1// Copyright (c) 2011 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#ifndef BASE_TIMER_HI_RES_TIMER_MANAGER_H_
6#define BASE_TIMER_HI_RES_TIMER_MANAGER_H_
7
8#include "base/base_export.h"
9#include "base/basictypes.h"
10#include "base/power_monitor/power_observer.h"
11
12namespace base {
13
14// Ensures that the Windows high resolution timer is only used
15// when not running on battery power.
16class BASE_EXPORT HighResolutionTimerManager : public base::PowerObserver {
17 public:
18  HighResolutionTimerManager();
19  virtual ~HighResolutionTimerManager();
20
21  // base::PowerObserver method.
22  virtual void OnPowerStateChange(bool on_battery_power) OVERRIDE;
23
24  // Returns true if the hi resolution clock could be used right now.
25  bool hi_res_clock_available() const { return hi_res_clock_available_; }
26
27 private:
28  // Enable or disable the faster multimedia timer.
29  void UseHiResClock(bool use);
30
31  bool hi_res_clock_available_;
32
33  DISALLOW_COPY_AND_ASSIGN(HighResolutionTimerManager);
34};
35
36}  // namespace base
37
38#endif  // BASE_TIMER_HI_RES_TIMER_MANAGER_H_
39