如何关闭线程分离C ++? [英] How to close thread detach C++?

问题描述

我以分离状态启动了线程. 如何从主函数关闭线程?

I launched thread as detach. How to close thread from main function?

void My()
{
   // actions  
}


void main()
{

    std::thread thr7(receive);
    thr7.detach();

    // close ?

}

推荐答案

简短答案:

使用共享变量来通知线程何时停止.

Short Answer:

Use a shared variable to signal threads when to stop.

除非调用其他方法，否则一旦调用detach，就不能直接从其父级调用join或terminate线程.

You cannot call join or terminate a thread directly from its parent once detach is called unless you use some other methods.

看看下面的代码(简单而又不太有意义)，它应该显示出一种简单的方式来完成您要问的事情:

Take a look at the following code (over simple and not very meaninful) which should show a simple way of doing what you are asking:

#include <atomic>
#include <chrono>
#include <condition_variable>
#include <iostream>
#include <mutex>
#include <string>
#include <thread>

std::mutex mu;
std::condition_variable cv;
bool finished = false;

void threadFunc()
{
    while(!finished)
    {

        std:: cout << "Thread doing work \n";
        std::this_thread::sleep_for(std::chrono::milliseconds(5));
    }

    std::cout << "End of Thread \n";
}

int main()
{

    {
        std::thread t1(threadFunc);
        t1.detach(); // Call `detach` to prevent blocking this thread

    } // Need to call `join` or `detach` before `thread` goes out of scope

    for (int i = 0; i < 5; ++i){
        std::this_thread::sleep_for(std::chrono::milliseconds(20));
        std::cout << "Main doing stuff: \n";
    }
    std::cout << "Terminating the thread\n";

    std::unique_lock<std::mutex> lock(mu);  
    finished = true;
    cv.notify_all();
    std::cout << "End of Main\n";
    return 0;
}

您使用共享变量来告诉线程何时终止其执行.

You use a shared variable to tell the threads when to terminate its execution.

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