exec_ctx.c

/*
 *
 * Copyright 2015, Google Inc.
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 * modification, are permitted provided that the following conditions are
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 *
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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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#include "src/core/lib/iomgr/exec_ctx.h"

#include <grpc/support/log.h>
#include <grpc/support/sync.h>
#include <grpc/support/thd.h>

#include "src/core/lib/iomgr/combiner.h"
#include "src/core/lib/iomgr/workqueue.h"
#include "src/core/lib/profiling/timers.h"

bool grpc_exec_ctx_ready_to_finish(grpc_exec_ctx *exec_ctx) {
  if (!exec_ctx->cached_ready_to_finish) {
    exec_ctx->cached_ready_to_finish = exec_ctx->check_ready_to_finish(
        exec_ctx, exec_ctx->check_ready_to_finish_arg);
  }
  return exec_ctx->cached_ready_to_finish;
}

bool grpc_never_ready_to_finish(grpc_exec_ctx *exec_ctx, void *arg_ignored) {
  return false;
}

bool grpc_always_ready_to_finish(grpc_exec_ctx *exec_ctx, void *arg_ignored) {
  return true;
}

bool grpc_exec_ctx_flush(grpc_exec_ctx *exec_ctx) {
  bool did_something = 0;
  GPR_TIMER_BEGIN("grpc_exec_ctx_flush", 0);
  for (;;) {
    if (!grpc_closure_list_empty(exec_ctx->closure_list)) {
      grpc_closure *c = exec_ctx->closure_list.head;
      exec_ctx->closure_list.head = exec_ctx->closure_list.tail = NULL;
      while (c != NULL) {
        grpc_closure *next = c->next_data.next;
        grpc_error *error = c->error_data.error;
        did_something = true;
        c->cb(exec_ctx, c->cb_arg, error);
        GRPC_ERROR_UNREF(error);
        c = next;
      }
    } else if (!grpc_combiner_continue_exec_ctx(exec_ctx)) {
      break;
    }
  }
  GPR_ASSERT(exec_ctx->active_combiner == NULL);
  GPR_TIMER_END("grpc_exec_ctx_flush", 0);
  return did_something;
}

void grpc_exec_ctx_finish(grpc_exec_ctx *exec_ctx) {
  exec_ctx->cached_ready_to_finish = true;
  grpc_exec_ctx_flush(exec_ctx);
}

static void exec_ctx_run(grpc_exec_ctx *exec_ctx, grpc_closure *closure,
                         grpc_error *error) {
  closure->cb(exec_ctx, closure->cb_arg, error);
  GRPC_ERROR_UNREF(error);
}

static void exec_ctx_sched(grpc_exec_ctx *exec_ctx, grpc_closure *closure,
                           grpc_error *error) {
  grpc_closure_list_append(&exec_ctx->closure_list, closure, error);
}

void grpc_exec_ctx_global_init(void) {}
void grpc_exec_ctx_global_shutdown(void) {}

static const grpc_closure_scheduler_vtable exec_ctx_scheduler_vtable = {
    exec_ctx_run, exec_ctx_sched, "exec_ctx"};
static grpc_closure_scheduler exec_ctx_scheduler = {&exec_ctx_scheduler_vtable};
grpc_closure_scheduler *grpc_schedule_on_exec_ctx = &exec_ctx_scheduler;