Java synchronized阻塞的同步队列现象分析

最新推荐文章于 2025-03-02 21:58:34 发布

Ethan Zeng

最新推荐文章于 2025-03-02 21:58:34 发布

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分类专栏： JavaCore

本文链接：https://blog.youkuaiyun.com/WalleIT/article/details/88427722

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本文探讨Java中synchronized关键字导致的线程进入同步队列的现象，详细分析了线程如何从BLOCKED状态到尝试获取锁的过程。尽管线程请求同步的顺序是1-9，但实际获取锁的顺序却是9-1，揭示了锁释放和获取的非直观行为。

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public class Singleton {


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

        for (int i=0; i<10; i++){
            new Thread(new QueueThread()).start();
            Thread.sleep(10);
        }

    }

    static class QueueThread implements Runnable{

        @Override
        public void run() {
            System.out.println(Thread.currentThread().getName() + " is running...");
            synchronized (QueueThread.class){
                System.out.println(Thread.currentThread().getName() + " has got lock...");
                try {
                    Thread.sleep(500);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }


}


运行结果：
Thread-0 is running...
Thread-0 has got lock...
Thread-1 is running...
Thread-2 is running...
Thread-3 is running...
Thread-4 is running...