waitable_event_watcher_win.cc revision 3f50c38dc070f4bb515c1b64450dae14f316474e 
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