简单的线程池示例

线程池可以有效地管理和重用线程资源，避免频繁创建和销毁线程带来的开销。以下是一个简单的线程池示例。

cpp
#include <iostream>
#include <vector>
#include <thread>
#include <queue>
#include <mutex>
#include <condition_variable>
#include <functional>class ThreadPool {
public:ThreadPool(size_t numThreads);~ThreadPool();void enqueue(std::function<void()> func);private:std::vector<std::thread> workers;std::queue<std::function<void()>> tasks;std::mutex queueMutex;std::condition_variable condition;bool stop;void worker();
};ThreadPool::ThreadPool(size_t numThreads) : stop(false) {for (size_t i = 0; i < numThreads; ++i) {workers.emplace_back([this] { this->worker(); });}
}ThreadPool::~ThreadPool() {{std::unique_lock<std::mutex> lock(queueMutex);stop = true;}condition.notify_all();for (std::thread &worker : workers) {worker.join();}
}void ThreadPool::enqueue(std::function<void()> func) {{std::unique_lock<std::mutex> lock(queueMutex);tasks.push(func);}condition.notify_one();
}void ThreadPool::worker() {while (true) {std::function<void()> task;{std::unique_lock<std::mutex> lock(queueMutex);condition.wait(lock, [this] { return this->stop || !this->tasks.empty(); });if (this->stop && this->tasks.empty()) return;task = std::move(this->tasks.front());this->tasks.pop();}task();}
}// 示例使用
void exampleTask(int n) {std::cout << "Task " << n << " is being processed by thread " << std::this_thread::get_id() << std::endl;std::this_thread::sleep_for(std::chrono::seconds(1));
}int main() {ThreadPool pool(4); // 创建具有4个线程的线程池for (int i = 0; i < 10; ++i) {pool.enqueue([i] { exampleTask(i); });}`在这里插入代码片`std::this_thread::sleep_for(std::chrono::seconds(5)); // 保证主线程等待足够长的时间让线程池处理完任务return 0;
}