关于java:如何利用AtomicReference写一个简单的自旋锁

1. 自旋锁成品代码如下:

package lock.spinlock;import java.util.concurrent.TimeUnit;import java.util.concurrent.atomic.AtomicReference;/** * @author wuyiccc * @date 2020/7/19 10:37 * 岂曰无衣，与子同袍~ */public class SpinLock {    private AtomicReference<Thread> sign = new AtomicReference<>();    public void lock() {        Thread current = Thread.currentThread();        while (!sign.compareAndSet(null, current)) {            System.out.println("获取自旋锁失败，再次尝试");        }    }    public void unlock() {        Thread current = Thread.currentThread();        sign.compareAndSet(current, null);    }    public static void main(String[] args) {        SpinLock lock = new SpinLock();        Runnable runnable = new Runnable() {            @Override            public void run() {                System.out.println(Thread.currentThread().getName() + "开始尝试获取自旋锁...");                lock.lock();                System.out.println(Thread.currentThread().getName() + "获取自旋锁胜利...");                try {                    TimeUnit.SECONDS.sleep(1);                } catch (InterruptedException e) {                    e.printStackTrace();                } finally {                    System.out.println(Thread.currentThread().getName() + "开释了自旋锁...");                    lock.unlock();                }            }        };        Thread t1 = new Thread(runnable, "线程1");        Thread t2 = new Thread(runnable, "线程2");        t1.start();        t2.start();    }}

2. 外围代码解说