Java高并发程序-Chapter3 JDK并发包（第十一讲）同步控制之 Semaphore

netcobol

于 2018-03-28 08:14:25 发布

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分类专栏：并发编程 Java高并发程序文章标签：并发编程

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本文介绍Semaphore共享锁的基本概念及使用方法，并通过一个Java程序实例演示如何控制多个线程并发访问临界区，确保资源合理利用。

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1. 概述

Semaphore 共享锁，运行多个线程同时临界区

2. 主要接口

public void acquire()
public void acquireUninterruptibly()
public boolean tryAcquire()
public boolean tryAcquire(long timeout, TimeUnit unit)

public void release()

3. 程序实例

package com.john.learn.high.concurent.ch03;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;

public class SemaphoreDemo implements Runnable {

   private final Semaphore semaphore = new Semaphore(5);

   public void run() {

       try {

          semaphore.acquire(2);

          Thread.sleep(1000);

          System.out.println(Thread.currentThread().getName() + " done!");

       } catch (InterruptedException e) {

       } finally {

          semaphore.release(2);
       }

   }

   public static void main(String[] args) {

       ExecutorService executorService = Executors.newCachedThreadPool();

       SemaphoreDemo semaphoreDemo = new SemaphoreDemo();

       for (int i = 0; i < 10; i++) {

          executorService.submit(semaphoreDemo);
       }

       executorService.shutdown();
   }
}