java实现简单自旋锁

//自定义的自旋锁
public class SpinLockDemo {
    public static void main(String[] args) {

    }


    AtomicReference reference = new AtomicReference<Thread>();

    public void spinlock(){

    }

    //加锁
    public void lock(){
        Thread thread = Thread.currentThread();



        //自旋锁
        while (!reference.compareAndSet(null,thread)) {
            System.out.println(Thread.currentThread().getName() + " 开始自旋...");
            try {
                Thread.sleep(400);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

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

    }


    //解锁
    public void unlock(){
        Thread thread = Thread.currentThread();

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


        reference.compareAndSet(thread,null);
    }
}

class LockTest{



    public static void main(String[] args) {

        SpinLockDemo lock = new SpinLockDemo();

        new Thread(()->{
            lock.lock();
            try {
                TimeUnit.SECONDS.sleep(3);
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                lock.unlock();
            }
        },"Thread-01").start();

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

        new Thread(()->{

            lock.lock();

            try {
                TimeUnit.SECONDS.sleep(1);
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                lock.unlock();
            }
        },"Thread-02").start();
    }
}