ReadWriteLock : 读写锁代码Demo

最新推荐文章于 2021-03-10 10:27:56 发布

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最新推荐文章于 2021-03-10 10:27:56 发布

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分类专栏：多线程文章标签： ReadWriteLock

本文链接：https://blog.youkuaiyun.com/u012014505/article/details/81016639

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本文通过一个Java示例展示了如何使用ReentrantReadWriteLock实现读写锁。在多线程环境中，读写锁允许多个读操作同时进行，而写操作则需要独占锁，确保数据一致性。

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package com.atguigu.juc;

import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

/*
* 1. ReadWriteLock : 读写锁
*
* 写写/读写需要“互斥”
* 读读不需要互斥
*
*/
public class TestReadWriteLock {

   public static void main(String[] args) {
       ReadWriteLockDemo rw = new ReadWriteLockDemo();

       new Thread(new Runnable() {

           @Override
           public void run() {
               rw.set((int)(Math.random() * 101));
           }
       }, "Write:").start();


       for (int i = 0; i < 100; i++) {
           new Thread(new Runnable() {

               @Override
               public void run() {
                   rw.get();
               }
           }).start();
       }
   }

}

class ReadWriteLockDemo{

   private int number = 0;

   private ReadWriteLock lock = new ReentrantReadWriteLock();

   //读
   public void get(){
       lock.readLock().lock(); //上锁

       try{
           System.out.println(Thread.currentThread().getName() + " : " + number);
       }finally{
           lock.readLock().unlock(); //释放锁
       }
   }

   //写
   public void set(int number){
       lock.writeLock().lock();

       try{
           System.out.println(Thread.currentThread().getName());
           this.number = number;
       }finally{
           lock.writeLock().unlock();
       }
   }
}