72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
#include <condition_variable>
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#include <cstdlib>
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#include <functional>
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#include <future>
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#include <memory>
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#include <mutex>
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#include <queue>
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#include <thread>
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#include <vector>
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class ThreadPool {
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public:
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explicit ThreadPool(size_t threadNums = std::thread::hardware_concurrency()) : stop(false) {
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for (size_t i = 0; i < threadNums; ++i) {
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workers.emplace_back([this]() {
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for (;;) {
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std::function<void()> task;
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{
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std::unique_lock<std::mutex> lock(this->queue_mutex);
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this->condition.wait(lock, [this]() {
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return this->stop || !this->tasks.empty();
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});
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if (this->stop && this->tasks.empty()) return;
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task = std::move(this->tasks.front());
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this->tasks.pop();
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}
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task(); // 执行任务
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}
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});
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}
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}
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template<typename Func, typename ...Args>
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auto enqueue(Func&& f, Args&& ...args) {
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using return_type = std::invoke_result_t<Func, Args...>;
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auto task = std::make_shared<std::packaged_task<return_type()>>(
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std::bind(std::forward<Func>(f), std::forward<Args>(args)...)
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);
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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("enqueue on stopped Thread pool");
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}
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tasks.emplace([task = std::move(task)]() {
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(*task)();
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});
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}
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condition.notify_one();
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}
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~ThreadPool() {
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{
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std::unique_lock<std::mutex> lock(queue_mutex);
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stop = true;
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}
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condition.notify_all();// 唤醒所有线程，清理任务
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for (std::thread& worker : workers)
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worker.join();// 阻塞，等待所有线程执行结束
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}
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private:
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std::vector<std::thread> workers;
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std::queue<std::function<void()>> tasks;
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std::mutex queue_mutex;
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std::condition_variable condition;
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bool stop;
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};
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int main(){
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exit(EXIT_SUCCESS);
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}
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