在Java中的静态块中创建线程时导致死锁 [英] Deadlock caused while creating a Thread in a static block in Java

问题描述

我只是试图在Java中的 static 块中创建一个线程，导致发生死锁。代码段如下。

I was just trying to create a Thread in a static block in Java that caused a deadlock to occur. The code snippet is as follows.

package deadlock;

final public class Main
{
    static int value;

    static
    {
        final Thread t = new Thread()
        {
            @Override
            public void run()
            {
                value = 1;
            }
        };

        t.start();
        System.out.println("Deadlock detected");

        try
        {
            t.join();
        }
        catch (InterruptedException e)
        {
            System.out.println(e.getMessage());
        }
        System.out.println("Released");
    }

    public static void main(String...args)
    {
        //Java stuff goes here.
    }
}

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它只是在控制台上显示检测到死锁并挂起。我想发生死锁的原因可能是在 main（）方法之前首先加载 static 块被调用。你能在上面的代码片段中看到死锁的确切原因吗？

---

It just displays Deadlock detected on the console and hangs. I guess the reason for the deadlock to occur may be that the static block is loaded first before the main() method is invoked. Can you see the exact reason for the deadlock in the above code snippet?

推荐答案

为了让线程能够设置静态值，必须加载类。为了加载类，线程必须结束（以便静态块完成）。这可能就是你陷入僵局的原因。

In order for the thread to be able to set the static value, the class must be loaded. In order for the class to be loaded, the thread must end (so that the static block completes). That's probably why you have a deadlock.

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