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104 lines
3.2 KiB
104 lines
3.2 KiB
/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <android-base/thread_annotations.h>
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#include <chrono>
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#include <map>
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#include <mutex>
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#include <thread>
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namespace android::mediametrics {
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class TimedAction {
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public:
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TimedAction() : mThread{[this](){threadLoop();}} {}
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~TimedAction() {
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quit();
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}
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// TODO: return a handle for cancelling the action?
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template <typename T> // T is in units of std::chrono::duration.
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void postIn(const T& time, std::function<void()> f) {
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postAt(std::chrono::steady_clock::now() + time, f);
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}
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template <typename T> // T is in units of std::chrono::time_point
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void postAt(const T& targetTime, std::function<void()> f) {
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std::lock_guard l(mLock);
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if (mQuit) return;
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if (mMap.empty() || targetTime < mMap.begin()->first) {
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mMap.emplace_hint(mMap.begin(), targetTime, std::move(f));
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mCondition.notify_one();
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} else {
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mMap.emplace(targetTime, std::move(f));
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}
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}
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void clear() {
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std::lock_guard l(mLock);
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mMap.clear();
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}
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void quit() {
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{
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std::lock_guard l(mLock);
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if (mQuit) return;
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mQuit = true;
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mMap.clear();
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mCondition.notify_all();
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}
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mThread.join();
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}
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size_t size() const {
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std::lock_guard l(mLock);
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return mMap.size();
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}
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private:
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void threadLoop() NO_THREAD_SAFETY_ANALYSIS { // thread safety doesn't cover unique_lock
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std::unique_lock l(mLock);
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while (!mQuit) {
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auto sleepUntilTime = std::chrono::time_point<std::chrono::steady_clock>::max();
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if (!mMap.empty()) {
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sleepUntilTime = mMap.begin()->first;
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if (sleepUntilTime <= std::chrono::steady_clock::now()) {
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auto node = mMap.extract(mMap.begin()); // removes from mMap.
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l.unlock();
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node.mapped()();
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l.lock();
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continue;
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}
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}
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mCondition.wait_until(l, sleepUntilTime);
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}
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}
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mutable std::mutex mLock;
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std::condition_variable mCondition GUARDED_BY(mLock);
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bool mQuit GUARDED_BY(mLock) = false;
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std::multimap<std::chrono::time_point<std::chrono::steady_clock>, std::function<void()>>
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mMap GUARDED_BY(mLock); // multiple functions could execute at the same time.
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// needs to be initialized after the variables above, done in constructor initializer list.
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std::thread mThread;
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};
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} // namespace android::mediametrics
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