C++线程问题 - 设置一个值以指示线程已完成

#include<iostream>
#include<thread>
#include <mutex>
#include<condition_variable>

std::mutex mtx;
std::condition_variable cv;
bool is_finished = false;

void worker_thread() {
    // 执行一些任务...

    // 设置一个值以指示线程已完成
    std::unique_lock<std::mutex> lock(mtx);
    is_finished = true;
    cv.notify_one();
}

int main() {
    std::thread worker(worker_thread);

    // 等待线程完成
    std::unique_lock<std::mutex> lock(mtx);
    cv.wait(lock, []{ return is_finished; });

    std::cout << "Thread finished."<< std::endl;

    worker.join();
    return 0;
}