Java_016：死锁线程例子（摘录+整理）

1. DeadThread.java

public class DeadThread implements Runnable{

private Object monitor_A = new Object();

private Object monitor_B = new Object();

public void  method_A(){
synchronized(monitor_A) {
      synchronized(monitor_B) {
              System.out.println(Thread.currentThread().getName()+" invoke method A");
          }              
      }  
}

public void  method_B(){
synchronized(monitor_B) {
      synchronized(monitor_A) {
      System.out.println(Thread.currentThread().getName()+" invoke method B");
          }              
      }  
}

public void run() {
for(int i=0;i<1 class="Apple-tab-span" i--="" span="" style="white-space: pre;">

  method_A();
method_B();
}  
}

  public static void main(String[] args) {
 DeadThread t1 = new DeadThread();
       Thread ta = new Thread(t1, "A");
       Thread tb = new Thread(t1, "B");

       ta.start();
       tb.start();
  }
}

2. 线程A和线程B的thread dump
"B" prio=5 tid=0x00007fefa8886800 nid=0x5903 waiting for monitor entry [0x000000011daa6000]
   java.lang.Thread.State: BLOCKED (on object monitor)
at DeadThread.method_A(DeadThread.java:10)
- waiting to lock <0x00000007aab2c0b0> (a java.lang.Object)
- locked <0x00000007aab2c0a0> (a java.lang.Object)
at DeadThread.run(DeadThread.java:25)
at java.lang.Thread.run(Thread.java:744)

"A" prio=5 tid=0x00007fefa8885800 nid=0x5703 waiting for monitor entry [0x000000011d9a3000]
   java.lang.Thread.State: BLOCKED (on object monitor)
at DeadThread.method_B(DeadThread.java:18)
- waiting to lock <0x00000007aab2c0a0> (a java.lang.Object)
- locked <0x00000007aab2c0b0> (a java.lang.Object)
at DeadThread.run(DeadThread.java:26)
at java.lang.Thread.run(Thread.java:744)

3. 直接报告死锁的thread dump
Found one Java-level deadlock:
=============================
"B":
  waiting to lock monitor 0x00007fefa8850cb8 (object 0x00000007aab2c0b0, a java.lang.Object),
  which is held by "A"
"A":
  waiting to lock monitor 0x00007fefa88522b8 (object 0x00000007aab2c0a0, a java.lang.Object),
  which is held by "B"

Java stack information for the threads listed above:
===================================================
"B":
at DeadThread.method_A(DeadThread.java:10)
- waiting to lock <0x00000007aab2c0b0> (a java.lang.Object)
- locked <0x00000007aab2c0a0> (a java.lang.Object)
at DeadThread.run(DeadThread.java:25)
at java.lang.Thread.run(Thread.java:744)
"A":
at DeadThread.method_B(DeadThread.java:18)
- waiting to lock <0x00000007aab2c0a0> (a java.lang.Object)
- locked <0x00000007aab2c0b0> (a java.lang.Object)
at DeadThread.run(DeadThread.java:26)
at java.lang.Thread.run(Thread.java:744)

Found 1 deadlock.

参考文献：
1. http://blog.csdn.net/jackie_xiaonan/article/details/8546541
2. http://www.cnblogs.com/tomsheep/archive/2010/06/10/1755840.html