Java 同时执行Thread.interrupt（）对象.notify（），为什么会有两个结果？

这里有两种可能的结果：

抛出中断异常

正常终止

为什么?

我不明白。当threadA被中断时，结果应该抛出InterruptedException。但有时执行这个程序，它可以正常完成

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环境：java8，mac

因为重新排序。在正常的终止编译器重新排序指令中断和通知中，中断在工作线程上调用，而没有中断的异常抛出。 尝试禁止读取volatile变量进行重新排序，您总是会遇到中断异常

public class WaitNotifyAll {
    private static volatile Object resourceA = new Object();

    public static void main(String[] args) throws Exception {
        Thread threadA = new Thread(new Runnable() {
            @Override
            public void run() {
                synchronized (resourceA) {
                    try {
                        System.out.println("threadA begin wait");
                        resourceA.wait();
                        System.out.println("threadA end wait");
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        });

        Thread threaB = new Thread(new Runnable() {
            @Override
            public void run() {
                synchronized (resourceA) {
                    System.out.println("threadC begin notify");
                    threadA.interrupt();
                    resourceA.notify();
                }
            }
        });

        threadA.start();

        Thread.sleep(1000);

        threaB.start();

        System.out.println("main over");
    }
 }

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}当线程同时收到中断和通知时，行为可能会有所不同

请参阅

信贷-Alex Otenko在并发兴趣邮件列表中

public class WaitNotifyAll {
private static volatile Object resourceA = new Object();

public static void main(String[] args) throws Exception {
    Thread threadA = new Thread(new Runnable() {
        @Override
        public void run() {
            synchronized (resourceA) {
                try {
                    System.out.println("threadA begin wait");
                    resourceA.wait();
                    System.out.println("threadA end wait");
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    });

    Thread threaB = new Thread(new Runnable() {
        @Override
        public void run() {
            synchronized (resourceA) {
                System.out.println("threadC begin notify");
                threadA.interrupt();
                System.out.print(resourceA);
                resourceA.notify();
            }
        }
    });

    threadA.start();

    Thread.sleep(1000);

    threaB.start();

    System.out.println("main over");
}