mirror of
https://github.com/kodjodevf/mangayomi.git
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91 lines
2.3 KiB
C++
91 lines
2.3 KiB
C++
// This file is a part of media_kit
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// (https://github.com/media-kit/media-kit).
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//
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// Copyright © 2021 & onwards, Hitesh Kumar Saini <saini123hitesh@gmail.com>.
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// All rights reserved.
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// Use of this source code is governed by MIT license that can be found in the
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// LICENSE file.
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#ifndef THREAD_POOL_H_
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#define THREAD_POOL_H_
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#include <functional>
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#include <future>
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#include <queue>
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#ifdef _WIN32
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#include <Windows.h>
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#endif
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class ThreadPool {
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public:
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explicit ThreadPool(size_t);
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template <class F, class... Args>
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decltype(auto) Post(F&& f, Args&&... args);
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~ThreadPool();
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private:
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std::vector<std::thread> workers_;
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std::queue<std::packaged_task<void()>> tasks_;
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std::mutex queue_mutex_;
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std::condition_variable condition_;
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std::condition_variable condition_producers_;
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bool stop_;
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};
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inline ThreadPool::ThreadPool(size_t threads) : stop_(false) {
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for (size_t i = 0; i < threads; i++) {
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workers_.emplace_back([&] {
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for (;;) {
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std::packaged_task<void()> task;
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{
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std::unique_lock<std::mutex> lock(queue_mutex_);
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condition_.wait(lock, [&] { return stop_ || !tasks_.empty(); });
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if (stop_ && tasks_.empty())
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return;
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task = std::move(tasks_.front());
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tasks_.pop();
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if (tasks_.empty()) {
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condition_producers_.notify_one();
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}
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}
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task();
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}
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});
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#ifdef _WIN32
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::SetThreadPriority(workers_.back().native_handle(),
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THREAD_PRIORITY_HIGHEST);
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#endif
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}
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}
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template <class F, class... Args>
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decltype(auto) ThreadPool::Post(F&& f, Args&&... args) {
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using return_type = std::invoke_result_t<F, Args...>;
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std::packaged_task<return_type()> task(
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std::bind(std::forward<F>(f), std::forward<Args>(args)...));
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std::future<return_type> res = task.get_future();
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{
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std::unique_lock<std::mutex> lock(queue_mutex_);
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if (stop_) {
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throw std::runtime_error("ThreadPool::Post");
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}
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tasks_.emplace(std::move(task));
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}
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condition_.notify_one();
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return res;
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}
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inline ThreadPool::~ThreadPool() {
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{
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std::unique_lock<std::mutex> lock(queue_mutex_);
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condition_producers_.wait(lock, [this] { return tasks_.empty(); });
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stop_ = true;
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}
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condition_.notify_all();
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for (std::thread& worker : workers_) {
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worker.join();
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}
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}
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#endif // THREAD_POOL_H_
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