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#ifndef BASE_TIMER_HI_RES_TIMER_MANAGER_H_ 6eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch#define BASE_TIMER_HI_RES_TIMER_MANAGER_H_ 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/base_export.h" 9c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#include "base/basictypes.h" 10c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#include "base/power_monitor/power_observer.h" 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 12eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdochnamespace base { 13eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Ensures that the Windows high resolution timer is only used 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// when not running on battery power. 16c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)class BASE_EXPORT HighResolutionTimerManager : public base::PowerObserver { 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HighResolutionTimerManager(); 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual ~HighResolutionTimerManager(); 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 21c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) // base::PowerObserver method. 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void OnPowerStateChange(bool on_battery_power) OVERRIDE; 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Returns true if the hi resolution clock could be used right now. 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool hi_res_clock_available() const { return hi_res_clock_available_; } 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) private: 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Enable or disable the faster multimedia timer. 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void UseHiResClock(bool use); 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool hi_res_clock_available_; 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DISALLOW_COPY_AND_ASSIGN(HighResolutionTimerManager); 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 36eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch} // namespace base 37eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch 38eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch#endif // BASE_TIMER_HI_RES_TIMER_MANAGER_H_ 39