WaitableEvent

base/waitable_event_watcher_unittest.cc

Index: base/waitable_event_watcher_unittest.cc
diff --git a/base/waitable_event_watcher_unittest.cc b/base/waitable_event_watcher_unittest.cc
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+// 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/message_loop.h"
+#include "base/platform_thread.h"
+#include "base/waitable_event.h"
+#include "base/waitable_event_watcher.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using base::WaitableEvent;
+using base::WaitableEventWatcher;
+
+namespace {
+
+class QuitDelegate : public WaitableEventWatcher::Delegate {
+ public:
+  virtual void OnWaitableEventSignaled(WaitableEvent* event) {
+    MessageLoop::current()->Quit();
+  }
+};
+
+class DecrementCountDelegate : public WaitableEventWatcher::Delegate {
+ public:
+  DecrementCountDelegate(int* counter) : counter_(counter) {
+  }
+  virtual void OnWaitableEventSignaled(WaitableEvent* object) {
+    --(*counter_);
+  }
+ private:
+  int* counter_;
+};
+
+}  // namespace
+
+void RunTest_BasicSignal(MessageLoop::Type message_loop_type) {
+  MessageLoop message_loop(message_loop_type);
+
+  // A manual-reset event that is not yet signaled.
+  WaitableEvent event(true, false);
+
+  WaitableEventWatcher watcher;
+  EXPECT_EQ(NULL, watcher.GetWatchedObject());
+
+  QuitDelegate delegate;
+  watcher.StartWatching(&event, &delegate);
+  EXPECT_EQ(&event, watcher.GetWatchedObject());
+
+  event.Signal();
+
+  MessageLoop::current()->Run();
+
+  EXPECT_EQ(NULL, watcher.GetWatchedObject());
+}
+
+void RunTest_BasicCancel(MessageLoop::Type message_loop_type) {
+  MessageLoop message_loop(message_loop_type);
+
+  // A manual-reset event that is not yet signaled.
+  WaitableEvent event(true, false);
+
+  WaitableEventWatcher watcher;
+
+  QuitDelegate delegate;
+  watcher.StartWatching(&event, &delegate);
+
+  watcher.StopWatching();
+}
+
+void RunTest_CancelAfterSet(MessageLoop::Type message_loop_type) {
+  MessageLoop message_loop(message_loop_type);
+
+  // A manual-reset event that is not yet signaled.
+  WaitableEvent event(true, false);
+
+  WaitableEventWatcher watcher;
+
+  int counter = 1;
+  DecrementCountDelegate delegate(&counter);
+
+  watcher.StartWatching(&event, &delegate);
+
+  event.Signal();
+
+  // Let the background thread do its business
+  PlatformThread::Sleep(30);
+
+  watcher.StopWatching();
+
+  MessageLoop::current()->RunAllPending();
+
+  // Our delegate should not have fired.
+  EXPECT_EQ(1, counter);
+}
+
+void RunTest_OutlivesMessageLoop(MessageLoop::Type message_loop_type) {
+  // Simulate a MessageLoop that dies before an WaitableEventWatcher.  This
+  // ordinarily doesn't happen when people use the Thread class, but it can
+  // happen when people use the Singleton pattern or atexit.
+  WaitableEvent event(true, false);
+  {
+    WaitableEventWatcher watcher;
+    {
+      MessageLoop message_loop(message_loop_type);
+
+      QuitDelegate delegate;
+      watcher.StartWatching(&event, &delegate);
+    }
+  }
+}
+
+//-----------------------------------------------------------------------------
+
+TEST(ObjectWatcherTest, BasicSignal) {
+  RunTest_BasicSignal(MessageLoop::TYPE_DEFAULT);
+  RunTest_BasicSignal(MessageLoop::TYPE_IO);
+  RunTest_BasicSignal(MessageLoop::TYPE_UI);
+}
+
+TEST(ObjectWatcherTest, BasicCancel) {
+  RunTest_BasicCancel(MessageLoop::TYPE_DEFAULT);
+  RunTest_BasicCancel(MessageLoop::TYPE_IO);
+  RunTest_BasicCancel(MessageLoop::TYPE_UI);
+}
+
+TEST(ObjectWatcherTest, CancelAfterSet) {
+  RunTest_CancelAfterSet(MessageLoop::TYPE_DEFAULT);
+  RunTest_CancelAfterSet(MessageLoop::TYPE_IO);
+  RunTest_CancelAfterSet(MessageLoop::TYPE_UI);
+}
+
+TEST(ObjectWatcherTest, OutlivesMessageLoop) {
+  RunTest_OutlivesMessageLoop(MessageLoop::TYPE_DEFAULT);
+  RunTest_OutlivesMessageLoop(MessageLoop::TYPE_IO);
+  RunTest_OutlivesMessageLoop(MessageLoop::TYPE_UI);
+}