计数信号量简单例子 Semaphore

最新推荐文章于 2025-06-25 20:10:36 发布

qq827010202

最新推荐文章于 2025-06-25 20:10:36 发布

阅读量575

点赞数

CC 4.0 BY-SA版权

分类专栏：多线程文章标签：多线程

本文链接：https://blog.youkuaiyun.com/ella110727/article/details/79421660

多线程专栏收录该内容

3 篇文章

订阅专栏

本文通过一个Java示例展示了如何使用Semaphore来实现线程间的互斥访问。示例中创建了一个许可数量为1的Semaphore实例，确保同一时刻只有一个线程能够进入临界区执行关键代码。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

import java.util.concurrent.Semaphore ;

public class SemaphoreTest {

   Semaphore binary = new Semaphore ( 1 ) ;

   public static void main ( String args []) {
   final SemaphoreTest test = new SemaphoreTest () ;
   new Thread (){
@ Override
  public void run (){
test. mutualExclusion () ;
   }
   }. start () ;

   new Thread (){
@ Override
  public void run (){
test. mutualExclusion () ;
   }
   }. start () ;

   }

   private void mutualExclusion () {
   try {
binary. acquire () ;

   //mutual exclusive region
   System. out. println ( Thread. currentThread (). getName () + " inside mutual exclusive region" ) ;
   Thread. sleep ( 1000 ) ;

   } catch ( InterruptedException i. e. ) {
ie. printStackTrace () ;
   } finally {
binary. release () ;
   System. out. println ( Thread. currentThread (). getName () + " outside of mutual exclusive region" ) ;
   }
   }

}

Output:
Thread- 0 inside mutual exclusive region
Thread- 0 outside of mutual exclusive region
Thread- 1 inside mutual exclusive region
Thread- 1 outside of mutual exclusive region