1// Copyright (c) 2012 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 "base/threading/worker_pool.h"
6
7#include "base/bind.h"
8#include "base/callback.h"
9#include "base/debug/trace_event.h"
10#include "base/logging.h"
11#include "base/pending_task.h"
12#include "base/threading/thread_local.h"
13#include "base/tracked_objects.h"
14
15namespace base {
16
17namespace {
18
19base::LazyInstance<ThreadLocalBoolean>::Leaky
20    g_worker_pool_running_on_this_thread = LAZY_INSTANCE_INITIALIZER;
21
22DWORD CALLBACK WorkItemCallback(void* param) {
23  PendingTask* pending_task = static_cast<PendingTask*>(param);
24  TRACE_EVENT2("toplevel", "WorkItemCallback::Run",
25               "src_file", pending_task->posted_from.file_name(),
26               "src_func", pending_task->posted_from.function_name());
27
28  tracked_objects::ThreadData::PrepareForStartOfRun(pending_task->birth_tally);
29
30  g_worker_pool_running_on_this_thread.Get().Set(true);
31
32  tracked_objects::TaskStopwatch stopwatch;
33  pending_task->task.Run();
34  stopwatch.Stop();
35
36  g_worker_pool_running_on_this_thread.Get().Set(false);
37
38  tracked_objects::ThreadData::TallyRunOnWorkerThreadIfTracking(
39      pending_task->birth_tally,
40      tracked_objects::TrackedTime(pending_task->time_posted),
41      stopwatch);
42
43  delete pending_task;
44  return 0;
45}
46
47// Takes ownership of |pending_task|
48bool PostTaskInternal(PendingTask* pending_task, bool task_is_slow) {
49  ULONG flags = 0;
50  if (task_is_slow)
51    flags |= WT_EXECUTELONGFUNCTION;
52
53  if (!QueueUserWorkItem(WorkItemCallback, pending_task, flags)) {
54    DPLOG(ERROR) << "QueueUserWorkItem failed";
55    delete pending_task;
56    return false;
57  }
58
59  return true;
60}
61
62}  // namespace
63
64// static
65bool WorkerPool::PostTask(const tracked_objects::Location& from_here,
66                          const base::Closure& task, bool task_is_slow) {
67  PendingTask* pending_task = new PendingTask(from_here, task);
68  return PostTaskInternal(pending_task, task_is_slow);
69}
70
71// static
72bool WorkerPool::RunsTasksOnCurrentThread() {
73  return g_worker_pool_running_on_this_thread.Get().Get();
74}
75
76}  // namespace base
77