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::WaitableEventWatcher() 14 : event_(NULL) { 15 } 16 17 WaitableEventWatcher::~WaitableEventWatcher() { 18 } 19 20 bool WaitableEventWatcher::StartWatching( 21 WaitableEvent* event, 22 const EventCallback& callback) { 23 callback_ = callback; 24 event_ = event; 25 return watcher_.StartWatching(event->handle(), this); 26 } 27 28 void WaitableEventWatcher::StopWatching() { 29 callback_.Reset(); 30 event_ = NULL; 31 watcher_.StopWatching(); 32 } 33 34 WaitableEvent* WaitableEventWatcher::GetWatchedEvent() { 35 return event_; 36 } 37 38 void WaitableEventWatcher::OnObjectSignaled(HANDLE h) { 39 WaitableEvent* event = event_; 40 EventCallback callback = callback_; 41 event_ = NULL; 42 callback_.Reset(); 43 DCHECK(event); 44 45 callback.Run(event); 46 } 47 48 } // namespace base 49
