(Core-JAVA) Deadlock Example

最新推荐文章于 2024-05-12 17:08:25 发布

palmerma

最新推荐文章于 2024-05-12 17:08:25 发布

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分类专栏： CORE-JAVA

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本文通过一个具体的Java程序示例展示了死锁的发生过程。程序中两个线程分别占用了一个锁资源并试图获取对方持有的锁，导致双方都陷入等待状态，形成死锁。此案例有助于理解并发编程中死锁的概念及预防措施。

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Deadlock means A is occupied, B is occupied, then A requires B and B requires A.

package thread.deadlock;
public class DeadLock2 extends Thread {
   private Lock a = new Lock("A");
   private Lock b = new Lock("B");
   public DeadLock2() {
       //It is the second thread.
       Thread secondThread = new Thread(this, "2nd thread");
       secondThread.start();
       b.lock(a);
   }
   public class Lock {
       private String name;
       public Lock(String name) {
           this.name = name;
       }
       public String getName() {
           return this.name;
       }
       public synchronized void lock(Lock lock) {
           System.out.println(this.getName() + " is locked.");
           try {
               Thread.sleep(1000);
           } catch (InterruptedException e) {
               e.printStackTrace();
           }
           System.out.println("If the lock " + lock.getName()
                   + " is unlock, it continues.");
           lock.printName();
       }
       public synchronized void printName() {
           System.out.println(this.getClass().toString());
       }
   }

   @Override
   public void run() {
       a.lock(b);
   }

   public static void main(String args[]) {
       //DeadLock2 is the first thread.
       new DeadLock2().start();
   }

}