deadlock.java

这是一个java多线程示例代码,示例线程死锁

package com.examples.thread;

public class Deadlock {
    public static void main(String[] args) {
        // These are the two resource objects we'll try to get locks for
        final Object resource1 = "resource1";
        final Object resource2 = "resource2";
        // Here's the first thread.  It tries to lock resource1 then resource2
        Thread t1 = new Thread() {
		public void run() {
		    // Lock resource 1
		    synchronized(resource1) {
			System.out.println("Thread 1: locked resource 1");
			
			// Pause for a bit, simulating some file I/O or
			// something.  Basically, we just want to give the
			// other thread a chance to run.  Threads and deadlock
			// are asynchronous things, but we're trying to force
			// deadlock to happen here...
			try { Thread.sleep(50); }
			catch (InterruptedException e) {}
			
			// Now wait 'till we can get a lock on resource 2
			synchronized(resource2) {
			    System.out.println("Thread 1: locked resource 2");
			}
		    }
		}
	    };
        
        // Here's the second thread.  It tries to lock resource2 then resource1
        Thread t2 = new Thread() {
		public void run() {
		    // This thread locks resource 2 right away
		    synchronized(resource2) {
			System.out.println("Thread 2: locked resource 2");
			
			// Then it pauses, just like the first thread.
			try { Thread.sleep(50); }
			catch (InterruptedException e) {}
			
			// Then it tries to lock resource1.  But wait!  Thread
			// 1 locked resource1, and won't release it 'till it
			// gets a lock on resource2.  This thread holds the
			// lock on resource2, and won't release it 'till it
			// gets resource1.  We're at an impasse. Neither
			// thread can run, and the program freezes up.
			synchronized(resource1) {
			    System.out.println("Thread 2: locked resource 1");
			}
		    }
		}
	    };
        
        // Start the two threads. If all goes as planned, deadlock will occur, 
        // and the program will never exit.
        t1.start(); 
        t2.start();
    }
}