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DeadLockDemo.java
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DeadLockDemo.java
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package com.atguigu.test_deadlock;
import java.util.concurrent.TimeUnit;
class HoldLock implements Runnable{
private String lockA;
private String lockB;
public HoldLock(String lockA, String lockB) {
this.lockA = lockA;
this.lockB = lockB;
}
@Override
public void run() {
synchronized (lockA){
System.out.println(Thread.currentThread().getName()+"\t自己持有:"+lockA+"\t尝试获得:"+lockB);
try {
TimeUnit.SECONDS.sleep(2);
} catch (InterruptedException e) {
e.printStackTrace();
}
synchronized (lockB){
System.out.println(Thread.currentThread().getName()+"\t自己持有:"+lockB+"\t尝试获得:"+lockA);
}
}
}
}
/**
* @author zhudunfeng
* @date 2020/8/20 22:54
* 死锁是指两个或两个以上的进程在执行过程中,
* 因为抢夺资源而造成的一种互相等待的现象,
* 若无外力干预那么它们将无法推进下去
*/
public class DeadLockDemo {
public static void main(String[] args) {
String lockA="lockA";
String lockB="lockB";
new Thread(new HoldLock(lockA, lockB),"ThreadAAA").start();
new Thread(new HoldLock(lockB, lockA),"ThreadBBB").start();
/**
* 怎样定位死锁位置
* linux ps -ef|grep xxx ls -l
* windows下的java运行程序 也有类似ps的查看进程的命令,但是目前我们查看的只是java
* jps= java ps jps -l 查询进程号
* jstack 进行号
*/
}
}