// Copyright 2018 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/wall_clock_timer.h" #include #include "base/power_monitor/power_monitor.h" #include "base/time/clock.h" #include "base/time/default_clock.h" #include "base/time/default_tick_clock.h" #include "base/time/tick_clock.h" namespace base { WallClockTimer::WallClockTimer() = default; WallClockTimer::WallClockTimer(const Clock* clock, const TickClock* tick_clock) : timer_(tick_clock), clock_(clock ? clock : DefaultClock::GetInstance()) {} WallClockTimer::~WallClockTimer() { RemoveObserver(); } void WallClockTimer::Start(const Location& posted_from, Time desired_run_time, OnceClosure user_task) { user_task_ = std::move(user_task); posted_from_ = posted_from; desired_run_time_ = desired_run_time; AddObserver(); timer_.Start(posted_from_, desired_run_time_ - Now(), this, &WallClockTimer::RunUserTask); } void WallClockTimer::Stop() { timer_.Stop(); user_task_.Reset(); RemoveObserver(); } bool WallClockTimer::IsRunning() const { return timer_.IsRunning(); } void WallClockTimer::OnResume() { // This will actually restart timer with smaller delay timer_.Start(posted_from_, desired_run_time_ - Now(), this, &WallClockTimer::RunUserTask); } void WallClockTimer::AddObserver() { if (!observer_added_) { PowerMonitor::AddPowerSuspendObserver(this); observer_added_ = true; } } void WallClockTimer::RemoveObserver() { if (observer_added_) { PowerMonitor::RemovePowerSuspendObserver(this); observer_added_ = false; } } void WallClockTimer::RunUserTask() { DCHECK(user_task_); RemoveObserver(); std::exchange(user_task_, {}).Run(); } Time WallClockTimer::Now() const { return clock_->Now(); } } // namespace base