WaitableEvent

base/waitable_event_watcher_win.cc

+// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/waitable_event_watcher.h"
+
+#include "base/compiler_specific.h"
+#include "base/object_watcher.h"
+#include "base/waitable_event.h"
+
+namespace base {
+
+WaitableEventWatcher::ObjectWatcherHelper::ObjectWatcherHelper(
+    WaitableEventWatcher* watcher)
+    : watcher_(watcher) {
+};
+
+void WaitableEventWatcher::ObjectWatcherHelper::OnObjectSignaled(HANDLE h) {
+  watcher_->OnObjectSignaled();
+}
+
+
+WaitableEventWatcher::WaitableEventWatcher()
+    : event_(NULL),
+      ALLOW_THIS_IN_INITIALIZER_LIST(helper_(this)),
+      delegate_(NULL) {
+}
+
+WaitableEventWatcher::~WaitableEventWatcher() {
+}
+
+bool WaitableEventWatcher::StartWatching(WaitableEvent* event,
+                                         Delegate* delegate) {
+  delegate_ = delegate;
+  event_ = event;
+
+  return watcher_.StartWatching(event->handle(), &helper_);
+}
+
+void WaitableEventWatcher::StopWatching() {
+  delegate_ = NULL;
+  event_ = NULL;
+  watcher_.StopWatching();
+}
+
+WaitableEvent* WaitableEventWatcher::GetWatchedEvent() {
+  return event_;
+}
+
+void WaitableEventWatcher::OnObjectSignaled() {
+  WaitableEvent* event = event_;
+  Delegate* delegate = delegate_;
+  event_ = NULL;
+  delegate_ = NULL;
+  DCHECK(event);
+
+  delegate->OnWaitableEventSignaled(event);
+}
+
+}  // namespace base