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/*
* Copyright 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "OneShotTimer.h"
#include <chrono>
#include <sstream>
#include <thread>
namespace android {
namespace scheduler {
OneShotTimer::OneShotTimer(const Interval& interval, const ResetCallback& resetCallback,
const TimeoutCallback& timeoutCallback)
: mInterval(interval), mResetCallback(resetCallback), mTimeoutCallback(timeoutCallback) {}
OneShotTimer::~OneShotTimer() {
stop();
}
void OneShotTimer::start() {
{
std::lock_guard<std::mutex> lock(mMutex);
mState = TimerState::RESET;
}
mThread = std::thread(&OneShotTimer::loop, this);
}
void OneShotTimer::stop() {
{
std::lock_guard<std::mutex> lock(mMutex);
mState = TimerState::STOPPED;
}
mCondition.notify_all();
if (mThread.joinable()) {
mThread.join();
}
}
void OneShotTimer::loop() {
while (true) {
bool triggerReset = false;
bool triggerTimeout = false;
{
std::lock_guard<std::mutex> lock(mMutex);
if (mState == TimerState::STOPPED) {
break;
}
if (mState == TimerState::IDLE) {
mCondition.wait(mMutex);
continue;
}
if (mState == TimerState::RESET) {
triggerReset = true;
}
}
if (triggerReset && mResetCallback) {
mResetCallback();
}
{ // lock the mutex again. someone might have called stop meanwhile
std::lock_guard<std::mutex> lock(mMutex);
if (mState == TimerState::STOPPED) {
break;
}
auto triggerTime = std::chrono::steady_clock::now() + mInterval;
mState = TimerState::WAITING;
while (mState == TimerState::WAITING) {
constexpr auto zero = std::chrono::steady_clock::duration::zero();
auto waitTime = triggerTime - std::chrono::steady_clock::now();
if (waitTime > zero) mCondition.wait_for(mMutex, waitTime);
if (mState == TimerState::RESET) {
triggerTime = std::chrono::steady_clock::now() + mInterval;
mState = TimerState::WAITING;
} else if (mState == TimerState::WAITING &&
(triggerTime - std::chrono::steady_clock::now()) <= zero) {
triggerTimeout = true;
mState = TimerState::IDLE;
}
}
}
if (triggerTimeout && mTimeoutCallback) {
mTimeoutCallback();
}
}
}
void OneShotTimer::reset() {
{
std::lock_guard<std::mutex> lock(mMutex);
mState = TimerState::RESET;
}
mCondition.notify_all();
}
std::string OneShotTimer::dump() const {
std::ostringstream stream;
stream << mInterval.count() << " ms";
return stream.str();
}
} // namespace scheduler
} // namespace android
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