Java多线程编程（生产者和消费者问题以及死锁） - JAVA

锁》一文中，简述死锁的概念与简单例子，但是所给的例子是不完整的，这里给出一个完整的例子。 /**
* Java线程：并发协作-死锁
*
* @author Administrator 2009-11-4 22:06:13
*/
public class Test {
public static void main(String[] args) {
DeadlockRisk dead = new DeadlockRisk();
MyThread t1 = new MyThread(dead, 1, 2);
MyThread t2 = new MyThread(dead, 3, 4);
MyThread t3 = new MyThread(dead, 5, 6);
MyThread t4 = new MyThread(dead, 7, 8);

t1.start();
t2.start();
t3.start();
t4.start();
}

}

class MyThread extends Thread {
private DeadlockRisk dead;
private int a, b;

MyThread(DeadlockRisk dead, int a, int b) {
this.dead = dead;
this.a = a;
this.b = b;
}

@Override
public void run() {

dead.read();
dead.write(a, b);
}
}

class DeadlockRisk {
private static class Resource {
public int value;
}

private Resource resourceA = new Resource();
private Resource resourceB = new Resource();

public int read() {
synchronized (resourceA) {
System.out.println("read():" + Thread.currentThread().getName() + "获取了resourceA的锁！");
synchronized (resourceB) {
System.out.println("read():" + Thread.currentThread().getName() + "获取了resourceB的锁！");
return resourceB.value + resourceA.value;
}
}
}

public void write(int a, int b) {
synchronized (resourceB) {
System.out.println("write():" + Thread.currentThread().getName() + "获取了resourceA的锁！");
synchronized (resourceA) {
System.out.println("write():" + Thread.currentThread().getName() + "获取了resourceB的锁！");
resourceA.value = a;
resourceB.value = b;
}
}
}
}

Java多线程编程（生产者和消费者问题以及死锁）(二)