死锁编码及定位分析
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2022-04-17 22:38:29
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import java.util.concurrent.TimeUnit;
class HoldLockThread implements Runnable {
private String lockA;
private String lockB;
public HoldLockThread(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 zcl
* @date 2021/9/7 15:00
*/
public class DeadLockDemo {
public static void main(String[] args) {
String lockA="lockA";
String lockB="lockB";
new Thread(new HoldLockThread(lockA,lockB),"ThreadAAA").start();
new Thread(new HoldLockThread(lockB,lockA),"ThreadBBB").start();
/**
* windows下的 jps=ps ef...
*/
}
}
打印
ThreadAAA 自己持有lockA 尝试获得lockB
ThreadBBB 自己持有lockB 尝试获得lockA
jps -l查找线程号
jstack 25092
Java stack information for the threads listed above:
===================================================
"ThreadBBB":
at HoldLockThread.run(DeadLockDemo.java:18)
- waiting to lock <0x0000000715d93608> (a java.lang.String)
- locked <0x0000000715d93640> (a java.lang.String)
at java.lang.Thread.run(Thread.java:748)
"ThreadAAA":
at HoldLockThread.run(DeadLockDemo.java:18)
- waiting to lock <0x0000000715d93640> (a java.lang.String)
- locked <0x0000000715d93608> (a java.lang.String)
at java.lang.Thread.run(Thread.java:748)
Found 1 deadlock.
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