如何终止子级的父线程? [英] How do I terminate parent thread from child?

问题描述

如何从创建主线程的子线程中终止父线程(主线程)?我尝试了System.exit(1)，但它仅终止子线程.我还尝试过将条件放入main的while循环中，但显然它将在退出前尝试读取1个额外的输入.

How do I terminate the parent (main) thread from a child thread created my main? I tried System.exit(1) but it only terminate the child thread. I also tried putting a condition in main's while loop but it will obviously try to read 1 extra input before exiting.

public static void main(String[] args) throws IOException
{
    new Thread(new Runnable() 
    { 
      public void run() 
      { 
        while(true) 
        { 
            //meet a condition then terminate
        } 
      } 
    }).start(); 
    while (true)
    {
        String a = input.nextLine();
        //do something with input
    }
}

推荐答案

您不应该这样做.从该线程外部终止任何线程是一个非常糟糕的主意.这是因为终止线程不知道目标正在做什么以及终止是否在安全"点.例如，您可能正处于编写输出，进行计算或进行任何其他操作的过程中.

You shouldn't do this. It's a really bad idea to terminate any thread from outside that thread. This is because the terminating thread has no idea what the target is doing and whether it is at a "safe" point to terminate. For example you might be in the middle of writing output, or making calculations, or anything.

相反，您应该向另一个线程发送信号(使用多种方法中的任何一种)，然后该线程退出自身.要退出线程，只需从线程的run方法返回即可.

Instead you should send a signal to the other thread (using any one of a number of means) and that thread exits itself. To exit a thread just return from the thread's run method.

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