JUC-spinLock

最新推荐文章于 2024-11-13 22:59:02 发布

BIG_BIG_ZHOU

最新推荐文章于 2024-11-13 22:59:02 发布

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文章标签：多线程

本文链接：https://blog.youkuaiyun.com/BIG_BIG_ZHOU/article/details/130181187

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该代码示例展示了如何使用Java的AtomicReference类实现一个简单的自旋锁。两个线程A和B尝试获取并释放锁。lock方法通过compareAndSet操作在当前线程和null之间进行比较并交换，以确保线程安全地获取和释放锁。

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package juc.spinlock;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;


public class TestSpinLock {
    
    public static void main(String[] args) {
        TestSpinLock testSpinLock = new TestSpinLock();
        new Thread(()->{
            testSpinLock.lock();
            try { TimeUnit.SECONDS.sleep( 5 ); } catch (InterruptedException e) { e.printStackTrace(); }
            testSpinLock.unlock();
        },"A").start();

        new Thread(()->{
            testSpinLock.lock();
            try { TimeUnit.SECONDS.sleep( 5 ); } catch (InterruptedException e) { e.printStackTrace(); }
            testSpinLock.unlock();
        },"B").start();
    }
    AtomicReference<Thread> atomicReference = new AtomicReference<>();
    public void lock()  {
        Thread thread = Thread.currentThread();
        System.out.println(thread.getName()+" come in lock");
        while(!atomicReference.compareAndSet(null,thread)){

        }
        System.out.println(thread.getName()+" leave lock");
    }

    public void unlock(){
        Thread thread = Thread.currentThread();
        System.out.println(thread.getName()+" come in unlock");
        while(!atomicReference.compareAndSet(thread,null)){

        }
        System.out.println(thread.getName()+" leave unlock");
    }
}