线程随笔-测试deadlock

最新推荐文章于 2025-07-02 11:35:07 发布

cobain_peng

最新推荐文章于 2025-07-02 11:35:07 发布

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分类专栏： Java 文章标签： thread

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本文通过一个简单的Java示例展示了如何在多线程环境中产生死锁。代码中两个线程分别持有不同的对象锁，在尝试获取对方持有的锁时陷入无限等待状态，导致程序停止运行。

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package test.Thread;

public class testDeadLock {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		deadRunner r1 = new deadRunner();
		r1.flag = 1;
		deadRunner r2 = new deadRunner();
		r2.flag = 2;

		Thread t1 = new Thread(r1);
		Thread t2 = new Thread(r2);
		
		t1.start();
		t2.start();
	}

}

class deadRunner implements Runnable {

	int flag = 1;
	static Object o1 = new Object();
	static Object o2 = new Object();

	public void run() {
		// TODO Auto-generated method stub
		System.out.println("flag=" + flag);
		if (1 == flag) {
			synchronized (o1) {
				try {
					Thread.sleep(1000);
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				synchronized (o2) {
					System.out.println("this is flag 1");
				}
			}
		}

		if (0 == flag) {
			synchronized (o2) {
				try {
					Thread.sleep(1000);
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				synchronized (o1) {
					System.out.println("this is flag 2");
				}
			}
		}
	}

}

the result is:

flag=1
flag=2