自旋锁CAS（compareAndSet）

package com.atguigu.boot.com.atguigu;

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

public class SpinLockDemo {
    //原子引用线程
    AtomicReference<Thread> atomicReference=new AtomicReference<>();

    public void myLock(){
        Thread thread = Thread.currentThread();
        System.out.println(Thread.currentThread().getName()+"\t come in myLockO(∩_∩)O");
//        while(!atomicReference.compareAndSet(null,thread)){
//            System.out.println("");
//        }
        do{
            //System.out.println(Thread.currentThread().getName()+"线程正在尝试获取");
//            try {
//                TimeUnit.SECONDS.sleep(1);
//            } catch (InterruptedException e) {
//                e.printStackTrace();
//            }
        }while(!atomicReference.compareAndSet(null,thread));

    }

    public void myUnLock(){
        Thread thread = Thread.currentThread();
        System.out.println(Thread.currentThread().getName()+"\t come in myUnLockO(∩_∩)O");
        atomicReference.compareAndSet(thread,null);
    }

    public static void main(String[] args) {
        SpinLockDemo spinLockDemo=new SpinLockDemo();
        new Thread(()->{
            spinLockDemo.myLock();
            try {
                TimeUnit.SECONDS.sleep(3);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            spinLockDemo.myUnLock();
        },"AA").start();

        try {
            TimeUnit.SECONDS.sleep(1) ;
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        new Thread(()->{
            spinLockDemo.myLock();
            try {
                TimeUnit.SECONDS.sleep(1) ;
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            spinLockDemo.myUnLock();
        },"BB").start();

    }
}

 

package com.atguigu.boot.com.atguigu;

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

public class SpinLockDemo {
    //原子引用线程
AtomicReference<Thread> atomicReference=new AtomicReference<>();

    public void myLock(){
        Thread thread = Thread.currentThread();
        System.out.println(Thread.currentThread().getName()+"\t come in myLockO(∩_∩)O");
//        while(!atomicReference.compareAndSet(null,thread)){
//            System.out.println("");
//        }
do{
            //System.out.println(Thread.currentThread().getName()+"线程正在尝试获取");
//            try {
//                TimeUnit.SECONDS.sleep(1);
//            } catch (InterruptedException e) {
//                e.printStackTrace();
//            }
}while(!atomicReference.compareAndSet(null,thread));

    }

    public void myUnLock(){
        Thread thread = Thread.currentThread();
        System.out.println(Thread.currentThread().getName()+"\t come in myUnLockO(∩_∩)O");
        atomicReference.compareAndSet(thread,null);
    }

    public static void main(String[] args) {
        SpinLockDemo spinLockDemo=new SpinLockDemo();
        new Thread(()->{
            spinLockDemo.myLock();
            try {
                TimeUnit.SECONDS.sleep(3);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            spinLockDemo.myUnLock();
        },"AA").start();

        try {
            TimeUnit.SECONDS.sleep(1) ;
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        new Thread(()->{
            spinLockDemo.myLock();
            try {
                TimeUnit.SECONDS.sleep(1) ;
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            spinLockDemo.myUnLock();
        },"BB").start();

    }
}