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 <memory> 8 #include <utility> 9 10 #include "base/power_monitor/power_monitor.h" 11 #include "base/power_monitor/power_monitor_device_source.h" 12 #include "base/test/scoped_task_environment.h" 13 #include "base/time/time.h" 14 #include "build/build_config.h" 15 #include "testing/gtest/include/gtest/gtest.h" 16 17 namespace base { 18 19 #if defined(OS_WIN) 20 TEST(HiResTimerManagerTest, ToggleOnOff) { 21 // The power monitor creates Window to receive power notifications from 22 // Windows, which makes this test flaky if you run while the machine 23 // goes in or out of AC power. 24 test::ScopedTaskEnvironment scoped_task_environment( 25 test::ScopedTaskEnvironment::MainThreadType::UI); 26 std::unique_ptr<base::PowerMonitorSource> power_monitor_source( 27 new base::PowerMonitorDeviceSource()); 28 std::unique_ptr<base::PowerMonitor> power_monitor( 29 new base::PowerMonitor(std::move(power_monitor_source))); 30 31 HighResolutionTimerManager manager; 32 // Simulate a on-AC power event to get to a known initial state. 33 manager.OnPowerStateChange(false); 34 35 // Loop a few times to test power toggling. 36 for (int times = 0; times != 3; ++times) { 37 // The manager has the high resolution clock enabled now. 38 EXPECT_TRUE(manager.hi_res_clock_available()); 39 // But the Time class has it off, because it hasn't been activated. 40 EXPECT_FALSE(base::Time::IsHighResolutionTimerInUse()); 41 42 // Activate the high resolution timer. 43 base::Time::ActivateHighResolutionTimer(true); 44 EXPECT_TRUE(base::Time::IsHighResolutionTimerInUse()); 45 46 // Simulate a on-battery power event. 47 manager.OnPowerStateChange(true); 48 EXPECT_FALSE(manager.hi_res_clock_available()); 49 EXPECT_FALSE(base::Time::IsHighResolutionTimerInUse()); 50 51 // Back to on-AC power. 52 manager.OnPowerStateChange(false); 53 EXPECT_TRUE(manager.hi_res_clock_available()); 54 EXPECT_TRUE(base::Time::IsHighResolutionTimerInUse()); 55 56 // De-activate the high resolution timer. 57 base::Time::ActivateHighResolutionTimer(false); 58 } 59 } 60 #endif // defined(OS_WIN) 61 62 } // namespace base 63
