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// Copyright 2011 The Chromium Authors
// 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 OnBatteryPowerStatusChange(
PowerStateObserver::BatteryPowerStatus battery_power_status) 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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