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