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// Copyright (c) 2009 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:
explicit DecrementCountDelegate(int* counter) : counter_(counter) {
}
virtual void OnWaitableEventSignaled(WaitableEvent* object) {
--(*counter_);
}
private:
int* counter_;
};
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_TRUE(watcher.GetWatchedEvent() == NULL);
QuitDelegate delegate;
watcher.StartWatching(&event, &delegate);
EXPECT_EQ(&event, watcher.GetWatchedEvent());
event.Signal();
MessageLoop::current()->Run();
EXPECT_TRUE(watcher.GetWatchedEvent() == NULL);
}
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);
}
}
}
void RunTest_DeleteUnder(MessageLoop::Type message_loop_type) {
// Delete the WaitableEvent out from under the Watcher. This is explictly
// allowed by the interface.
MessageLoop message_loop(message_loop_type);
{
WaitableEventWatcher watcher;
WaitableEvent* event = new WaitableEvent(false, false);
QuitDelegate delegate;
watcher.StartWatching(event, &delegate);
delete event;
}
}
} // namespace
//-----------------------------------------------------------------------------
TEST(WaitableEventWatcherTest, BasicSignal) {
RunTest_BasicSignal(MessageLoop::TYPE_DEFAULT);
RunTest_BasicSignal(MessageLoop::TYPE_IO);
RunTest_BasicSignal(MessageLoop::TYPE_UI);
}
TEST(WaitableEventWatcherTest, BasicCancel) {
RunTest_BasicCancel(MessageLoop::TYPE_DEFAULT);
RunTest_BasicCancel(MessageLoop::TYPE_IO);
RunTest_BasicCancel(MessageLoop::TYPE_UI);
}
TEST(WaitableEventWatcherTest, CancelAfterSet) {
RunTest_CancelAfterSet(MessageLoop::TYPE_DEFAULT);
RunTest_CancelAfterSet(MessageLoop::TYPE_IO);
RunTest_CancelAfterSet(MessageLoop::TYPE_UI);
}
TEST(WaitableEventWatcherTest, OutlivesMessageLoop) {
RunTest_OutlivesMessageLoop(MessageLoop::TYPE_DEFAULT);
RunTest_OutlivesMessageLoop(MessageLoop::TYPE_IO);
RunTest_OutlivesMessageLoop(MessageLoop::TYPE_UI);
}
TEST(WaitableEventWatcherTest, DeleteUnder) {
RunTest_DeleteUnder(MessageLoop::TYPE_DEFAULT);
RunTest_DeleteUnder(MessageLoop::TYPE_IO);
RunTest_DeleteUnder(MessageLoop::TYPE_UI);
}
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