content/renderer/scheduler/single_thread_idle_task_runner.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/renderer/scheduler/single_thread_idle_task_runner.h"
   6
   7 #include "base/location.h"
   8 #include "base/trace_event/trace_event.h"
   9
  10 namespace content {
  11
  12 SingleThreadIdleTaskRunner::SingleThreadIdleTaskRunner(
  13     scoped_refptr<base::SingleThreadTaskRunner> task_runner,
  14     base::Callback<void(base::TimeTicks*)> deadline_supplier)
  15     : task_runner_(task_runner), deadline_supplier_(deadline_supplier) {
  16 }
  17
  18 SingleThreadIdleTaskRunner::~SingleThreadIdleTaskRunner() {
  19 }
  20
  21 bool SingleThreadIdleTaskRunner::RunsTasksOnCurrentThread() const {
  22   return task_runner_->RunsTasksOnCurrentThread();
  23 }
  24
  25 void SingleThreadIdleTaskRunner::PostIdleTask(
  26     const tracked_objects::Location& from_here,
  27     const IdleTask& idle_task) {
  28   task_runner_->PostTask(
  29       from_here,
  30       base::Bind(&SingleThreadIdleTaskRunner::RunTask, this, idle_task));
  31 }
  32
  33 void SingleThreadIdleTaskRunner::RunTask(IdleTask idle_task) {
  34   base::TimeTicks deadline;
  35   deadline_supplier_.Run(&deadline);
  36   TRACE_EVENT1("renderer.scheduler",
  37                "SingleThreadIdleTaskRunner::RunTask", "allotted_time_ms",
  38                (deadline - base::TimeTicks::Now()).InMillisecondsF());
  39   idle_task.Run(deadline);
  40   bool is_tracing;
  41   TRACE_EVENT_CATEGORY_GROUP_ENABLED("renderer.scheduler", &is_tracing);
  42   if (is_tracing && base::TimeTicks::Now() > deadline) {
  43     TRACE_EVENT_INSTANT0("renderer.scheduler",
  44                          "SingleThreadIdleTaskRunner::DidOverrunDeadline",
  45                          TRACE_EVENT_SCOPE_THREAD);
  46   }
  47 }
  48
  49 }  // namespace content