49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_TIMER_HI_RES_TIMER_MANAGER_H_
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#define BASE_TIMER_HI_RES_TIMER_MANAGER_H_
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#include "base/base_export.h"
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#include "base/macros.h"
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#include "base/memory/ref_counted.h"
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#include "base/power_monitor/power_observer.h"
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#include "base/timer/timer.h"
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#include "build/build_config.h"
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namespace base {
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// Ensures that the Windows high resolution timer is only used
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// when not running on battery power.
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class BASE_EXPORT HighResolutionTimerManager : public base::PowerObserver {
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public:
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HighResolutionTimerManager();
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~HighResolutionTimerManager() override;
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// base::PowerObserver methods.
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void OnPowerStateChange(bool on_battery_power) override;
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void OnSuspend() override;
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void OnResume() override;
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// Returns true if the hi resolution clock could be used right now.
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bool hi_res_clock_available() const { return hi_res_clock_available_; }
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private:
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// Enable or disable the faster multimedia timer.
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void UseHiResClock(bool use);
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bool hi_res_clock_available_;
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#if defined(OS_WIN)
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// Timer for polling the high resolution timer usage.
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base::RepeatingTimer timer_;
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#endif
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DISALLOW_COPY_AND_ASSIGN(HighResolutionTimerManager);
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};
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} // namespace base
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#endif // BASE_TIMER_HI_RES_TIMER_MANAGER_H_
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