71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
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#pragma once
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#include <vector>
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#include <queue>
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#include <memory>
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#include <thread>
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#include <mutex>
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#include <condition_variable>
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#include <future>
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#include <functional>
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#include <stdexcept>
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class ThreadPool {
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private:
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std::vector<std::thread> threads;
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std::queue<std::function<void()>> queue;
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std::mutex mut;
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std::condition_variable cv;
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bool exit = false;
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public:
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ThreadPool(size_t size) {
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for (size_t i = 0; i < size; i++) {
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threads.emplace_back([this] {
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while (true) {
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std::function<void()> func;
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std::unique_lock<std::mutex> lock(mut);
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cv.wait(lock, [this] { return exit || !queue.empty(); });
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if (exit && queue.empty()) return;
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func = std::move(queue.front());
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queue.pop();
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lock.unlock();
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func();
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}
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});
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}
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}
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~ThreadPool() {
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exit = true;
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mut.lock();
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mut.unlock();
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cv.notify_all();
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for (auto &thread : threads) {
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if (thread.joinable()) {
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thread.join();
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}
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}
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}
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size_t queue_size() {
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std::unique_lock<std::mutex> lock(mut);
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return queue.size();
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}
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template<class T, class... Args>
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auto add(T&& func, Args&&... args)
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-> std::future<typename std::result_of<T(Args...)>::type> {
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using ret_t = typename std::result_of<T(Args...)>::type;
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auto task = std::make_shared<std::packaged_task<ret_t()>>(
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std::bind(std::forward<T>(func), std::forward<Args>(args)...));
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std::future<ret_t> fut = task->get_future();
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std::unique_lock<std::mutex> lock(mut);
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queue.emplace([task] () { (*task)(); });
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lock.unlock();
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cv.notify_one();
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return fut;
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}
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};
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