15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2011 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch#include "base/timer/hi_res_timer_manager.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#include "base/power_monitor/power_monitor.h" 8eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch#include "base/time/time.h" 9eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch 10eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdochnamespace base { 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)HighResolutionTimerManager::HighResolutionTimerManager() 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : hi_res_clock_available_(false) { 14c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) base::PowerMonitor* power_monitor = base::PowerMonitor::Get(); 15a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) DCHECK(power_monitor != NULL); 16c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) power_monitor->AddObserver(this); 17a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) UseHiResClock(!power_monitor->IsOnBatteryPower()); 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)HighResolutionTimerManager::~HighResolutionTimerManager() { 21c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) base::PowerMonitor::Get()->RemoveObserver(this); 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) UseHiResClock(false); 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void HighResolutionTimerManager::OnPowerStateChange(bool on_battery_power) { 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) UseHiResClock(!on_battery_power); 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void HighResolutionTimerManager::UseHiResClock(bool use) { 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (use == hi_res_clock_available_) 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hi_res_clock_available_ = use; 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::Time::EnableHighResolutionTimer(use); 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 35eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch 36eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch} // namespace base 37