return CreateTestChannel(host_port, FLAGS_server_host_override,
-                             FLAGS_enable_ssl, FLAGS_use_prod_roots);
-  }
-}
-
-void AssertOkOrPrintErrorStatus(const grpc::Status& s) {
-  if (s.IsOk()) {
-    return;
-  }
-  gpr_log(GPR_INFO, "Error status code: %d, message: %s", s.code(),
-          s.details().c_str());
-  GPR_ASSERT(0);
-}
-
-void DoEmpty() {
-  gpr_log(GPR_INFO, "Sending an empty rpc...");
-  std::shared_ptr<ChannelInterface> channel =
-      CreateChannelForTestCase("empty_unary");
-  std::unique_ptr<TestService::Stub> stub(TestService::NewStub(channel));
-
-  grpc::testing::Empty request = grpc::testing::Empty::default_instance();
-  grpc::testing::Empty response = grpc::testing::Empty::default_instance();
-  ClientContext context;
-
-  grpc::Status s = stub->EmptyCall(&context, request, &response);
-  AssertOkOrPrintErrorStatus(s);
-
-  gpr_log(GPR_INFO, "Empty rpc done.");
-}
-
-// Shared code to set large payload, make rpc and check response payload.
-void PerformLargeUnary(std::shared_ptr<ChannelInterface> channel,
-                       SimpleRequest* request, SimpleResponse* response) {
-  std::unique_ptr<TestService::Stub> stub(TestService::NewStub(channel));
-
-  ClientContext context;
-  request->set_response_type(grpc::testing::PayloadType::COMPRESSABLE);
-  request->set_response_size(kLargeResponseSize);
-  grpc::string payload(kLargeRequestSize, '\0');
-  request->mutable_payload()->set_body(payload.c_str(), kLargeRequestSize);
-
-  grpc::Status s = stub->UnaryCall(&context, *request, response);
-
-  AssertOkOrPrintErrorStatus(s);
-  GPR_ASSERT(response->payload().type() ==
-             grpc::testing::PayloadType::COMPRESSABLE);
-  GPR_ASSERT(response->payload().body() ==
-             grpc::string(kLargeResponseSize, '\0'));
-}
-
-void DoComputeEngineCreds() {
-  gpr_log(GPR_INFO,
-          "Sending a large unary rpc with compute engine credentials ...");
-  std::shared_ptr<ChannelInterface> channel =
-      CreateChannelForTestCase("compute_engine_creds");
-  SimpleRequest request;
-  SimpleResponse response;
-  request.set_fill_username(true);
-  request.set_fill_oauth_scope(true);
-  PerformLargeUnary(channel, &request, &response);
-  gpr_log(GPR_INFO, "Got username %s", response.username().c_str());
-  gpr_log(GPR_INFO, "Got oauth_scope %s", response.oauth_scope().c_str());
-  GPR_ASSERT(!response.username().empty());
-  GPR_ASSERT(response.username().c_str() == FLAGS_default_service_account);
-  GPR_ASSERT(!response.oauth_scope().empty());
-  const char* oauth_scope_str = response.oauth_scope().c_str();
-  GPR_ASSERT(FLAGS_oauth_scope.find(oauth_scope_str) != grpc::string::npos);
-  gpr_log(GPR_INFO, "Large unary with compute engine creds done.");
-}
-
-void DoServiceAccountCreds() {
-  gpr_log(GPR_INFO,
-          "Sending a large unary rpc with service account credentials ...");
-  std::shared_ptr<ChannelInterface> channel =
-      CreateChannelForTestCase("service_account_creds");
-  SimpleRequest request;
-  SimpleResponse response;
-  request.set_fill_username(true);
-  request.set_fill_oauth_scope(true);
-  PerformLargeUnary(channel, &request, &response);
-  GPR_ASSERT(!response.username().empty());
-  GPR_ASSERT(!response.oauth_scope().empty());
-  grpc::string json_key = GetServiceAccountJsonKey();
-  GPR_ASSERT(json_key.find(response.username()) != grpc::string::npos);
-  const char* oauth_scope_str = response.oauth_scope().c_str();
-  GPR_ASSERT(FLAGS_oauth_scope.find(oauth_scope_str) != grpc::string::npos);
-  gpr_log(GPR_INFO, "Large unary with service account creds done.");
-}
-
-void DoJwtTokenCreds() {
-  gpr_log(GPR_INFO, "Sending a large unary rpc with JWT token credentials ...");
-  std::shared_ptr<ChannelInterface> channel =
-      CreateChannelForTestCase("jwt_token_creds");
-  SimpleRequest request;
-  SimpleResponse response;
-  request.set_fill_username(true);
-  PerformLargeUnary(channel, &request, &response);
-  GPR_ASSERT(!response.username().empty());
-  grpc::string json_key = GetServiceAccountJsonKey();
-  GPR_ASSERT(json_key.find(response.username()) != grpc::string::npos);
-  gpr_log(GPR_INFO, "Large unary with JWT token creds done.");
-}
-
-void DoLargeUnary() {
-  gpr_log(GPR_INFO, "Sending a large unary rpc...");
-  std::shared_ptr<ChannelInterface> channel =
-      CreateChannelForTestCase("large_unary");
-  SimpleRequest request;
-  SimpleResponse response;
-  PerformLargeUnary(channel, &request, &response);
-  gpr_log(GPR_INFO, "Large unary done.");
-}
-
-void DoRequestStreaming() {
-  gpr_log(GPR_INFO, "Sending request steaming rpc ...");
-  std::shared_ptr<ChannelInterface> channel =
-      CreateChannelForTestCase("client_streaming");
-  std::unique_ptr<TestService::Stub> stub(TestService::NewStub(channel));
-
-  grpc::ClientContext context;
-  StreamingInputCallRequest request;
-  StreamingInputCallResponse response;
-
-  std::unique_ptr<grpc::ClientWriter<StreamingInputCallRequest>> stream(
-      stub->StreamingInputCall(&context, &response));
-
-  int aggregated_payload_size = 0;
-  for (unsigned int i = 0; i < request_stream_sizes.size(); ++i) {
-    grpc::testing::Payload* payload = request.mutable_payload();
-    payload->set_body(grpc::string(request_stream_sizes[i], '\0'));
-    GPR_ASSERT(stream->Write(request));
-    aggregated_payload_size += request_stream_sizes[i];
-  }
-  stream->WritesDone();
-  grpc::Status s = stream->Finish();
-
-  GPR_ASSERT(response.aggregated_payload_size() == aggregated_payload_size);
-  AssertOkOrPrintErrorStatus(s);
-  gpr_log(GPR_INFO, "Request streaming done.");
-}
-
-void DoResponseStreaming() {
-  gpr_log(GPR_INFO, "Receiving response steaming rpc ...");
-  std::shared_ptr<ChannelInterface> channel =
-      CreateChannelForTestCase("server_streaming");
-  std::unique_ptr<TestService::Stub> stub(TestService::NewStub(channel));
-
-  grpc::ClientContext context;
-  StreamingOutputCallRequest request;
-  for (unsigned int i = 0; i < response_stream_sizes.size(); ++i) {
-    ResponseParameters* response_parameter = request.add_response_parameters();
-    response_parameter->set_size(response_stream_sizes[i]);
-  }
-  StreamingOutputCallResponse response;
-  std::unique_ptr<grpc::ClientReader<StreamingOutputCallResponse>> stream(
-      stub->StreamingOutputCall(&context, request));
-
-  unsigned int i = 0;
-  while (stream->Read(&response)) {
-    GPR_ASSERT(response.payload().body() ==
-               grpc::string(response_stream_sizes[i], '\0'));
-    ++i;
-  }
-  GPR_ASSERT(response_stream_sizes.size() == i);
-  grpc::Status s = stream->Finish();
-
-  AssertOkOrPrintErrorStatus(s);
-  gpr_log(GPR_INFO, "Response streaming done.");
-}
-
-void DoResponseStreamingWithSlowConsumer() {
-  gpr_log(GPR_INFO, "Receiving response steaming rpc with slow consumer ...");
-  std::shared_ptr<ChannelInterface> channel =
-      CreateChannelForTestCase("slow_consumer");
-  std::unique_ptr<TestService::Stub> stub(TestService::NewStub(channel));
-
-  grpc::ClientContext context;
-  StreamingOutputCallRequest request;
-
-  for (int i = 0; i < kNumResponseMessages; ++i) {
-    ResponseParameters* response_parameter = request.add_response_parameters();
-    response_parameter->set_size(kResponseMessageSize);
-  }
-  StreamingOutputCallResponse response;
-  std::unique_ptr<grpc::ClientReader<StreamingOutputCallResponse>> stream(
-      stub->StreamingOutputCall(&context, request));
-
-  int i = 0;
-  while (stream->Read(&response)) {
-    GPR_ASSERT(response.payload().body() ==
-               grpc::string(kResponseMessageSize, '\0'));
-    gpr_log(GPR_INFO, "received message %d", i);
-    usleep(kReceiveDelayMilliSeconds * 1000);
-    ++i;
-  }
-  GPR_ASSERT(kNumResponseMessages == i);
-  grpc::Status s = stream->Finish();
-
-  AssertOkOrPrintErrorStatus(s);
-  gpr_log(GPR_INFO, "Response streaming done.");
-}
-
-void DoHalfDuplex() {
-  gpr_log(GPR_INFO, "Sending half-duplex streaming rpc ...");
-  std::shared_ptr<ChannelInterface> channel =
-      CreateChannelForTestCase("half_duplex");
-  std::unique_ptr<TestService::Stub> stub(TestService::NewStub(channel));
-
-  grpc::ClientContext context;
-  std::unique_ptr<grpc::ClientReaderWriter<StreamingOutputCallRequest,
-                                           StreamingOutputCallResponse>>
-      stream(stub->HalfDuplexCall(&context));
-
-  StreamingOutputCallRequest request;
-  ResponseParameters* response_parameter = request.add_response_parameters();
-  for (unsigned int i = 0; i < response_stream_sizes.size(); ++i) {
-    response_parameter->set_size(response_stream_sizes[i]);
-    GPR_ASSERT(stream->Write(request));
-  }
-  stream->WritesDone();
-
-  unsigned int i = 0;
-  StreamingOutputCallResponse response;
-  while (stream->Read(&response)) {
-    GPR_ASSERT(response.payload().has_body());
-    GPR_ASSERT(response.payload().body() ==
-               grpc::string(response_stream_sizes[i], '\0'));
-    ++i;
-  }
-  GPR_ASSERT(response_stream_sizes.size() == i);
-  grpc::Status s = stream->Finish();
-  AssertOkOrPrintErrorStatus(s);
-  gpr_log(GPR_INFO, "Half-duplex streaming rpc done.");
-}
-
-void DoPingPong() {
-  gpr_log(GPR_INFO, "Sending Ping Pong streaming rpc ...");
-  std::shared_ptr<ChannelInterface> channel =
-      CreateChannelForTestCase("ping_pong");
-  std::unique_ptr<TestService::Stub> stub(TestService::NewStub(channel));
-
-  grpc::ClientContext context;
-  std::unique_ptr<grpc::ClientReaderWriter<StreamingOutputCallRequest,
-                                           StreamingOutputCallResponse>>
-      stream(stub->FullDuplexCall(&context));
-
-  StreamingOutputCallRequest request;
-  request.set_response_type(grpc::testing::PayloadType::COMPRESSABLE);
-  ResponseParameters* response_parameter = request.add_response_parameters();
-  grpc::testing::Payload* payload = request.mutable_payload();
-  StreamingOutputCallResponse response;
-  for (unsigned int i = 0; i < request_stream_sizes.size(); ++i) {
-    response_parameter->set_size(response_stream_sizes[i]);
-    payload->set_body(grpc::string(request_stream_sizes[i], '\0'));
-    GPR_ASSERT(stream->Write(request));
-    GPR_ASSERT(stream->Read(&response));
-    GPR_ASSERT(response.payload().has_body());
-    GPR_ASSERT(response.payload().body() ==
-               grpc::string(response_stream_sizes[i], '\0'));
-  }
-
-  stream->WritesDone();
-  GPR_ASSERT(!stream->Read(&response));
-  grpc::Status s = stream->Finish();
-  AssertOkOrPrintErrorStatus(s);
-  gpr_log(GPR_INFO, "Ping pong streaming done.");
-}
-
 int main(int argc, char** argv) {
   grpc_init();
 
   ParseCommandLineFlags(&argc, &argv, true);
 
+  grpc::testing::InteropClient client(
+      CreateChannelForTestCase(FLAGS_test_case));
   if (FLAGS_test_case == "empty_unary") {
-    DoEmpty();
+    client.DoEmpty();
   } else if (FLAGS_test_case == "large_unary") {
-    DoLargeUnary();
+    client.DoLargeUnary();
   } else if (FLAGS_test_case == "client_streaming") {
-    DoRequestStreaming();
+    client.DoRequestStreaming();
   } else if (FLAGS_test_case == "server_streaming") {
-    DoResponseStreaming();
+    client.DoResponseStreaming();
   } else if (FLAGS_test_case == "slow_consumer") {
-    DoResponseStreamingWithSlowConsumer();
+    client.DoResponseStreamingWithSlowConsumer();
   } else if (FLAGS_test_case == "half_duplex") {
-    DoHalfDuplex();
+    client.DoHalfDuplex();
   } else if (FLAGS_test_case == "ping_pong") {
-    DoPingPong();
+    client.DoPingPong();
   } else if (FLAGS_test_case == "service_account_creds") {
-    DoServiceAccountCreds();
+    grpc::string json_key = GetServiceAccountJsonKey();
+    client.DoServiceAccountCreds(json_key, FLAGS_oauth_scope);
   } else if (FLAGS_test_case == "compute_engine_creds") {
-    DoComputeEngineCreds();
+    client.DoComputeEngineCreds(FLAGS_default_service_account,
+                                FLAGS_oauth_scope);
   } else if (FLAGS_test_case == "jwt_token_creds") {
-    DoJwtTokenCreds();
+    grpc::string json_key = GetServiceAccountJsonKey();
+    client.DoJwtTokenCreds(json_key);
   } else if (FLAGS_test_case == "all") {
-    DoEmpty();
-    DoLargeUnary();
-    DoRequestStreaming();
-    DoResponseStreaming();
-    DoHalfDuplex();
-    DoPingPong();
+    client.DoEmpty();
+    client.DoLargeUnary();
+    client.DoRequestStreaming();
+    client.DoResponseStreaming();
+    client.DoHalfDuplex();
+    client.DoPingPong();
     // service_account_creds and jwt_token_creds can only run with ssl.
     if (FLAGS_enable_ssl) {
-      DoServiceAccountCreds();
-      DoJwtTokenCreds();
+      grpc::string json_key = GetServiceAccountJsonKey();
+      client.DoServiceAccountCreds(json_key, FLAGS_oauth_scope);
+      client.DoJwtTokenCreds(json_key);
     }
     // compute_engine_creds only runs in GCE.
   } else {
@@ -470,6 +133,7 @@ int main(int argc, char** argv) {
         "service_account_creds|compute_engine_creds|jwt_token_creds",
         FLAGS_test_case.c_str());
   }
+  client.Reset(nullptr);
 
   grpc_shutdown();
   return 0;
diff --git a/test/cpp/interop/client_helper.cc b/test/cpp/interop/client_helper.cc
new file mode 100644
index 0000000000000000000000000000000000000000..362e6af353bab5c967ed55695e377fe3bfd03c5d
--- /dev/null
+++ b/test/cpp/interop/client_helper.cc
@@ -0,0 +1,119 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "test/cpp/interop/client_helper.h"
+
+#include <fstream>
+#include <memory>
+#include <sstream>
+
+#include <unistd.h>
+
+#include <grpc/grpc.h>
+#include <grpc/support/log.h>
+#include <gflags/gflags.h>
+#include <grpc++/channel_arguments.h>
+#include <grpc++/channel_interface.h>
+#include <grpc++/create_channel.h>
+#include <grpc++/credentials.h>
+#include <grpc++/stream.h>
+#include "test/cpp/util/create_test_channel.h"
+
+DECLARE_bool(enable_ssl);
+DECLARE_bool(use_prod_roots);
+DECLARE_int32(server_port);
+DECLARE_string(server_host);
+DECLARE_string(server_host_override);
+DECLARE_string(test_case);
+DECLARE_string(default_service_account);
+DECLARE_string(service_account_key_file);
+DECLARE_string(oauth_scope);
+
+// In some distros, gflags is in the namespace google, and in some others,
+// in gflags. This hack is enabling us to find both.
+namespace google {}
+namespace gflags {}
+using namespace google;
+using namespace gflags;
+
+namespace grpc {
+namespace testing {
+
+grpc::string GetServiceAccountJsonKey() {
+  static grpc::string json_key;
+  if (json_key.empty()) {
+    std::ifstream json_key_file(FLAGS_service_account_key_file);
+    std::stringstream key_stream;
+    key_stream << json_key_file.rdbuf();
+    json_key = key_stream.str();
+  }
+  return json_key;
+}
+
+std::shared_ptr<ChannelInterface> CreateChannelForTestCase(
+    const grpc::string& test_case) {
+  GPR_ASSERT(FLAGS_server_port);
+  const int host_port_buf_size = 1024;
+  char host_port[host_port_buf_size];
+  snprintf(host_port, host_port_buf_size, "%s:%d", FLAGS_server_host.c_str(),
+           FLAGS_server_port);
+
+  if (test_case == "service_account_creds") {
+    std::unique_ptr<Credentials> creds;
+    GPR_ASSERT(FLAGS_enable_ssl);
+    grpc::string json_key = GetServiceAccountJsonKey();
+    creds = ServiceAccountCredentials(json_key, FLAGS_oauth_scope,
+                                      std::chrono::hours(1));
+    return CreateTestChannel(host_port, FLAGS_server_host_override,
+                             FLAGS_enable_ssl, FLAGS_use_prod_roots, creds);
+  } else if (test_case == "compute_engine_creds") {
+    std::unique_ptr<Credentials> creds;
+    GPR_ASSERT(FLAGS_enable_ssl);
+    creds = ComputeEngineCredentials();
+    return CreateTestChannel(host_port, FLAGS_server_host_override,
+                             FLAGS_enable_ssl, FLAGS_use_prod_roots, creds);
+  } else if (test_case == "jwt_token_creds") {
+    std::unique_ptr<Credentials> creds;
+    GPR_ASSERT(FLAGS_enable_ssl);
+    grpc::string json_key = GetServiceAccountJsonKey();
+    creds = JWTCredentials(json_key, std::chrono::hours(1));
+    return CreateTestChannel(host_port, FLAGS_server_host_override,
+                             FLAGS_enable_ssl, FLAGS_use_prod_roots, creds);
+  } else {
+    return CreateTestChannel(host_port, FLAGS_server_host_override,
+                             FLAGS_enable_ssl, FLAGS_use_prod_roots);
+  }
+}
+
+}  // namespace testing
+}  // namespace grpc
diff --git a/src/ruby/ext/grpc/rb_metadata.h b/test/cpp/interop/client_helper.h
similarity index 71%
rename from src/ruby/ext/grpc/rb_metadata.h
rename to test/cpp/interop/client_helper.h
index 251072f658d885a37096c0757602d84d86e157ac..897f974026feeb94be3e871d0c8b8f811d560a3b 100644
--- a/src/ruby/ext/grpc/rb_metadata.h
+++ b/test/cpp/interop/client_helper.h
@@ -31,23 +31,23 @@
  *
  */
 
-#ifndef GRPC_RB_METADATA_H_
-#define GRPC_RB_METADATA_H_
+#ifndef GRPC_TEST_CPP_INTEROP_CLIENT_HELPER_H
+#define GRPC_TEST_CPP_INTEROP_CLIENT_HELPER_H
 
-#include <grpc/grpc.h>
-#include <ruby.h>
+#include <memory>
 
-/* rb_cMetadata is the Metadata class whose instances proxy grpc_metadata. */
-extern VALUE rb_cMetadata;
+#include <grpc++/config.h>
+#include <grpc++/channel_interface.h>
 
-/* grpc_rb_metadata_create_with_mark creates a grpc_rb_metadata with a ruby mark
- * object that will be kept alive while the metadata is alive. */
-extern VALUE grpc_rb_metadata_create_with_mark(VALUE mark, grpc_metadata* md);
+namespace grpc {
+namespace testing {
 
-/* Gets the wrapped metadata from the ruby wrapper */
-grpc_metadata* grpc_rb_get_wrapped_metadata(VALUE v);
+grpc::string GetServiceAccountJsonKey();
 
-/* Initializes the Metadata class. */
-void Init_grpc_metadata();
+std::shared_ptr<ChannelInterface> CreateChannelForTestCase(
+    const grpc::string& test_case);
 
-#endif /* GRPC_RB_METADATA_H_ */
+}  // namespace testing
+}  // namespace grpc
+
+#endif  // GRPC_TEST_CPP_INTEROP_CLIENT_HELPER_H
diff --git a/test/cpp/interop/interop_client.cc b/test/cpp/interop/interop_client.cc
new file mode 100644
index 0000000000000000000000000000000000000000..fd9c2e024abff923279cb35490c8c89a4c6b799e
--- /dev/null
+++ b/test/cpp/interop/interop_client.cc
@@ -0,0 +1,311 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "test/cpp/interop/interop_client.h"
+
+#include <memory>
+
+#include <unistd.h>
+
+#include <grpc/grpc.h>
+#include <grpc/support/log.h>
+#include <grpc++/channel_interface.h>
+#include <grpc++/client_context.h>
+#include <grpc++/status.h>
+#include <grpc++/stream.h>
+#include "test/cpp/interop/test.grpc.pb.h"
+#include "test/cpp/interop/empty.grpc.pb.h"
+#include "test/cpp/interop/messages.grpc.pb.h"
+
+namespace grpc {
+namespace testing {
+
+namespace {
+// The same value is defined by the Java client.
+const std::vector<int> request_stream_sizes = {27182, 8, 1828, 45904};
+const std::vector<int> response_stream_sizes = {31415, 9, 2653, 58979};
+const int kNumResponseMessages = 2000;
+const int kResponseMessageSize = 1030;
+const int kReceiveDelayMilliSeconds = 20;
+const int kLargeRequestSize = 314159;
+const int kLargeResponseSize = 271812;
+}  // namespace
+
+InteropClient::InteropClient(std::shared_ptr<ChannelInterface> channel)
+    : channel_(channel) {}
+
+void InteropClient::AssertOkOrPrintErrorStatus(const Status& s) {
+  if (s.IsOk()) {
+    return;
+  }
+  gpr_log(GPR_INFO, "Error status code: %d, message: %s", s.code(),
+          s.details().c_str());
+  GPR_ASSERT(0);
+}
+
+void InteropClient::DoEmpty() {
+  gpr_log(GPR_INFO, "Sending an empty rpc...");
+  std::unique_ptr<TestService::Stub> stub(TestService::NewStub(channel_));
+
+  Empty request = Empty::default_instance();
+  Empty response = Empty::default_instance();
+  ClientContext context;
+
+  Status s = stub->EmptyCall(&context, request, &response);
+  AssertOkOrPrintErrorStatus(s);
+
+  gpr_log(GPR_INFO, "Empty rpc done.");
+}
+
+// Shared code to set large payload, make rpc and check response payload.
+void InteropClient::PerformLargeUnary(SimpleRequest* request,
+                                      SimpleResponse* response) {
+  std::unique_ptr<TestService::Stub> stub(TestService::NewStub(channel_));
+
+  ClientContext context;
+  request->set_response_type(PayloadType::COMPRESSABLE);
+  request->set_response_size(kLargeResponseSize);
+  grpc::string payload(kLargeRequestSize, '\0');
+  request->mutable_payload()->set_body(payload.c_str(), kLargeRequestSize);
+
+  Status s = stub->UnaryCall(&context, *request, response);
+
+  AssertOkOrPrintErrorStatus(s);
+  GPR_ASSERT(response->payload().type() == PayloadType::COMPRESSABLE);
+  GPR_ASSERT(response->payload().body() ==
+             grpc::string(kLargeResponseSize, '\0'));
+}
+
+void InteropClient::DoComputeEngineCreds(
+    const grpc::string& default_service_account,
+    const grpc::string& oauth_scope) {
+  gpr_log(GPR_INFO,
+          "Sending a large unary rpc with compute engine credentials ...");
+  SimpleRequest request;
+  SimpleResponse response;
+  request.set_fill_username(true);
+  request.set_fill_oauth_scope(true);
+  PerformLargeUnary(&request, &response);
+  gpr_log(GPR_INFO, "Got username %s", response.username().c_str());
+  gpr_log(GPR_INFO, "Got oauth_scope %s", response.oauth_scope().c_str());
+  GPR_ASSERT(!response.username().empty());
+  GPR_ASSERT(response.username().c_str() == default_service_account);
+  GPR_ASSERT(!response.oauth_scope().empty());
+  const char* oauth_scope_str = response.oauth_scope().c_str();
+  GPR_ASSERT(oauth_scope.find(oauth_scope_str) != grpc::string::npos);
+  gpr_log(GPR_INFO, "Large unary with compute engine creds done.");
+}
+
+void InteropClient::DoServiceAccountCreds(const grpc::string& username,
+                                          const grpc::string& oauth_scope) {
+  gpr_log(GPR_INFO,
+          "Sending a large unary rpc with service account credentials ...");
+  SimpleRequest request;
+  SimpleResponse response;
+  request.set_fill_username(true);
+  request.set_fill_oauth_scope(true);
+  PerformLargeUnary(&request, &response);
+  GPR_ASSERT(!response.username().empty());
+  GPR_ASSERT(!response.oauth_scope().empty());
+  GPR_ASSERT(username.find(response.username()) != grpc::string::npos);
+  const char* oauth_scope_str = response.oauth_scope().c_str();
+  GPR_ASSERT(oauth_scope.find(oauth_scope_str) != grpc::string::npos);
+  gpr_log(GPR_INFO, "Large unary with service account creds done.");
+}
+
+void InteropClient::DoJwtTokenCreds(const grpc::string& username) {
+  gpr_log(GPR_INFO, "Sending a large unary rpc with JWT token credentials ...");
+  SimpleRequest request;
+  SimpleResponse response;
+  request.set_fill_username(true);
+  PerformLargeUnary(&request, &response);
+  GPR_ASSERT(!response.username().empty());
+  GPR_ASSERT(username.find(response.username()) != grpc::string::npos);
+  gpr_log(GPR_INFO, "Large unary with JWT token creds done.");
+}
+
+void InteropClient::DoLargeUnary() {
+  gpr_log(GPR_INFO, "Sending a large unary rpc...");
+  SimpleRequest request;
+  SimpleResponse response;
+  PerformLargeUnary(&request, &response);
+  gpr_log(GPR_INFO, "Large unary done.");
+}
+
+void InteropClient::DoRequestStreaming() {
+  gpr_log(GPR_INFO, "Sending request steaming rpc ...");
+  std::unique_ptr<TestService::Stub> stub(TestService::NewStub(channel_));
+
+  ClientContext context;
+  StreamingInputCallRequest request;
+  StreamingInputCallResponse response;
+
+  std::unique_ptr<ClientWriter<StreamingInputCallRequest>> stream(
+      stub->StreamingInputCall(&context, &response));
+
+  int aggregated_payload_size = 0;
+  for (unsigned int i = 0; i < request_stream_sizes.size(); ++i) {
+    Payload* payload = request.mutable_payload();
+    payload->set_body(grpc::string(request_stream_sizes[i], '\0'));
+    GPR_ASSERT(stream->Write(request));
+    aggregated_payload_size += request_stream_sizes[i];
+  }
+  stream->WritesDone();
+  Status s = stream->Finish();
+
+  GPR_ASSERT(response.aggregated_payload_size() == aggregated_payload_size);
+  AssertOkOrPrintErrorStatus(s);
+  gpr_log(GPR_INFO, "Request streaming done.");
+}
+
+void InteropClient::DoResponseStreaming() {
+  gpr_log(GPR_INFO, "Receiving response steaming rpc ...");
+  std::unique_ptr<TestService::Stub> stub(TestService::NewStub(channel_));
+
+  ClientContext context;
+  StreamingOutputCallRequest request;
+  for (unsigned int i = 0; i < response_stream_sizes.size(); ++i) {
+    ResponseParameters* response_parameter = request.add_response_parameters();
+    response_parameter->set_size(response_stream_sizes[i]);
+  }
+  StreamingOutputCallResponse response;
+  std::unique_ptr<ClientReader<StreamingOutputCallResponse>> stream(
+      stub->StreamingOutputCall(&context, request));
+
+  unsigned int i = 0;
+  while (stream->Read(&response)) {
+    GPR_ASSERT(response.payload().body() ==
+               grpc::string(response_stream_sizes[i], '\0'));
+    ++i;
+  }
+  GPR_ASSERT(response_stream_sizes.size() == i);
+  Status s = stream->Finish();
+
+  AssertOkOrPrintErrorStatus(s);
+  gpr_log(GPR_INFO, "Response streaming done.");
+}
+
+void InteropClient::DoResponseStreamingWithSlowConsumer() {
+  gpr_log(GPR_INFO, "Receiving response steaming rpc with slow consumer ...");
+  std::unique_ptr<TestService::Stub> stub(TestService::NewStub(channel_));
+
+  ClientContext context;
+  StreamingOutputCallRequest request;
+
+  for (int i = 0; i < kNumResponseMessages; ++i) {
+    ResponseParameters* response_parameter = request.add_response_parameters();
+    response_parameter->set_size(kResponseMessageSize);
+  }
+  StreamingOutputCallResponse response;
+  std::unique_ptr<ClientReader<StreamingOutputCallResponse>> stream(
+      stub->StreamingOutputCall(&context, request));
+
+  int i = 0;
+  while (stream->Read(&response)) {
+    GPR_ASSERT(response.payload().body() ==
+               grpc::string(kResponseMessageSize, '\0'));
+    gpr_log(GPR_INFO, "received message %d", i);
+    usleep(kReceiveDelayMilliSeconds * 1000);
+    ++i;
+  }
+  GPR_ASSERT(kNumResponseMessages == i);
+  Status s = stream->Finish();
+
+  AssertOkOrPrintErrorStatus(s);
+  gpr_log(GPR_INFO, "Response streaming done.");
+}
+
+void InteropClient::DoHalfDuplex() {
+  gpr_log(GPR_INFO, "Sending half-duplex streaming rpc ...");
+  std::unique_ptr<TestService::Stub> stub(TestService::NewStub(channel_));
+
+  ClientContext context;
+  std::unique_ptr<ClientReaderWriter<StreamingOutputCallRequest,
+                                     StreamingOutputCallResponse>>
+      stream(stub->HalfDuplexCall(&context));
+
+  StreamingOutputCallRequest request;
+  ResponseParameters* response_parameter = request.add_response_parameters();
+  for (unsigned int i = 0; i < response_stream_sizes.size(); ++i) {
+    response_parameter->set_size(response_stream_sizes[i]);
+    GPR_ASSERT(stream->Write(request));
+  }
+  stream->WritesDone();
+
+  unsigned int i = 0;
+  StreamingOutputCallResponse response;
+  while (stream->Read(&response)) {
+    GPR_ASSERT(response.payload().has_body());
+    GPR_ASSERT(response.payload().body() ==
+               grpc::string(response_stream_sizes[i], '\0'));
+    ++i;
+  }
+  GPR_ASSERT(response_stream_sizes.size() == i);
+  Status s = stream->Finish();
+  AssertOkOrPrintErrorStatus(s);
+  gpr_log(GPR_INFO, "Half-duplex streaming rpc done.");
+}
+
+void InteropClient::DoPingPong() {
+  gpr_log(GPR_INFO, "Sending Ping Pong streaming rpc ...");
+  std::unique_ptr<TestService::Stub> stub(TestService::NewStub(channel_));
+
+  ClientContext context;
+  std::unique_ptr<ClientReaderWriter<StreamingOutputCallRequest,
+                                     StreamingOutputCallResponse>>
+      stream(stub->FullDuplexCall(&context));
+
+  StreamingOutputCallRequest request;
+  request.set_response_type(PayloadType::COMPRESSABLE);
+  ResponseParameters* response_parameter = request.add_response_parameters();
+  Payload* payload = request.mutable_payload();
+  StreamingOutputCallResponse response;
+  for (unsigned int i = 0; i < request_stream_sizes.size(); ++i) {
+    response_parameter->set_size(response_stream_sizes[i]);
+    payload->set_body(grpc::string(request_stream_sizes[i], '\0'));
+    GPR_ASSERT(stream->Write(request));
+    GPR_ASSERT(stream->Read(&response));
+    GPR_ASSERT(response.payload().has_body());
+    GPR_ASSERT(response.payload().body() ==
+               grpc::string(response_stream_sizes[i], '\0'));
+  }
+
+  stream->WritesDone();
+  GPR_ASSERT(!stream->Read(&response));
+  Status s = stream->Finish();
+  AssertOkOrPrintErrorStatus(s);
+  gpr_log(GPR_INFO, "Ping pong streaming done.");
+}
+
+}  // namespace testing
+}  // namespace grpc
diff --git a/test/cpp/interop/interop_client.h b/test/cpp/interop/interop_client.h
new file mode 100644
index 0000000000000000000000000000000000000000..b0ab320f8dc78d4c5e741c6e62c3b64c90903576
--- /dev/null
+++ b/test/cpp/interop/interop_client.h
@@ -0,0 +1,79 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPC_TEST_CPP_INTEROP_INTEROP_CLIENT_H
+#define GRPC_TEST_CPP_INTEROP_INTEROP_CLIENT_H
+#include <memory>
+
+#include <grpc/grpc.h>
+#include <grpc++/channel_interface.h>
+#include <grpc++/status.h>
+#include "test/cpp/interop/messages.grpc.pb.h"
+
+namespace grpc {
+namespace testing {
+
+class InteropClient {
+ public:
+  explicit InteropClient(std::shared_ptr<ChannelInterface> channel);
+  ~InteropClient() {}
+
+  void Reset(std::shared_ptr<ChannelInterface> channel) { channel_ = channel; }
+
+  void DoEmpty();
+  void DoLargeUnary();
+  void DoPingPong();
+  void DoHalfDuplex();
+  void DoRequestStreaming();
+  void DoResponseStreaming();
+  void DoResponseStreamingWithSlowConsumer();
+  // Auth tests.
+  // username is a string containing the user email
+  void DoJwtTokenCreds(const grpc::string& username);
+  void DoComputeEngineCreds(const grpc::string& default_service_account,
+                            const grpc::string& oauth_scope);
+  // username is a string containing the user email
+  void DoServiceAccountCreds(const grpc::string& username,
+                             const grpc::string& oauth_scope);
+
+ private:
+  void PerformLargeUnary(SimpleRequest* request, SimpleResponse* response);
+  void AssertOkOrPrintErrorStatus(const Status& s);
+
+  std::shared_ptr<ChannelInterface> channel_;
+};
+
+}  // namespace testing
+}  // namespace grpc
+
+#endif  // GRPC_TEST_CPP_INTEROP_INTEROP_CLIENT_H
diff --git a/test/cpp/interop/server.cc b/test/cpp/interop/server.cc
index 780a7370acbf8b8583fda7ee655587c92ef250d8..d87493b8132b4d2c6f4d6fd0510a18a3fe8637e7 100644
--- a/test/cpp/interop/server.cc
+++ b/test/cpp/interop/server.cc
@@ -41,7 +41,6 @@
 #include <gflags/gflags.h>
 #include <grpc/grpc.h>
 #include <grpc/support/log.h>
-#include "test/core/end2end/data/ssl_test_data.h"
 #include <grpc++/config.h>
 #include <grpc++/server.h>
 #include <grpc++/server_builder.h>
@@ -49,9 +48,10 @@
 #include <grpc++/server_credentials.h>
 #include <grpc++/status.h>
 #include <grpc++/stream.h>
-#include "test/cpp/interop/test.pb.h"
-#include "test/cpp/interop/empty.pb.h"
-#include "test/cpp/interop/messages.pb.h"
+#include "test/cpp/interop/test.grpc.pb.h"
+#include "test/cpp/interop/empty.grpc.pb.h"
+#include "test/cpp/interop/messages.grpc.pb.h"
+#include "test/cpp/interop/server_helper.h"
 
 DEFINE_bool(enable_ssl, false, "Whether to use ssl/tls.");
 DEFINE_int32(port, 0, "Server port.");
@@ -211,15 +211,8 @@ void RunServer() {
 
   ServerBuilder builder;
   builder.RegisterService(&service);
-  std::shared_ptr<ServerCredentials> creds = grpc::InsecureServerCredentials();
-  if (FLAGS_enable_ssl) {
-    SslServerCredentialsOptions::PemKeyCertPair pkcp = {test_server1_key,
-							test_server1_cert};
-    SslServerCredentialsOptions ssl_opts;
-    ssl_opts.pem_root_certs = "";
-    ssl_opts.pem_key_cert_pairs.push_back(pkcp);
-    creds = grpc::SslServerCredentials(ssl_opts);
-  }
+  std::shared_ptr<ServerCredentials> creds =
+      grpc::testing::CreateInteropServerCredentials();
   builder.AddListeningPort(server_address.str(), creds);
   std::unique_ptr<Server> server(builder.BuildAndStart());
   gpr_log(GPR_INFO, "Server listening on %s", server_address.str().c_str());
diff --git a/test/cpp/interop/server_helper.cc b/test/cpp/interop/server_helper.cc
new file mode 100644
index 0000000000000000000000000000000000000000..56597c83c4ca3c8e332c491be6a89949f8b108fa
--- /dev/null
+++ b/test/cpp/interop/server_helper.cc
@@ -0,0 +1,69 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "test/cpp/interop/server_helper.h"
+
+#include <memory>
+
+#include <gflags/gflags.h>
+#include "test/core/end2end/data/ssl_test_data.h"
+#include <grpc++/config.h>
+#include <grpc++/server_credentials.h>
+
+DECLARE_bool(enable_ssl);
+
+// In some distros, gflags is in the namespace google, and in some others,
+// in gflags. This hack is enabling us to find both.
+namespace google {}
+namespace gflags {}
+using namespace google;
+using namespace gflags;
+
+namespace grpc {
+namespace testing {
+
+std::shared_ptr<ServerCredentials> CreateInteropServerCredentials() {
+  if (FLAGS_enable_ssl) {
+    SslServerCredentialsOptions::PemKeyCertPair pkcp = {test_server1_key,
+                                                        test_server1_cert};
+    SslServerCredentialsOptions ssl_opts;
+    ssl_opts.pem_root_certs = "";
+    ssl_opts.pem_key_cert_pairs.push_back(pkcp);
+    return SslServerCredentials(ssl_opts);
+  } else {
+    return InsecureServerCredentials();
+  }
+}
+
+}  // namespace testing
+}  // namespace grpc
diff --git a/test/cpp/interop/server_helper.h b/test/cpp/interop/server_helper.h
new file mode 100644
index 0000000000000000000000000000000000000000..f98e67bb67341d63ab4287420b5dbb0fdf1598fb
--- /dev/null
+++ b/test/cpp/interop/server_helper.h
@@ -0,0 +1,49 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPC_TEST_CPP_INTEROP_SERVER_HELPER_H
+#define GRPC_TEST_CPP_INTEROP_SERVER_HELPER_H
+
+#include <memory>
+
+#include <grpc++/server_credentials.h>
+
+namespace grpc {
+namespace testing {
+
+std::shared_ptr<ServerCredentials> CreateInteropServerCredentials();
+
+}  // namespace testing
+}  // namespace grpc
+
+#endif  // GRPC_TEST_CPP_INTEROP_SERVER_HELPER_H
diff --git a/test/cpp/qps/client.h b/test/cpp/qps/client.h
index cae7f44537c488ad5b993f456fa9d2c04518fb30..2dc5b3860f3852cff54750388546f7d8377e4bdb 100644
--- a/test/cpp/qps/client.h
+++ b/test/cpp/qps/client.h
@@ -36,7 +36,7 @@
 
 #include "test/cpp/qps/histogram.h"
 #include "test/cpp/qps/timer.h"
-#include "test/cpp/qps/qpstest.pb.h"
+#include "test/cpp/qps/qpstest.grpc.pb.h"
 
 #include <condition_variable>
 #include <mutex>
@@ -104,7 +104,7 @@ class Client {
 
   void EndThreads() { threads_.clear(); }
 
-  virtual void ThreadFunc(Histogram* histogram, size_t thread_idx) = 0;
+  virtual bool ThreadFunc(Histogram* histogram, size_t thread_idx) = 0;
 
  private:
   class Thread {
@@ -113,20 +113,24 @@ class Client {
         : done_(false),
           new_(nullptr),
           impl_([this, idx, client]() {
-            for (;;) {
-              // run the loop body
-	      client->ThreadFunc(&histogram_, idx);
-              // lock, see if we're done
-              std::lock_guard<std::mutex> g(mu_);
-              if (done_) {return;}
-	      // check if we're marking, swap out the histogram if so
-	      if (new_) {
-                new_->Swap(&histogram_);
-                new_ = nullptr;
-                cv_.notify_one();
+              for (;;) {
+                // run the loop body
+        	      bool thread_still_ok = client->ThreadFunc(&histogram_, idx);
+                // lock, see if we're done
+                std::lock_guard<std::mutex> g(mu_);
+                if (!thread_still_ok) {
+                  gpr_log(GPR_ERROR, "Finishing client thread due to RPC error");
+                  done_ = true;
+                }
+                if (done_) {return;}
+        	      // check if we're marking, swap out the histogram if so
+        	      if (new_) {
+                        new_->Swap(&histogram_);
+                        new_ = nullptr;
+                        cv_.notify_one();
+                }
               }
-            }
-          }) {}
+            }) {}
 
     ~Thread() {
       {
diff --git a/test/cpp/qps/client_async.cc b/test/cpp/qps/client_async.cc
index 1ed3c7157fc39c92ae3e47ac28491125b9100c82..0a6d9beeca6ca156020814b7e27f5066c0232603 100644
--- a/test/cpp/qps/client_async.cc
+++ b/test/cpp/qps/client_async.cc
@@ -48,7 +48,7 @@
 #include <grpc++/status.h>
 #include <grpc++/stream.h>
 #include "test/cpp/util/create_test_channel.h"
-#include "test/cpp/qps/qpstest.pb.h"
+#include "test/cpp/qps/qpstest.grpc.pb.h"
 #include "test/cpp/qps/timer.h"
 #include "test/cpp/qps/client.h"
 
@@ -137,13 +137,7 @@ class AsyncUnaryClient GRPC_FINAL : public Client {
       cli_cqs_.emplace_back(new CompletionQueue);
     }
 
-    auto payload_size = config.payload_size();
-    auto check_done = [payload_size](grpc::Status s, SimpleResponse* response) {
-      GPR_ASSERT(s.IsOk() && (response->payload().type() ==
-                              grpc::testing::PayloadType::COMPRESSABLE) &&
-                 (response->payload().body().length() ==
-                  static_cast<size_t>(payload_size)));
-    };
+    auto check_done = [](grpc::Status s, SimpleResponse* response) {};
 
     int t = 0;
     for (int i = 0; i < config.outstanding_rpcs_per_channel(); i++) {
@@ -179,10 +173,14 @@ class AsyncUnaryClient GRPC_FINAL : public Client {
     }
   }
 
-  void ThreadFunc(Histogram* histogram, size_t thread_idx) GRPC_OVERRIDE {
+  bool ThreadFunc(Histogram* histogram, size_t thread_idx) GRPC_OVERRIDE {
     void* got_tag;
     bool ok;
-    cli_cqs_[thread_idx]->Next(&got_tag, &ok);
+    switch (cli_cqs_[thread_idx]->AsyncNext(&got_tag, &ok, std::chrono::system_clock::now() + std::chrono::seconds(1))) {
+      case CompletionQueue::SHUTDOWN: return false;
+      case CompletionQueue::TIMEOUT: return true;
+      case CompletionQueue::GOT_EVENT: break;
+    }
 
     ClientRpcContext* ctx = ClientRpcContext::detag(got_tag);
     if (ctx->RunNextState(ok, histogram) == false) {
@@ -191,6 +189,8 @@ class AsyncUnaryClient GRPC_FINAL : public Client {
       ctx->StartNewClone();
       delete ctx;
     }
+
+    return true;
   }
 
   std::vector<std::unique_ptr<CompletionQueue>> cli_cqs_;
@@ -270,13 +270,7 @@ class AsyncStreamingClient GRPC_FINAL : public Client {
       cli_cqs_.emplace_back(new CompletionQueue);
     }
 
-    auto payload_size = config.payload_size();
-    auto check_done = [payload_size](grpc::Status s, SimpleResponse *response) {
-      GPR_ASSERT(s.IsOk() && (response->payload().type() ==
-                              grpc::testing::PayloadType::COMPRESSABLE) &&
-                 (response->payload().body().length() ==
-                  static_cast<size_t>(payload_size)));
-    };
+    auto check_done = [](grpc::Status s, SimpleResponse* response) {};
 
     int t = 0;
     for (int i = 0; i < config.outstanding_rpcs_per_channel(); i++) {
@@ -313,10 +307,14 @@ class AsyncStreamingClient GRPC_FINAL : public Client {
     }
   }
 
-  void ThreadFunc(Histogram *histogram, size_t thread_idx) GRPC_OVERRIDE {
+  bool ThreadFunc(Histogram *histogram, size_t thread_idx) GRPC_OVERRIDE {
     void *got_tag;
     bool ok;
-    cli_cqs_[thread_idx]->Next(&got_tag, &ok);
+    switch (cli_cqs_[thread_idx]->AsyncNext(&got_tag, &ok, std::chrono::system_clock::now() + std::chrono::seconds(1))) {
+      case CompletionQueue::SHUTDOWN: return false;
+      case CompletionQueue::TIMEOUT: return true;
+      case CompletionQueue::GOT_EVENT: break;
+    }
 
     ClientRpcContext *ctx = ClientRpcContext::detag(got_tag);
     if (ctx->RunNextState(ok, histogram) == false) {
@@ -325,6 +323,8 @@ class AsyncStreamingClient GRPC_FINAL : public Client {
       ctx->StartNewClone();
       delete ctx;
     }
+
+    return true;
   }
 
   std::vector<std::unique_ptr<CompletionQueue>> cli_cqs_;
diff --git a/test/cpp/qps/client_sync.cc b/test/cpp/qps/client_sync.cc
index 77da1725ffa5c11d19043e9986ac6b5ade45965c..aea5a0fb27acd1cf75e0e10aff1ca47362df1199 100644
--- a/test/cpp/qps/client_sync.cc
+++ b/test/cpp/qps/client_sync.cc
@@ -55,7 +55,7 @@
 #include <gtest/gtest.h>
 #include "test/cpp/util/create_test_channel.h"
 #include "test/cpp/qps/client.h"
-#include "test/cpp/qps/qpstest.pb.h"
+#include "test/cpp/qps/qpstest.grpc.pb.h"
 #include "test/cpp/qps/histogram.h"
 #include "test/cpp/qps/timer.h"
 
@@ -83,13 +83,14 @@ class SynchronousUnaryClient GRPC_FINAL : public SynchronousClient {
     SynchronousClient(config) {StartThreads(num_threads_);}
   ~SynchronousUnaryClient() {}
   
-  void ThreadFunc(Histogram* histogram, size_t thread_idx) GRPC_OVERRIDE {
+  bool ThreadFunc(Histogram* histogram, size_t thread_idx) GRPC_OVERRIDE {
     auto* stub = channels_[thread_idx % channels_.size()].get_stub();
     double start = Timer::Now();
     grpc::ClientContext context;
     grpc::Status s =
         stub->UnaryCall(&context, request_, &responses_[thread_idx]);
     histogram->Add((Timer::Now() - start) * 1e9);
+    return s.IsOk();
   }
 };
 
@@ -111,11 +112,13 @@ class SynchronousStreamingClient GRPC_FINAL : public SynchronousClient {
     }
   }
 
-  void ThreadFunc(Histogram* histogram, size_t thread_idx) GRPC_OVERRIDE {
+  bool ThreadFunc(Histogram* histogram, size_t thread_idx) GRPC_OVERRIDE {
     double start = Timer::Now();
-    EXPECT_TRUE(stream_->Write(request_));
-    EXPECT_TRUE(stream_->Read(&responses_[thread_idx]));
-    histogram->Add((Timer::Now() - start) * 1e9);
+    if (stream_->Write(request_) && stream_->Read(&responses_[thread_idx])) {
+      histogram->Add((Timer::Now() - start) * 1e9);
+      return true;
+    }
+    return false;
   }
   private:
     grpc::ClientContext context_;
diff --git a/test/cpp/qps/driver.cc b/test/cpp/qps/driver.cc
index 64a53496aed12dcb99286e36e7f35dd2effbada5..f44883783dda0bffede233ea914d0d5eb400ad2f 100644
--- a/test/cpp/qps/driver.cc
+++ b/test/cpp/qps/driver.cc
@@ -74,7 +74,9 @@ static vector<string> get_hosts(const string& name) {
 ScenarioResult RunScenario(const ClientConfig& initial_client_config,
                            size_t num_clients,
                            const ServerConfig& server_config,
-                           size_t num_servers) {
+                           size_t num_servers,
+                           int warmup_seconds,
+                           int benchmark_seconds) {
   // ClientContext allocator (all are destroyed at scope exit)
   list<ClientContext> contexts;
   auto alloc_context = [&contexts]() {
@@ -146,7 +148,7 @@ ScenarioResult RunScenario(const ClientConfig& initial_client_config,
   // Let everything warmup
   gpr_log(GPR_INFO, "Warming up");
   gpr_timespec start = gpr_now();
-  gpr_sleep_until(gpr_time_add(start, gpr_time_from_seconds(5)));
+  gpr_sleep_until(gpr_time_add(start, gpr_time_from_seconds(warmup_seconds)));
 
   // Start a run
   gpr_log(GPR_INFO, "Starting");
@@ -171,7 +173,7 @@ ScenarioResult RunScenario(const ClientConfig& initial_client_config,
 
   // Wait some time
   gpr_log(GPR_INFO, "Running");
-  gpr_sleep_until(gpr_time_add(start, gpr_time_from_seconds(15)));
+  gpr_sleep_until(gpr_time_add(start, gpr_time_from_seconds(benchmark_seconds)));
 
   // Finish a run
   ScenarioResult result;
diff --git a/test/cpp/qps/driver.h b/test/cpp/qps/driver.h
index d87e80dc552a593a7b5230e34eaece33e1e19c04..b3a8bf8cc4a695f4ab7070d8844ae24471668b93 100644
--- a/test/cpp/qps/driver.h
+++ b/test/cpp/qps/driver.h
@@ -35,7 +35,7 @@
 #define TEST_QPS_DRIVER_H
 
 #include "test/cpp/qps/histogram.h"
-#include "test/cpp/qps/qpstest.pb.h"
+#include "test/cpp/qps/qpstest.grpc.pb.h"
 
 namespace grpc {
 namespace testing {
@@ -54,7 +54,10 @@ struct ScenarioResult {
 ScenarioResult RunScenario(const grpc::testing::ClientConfig& client_config,
                            size_t num_clients,
                            const grpc::testing::ServerConfig& server_config,
-                           size_t num_servers);
+                           size_t num_servers,
+                           int warmup_seconds,
+                           int benchmark_seconds);
+
 }  // namespace testing
 }  // namespace grpc
 
diff --git a/test/cpp/qps/histogram.h b/test/cpp/qps/histogram.h
index 7ba00e94c3947423e9f39ca721742437f9cee622..0547b7283a7203edf569993ba473c498e5b36245 100644
--- a/test/cpp/qps/histogram.h
+++ b/test/cpp/qps/histogram.h
@@ -35,7 +35,7 @@
 #define TEST_QPS_HISTOGRAM_H
 
 #include <grpc/support/histogram.h>
-#include "test/cpp/qps/qpstest.pb.h"
+#include "test/cpp/qps/qpstest.grpc.pb.h"
 
 namespace grpc {
 namespace testing {
@@ -50,10 +50,10 @@ class Histogram {
 
   void Merge(Histogram* h) { gpr_histogram_merge(impl_, h->impl_); }
   void Add(double value) { gpr_histogram_add(impl_, value); }
-  double Percentile(double pctile) {
+  double Percentile(double pctile) const {
     return gpr_histogram_percentile(impl_, pctile);
   }
-  double Count() { return gpr_histogram_count(impl_); }
+  double Count() const { return gpr_histogram_count(impl_); }
   void Swap(Histogram* other) { std::swap(impl_, other->impl_); }
   void FillProto(HistogramData* p) {
     size_t n;
diff --git a/test/cpp/qps/qps_driver.cc b/test/cpp/qps/qps_driver.cc
index f7aa8e2aba69e9fd6e2d4e32e1810749e976e9fc..220f826118f21f976ce5f7e6ca588b54af55a510 100644
--- a/test/cpp/qps/qps_driver.cc
+++ b/test/cpp/qps/qps_driver.cc
@@ -35,11 +35,14 @@
 #include <grpc/support/log.h>
 
 #include "test/cpp/qps/driver.h"
-#include "test/cpp/qps/stats.h"
+#include "test/cpp/qps/report.h"
 
 DEFINE_int32(num_clients, 1, "Number of client binaries");
 DEFINE_int32(num_servers, 1, "Number of server binaries");
 
+DEFINE_int32(warmup_seconds, 5, "Warmup time (in seconds)");
+DEFINE_int32(benchmark_seconds, 30, "Benchmark time (in seconds)");
+
 // Common config
 DEFINE_bool(enable_ssl, false, "Use SSL");
 DEFINE_string(rpc_type, "UNARY", "Type of RPC: UNARY or STREAMING");
@@ -62,7 +65,6 @@ using grpc::testing::ClientType;
 using grpc::testing::ServerType;
 using grpc::testing::RpcType;
 using grpc::testing::ResourceUsage;
-using grpc::testing::sum;
 
 // In some distros, gflags is in the namespace google, and in some others,
 // in gflags. This hack is enabling us to find both.
@@ -98,40 +100,13 @@ int main(int argc, char** argv) {
   server_config.set_threads(FLAGS_server_threads);
   server_config.set_enable_ssl(FLAGS_enable_ssl);
 
-  auto result = RunScenario(client_config, FLAGS_num_clients, server_config,
-                            FLAGS_num_servers);
-
-  gpr_log(GPR_INFO, "QPS: %.1f",
-          result.latencies.Count() /
-              average(result.client_resources,
-                      [](ResourceUsage u) { return u.wall_time; }));
-
-  gpr_log(GPR_INFO, "Latencies (50/95/99/99.9%%-ile): %.1f/%.1f/%.1f/%.1f us",
-          result.latencies.Percentile(50) / 1000,
-          result.latencies.Percentile(95) / 1000,
-          result.latencies.Percentile(99) / 1000,
-          result.latencies.Percentile(99.9) / 1000);
-
-  gpr_log(GPR_INFO, "Server system time: %.2f%%",
-          100.0 * sum(result.server_resources,
-                      [](ResourceUsage u) { return u.system_time; }) /
-              sum(result.server_resources,
-                  [](ResourceUsage u) { return u.wall_time; }));
-  gpr_log(GPR_INFO, "Server user time:   %.2f%%",
-          100.0 * sum(result.server_resources,
-                      [](ResourceUsage u) { return u.user_time; }) /
-              sum(result.server_resources,
-                  [](ResourceUsage u) { return u.wall_time; }));
-  gpr_log(GPR_INFO, "Client system time: %.2f%%",
-          100.0 * sum(result.client_resources,
-                      [](ResourceUsage u) { return u.system_time; }) /
-              sum(result.client_resources,
-                  [](ResourceUsage u) { return u.wall_time; }));
-  gpr_log(GPR_INFO, "Client user time:   %.2f%%",
-          100.0 * sum(result.client_resources,
-                      [](ResourceUsage u) { return u.user_time; }) /
-              sum(result.client_resources,
-                  [](ResourceUsage u) { return u.wall_time; }));
+  auto result = RunScenario(client_config, FLAGS_num_clients,
+                            server_config, FLAGS_num_servers,
+                            FLAGS_warmup_seconds, FLAGS_benchmark_seconds);
+
+  ReportQPSPerCore(result, server_config);
+  ReportLatency(result);
+  ReportTimes(result);
 
   grpc_shutdown();
   return 0;
diff --git a/test/cpp/qps/report.cc b/test/cpp/qps/report.cc
new file mode 100644
index 0000000000000000000000000000000000000000..29d88da344a23f0b6492fdba9f8e0183ef755a74
--- /dev/null
+++ b/test/cpp/qps/report.cc
@@ -0,0 +1,94 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "test/cpp/qps/report.h"
+
+#include <grpc/support/log.h>
+#include "test/cpp/qps/stats.h"
+
+namespace grpc {
+namespace testing {
+
+// QPS: XXX
+void ReportQPS(const ScenarioResult& result) {
+  gpr_log(GPR_INFO, "QPS: %.1f",
+          result.latencies.Count() /
+              average(result.client_resources,
+                      [](ResourceUsage u) { return u.wall_time; }));
+}
+
+// QPS: XXX (YYY/server core)
+void ReportQPSPerCore(const ScenarioResult& result, const ServerConfig& server_config) {
+  auto qps = 
+      result.latencies.Count() /
+      average(result.client_resources,
+          [](ResourceUsage u) { return u.wall_time; });
+
+  gpr_log(GPR_INFO, "QPS: %.1f (%.1f/server core)", qps, qps/server_config.threads());
+}
+
+// Latency (50/90/95/99/99.9%-ile): AA/BB/CC/DD/EE us
+void ReportLatency(const ScenarioResult& result) {
+  gpr_log(GPR_INFO, "Latencies (50/90/95/99/99.9%%-ile): %.1f/%.1f/%.1f/%.1f/%.1f us",
+          result.latencies.Percentile(50) / 1000,
+          result.latencies.Percentile(90) / 1000,
+          result.latencies.Percentile(95) / 1000,
+          result.latencies.Percentile(99) / 1000,
+          result.latencies.Percentile(99.9) / 1000);
+}
+
+void ReportTimes(const ScenarioResult& result) {
+  gpr_log(GPR_INFO, "Server system time: %.2f%%",
+          100.0 * sum(result.server_resources,
+                      [](ResourceUsage u) { return u.system_time; }) /
+              sum(result.server_resources,
+                  [](ResourceUsage u) { return u.wall_time; }));
+  gpr_log(GPR_INFO, "Server user time:   %.2f%%",
+          100.0 * sum(result.server_resources,
+                      [](ResourceUsage u) { return u.user_time; }) /
+              sum(result.server_resources,
+                  [](ResourceUsage u) { return u.wall_time; }));
+  gpr_log(GPR_INFO, "Client system time: %.2f%%",
+          100.0 * sum(result.client_resources,
+                      [](ResourceUsage u) { return u.system_time; }) /
+              sum(result.client_resources,
+                  [](ResourceUsage u) { return u.wall_time; }));
+  gpr_log(GPR_INFO, "Client user time:   %.2f%%",
+          100.0 * sum(result.client_resources,
+                      [](ResourceUsage u) { return u.user_time; }) /
+              sum(result.client_resources,
+                  [](ResourceUsage u) { return u.wall_time; }));
+}
+
+}  // namespace testing
+}  // namespace grpc
diff --git a/test/cpp/qps/report.h b/test/cpp/qps/report.h
new file mode 100644
index 0000000000000000000000000000000000000000..343e426ca4ac74ecd877d7d5010933ac9550bde9
--- /dev/null
+++ b/test/cpp/qps/report.h
@@ -0,0 +1,57 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef TEST_QPS_REPORT_H
+#define TEST_QPS_REPORT_H
+
+#include "test/cpp/qps/driver.h"
+
+namespace grpc {
+namespace testing {
+
+// QPS: XXX
+void ReportQPS(const ScenarioResult& result);
+// QPS: XXX (YYY/server core)
+void ReportQPSPerCore(const ScenarioResult& result, const ServerConfig& config);
+// Latency (50/90/95/99/99.9%-ile): AA/BB/CC/DD/EE us
+void ReportLatency(const ScenarioResult& result);
+// Server system time: XX%
+// Server user time: XX%
+// Client system time: XX%
+// Client user time: XX%
+void ReportTimes(const ScenarioResult& result);
+
+}  // namespace testing
+}  // namespace grpc
+
+#endif
diff --git a/test/cpp/qps/server.h b/test/cpp/qps/server.h
index ef71cb94d00a379e47ec1c9233105a24ad80b69d..68e01154101be95c3378f44568b150d9b5cbfafd 100644
--- a/test/cpp/qps/server.h
+++ b/test/cpp/qps/server.h
@@ -35,7 +35,7 @@
 #define TEST_QPS_SERVER_H
 
 #include "test/cpp/qps/timer.h"
-#include "test/cpp/qps/qpstest.pb.h"
+#include "test/cpp/qps/qpstest.grpc.pb.h"
 
 namespace grpc {
 namespace testing {
diff --git a/test/cpp/qps/server_async.cc b/test/cpp/qps/server_async.cc
index 65c170af8119607951cafea2786dfe22d8fd2d10..b19c443c82333647f0602e70231821c5ffd1c819 100644
--- a/test/cpp/qps/server_async.cc
+++ b/test/cpp/qps/server_async.cc
@@ -52,7 +52,7 @@
 #include <grpc++/stream.h>
 #include <gtest/gtest.h>
 #include "src/cpp/server/thread_pool.h"
-#include "test/cpp/qps/qpstest.pb.h"
+#include "test/cpp/qps/qpstest.grpc.pb.h"
 #include "test/cpp/qps/server.h"
 
 #include <grpc/grpc.h>
@@ -97,15 +97,15 @@ class AsyncQpsServerTest : public Server {
         bool ok;
         void* got_tag;
         while (srv_cq_.Next(&got_tag, &ok)) {
-	  ServerRpcContext* ctx = detag(got_tag);
-	  // The tag is a pointer to an RPC context to invoke
-	  if (ctx->RunNextState(ok) == false) {
-	    // this RPC context is done, so refresh it
+          ServerRpcContext* ctx = detag(got_tag);
+          // The tag is a pointer to an RPC context to invoke
+          if (ctx->RunNextState(ok) == false) {
+            // this RPC context is done, so refresh it
             std::lock_guard<std::mutex> g(shutdown_mutex_);
             if (!shutdown_) {
               ctx->Reset();
             }
-	  }
+          }
         }
         return;
       }));
@@ -175,8 +175,9 @@ class AsyncQpsServerTest : public Server {
    private:
     bool finisher(bool) { return false; }
     bool invoker(bool ok) {
-      if (!ok)
-	return false;
+      if (!ok) {
+        return false;
+      }
 
       ResponseType response;
 
@@ -230,8 +231,9 @@ class AsyncQpsServerTest : public Server {
 
    private:
     bool request_done(bool ok) {
-      if (!ok)
-	return false;
+      if (!ok) {
+        return false;
+      }
       stream_.Read(&req_, AsyncQpsServerTest::tag(this));
       next_state_ = &ServerRpcContextStreamingImpl::read_done;
       return true;
diff --git a/test/cpp/qps/server_sync.cc b/test/cpp/qps/server_sync.cc
index 996442990106b89c277c2d744d34d0c4de0e1644..2770233a7c09373688d6ae78f0f595d082aa0493 100644
--- a/test/cpp/qps/server_sync.cc
+++ b/test/cpp/qps/server_sync.cc
@@ -47,7 +47,7 @@
 #include <grpc++/status.h>
 #include <grpc++/stream.h>
 #include "src/cpp/server/thread_pool.h"
-#include "test/cpp/qps/qpstest.pb.h"
+#include "test/cpp/qps/qpstest.grpc.pb.h"
 #include "test/cpp/qps/server.h"
 #include "test/cpp/qps/timer.h"
 
diff --git a/test/cpp/qps/smoke_test.cc b/test/cpp/qps/smoke_test.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c9d321f133c43fdc8247c90e8ed65b701d68945e
--- /dev/null
+++ b/test/cpp/qps/smoke_test.cc
@@ -0,0 +1,149 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <grpc/support/log.h>
+
+#include "test/cpp/qps/driver.h"
+#include "test/cpp/qps/report.h"
+
+namespace grpc {
+namespace testing {
+
+static const int WARMUP = 5;
+static const int BENCHMARK = 10;
+
+static void RunSynchronousUnaryPingPong() {
+  gpr_log(GPR_INFO, "Running Synchronous Unary Ping Pong");
+
+  ClientConfig client_config;
+  client_config.set_client_type(SYNCHRONOUS_CLIENT);
+  client_config.set_enable_ssl(false);
+  client_config.set_outstanding_rpcs_per_channel(1);
+  client_config.set_client_channels(1);
+  client_config.set_payload_size(1);
+  client_config.set_rpc_type(UNARY);
+
+  ServerConfig server_config;
+  server_config.set_server_type(SYNCHRONOUS_SERVER);
+  server_config.set_enable_ssl(false);
+  server_config.set_threads(1);
+
+  auto result = RunScenario(client_config, 1, server_config, 1, WARMUP, BENCHMARK);
+
+  ReportQPS(result);
+  ReportLatency(result);
+}
+
+static void RunSynchronousStreamingPingPong() {
+  gpr_log(GPR_INFO, "Running Synchronous Streaming Ping Pong");
+
+  ClientConfig client_config;
+  client_config.set_client_type(SYNCHRONOUS_CLIENT);
+  client_config.set_enable_ssl(false);
+  client_config.set_outstanding_rpcs_per_channel(1);
+  client_config.set_client_channels(1);
+  client_config.set_payload_size(1);
+  client_config.set_rpc_type(STREAMING);
+
+  ServerConfig server_config;
+  server_config.set_server_type(SYNCHRONOUS_SERVER);
+  server_config.set_enable_ssl(false);
+  server_config.set_threads(1);
+
+  auto result = RunScenario(client_config, 1, server_config, 1, WARMUP, BENCHMARK);
+
+  ReportQPS(result);
+  ReportLatency(result);
+}
+
+static void RunAsyncUnaryPingPong() {
+  gpr_log(GPR_INFO, "Running Async Unary Ping Pong");
+
+  ClientConfig client_config;
+  client_config.set_client_type(ASYNC_CLIENT);
+  client_config.set_enable_ssl(false);
+  client_config.set_outstanding_rpcs_per_channel(1);
+  client_config.set_client_channels(1);
+  client_config.set_payload_size(1);
+  client_config.set_async_client_threads(1);
+  client_config.set_rpc_type(UNARY);
+
+  ServerConfig server_config;
+  server_config.set_server_type(ASYNC_SERVER);
+  server_config.set_enable_ssl(false);
+  server_config.set_threads(1);
+
+  auto result = RunScenario(client_config, 1, server_config, 1, WARMUP, BENCHMARK);
+
+  ReportQPS(result);
+  ReportLatency(result);
+}
+
+static void RunQPS() {
+  gpr_log(GPR_INFO, "Running QPS test");
+
+  ClientConfig client_config;
+  client_config.set_client_type(ASYNC_CLIENT);
+  client_config.set_enable_ssl(false);
+  client_config.set_outstanding_rpcs_per_channel(1000);
+  client_config.set_client_channels(8);
+  client_config.set_payload_size(1);
+  client_config.set_async_client_threads(8);
+  client_config.set_rpc_type(UNARY);
+
+  ServerConfig server_config;
+  server_config.set_server_type(ASYNC_SERVER);
+  server_config.set_enable_ssl(false);
+  server_config.set_threads(4);
+
+  auto result = RunScenario(client_config, 1, server_config, 1, WARMUP, BENCHMARK);
+
+  ReportQPSPerCore(result, server_config);
+  ReportLatency(result);
+}
+
+}  // namespace testing
+}  // namespace grpc
+
+int main(int argc, char** argv) {
+  grpc_init();
+
+  using namespace grpc::testing;
+  RunSynchronousStreamingPingPong();
+  RunSynchronousUnaryPingPong();
+  RunAsyncUnaryPingPong();
+  RunQPS();
+
+  grpc_shutdown();
+  return 0;
+}
diff --git a/test/cpp/qps/smoke_test.sh b/test/cpp/qps/smoke_test.sh
new file mode 100755
index 0000000000000000000000000000000000000000..ba7f0a4f27dd427bf38a3d9fe9a022fdc550c20d
--- /dev/null
+++ b/test/cpp/qps/smoke_test.sh
@@ -0,0 +1,28 @@
+#!/bin/sh
+
+# performs a single qps run with one client and one server
+
+set -ex
+
+cd $(dirname $0)/../../..
+
+killall qps_worker || true
+
+config=opt
+
+NUMCPUS=`python2.7 -c 'import multiprocessing; print multiprocessing.cpu_count()'`
+
+make CONFIG=$config qps_worker qps_smoke_test -j$NUMCPUS
+
+bins/$config/qps_worker -driver_port 10000 -server_port 10001 &
+PID1=$!
+bins/$config/qps_worker -driver_port 10010 -server_port 10011 &
+PID2=$!
+
+export QPS_WORKERS="localhost:10000,localhost:10010"
+
+bins/$config/qps_smoke_test $*
+
+kill -2 $PID1 $PID2
+wait
+
diff --git a/test/cpp/qps/worker.cc b/test/cpp/qps/worker.cc
index b6830cc055709b5d8255d69e86e2cd1787ce615b..101eb9f9694bc22e5e52cd4af4e161589c2b1ad6 100644
--- a/test/cpp/qps/worker.cc
+++ b/test/cpp/qps/worker.cc
@@ -55,7 +55,7 @@
 #include <grpc++/stream.h>
 #include "test/core/util/grpc_profiler.h"
 #include "test/cpp/util/create_test_channel.h"
-#include "test/cpp/qps/qpstest.pb.h"
+#include "test/cpp/qps/qpstest.grpc.pb.h"
 #include "test/cpp/qps/client.h"
 #include "test/cpp/qps/server.h"
 
diff --git a/test/cpp/util/cli_call_test.cc b/test/cpp/util/cli_call_test.cc
index 91fc40c31f05eb669d892a84c8bc2246538d64b9..32ef392cc4c0368b97562d64fb65d6d82a056c27 100644
--- a/test/cpp/util/cli_call_test.cc
+++ b/test/cpp/util/cli_call_test.cc
@@ -33,7 +33,7 @@
 
 #include "test/core/util/test_config.h"
 #include "test/cpp/util/cli_call.h"
-#include "test/cpp/util/echo.pb.h"
+#include "test/cpp/util/echo.grpc.pb.h"
 #include "src/cpp/server/thread_pool.h"
 #include <grpc++/channel_arguments.h>
 #include <grpc++/channel_interface.h>
diff --git a/third_party/openssl b/third_party/openssl
index 3df69d3aefde7671053d4e3c242b228e5d79c83f..4ac0329582829f5378d8078c8d314ad37db87736 160000
--- a/third_party/openssl
+++ b/third_party/openssl
@@ -1 +1 @@
-Subproject commit 3df69d3aefde7671053d4e3c242b228e5d79c83f
+Subproject commit 4ac0329582829f5378d8078c8d314ad37db87736
diff --git a/tools/buildgen/generate_projects.sh b/tools/buildgen/generate_projects.sh
index 7a12440db2c0b277a5ade6d8c7b131409953c2d5..45f08df38fecbb18491a4547a41dd1863bd56030 100755
--- a/tools/buildgen/generate_projects.sh
+++ b/tools/buildgen/generate_projects.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 # Copyright 2015, Google Inc.
 # All rights reserved.
 #
@@ -31,7 +31,7 @@
 
 set -e
 
-if [ "x$TEST" == "x" ] ; then
+if [ "x$TEST" = "x" ] ; then
   TEST=false
 fi
 
@@ -61,12 +61,12 @@ for dir in . ; do
     out=${out%.*}  # strip template extension
     json_files="build.json $end2end_test_build"
     data=`for i in $json_files; do echo -n "-d $i "; done`
-    if [ $TEST == true ] ; then
+    if [ "x$TEST" = "xtrue" ] ; then
       actual_out=$out
       out=`mktemp /tmp/gentXXXXXX`
     fi
     $mako_renderer $plugins $data -o $out $file
-    if [ $TEST == true ] ; then
+    if [ "x$TEST" = "xtrue" ] ; then
       diff -q $out $actual_out
       rm $out
     fi
diff --git a/tools/distpackages/build_deb_packages.sh b/tools/distpackages/build_deb_packages.sh
index 7dff8e37437abd36a56b96f95928e86235299cd7..0beb41ed0a5ae036302856f84f54d1d8516279fd 100755
--- a/tools/distpackages/build_deb_packages.sh
+++ b/tools/distpackages/build_deb_packages.sh
@@ -30,9 +30,13 @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 # Where to put resulting .deb packages.
+set -x
 deb_dest="/tmp/deb_out"
 mkdir -p $deb_dest
 
+# Where the grpc disto is
+grpc_root="/var/local/git/grpc"
+
 # Update version from default values if the file /version.txt exists
 #
 # - when present, /version.txt will added by the docker build.
@@ -41,7 +45,13 @@ if [ -f /version.txt ]; then
   pkg_version=$(cat /version.txt)
 fi
 version="${pkg_version}.0"
-echo "Target release => $pkg_version"
+release_tag="release-${pkg_version//./_}"
+echo "Target release => $pkg_version, will checkout tag $release_tag"
+
+# Switch grpc_root to the release tag
+pushd $grpc_root
+git checkout $release_tag || { echo "bad release tag ${release_tag}"; exit 1; }
+popd
 
 if [ -f /.dockerinit ]; then
   # We're in Docker where uname -p returns "unknown".
@@ -71,7 +81,9 @@ do
   if [ $pkg_name == "libgrpc" ]
   then
     # Copy shared libraries
-    (cd ../..; make install-shared_c prefix=$tmp_dir/$pkg_name/usr/lib)
+    pushd $grpc_root
+    make install-shared_c prefix=$tmp_dir/$pkg_name/usr/lib
+    popd
     mv $tmp_dir/$pkg_name/usr/lib/lib $arch_lib_dir
 
     # non-dev package should contain so.0 symlinks
@@ -84,7 +96,10 @@ do
   if [ $pkg_name == "libgrpc-dev" ]
   then
     # Copy headers and static libraries
-    (cd ../..; make install-headers_c install-static_c prefix=$tmp_dir/$pkg_name/usr/lib)
+    pushd $grpc_root
+    make install-headers_c install-static_c prefix=$tmp_dir/$pkg_name/usr/lib
+    popd
+
     mv $tmp_dir/$pkg_name/usr/lib/include $tmp_dir/$pkg_name/usr/include
     mv $tmp_dir/$pkg_name/usr/lib/lib $arch_lib_dir
 
diff --git a/tools/distpackages/templates/libgrpc/DEBIAN/control b/tools/distpackages/templates/libgrpc/DEBIAN/control
index 417a825827434a45e19bb43ba0be96f4a56fe1e9..5854b1f4a19b7ba6a1e2348bee0d32ba0a61ea3e 100644
--- a/tools/distpackages/templates/libgrpc/DEBIAN/control
+++ b/tools/distpackages/templates/libgrpc/DEBIAN/control
@@ -2,7 +2,8 @@ Package: libgrpc
 Version: 0.5.0
 Architecture: amd64
 Maintainer: Jan Tattermusch <jtattermusch@google.com>
-Depends: libc6
+Depends: libc6, openssl (1.0.2-1)
+Build-Depends-Indep: openssl (1.0.2-1)
 Section: libs
 Priority: optional
 Homepage: https://github.com/grpc/grpc
diff --git a/tools/distrib/python/submit.py b/tools/distrib/python/submit.py
new file mode 100755
index 0000000000000000000000000000000000000000..79ebb93e573d79e9725dbf4816126b192dee4c51
--- /dev/null
+++ b/tools/distrib/python/submit.py
@@ -0,0 +1,54 @@
+#!/usr/bin/env python
+
+import argparse
+import os
+import shutil
+import subprocess
+
+parser = argparse.ArgumentParser(
+    description='Submit the package to a PyPI repository.')
+parser.add_argument(
+    '--repository', '-r', metavar='r', type=str, default='pypi',
+    help='The repository to push the package to. '
+         'Ensure the value appears in your .pypirc file. '
+         'Defaults to "pypi".'
+)
+parser.add_argument(
+    '--identity', '-i', metavar='i', type=str,
+    help='GPG identity to sign the files with.'
+)
+parser.add_argument(
+    '--username', '-u', metavar='u', type=str,
+    help='Username to authenticate with the repository. Not needed if you have '
+         'configured your .pypirc to include your username.'
+)
+parser.add_argument(
+    '--password', '-p', metavar='p', type=str,
+    help='Password to authenticate with the repository. Not needed if you have '
+         'configured your .pypirc to include your password.'
+)
+args = parser.parse_args()
+
+# Move to the root directory of Python GRPC.
+pkgdir = os.path.join(os.path.dirname(os.path.abspath(__file__)),
+                      '../../../src/python/src')
+# Remove previous distributions; they somehow confuse twine.
+try:
+  shutil.rmtree(os.path.join(pkgdir, 'dist/'))
+except:
+  pass
+
+# Make the push.
+cmd = ['python', 'setup.py', 'sdist']
+subprocess.call(cmd, cwd=pkgdir)
+
+cmd = ['twine', 'upload', '-r', args.repository]
+if args.identity is not None:
+  cmd.extend(['-i', args.identity])
+if args.username is not None:
+  cmd.extend(['-u', args.username])
+if args.password is not None:
+  cmd.extend(['-p', args.password])
+cmd.append('dist/*')
+
+subprocess.call(cmd, cwd=pkgdir)
diff --git a/tools/dockerfile/grpc_build_deb/Dockerfile b/tools/dockerfile/grpc_build_deb/Dockerfile
index 24ffc7379cfcdab36d33d24b4af44d3e25366421..7f025b6712580ba2704b9fedede4d9e2aafe82e6 100644
--- a/tools/dockerfile/grpc_build_deb/Dockerfile
+++ b/tools/dockerfile/grpc_build_deb/Dockerfile
@@ -30,8 +30,17 @@
 # Dockerfile to build Debian packages for gRPC C core.
 FROM grpc/base
 
+# Add the file containing the gRPC version
+ADD version.txt version.txt
+
+# Add the update-to-date distpackages folder
+ADD distpackages distpackages
+
 # Install dependencies
-RUN apt-get update && apt-get install -y lintian
+RUN echo 'deb http://http.debian.net/debian experimental main contrib non-free' >> /etc/apt/sources.list
+RUN apt-get update \
+  && apt-get -t experimental install -y openssl=1.0.2-1 \
+  && apt-get install -y lintian
 
 # Get the source from GitHub
 RUN git clone https://github.com/grpc/grpc.git /var/local/git/grpc
@@ -39,4 +48,4 @@ RUN cd /var/local/git/grpc && \
   git pull --recurse-submodules && \
   git submodule update --init --recursive
 
-RUN /bin/bash -l -c 'cd /var/local/git/grpc/tools/distpackages && ./build_deb_packages.sh'
+RUN /bin/bash -l -c 'cd /distpackages && ./build_deb_packages.sh'
diff --git a/tools/dockerfile/grpc_build_deb/version.txt b/tools/dockerfile/grpc_build_deb/version.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a918a2aa18d5bec6a8bb93891a7a63c243111796
--- /dev/null
+++ b/tools/dockerfile/grpc_build_deb/version.txt
@@ -0,0 +1 @@
+0.6.0
diff --git a/tools/dockerfile/grpc_dist_proto/version.txt b/tools/dockerfile/grpc_dist_proto/version.txt
index 8f0916f768f0487bcf8d33827ce2c8dcecb645c1..a918a2aa18d5bec6a8bb93891a7a63c243111796 100644
--- a/tools/dockerfile/grpc_dist_proto/version.txt
+++ b/tools/dockerfile/grpc_dist_proto/version.txt
@@ -1 +1 @@
-0.5.0
+0.6.0
diff --git a/tools/dockerfile/grpc_python/Dockerfile b/tools/dockerfile/grpc_python/Dockerfile
index 62ef785a3184384a334de3bf50e73580ba1d7901..aa29685beee06e2a2ae076cf57385137a704b7a6 100644
--- a/tools/dockerfile/grpc_python/Dockerfile
+++ b/tools/dockerfile/grpc_python/Dockerfile
@@ -66,5 +66,8 @@ RUN cd /var/local/git/grpc \
 # Add a cacerts directory containing the Google root pem file, allowing the interop client to access the production test instance
 ADD cacerts cacerts
 
+# Add a service_account directory containing the auth creds file
+ADD service_account service_account
+
 # Specify the default command such that the interop server runs on its known testing port
 CMD ["/bin/bash", "-l", "-c", "python2.7 -m interop.server --use_tls --port 8050"]
diff --git a/tools/gce_setup/grpc_docker.sh b/tools/gce_setup/grpc_docker.sh
index 497112ce3995e5f70c7f270782c283f8c9f22059..c68903b816407503f2fc679b501f4018f925d53c 100755
--- a/tools/gce_setup/grpc_docker.sh
+++ b/tools/gce_setup/grpc_docker.sh
@@ -673,7 +673,7 @@ _grpc_build_proto_bins_args() {
 }
 
 # grpc_build_proto_bins
-# 
+#
 # - rebuilds the dist_proto docker image
 #   * doing this builds the protoc and the ruby, python and cpp bins statically
 #
@@ -693,11 +693,11 @@ grpc_build_proto_bins() {
   gce_has_instance $grpc_project $host || return 1;
   local project_opt="--project $grpc_project"
   local zone_opt="--zone $grpc_zone"
-  
+
   # rebuild the dist_proto image
   local label='dist_proto'
   grpc_update_image -- -h $host $label || return 1
- 
+
   # run a command to copy the generated archive to the docker host
   local docker_prefix='sudo docker run -v /tmp:/tmp/proto_bins_out'
   local tar_name='proto-bins*.tar.gz'
@@ -715,6 +715,63 @@ grpc_build_proto_bins() {
   gcloud compute copy-files $rmt_tar $local_copy $project_opt $zone_opt || return 1
 }
 
+_grpc_build_debs_args() {
+  [[ -n $1 ]] && {  # host
+    host=$1
+    shift
+  } || {
+    host='grpc-docker-builder'
+  }
+}
+
+# grpc_build_debs
+#
+# - rebuilds the build_debs
+#   * doing this builds a deb package for release debs
+#
+# - runs a docker command that copies the debs from the docker instance to its
+#   host
+# - copies the debs from the host to the local machine
+grpc_build_debs() {
+  _grpc_ensure_gcloud_ssh || return 1;
+
+  # declare vars local so that they don't pollute the shell environment
+  # where this func is used.
+  local grpc_zone grpc_project dry_run  # set by _grpc_set_project_and_zone
+  # set by _grpc_build_debs_args
+  local host
+
+  # set the project zone and check that all necessary args are provided
+  _grpc_set_project_and_zone -f _grpc_build_debs_args "$@" || return 1
+  gce_has_instance $grpc_project $host || return 1;
+  local project_opt="--project $grpc_project"
+  local zone_opt="--zone $grpc_zone"
+
+  # Update the remote distpackages_dir
+  local src_dist_dir='tools/distpackages'
+  local rmt_dist_dir="$host:~"
+  gcloud compute copy-files $src_dist_dir $rmt_dist_dir $project_opt $zone_opt || return 1
+
+  # rebuild the build_deb image
+  local label='build_deb'
+  grpc_update_image -- -h $host $label || return 1
+
+  # run a command to copy the debs from the docker instance to the host.
+  local docker_prefix='sudo docker run -v /tmp:/tmp/host_deb_out'
+  local cp_cmd="/bin/bash -c 'cp -v /tmp/deb_out/*.deb /tmp/host_deb_out'"
+  local cmd="$docker_prefix grpc/$label $cp_cmd"
+  local ssh_cmd="bash -l -c \"$cmd\""
+  echo "will run:"
+  echo "  $ssh_cmd"
+  echo "on $host"
+  gcloud compute $project_opt ssh $zone_opt $host --command "$cmd" || return 1
+
+  # copy the debs from host machine to the local one.
+  local rmt_debs="$host:/tmp/*.deb"
+  local local_copy="$(pwd)"
+  gcloud compute copy-files $rmt_debs $local_copy $project_opt $zone_opt || return 1
+}
+
 _grpc_launch_servers_args() {
   [[ -n $1 ]] && {  # host
     host=$1
@@ -984,6 +1041,35 @@ grpc_interop_gen_python_cmd() {
   echo $the_cmd
 }
 
+# constructs the full dockerized python service_account auth interop test cmd.
+#
+# call-seq:
+#   flags= .... # generic flags to include the command
+#   cmd=$($grpc_gen_test_cmd $flags)
+grpc_cloud_prod_auth_service_account_creds_gen_python_cmd() {
+  local cmd_prefix="sudo docker run grpc/python bin/bash -l -c";
+  local gfe_flags=$(_grpc_prod_gfe_flags)
+  local added_gfe_flags=$(_grpc_default_creds_test_flags)
+  local env_prefix="SSL_CERT_FILE=/cacerts/roots.pem"
+  env_prefix+=" GOOGLE_APPLICATION_CREDENTIALS=/service_account/stubbyCloudTestingTest-7dd63462c60c.json"
+  local the_cmd="$cmd_prefix '$env_prefix python -B -m interop.client --use_tls $gfe_flags $added_gfe_flags $@'"
+  echo $the_cmd
+}
+
+# constructs the full dockerized python gce auth interop test cmd.
+#
+# call-seq:
+#   flags= .... # generic flags to include the command
+#   cmd=$($grpc_gen_test_cmd $flags)
+grpc_cloud_prod_auth_compute_engine_creds_gen_python_cmd() {
+  local cmd_prefix="sudo docker run grpc/python bin/bash -l -c";
+  local gfe_flags=$(_grpc_prod_gfe_flags)
+  local added_gfe_flags=$(_grpc_gce_test_flags)
+  local env_prefix="SSL_CERT_FILE=/cacerts/roots.pem"
+  local the_cmd="$cmd_prefix '$env_prefix python -B -m interop.client --use_tls $gfe_flags $added_gfe_flags $@'"
+  echo $the_cmd
+}
+
 # constructs the full dockerized java interop test cmd.
 #
 # call-seq:
@@ -1310,5 +1396,3 @@ _grpc_default_creds_test_flags() {
 _grpc_gce_test_flags() {
   echo " --default_service_account=155450119199-r5aaqa2vqoa9g5mv2m6s3m1l293rlmel@developer.gserviceaccount.com --oauth_scope=https://www.googleapis.com/auth/xapi.zoo"
 }
-
-# TODO(grpc-team): add grpc_interop_gen_xxx_cmd for python
diff --git a/tools/gce_setup/interop_test_runner.sh b/tools/gce_setup/interop_test_runner.sh
index 7f0b5bab1a91c6d8d7cfd10fba5ff69737a2a2cb..1c6122e9ae15752e1497594672bf63727ab7e693 100755
--- a/tools/gce_setup/interop_test_runner.sh
+++ b/tools/gce_setup/interop_test_runner.sh
@@ -36,7 +36,7 @@ echo $result_file_name
 main() {
   source grpc_docker.sh
   test_cases=(large_unary empty_unary ping_pong client_streaming server_streaming cancel_after_begin cancel_after_first_response)
-  clients=(cxx java go ruby node python csharp_mono)
+  clients=(cxx java go ruby node python csharp_mono php)
   servers=(cxx java go ruby node python csharp_mono)
   for test_case in "${test_cases[@]}"
   do
diff --git a/tools/gce_setup/shared_startup_funcs.sh b/tools/gce_setup/shared_startup_funcs.sh
index e6eecc56db62de9e92aafb60eaeed2700449c3b4..c4a076757aab7673b7939790d2702630ddf459e1 100755
--- a/tools/gce_setup/shared_startup_funcs.sh
+++ b/tools/gce_setup/shared_startup_funcs.sh
@@ -434,6 +434,12 @@ grpc_dockerfile_install() {
     grpc_docker_sync_service_account $dockerfile_dir/service_account || return 1;
   }
 
+  # For deb builds, copy the distpackages folder into the docker directory so
+  # that it can be installed using ADD distpackages distpackages.
+  [[ $image_label == "grpc/build_deb" ]] && {
+    cp -vR ~/distpackages $dockerfile_dir
+  }
+
   # TODO(temiola): maybe make cache/no-cache a func option?
   sudo docker build $cache_opt -t $image_label $dockerfile_dir || {
     echo "$FUNCNAME:: build of $image_label <- $dockerfile_dir"
diff --git a/tools/run_tests/run_tests.py b/tools/run_tests/run_tests.py
index b2e936268934f199ea26e2d0fef9e5237293e79d..c279c3ecce4a1bee32e25ffd253a27f2b92cde41 100755
--- a/tools/run_tests/run_tests.py
+++ b/tools/run_tests/run_tests.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python2.7
+#!/usr/bin/env python
 # Copyright 2015, Google Inc.
 # All rights reserved.
 #
diff --git a/tools/run_tests/tests.json b/tools/run_tests/tests.json
index 3e304ee88a62612aef0f7726c47bdffe48737c05..520405b96af090f65f9d23736bf6c008523b871c 100644
--- a/tools/run_tests/tests.json
+++ b/tools/run_tests/tests.json
@@ -315,15 +315,6 @@
       "posix"
     ]
   }, 
-  {
-    "flaky": false, 
-    "language": "c", 
-    "name": "gpr_useful_test", 
-    "platforms": [
-      "windows", 
-      "posix"
-    ]
-  }, 
   {
     "flaky": false, 
     "language": "c", 
diff --git a/vsprojects/vs2010/Grpc.mak b/vsprojects/vs2010/Grpc.mak
index 203c78728789dd84f003373710ca9ae841f93caf..727aa37781697dfb28b57c838d84ee6038993094 100644
--- a/vsprojects/vs2010/Grpc.mak
+++ b/vsprojects/vs2010/Grpc.mak
@@ -53,13 +53,13 @@ grpc_test_util:
 $(OUT_DIR):
 	mkdir $(OUT_DIR)
 
-buildtests: alarm_heap_test.exe alarm_list_test.exe alarm_test.exe alpn_test.exe bin_encoder_test.exe census_hash_table_test.exe census_statistics_multiple_writers_circular_buffer_test.exe census_statistics_multiple_writers_test.exe census_statistics_performance_test.exe census_statistics_quick_test.exe census_statistics_small_log_test.exe census_stats_store_test.exe census_stub_test.exe census_trace_store_test.exe census_window_stats_test.exe chttp2_status_conversion_test.exe chttp2_stream_encoder_test.exe chttp2_stream_map_test.exe chttp2_transport_end2end_test.exe dualstack_socket_test.exe echo_test.exe fd_posix_test.exe fling_stream_test.exe fling_test.exe gpr_cancellable_test.exe gpr_cmdline_test.exe gpr_env_test.exe gpr_file_test.exe gpr_histogram_test.exe gpr_host_port_test.exe gpr_log_test.exe gpr_slice_buffer_test.exe gpr_slice_test.exe gpr_string_test.exe gpr_sync_test.exe gpr_thd_test.exe gpr_time_test.exe gpr_useful_test.exe grpc_base64_test.exe grpc_byte_buffer_reader_test.exe grpc_channel_stack_test.exe grpc_completion_queue_test.exe grpc_credentials_test.exe grpc_json_token_test.exe grpc_stream_op_test.exe hpack_parser_test.exe hpack_table_test.exe httpcli_format_request_test.exe httpcli_parser_test.exe httpcli_test.exe json_rewrite_test.exe json_test.exe lame_client_test.exe message_compress_test.exe metadata_buffer_test.exe multi_init_test.exe murmur_hash_test.exe no_server_test.exe poll_kick_posix_test.exe resolve_address_test.exe secure_endpoint_test.exe sockaddr_utils_test.exe tcp_client_posix_test.exe tcp_posix_test.exe tcp_server_posix_test.exe time_averaged_stats_test.exe time_test.exe timeout_encoding_test.exe transport_metadata_test.exe transport_security_test.exe 
+buildtests: alarm_heap_test.exe alarm_list_test.exe alarm_test.exe alpn_test.exe bin_encoder_test.exe census_hash_table_test.exe census_statistics_multiple_writers_circular_buffer_test.exe census_statistics_multiple_writers_test.exe census_statistics_performance_test.exe census_statistics_quick_test.exe census_statistics_small_log_test.exe census_stats_store_test.exe census_stub_test.exe census_trace_store_test.exe census_window_stats_test.exe chttp2_status_conversion_test.exe chttp2_stream_encoder_test.exe chttp2_stream_map_test.exe chttp2_transport_end2end_test.exe dualstack_socket_test.exe echo_test.exe fd_posix_test.exe fling_stream_test.exe fling_test.exe gpr_cancellable_test.exe gpr_cmdline_test.exe gpr_env_test.exe gpr_file_test.exe gpr_histogram_test.exe gpr_host_port_test.exe gpr_log_test.exe gpr_slice_buffer_test.exe gpr_slice_test.exe gpr_string_test.exe gpr_sync_test.exe gpr_thd_test.exe gpr_time_test.exe gpr_tls_test.exe gpr_useful_test.exe grpc_base64_test.exe grpc_byte_buffer_reader_test.exe grpc_channel_stack_test.exe grpc_completion_queue_test.exe grpc_credentials_test.exe grpc_json_token_test.exe grpc_stream_op_test.exe hpack_parser_test.exe hpack_table_test.exe httpcli_format_request_test.exe httpcli_parser_test.exe httpcli_test.exe json_rewrite_test.exe json_test.exe lame_client_test.exe message_compress_test.exe metadata_buffer_test.exe multi_init_test.exe murmur_hash_test.exe no_server_test.exe poll_kick_posix_test.exe resolve_address_test.exe secure_endpoint_test.exe sockaddr_utils_test.exe tcp_client_posix_test.exe tcp_posix_test.exe tcp_server_posix_test.exe time_averaged_stats_test.exe time_test.exe timeout_encoding_test.exe transport_metadata_test.exe transport_security_test.exe 
 	echo All tests built.
 
-test: alarm_heap_test alarm_list_test alarm_test alpn_test bin_encoder_test census_hash_table_test census_statistics_multiple_writers_circular_buffer_test census_statistics_multiple_writers_test census_statistics_performance_test census_statistics_quick_test census_statistics_small_log_test census_stats_store_test census_stub_test census_trace_store_test census_window_stats_test chttp2_status_conversion_test chttp2_stream_encoder_test chttp2_stream_map_test chttp2_transport_end2end_test dualstack_socket_test echo_test fd_posix_test fling_stream_test fling_test gpr_cancellable_test gpr_cmdline_test gpr_env_test gpr_file_test gpr_histogram_test gpr_host_port_test gpr_log_test gpr_slice_buffer_test gpr_slice_test gpr_string_test gpr_sync_test gpr_thd_test gpr_time_test gpr_useful_test grpc_base64_test grpc_byte_buffer_reader_test grpc_channel_stack_test grpc_completion_queue_test grpc_credentials_test grpc_json_token_test grpc_stream_op_test hpack_parser_test hpack_table_test httpcli_format_request_test httpcli_parser_test httpcli_test json_rewrite_test json_test lame_client_test message_compress_test metadata_buffer_test multi_init_test murmur_hash_test no_server_test poll_kick_posix_test resolve_address_test secure_endpoint_test sockaddr_utils_test tcp_client_posix_test tcp_posix_test tcp_server_posix_test time_averaged_stats_test time_test timeout_encoding_test transport_metadata_test transport_security_test 
+test: alarm_heap_test alarm_list_test alarm_test alpn_test bin_encoder_test census_hash_table_test census_statistics_multiple_writers_circular_buffer_test census_statistics_multiple_writers_test census_statistics_performance_test census_statistics_quick_test census_statistics_small_log_test census_stats_store_test census_stub_test census_trace_store_test census_window_stats_test chttp2_status_conversion_test chttp2_stream_encoder_test chttp2_stream_map_test chttp2_transport_end2end_test dualstack_socket_test echo_test fd_posix_test fling_stream_test fling_test gpr_cancellable_test gpr_cmdline_test gpr_env_test gpr_file_test gpr_histogram_test gpr_host_port_test gpr_log_test gpr_slice_buffer_test gpr_slice_test gpr_string_test gpr_sync_test gpr_thd_test gpr_time_test gpr_tls_test gpr_useful_test grpc_base64_test grpc_byte_buffer_reader_test grpc_channel_stack_test grpc_completion_queue_test grpc_credentials_test grpc_json_token_test grpc_stream_op_test hpack_parser_test hpack_table_test httpcli_format_request_test httpcli_parser_test httpcli_test json_rewrite_test json_test lame_client_test message_compress_test metadata_buffer_test multi_init_test murmur_hash_test no_server_test poll_kick_posix_test resolve_address_test secure_endpoint_test sockaddr_utils_test tcp_client_posix_test tcp_posix_test tcp_server_posix_test time_averaged_stats_test time_test timeout_encoding_test transport_metadata_test transport_security_test 
 	echo All tests ran.
 
-test_gpr: gpr_cancellable_test gpr_cmdline_test gpr_env_test gpr_file_test gpr_histogram_test gpr_host_port_test gpr_log_test gpr_slice_buffer_test gpr_slice_test gpr_string_test gpr_sync_test gpr_thd_test gpr_time_test gpr_useful_test 
+test_gpr: gpr_cancellable_test gpr_cmdline_test gpr_env_test gpr_file_test gpr_histogram_test gpr_host_port_test gpr_log_test gpr_slice_buffer_test gpr_slice_test gpr_string_test gpr_sync_test gpr_thd_test gpr_time_test gpr_tls_test gpr_useful_test 
 	echo All tests ran.
 
 alarm_heap_test.exe: grpc_test_util
@@ -398,6 +398,14 @@ gpr_time_test: gpr_time_test.exe
 	echo Running gpr_time_test
 	$(OUT_DIR)\gpr_time_test.exe
 
+gpr_tls_test.exe: grpc_test_util
+	echo Building gpr_tls_test
+	$(CC) $(CFLAGS) /Fo:$(OUT_DIR)\ ..\..\test\core\support\tls_test.c 
+	$(LINK) $(LFLAGS) /OUT:"$(OUT_DIR)\gpr_tls_test.exe" Debug\gpr_test_util.lib Debug\gpr.lib $(LIBS) $(OUT_DIR)\tls_test.obj 
+gpr_tls_test: gpr_tls_test.exe
+	echo Running gpr_tls_test
+	$(OUT_DIR)\gpr_tls_test.exe
+
 gpr_useful_test.exe: grpc_test_util
 	echo Building gpr_useful_test
 	$(CC) $(CFLAGS) /Fo:$(OUT_DIR)\ ..\..\test\core\support\useful_test.c 
diff --git a/vsprojects/vs2010/global.props b/vsprojects/vs2010/global.props
index e9b9d6cb85145df6f57df280c6d69caf26cd4cdb..ae44e18d4ea446cfd90a922b07d70a2ade2c04b8 100644
--- a/vsprojects/vs2010/global.props
+++ b/vsprojects/vs2010/global.props
@@ -6,7 +6,7 @@
   <ItemDefinitionGroup>
     <ClCompile>
       <AdditionalIncludeDirectories>$(SolutionDir)\..\..;$(SolutionDir)\..\..\include;$(SolutionDir)\..\..\third_party\zlib;$(SolutionDir)\..\third_party;$(SolutionDir)\..\..\third_party\openssl\inc32;$(SolutionDir)\..\..\third_party\protobuf\src</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>GRPC_OLD_CXX;_CRT_SECURE_NO_WARNINGS;_UNICODE;UNICODE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;_UNICODE;UNICODE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <WarningLevel>EnableAllWarnings</WarningLevel>
     </ClCompile>
   </ItemDefinitionGroup>
diff --git a/vsprojects/vs2010/gpr.vcxproj b/vsprojects/vs2010/gpr.vcxproj
index f50f87134c43669d2b5fd0c68aac0e0570e4484e..62ab6f3bd0932f7aec522ea919c84f685384a3d0 100644
--- a/vsprojects/vs2010/gpr.vcxproj
+++ b/vsprojects/vs2010/gpr.vcxproj
@@ -97,6 +97,10 @@
     <ClInclude Include="..\..\include\grpc\support\sync_win32.h" />
     <ClInclude Include="..\..\include\grpc\support\thd.h" />
     <ClInclude Include="..\..\include\grpc\support\time.h" />
+    <ClInclude Include="..\..\include\grpc\support\tls.h" />
+    <ClInclude Include="..\..\include\grpc\support\tls_gcc.h" />
+    <ClInclude Include="..\..\include\grpc\support\tls_msvc.h" />
+    <ClInclude Include="..\..\include\grpc\support\tls_pthread.h" />
     <ClInclude Include="..\..\include\grpc\support\useful.h" />
   </ItemGroup>
   <ItemGroup>
@@ -166,6 +170,8 @@
     </ClCompile>
     <ClCompile Include="..\..\src\core\support\sync_win32.c">
     </ClCompile>
+    <ClCompile Include="..\..\src\core\support\thd.c">
+    </ClCompile>
     <ClCompile Include="..\..\src\core\support\thd_posix.c">
     </ClCompile>
     <ClCompile Include="..\..\src\core\support\thd_win32.c">
diff --git a/vsprojects/vs2010/gpr.vcxproj.filters b/vsprojects/vs2010/gpr.vcxproj.filters
index dffaf1e62dffd2fdb1ef227affc52cbf379fa3f8..13fdb3fef84549df8a9da8b0b01db03702f757d2 100644
--- a/vsprojects/vs2010/gpr.vcxproj.filters
+++ b/vsprojects/vs2010/gpr.vcxproj.filters
@@ -88,6 +88,9 @@
     <ClCompile Include="..\..\src\core\support\sync_win32.c">
       <Filter>src\core\support</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\src\core\support\thd.c">
+      <Filter>src\core\support</Filter>
+    </ClCompile>
     <ClCompile Include="..\..\src\core\support\thd_posix.c">
       <Filter>src\core\support</Filter>
     </ClCompile>
@@ -168,6 +171,18 @@
     <ClInclude Include="..\..\include\grpc\support\time.h">
       <Filter>include\grpc\support</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\include\grpc\support\tls.h">
+      <Filter>include\grpc\support</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\include\grpc\support\tls_gcc.h">
+      <Filter>include\grpc\support</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\include\grpc\support\tls_msvc.h">
+      <Filter>include\grpc\support</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\include\grpc\support\tls_pthread.h">
+      <Filter>include\grpc\support</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\include\grpc\support\useful.h">
       <Filter>include\grpc\support</Filter>
     </ClInclude>
diff --git a/vsprojects/vs2010/grpc++.vcxproj b/vsprojects/vs2010/grpc++.vcxproj
index 0ee433163c88a9ab43920ede0b828cff1009d987..003355eabf8bd76a307cc165e939d6d0cedf6805 100644
--- a/vsprojects/vs2010/grpc++.vcxproj
+++ b/vsprojects/vs2010/grpc++.vcxproj
@@ -93,6 +93,12 @@
     <ClInclude Include="..\..\include\grpc++\impl\rpc_method.h" />
     <ClInclude Include="..\..\include\grpc++\impl\rpc_service_method.h" />
     <ClInclude Include="..\..\include\grpc++\impl\service_type.h" />
+    <ClInclude Include="..\..\include\grpc++\impl\sync.h" />
+    <ClInclude Include="..\..\include\grpc++\impl\sync_cxx11.h" />
+    <ClInclude Include="..\..\include\grpc++\impl\sync_no_cxx11.h" />
+    <ClInclude Include="..\..\include\grpc++\impl\thd.h" />
+    <ClInclude Include="..\..\include\grpc++\impl\thd_cxx11.h" />
+    <ClInclude Include="..\..\include\grpc++\impl\thd_no_cxx11.h" />
     <ClInclude Include="..\..\include\grpc++\server.h" />
     <ClInclude Include="..\..\include\grpc++\server_builder.h" />
     <ClInclude Include="..\..\include\grpc++\server_context.h" />
@@ -104,6 +110,8 @@
     <ClInclude Include="..\..\include\grpc++\thread_pool_interface.h" />
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="..\..\src\cpp\client\secure_credentials.h" />
+    <ClInclude Include="..\..\src\cpp\server\secure_server_credentials.h" />
     <ClInclude Include="..\..\src\cpp\client\channel.h" />
     <ClInclude Include="..\..\src\cpp\proto\proto_utils.h" />
     <ClInclude Include="..\..\src\cpp\server\thread_pool.h" />
diff --git a/vsprojects/vs2010/grpc++.vcxproj.filters b/vsprojects/vs2010/grpc++.vcxproj.filters
index ed93daee0441d19170e0c6cfb07c202089f107ee..6466a0fa26e523fe65de1185fb678edabc8e8432 100644
--- a/vsprojects/vs2010/grpc++.vcxproj.filters
+++ b/vsprojects/vs2010/grpc++.vcxproj.filters
@@ -132,6 +132,24 @@
     <ClInclude Include="..\..\include\grpc++\impl\service_type.h">
       <Filter>include\grpc++\impl</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\include\grpc++\impl\sync.h">
+      <Filter>include\grpc++\impl</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\include\grpc++\impl\sync_cxx11.h">
+      <Filter>include\grpc++\impl</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\include\grpc++\impl\sync_no_cxx11.h">
+      <Filter>include\grpc++\impl</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\include\grpc++\impl\thd.h">
+      <Filter>include\grpc++\impl</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\include\grpc++\impl\thd_cxx11.h">
+      <Filter>include\grpc++\impl</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\include\grpc++\impl\thd_no_cxx11.h">
+      <Filter>include\grpc++\impl</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\include\grpc++\server.h">
       <Filter>include\grpc++</Filter>
     </ClInclude>
@@ -161,6 +179,12 @@
     </ClInclude>
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="..\..\src\cpp\client\secure_credentials.h">
+      <Filter>src\cpp\client</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\src\cpp\server\secure_server_credentials.h">
+      <Filter>src\cpp\server</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\src\cpp\client\channel.h">
       <Filter>src\cpp\client</Filter>
     </ClInclude>
diff --git a/vsprojects/vs2013/Grpc.mak b/vsprojects/vs2013/Grpc.mak
index f211d3f6c0e6d602e774d104cce2dc7cc6a74a72..69e09b3bcdb4ec65ffa73284f9d359b4f60aa6ce 100644
--- a/vsprojects/vs2013/Grpc.mak
+++ b/vsprojects/vs2013/Grpc.mak
@@ -53,13 +53,6 @@ grpc_test_util:
 $(OUT_DIR):
 	mkdir $(OUT_DIR)
 
-buildtests: buildtests_c buildtests_cxx
-
-buildtests_c: alarm_heap_test.exe alarm_list_test.exe alarm_test.exe alpn_test.exe bin_encoder_test.exe census_hash_table_test.exe census_statistics_multiple_writers_circular_buffer_test.exe census_statistics_multiple_writers_test.exe census_statistics_performance_test.exe census_statistics_quick_test.exe census_statistics_small_log_test.exe census_stub_test.exe census_window_stats_test.exe chttp2_status_conversion_test.exe chttp2_stream_encoder_test.exe chttp2_stream_map_test.exe chttp2_transport_end2end_test.exe echo_client.exe echo_server.exe echo_test.exe fd_posix_test.exe fling_client.exe fling_server.exe fling_stream_test.exe fling_test.exe gpr_cancellable_test.exe gpr_cmdline_test.exe gpr_env_test.exe gpr_file_test.exe gpr_histogram_test.exe gpr_host_port_test.exe gpr_log_test.exe gpr_slice_buffer_test.exe gpr_slice_test.exe gpr_string_test.exe gpr_sync_test.exe gpr_thd_test.exe gpr_time_test.exe gpr_useful_test.exe grpc_base64_test.exe grpc_byte_buffer_reader_test.exe grpc_channel_stack_test.exe grpc_completion_queue_test.exe grpc_credentials_test.exe grpc_json_token_test.exe grpc_stream_op_test.exe hpack_parser_test.exe hpack_table_test.exe httpcli_format_request_test.exe httpcli_parser_test.exe httpcli_test.exe json_rewrite.exe json_rewrite_test.exe json_test.exe lame_client_test.exe message_compress_test.exe metadata_buffer_test.exe multi_init_test.exe murmur_hash_test.exe no_server_test.exe poll_kick_posix_test.exe resolve_address_test.exe secure_endpoint_test.exe sockaddr_utils_test.exe tcp_client_posix_test.exe tcp_posix_test.exe tcp_server_posix_test.exe time_averaged_stats_test.exe time_test.exe timeout_encoding_test.exe transport_metadata_test.exe transport_security_test.exe 
-	echo All tests built.
-
-buildtests_cxx: 
-	echo All tests built.
 
 alarm_heap_test.exe: grpc_test_util $(OUT_DIR)
 	echo Building alarm_heap_test
@@ -389,7 +382,19 @@ gpr_time_test: gpr_time_test.exe
 	echo Running gpr_time_test
 	$(OUT_DIR)\gpr_time_test.exe
 
+<<<<<<< HEAD
 gpr_useful_test.exe: grpc_test_util $(OUT_DIR)
+=======
+gpr_tls_test.exe: grpc_test_util
+	echo Building gpr_tls_test
+	$(CC) $(CFLAGS) /Fo:$(OUT_DIR)\ ..\..\test\core\support\tls_test.c 
+	$(LINK) $(LFLAGS) /OUT:"$(OUT_DIR)\gpr_tls_test.exe" Debug\gpr_test_util.lib Debug\gpr.lib $(LIBS) $(OUT_DIR)\tls_test.obj 
+gpr_tls_test: gpr_tls_test.exe
+	echo Running gpr_tls_test
+	$(OUT_DIR)\gpr_tls_test.exe
+
+gpr_useful_test.exe: grpc_test_util
+>>>>>>> fba547644c7e55ae222cb130cb289e19db43b449
 	echo Building gpr_useful_test
 	$(CC) $(CFLAGS) /Fo:$(OUT_DIR)\ ..\..\test\core\support\useful_test.c 
 	$(LINK) $(LFLAGS) /OUT:"$(OUT_DIR)\gpr_useful_test.exe" Debug\gpr_test_util.lib Debug\gpr.lib $(LIBS) $(OUT_DIR)\useful_test.obj 
diff --git a/vsprojects/vs2013/gpr.vcxproj b/vsprojects/vs2013/gpr.vcxproj
index 4b44cc645fd269ca8908f184131d086b8f450557..1876c0ff0a51145d9f9dfb05a1b617a622eb0a33 100644
--- a/vsprojects/vs2013/gpr.vcxproj
+++ b/vsprojects/vs2013/gpr.vcxproj
@@ -99,6 +99,10 @@
     <ClInclude Include="..\..\include\grpc\support\sync_win32.h" />
     <ClInclude Include="..\..\include\grpc\support\thd.h" />
     <ClInclude Include="..\..\include\grpc\support\time.h" />
+    <ClInclude Include="..\..\include\grpc\support\tls.h" />
+    <ClInclude Include="..\..\include\grpc\support\tls_gcc.h" />
+    <ClInclude Include="..\..\include\grpc\support\tls_msvc.h" />
+    <ClInclude Include="..\..\include\grpc\support\tls_pthread.h" />
     <ClInclude Include="..\..\include\grpc\support\useful.h" />
   </ItemGroup>
   <ItemGroup>
@@ -168,6 +172,8 @@
     </ClCompile>
     <ClCompile Include="..\..\src\core\support\sync_win32.c">
     </ClCompile>
+    <ClCompile Include="..\..\src\core\support\thd.c">
+    </ClCompile>
     <ClCompile Include="..\..\src\core\support\thd_posix.c">
     </ClCompile>
     <ClCompile Include="..\..\src\core\support\thd_win32.c">
diff --git a/vsprojects/vs2013/gpr.vcxproj.filters b/vsprojects/vs2013/gpr.vcxproj.filters
index dffaf1e62dffd2fdb1ef227affc52cbf379fa3f8..13fdb3fef84549df8a9da8b0b01db03702f757d2 100644
--- a/vsprojects/vs2013/gpr.vcxproj.filters
+++ b/vsprojects/vs2013/gpr.vcxproj.filters
@@ -88,6 +88,9 @@
     <ClCompile Include="..\..\src\core\support\sync_win32.c">
       <Filter>src\core\support</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\src\core\support\thd.c">
+      <Filter>src\core\support</Filter>
+    </ClCompile>
     <ClCompile Include="..\..\src\core\support\thd_posix.c">
       <Filter>src\core\support</Filter>
     </ClCompile>
@@ -168,6 +171,18 @@
     <ClInclude Include="..\..\include\grpc\support\time.h">
       <Filter>include\grpc\support</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\include\grpc\support\tls.h">
+      <Filter>include\grpc\support</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\include\grpc\support\tls_gcc.h">
+      <Filter>include\grpc\support</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\include\grpc\support\tls_msvc.h">
+      <Filter>include\grpc\support</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\include\grpc\support\tls_pthread.h">
+      <Filter>include\grpc\support</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\include\grpc\support\useful.h">
       <Filter>include\grpc\support</Filter>
     </ClInclude>
diff --git a/vsprojects/vs2013/grpc++.vcxproj b/vsprojects/vs2013/grpc++.vcxproj
index d545a949cb3090e326848d54b88fb7f46a2ddd03..dff588166b19712404712373a94c46f8e6fd4c67 100644
--- a/vsprojects/vs2013/grpc++.vcxproj
+++ b/vsprojects/vs2013/grpc++.vcxproj
@@ -95,6 +95,12 @@
     <ClInclude Include="..\..\include\grpc++\impl\rpc_method.h" />
     <ClInclude Include="..\..\include\grpc++\impl\rpc_service_method.h" />
     <ClInclude Include="..\..\include\grpc++\impl\service_type.h" />
+    <ClInclude Include="..\..\include\grpc++\impl\sync.h" />
+    <ClInclude Include="..\..\include\grpc++\impl\sync_cxx11.h" />
+    <ClInclude Include="..\..\include\grpc++\impl\sync_no_cxx11.h" />
+    <ClInclude Include="..\..\include\grpc++\impl\thd.h" />
+    <ClInclude Include="..\..\include\grpc++\impl\thd_cxx11.h" />
+    <ClInclude Include="..\..\include\grpc++\impl\thd_no_cxx11.h" />
     <ClInclude Include="..\..\include\grpc++\server.h" />
     <ClInclude Include="..\..\include\grpc++\server_builder.h" />
     <ClInclude Include="..\..\include\grpc++\server_context.h" />
@@ -106,6 +112,8 @@
     <ClInclude Include="..\..\include\grpc++\thread_pool_interface.h" />
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="..\..\src\cpp\client\secure_credentials.h" />
+    <ClInclude Include="..\..\src\cpp\server\secure_server_credentials.h" />
     <ClInclude Include="..\..\src\cpp\client\channel.h" />
     <ClInclude Include="..\..\src\cpp\proto\proto_utils.h" />
     <ClInclude Include="..\..\src\cpp\server\thread_pool.h" />
diff --git a/vsprojects/vs2013/grpc++.vcxproj.filters b/vsprojects/vs2013/grpc++.vcxproj.filters
index ed93daee0441d19170e0c6cfb07c202089f107ee..6466a0fa26e523fe65de1185fb678edabc8e8432 100644
--- a/vsprojects/vs2013/grpc++.vcxproj.filters
+++ b/vsprojects/vs2013/grpc++.vcxproj.filters
@@ -132,6 +132,24 @@
     <ClInclude Include="..\..\include\grpc++\impl\service_type.h">
       <Filter>include\grpc++\impl</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\include\grpc++\impl\sync.h">
+      <Filter>include\grpc++\impl</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\include\grpc++\impl\sync_cxx11.h">
+      <Filter>include\grpc++\impl</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\include\grpc++\impl\sync_no_cxx11.h">
+      <Filter>include\grpc++\impl</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\include\grpc++\impl\thd.h">
+      <Filter>include\grpc++\impl</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\include\grpc++\impl\thd_cxx11.h">
+      <Filter>include\grpc++\impl</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\include\grpc++\impl\thd_no_cxx11.h">
+      <Filter>include\grpc++\impl</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\include\grpc++\server.h">
       <Filter>include\grpc++</Filter>
     </ClInclude>
@@ -161,6 +179,12 @@
     </ClInclude>
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="..\..\src\cpp\client\secure_credentials.h">
+      <Filter>src\cpp\client</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\src\cpp\server\secure_server_credentials.h">
+      <Filter>src\cpp\server</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\src\cpp\client\channel.h">
       <Filter>src\cpp\client</Filter>
     </ClInclude>