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 11namespace base { 12 13WaitableEventWatcher::ObjectWatcherHelper::ObjectWatcherHelper( 14 WaitableEventWatcher* watcher) 15 : watcher_(watcher) { 16}; 17 18void WaitableEventWatcher::ObjectWatcherHelper::OnObjectSignaled(HANDLE h) { 19 watcher_->OnObjectSignaled(); 20} 21 22 23WaitableEventWatcher::WaitableEventWatcher() 24 : ALLOW_THIS_IN_INITIALIZER_LIST(helper_(this)), 25 event_(NULL), 26 delegate_(NULL) { 27} 28 29WaitableEventWatcher::~WaitableEventWatcher() { 30} 31 32bool WaitableEventWatcher::StartWatching(WaitableEvent* event, 33 Delegate* delegate) { 34 delegate_ = delegate; 35 event_ = event; 36 37 return watcher_.StartWatching(event->handle(), &helper_); 38} 39 40void WaitableEventWatcher::StopWatching() { 41 delegate_ = NULL; 42 event_ = NULL; 43 watcher_.StopWatching(); 44} 45 46WaitableEvent* WaitableEventWatcher::GetWatchedEvent() { 47 return event_; 48} 49 50void 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