完整版 笔记汇总 自己用AQS实现一个简单的线程协作器

Posted 2022-02-09 cowcow2100

对Java并发常见的工具类进行从使用到原理的详解，

包括CAS+AQS+ThreadLocal+ConcurrentHashMap+线程池+各种锁+并发综合实战项目

下载：​​Downlod​​ 

提取码：9voy 

package aqs;

import java.util.concurrent.locks.AbstractQueuedSynchronizer;

/**
 * 描述：     自己用AQS实现一个简单的线程协作器
 */
public class OneShotLatch 

    private final Sync sync = new Sync();

    public void signal() 
        sync.releaseShared(0);
    
    public void await() 
        sync.acquireShared(0);
    

    private class Sync extends AbstractQueuedSynchronizer 

        @Override
        protected int tryAcquireShared(int arg) 
            return (getState() == 1) ? 1 : -1;
        

        @Override
        protected boolean tryReleaseShared(int arg) 
           setState(1);

           return true;
        
    


    public static void main(String[] args) throws InterruptedException 
        OneShotLatch oneShotLatch = new OneShotLatch();
        for (int i = 0; i < 10; i++) 
            new Thread(new Runnable() 
                @Override
                public void run() 
                    System.out.println(Thread.currentThread().getName()+"尝试获取latch，获取失败那就等待");
                    oneShotLatch.await();
                    System.out.println("开闸放行"+Thread.currentThread().getName()+"继续运行");
                
            ).start();
        
        Thread.sleep(5000);
        oneShotLatch.signal();

        new Thread(new Runnable() 
            @Override
            public void run() 
                System.out.println(Thread.currentThread().getName()+"尝试获取latch，获取失败那就等待");
                oneShotLatch.await();
                System.out.println("开闸放行"+Thread.currentThread().getName()+"继续运行");
            
        ).start();