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71 lines
1.9 KiB
C++
71 lines
1.9 KiB
C++
// 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 <algorithm>
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#include "base/atomicops.h"
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#include "base/metrics/histogram_macros.h"
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#include "base/power_monitor/power_monitor.h"
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#include "base/task_scheduler/post_task.h"
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#include "base/time/time.h"
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namespace base {
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namespace {
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constexpr TimeDelta kUsageSampleInterval = TimeDelta::FromMinutes(10);
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void ReportHighResolutionTimerUsage() {
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UMA_HISTOGRAM_PERCENTAGE("Windows.HighResolutionTimerUsage",
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Time::GetHighResolutionTimerUsage());
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// Reset usage for the next interval.
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Time::ResetHighResolutionTimerUsage();
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}
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} // namespace
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HighResolutionTimerManager::HighResolutionTimerManager()
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: hi_res_clock_available_(false) {
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PowerMonitor* power_monitor = 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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// Start polling the high resolution timer usage.
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Time::ResetHighResolutionTimerUsage();
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timer_.Start(FROM_HERE, kUsageSampleInterval,
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Bind(&ReportHighResolutionTimerUsage));
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}
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HighResolutionTimerManager::~HighResolutionTimerManager() {
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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::OnSuspend() {
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// Stop polling the usage to avoid including the standby time.
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timer_.Stop();
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}
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void HighResolutionTimerManager::OnResume() {
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// Resume polling the usage.
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Time::ResetHighResolutionTimerUsage();
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timer_.Reset();
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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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Time::EnableHighResolutionTimer(use);
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}
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} // namespace base
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