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
15 namespace base {
16
17 namespace {
18
19 base::LazyInstance<ThreadLocalBoolean>::Leaky
20 g_worker_pool_running_on_this_thread = LAZY_INSTANCE_INITIALIZER;
21
WorkItemCallback(void * param)22 DWORD 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|
PostTaskInternal(PendingTask * pending_task,bool task_is_slow)48 bool 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
PostTask(const tracked_objects::Location & from_here,const base::Closure & task,bool task_is_slow)65 bool 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
RunsTasksOnCurrentThread()72 bool WorkerPool::RunsTasksOnCurrentThread() {
73 return g_worker_pool_running_on_this_thread.Get().Get();
74 }
75
76 } // namespace base
77