| // Copyright (c) 2011 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/timer/hi_res_timer_manager.h" |
| |
| #include "base/power_monitor/power_monitor.h" |
| #include "base/time/time.h" |
| |
| namespace base { |
| |
| HighResolutionTimerManager::HighResolutionTimerManager() |
| : hi_res_clock_available_(false) { |
| base::PowerMonitor* power_monitor = base::PowerMonitor::Get(); |
| DCHECK(power_monitor != NULL); |
| power_monitor->AddObserver(this); |
| UseHiResClock(!power_monitor->IsOnBatteryPower()); |
| } |
| |
| HighResolutionTimerManager::~HighResolutionTimerManager() { |
| base::PowerMonitor::Get()->RemoveObserver(this); |
| UseHiResClock(false); |
| } |
| |
| void HighResolutionTimerManager::OnPowerStateChange(bool on_battery_power) { |
| UseHiResClock(!on_battery_power); |
| } |
| |
| void HighResolutionTimerManager::UseHiResClock(bool use) { |
| if (use == hi_res_clock_available_) |
| return; |
| hi_res_clock_available_ = use; |
| base::Time::EnableHighResolutionTimer(use); |
| } |
| |
| } // namespace base |