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- // 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.
- #ifndef BASE_TIMER_HI_RES_TIMER_MANAGER_H_
- #define BASE_TIMER_HI_RES_TIMER_MANAGER_H_
- #include "base/base_export.h"
- #include "base/power_monitor/power_observer.h"
- #include "base/timer/timer.h"
- #include "build/build_config.h"
- namespace base {
- // Ensures that the Windows high resolution timer is only used
- // when not running on battery power.
- class BASE_EXPORT HighResolutionTimerManager
- : public base::PowerSuspendObserver,
- public base::PowerStateObserver {
- public:
- HighResolutionTimerManager();
- HighResolutionTimerManager(const HighResolutionTimerManager&) = delete;
- HighResolutionTimerManager& operator=(const HighResolutionTimerManager&) =
- delete;
- ~HighResolutionTimerManager() override;
- // base::PowerStateObserver methods.
- void OnPowerStateChange(bool on_battery_power) override;
- // base::PowerSuspendObserver methods.
- void OnSuspend() override;
- void OnResume() override;
- // Returns true if the hi resolution clock could be used right now.
- bool hi_res_clock_available() const { return hi_res_clock_available_; }
- private:
- // Enable or disable the faster multimedia timer.
- void UseHiResClock(bool use);
- bool hi_res_clock_available_;
- #if BUILDFLAG(IS_WIN)
- // Timer for polling the high resolution timer usage.
- base::RepeatingTimer timer_;
- #endif
- };
- } // namespace base
- #endif // BASE_TIMER_HI_RES_TIMER_MANAGER_H_
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