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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_HI_RES_TIMER_MANAGER_H_ | |
6 #define BASE_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 | |
12 // Ensures that the Windows high resolution timer is only used | |
13 // when not running on battery power. | |
14 class BASE_EXPORT HighResolutionTimerManager : public base::PowerObserver { | |
15 public: | |
16 HighResolutionTimerManager(); | |
17 virtual ~HighResolutionTimerManager(); | |
18 | |
19 // base::PowerObserver method. | |
20 virtual void OnPowerStateChange(bool on_battery_power) OVERRIDE; | |
21 | |
22 // Returns true if the hi resolution clock could be used right now. | |
23 bool hi_res_clock_available() const { return hi_res_clock_available_; } | |
24 | |
25 private: | |
26 // Enable or disable the faster multimedia timer. | |
27 void UseHiResClock(bool use); | |
28 | |
29 bool hi_res_clock_available_; | |
30 | |
31 DISALLOW_COPY_AND_ASSIGN(HighResolutionTimerManager); | |
32 }; | |
33 | |
34 #endif // BASE_HI_RES_TIMER_MANAGER_H_ | |
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