37 lines
1.0 KiB
C++
37 lines
1.0 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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#include "base/timer/hi_res_timer_manager.h"
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#include "base/power_monitor/power_monitor.h"
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#include "base/time/time.h"
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namespace base {
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HighResolutionTimerManager::HighResolutionTimerManager()
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: hi_res_clock_available_(false) {
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base::PowerMonitor* power_monitor = base::PowerMonitor::Get();
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DCHECK(power_monitor != NULL);
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power_monitor->AddObserver(this);
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UseHiResClock(!power_monitor->IsOnBatteryPower());
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}
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HighResolutionTimerManager::~HighResolutionTimerManager() {
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base::PowerMonitor::Get()->RemoveObserver(this);
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UseHiResClock(false);
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}
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void HighResolutionTimerManager::OnPowerStateChange(bool on_battery_power) {
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UseHiResClock(!on_battery_power);
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}
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void HighResolutionTimerManager::UseHiResClock(bool use) {
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if (use == hi_res_clock_available_)
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return;
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hi_res_clock_available_ = use;
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base::Time::EnableHighResolutionTimer(use);
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}
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} // namespace base
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