base/threading/worker_pool_win.cc

   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
  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|
  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
  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
  72 bool WorkerPool::RunsTasksOnCurrentThread() {
  73   return g_worker_pool_running_on_this_thread.Get().Get();
  74 }
  75
  76 }  // namespace base