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      1 // Copyright (c) 2011 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/synchronization/waitable_event_watcher.h"
      6 
      7 #include "base/compiler_specific.h"
      8 #include "base/synchronization/waitable_event.h"
      9 #include "base/win/object_watcher.h"
     10 
     11 namespace base {
     12 
     13 WaitableEventWatcher::ObjectWatcherHelper::ObjectWatcherHelper(
     14     WaitableEventWatcher* watcher)
     15     : watcher_(watcher) {
     16 };
     17 
     18 void WaitableEventWatcher::ObjectWatcherHelper::OnObjectSignaled(HANDLE h) {
     19   watcher_->OnObjectSignaled();
     20 }
     21 
     22 
     23 WaitableEventWatcher::WaitableEventWatcher()
     24     : ALLOW_THIS_IN_INITIALIZER_LIST(helper_(this)),
     25       event_(NULL),
     26       delegate_(NULL) {
     27 }
     28 
     29 WaitableEventWatcher::~WaitableEventWatcher() {
     30 }
     31 
     32 bool WaitableEventWatcher::StartWatching(WaitableEvent* event,
     33                                          Delegate* delegate) {
     34   delegate_ = delegate;
     35   event_ = event;
     36 
     37   return watcher_.StartWatching(event->handle(), &helper_);
     38 }
     39 
     40 void WaitableEventWatcher::StopWatching() {
     41   delegate_ = NULL;
     42   event_ = NULL;
     43   watcher_.StopWatching();
     44 }
     45 
     46 WaitableEvent* WaitableEventWatcher::GetWatchedEvent() {
     47   return event_;
     48 }
     49 
     50 void WaitableEventWatcher::OnObjectSignaled() {
     51   WaitableEvent* event = event_;
     52   Delegate* delegate = delegate_;
     53   event_ = NULL;
     54   delegate_ = NULL;
     55   DCHECK(event);
     56 
     57   delegate->OnWaitableEventSignaled(event);
     58 }
     59 
     60 }  // namespace base
     61