1// Copyright (c) 2012 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/timer/hi_res_timer_manager.h" 6 7#include "base/memory/scoped_ptr.h" 8#include "base/message_loop/message_loop.h" 9#include "base/power_monitor/power_monitor.h" 10#include "base/power_monitor/power_monitor_device_source.h" 11#include "base/time/time.h" 12#include "testing/gtest/include/gtest/gtest.h" 13 14namespace base { 15 16#if defined(OS_WIN) 17TEST(HiResTimerManagerTest, ToggleOnOff) { 18 // The power monitor creates Window to receive power notifications from 19 // Windows, which makes this test flaky if you run while the machine 20 // goes in or out of AC power. 21 base::MessageLoop loop(base::MessageLoop::TYPE_UI); 22 scoped_ptr<base::PowerMonitorSource> power_monitor_source( 23 new base::PowerMonitorDeviceSource()); 24 scoped_ptr<base::PowerMonitor> power_monitor( 25 new base::PowerMonitor(power_monitor_source.Pass())); 26 27 HighResolutionTimerManager manager; 28 // Simulate a on-AC power event to get to a known initial state. 29 manager.OnPowerStateChange(false); 30 31 // Loop a few times to test power toggling. 32 for (int times = 0; times != 3; ++times) { 33 // The manager has the high resolution clock enabled now. 34 EXPECT_TRUE(manager.hi_res_clock_available()); 35 // But the Time class has it off, because it hasn't been activated. 36 EXPECT_FALSE(base::Time::IsHighResolutionTimerInUse()); 37 38 // Activate the high resolution timer. 39 base::Time::ActivateHighResolutionTimer(true); 40 EXPECT_TRUE(base::Time::IsHighResolutionTimerInUse()); 41 42 // Simulate a on-battery power event. 43 manager.OnPowerStateChange(true); 44 EXPECT_FALSE(manager.hi_res_clock_available()); 45 EXPECT_FALSE(base::Time::IsHighResolutionTimerInUse()); 46 47 // Back to on-AC power. 48 manager.OnPowerStateChange(false); 49 EXPECT_TRUE(manager.hi_res_clock_available()); 50 EXPECT_TRUE(base::Time::IsHighResolutionTimerInUse()); 51 52 // De-activate the high resolution timer. 53 base::Time::ActivateHighResolutionTimer(false); 54 } 55} 56#endif // defined(OS_WIN) 57 58} // namespace base 59