java - 如果 Thread.sleep 是静态的，单个线程如何知道它已进入休眠状态？

Question

我对 Thread.sleep() 方法有点困惑。如果 Thread.sleep() 是静态方法，两个线程如何知道哪个线程进入休眠状态。例如，在下面的代码中，我有两个三个 Threadsmain、t 和 t1。我总是调用 Thread.sleep()。不是 t.sleep()。这是否意味着 Thread.sleep() 使当前线程进入休眠状态？这意味着 Thread 实例通过调用静态方法自行进入休眠状态。如果 t1 想让 t 进入休眠状态怎么办？这不可能是正确的？

public class ThreadInterrupt {

    public static void main(String[] args) throws InterruptedException {

        System.out.println("Starting.");

        Thread t  = new Thread(new Runnable(){

            @Override
            public void run() {
                Random ran = new Random();

                for (int i = 0; i < 1E8; i++) {

                    try {
                        Thread.sleep(100);
                    } catch (InterruptedException e) {
                        System.out.println("we have been interrupted");
                        e.printStackTrace();
                    }
        });

        Thread t2 = new Thread(new Runnable() {
                 public void run() {
                         //some stuff
                 }
        });    
        t.start();
        t2.start();

        Thread.sleep(500);
        t.interrupt();
        t.join();

        System.out.println("Finished.");
    }

}

Answer 1

Does it mean Thread.sleep() puts the current Thread to sleep?

是的。只有当前线程可以这样做。

What if t1 wants to put t to sleep. that shouldn't be possible correct?

没错。您可以设置一个 volatile boolean 标志，这将导致另一个线程调用 Thread.sleep(...) 但另一个线程不能导致线程 hibernate 。

 volatile boolean shouldSleep = false;
 ...
 // check this flag that might be set by another thread to see if I should sleep
 if (shouldSleep) {
     Thread.sleep(...);
 }