自旋鎖的實現

1、請自己寫一個自旋鎖。

OK，不僅寫好了；而且驗證一遍。

/**
 * @program: mybatis
 * @description: 自己實現一個自旋鎖
 * @author: Miller.FAN
 * @create: 2019-11-13 14:19
 **/
public class MyLock {

    private AtomicReference atomicReference = new AtomicReference();


        public void getLock() {
            Thread thread = Thread.currentThread();
            System.out.printf(thread.getName() + "\t come in \n");
            while(!atomicReference.compareAndSet(null,thread))
            {
               // System.out.println("裏面的哥們兒快點，我憋不住了！");
            }
        }

        public void giveLock() {
            Thread thread = Thread.currentThread();
            System.out.printf(thread.getName() + "\t back out \n");
            atomicReference.compareAndSet(thread,null);
            System.out.println(thread.getName() + "完事了，馬上出來！\n");
        }



    public static void main(String[] args) {
        MyLock m_lock = new MyLock();
        new Thread(()-> {
            m_lock.getLock();
            try {
                TimeUnit.SECONDS.sleep(3);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }finally {
                m_lock.giveLock();
            }
        },"AA").start();

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

        new Thread(()-> {
            m_lock.getLock();
            try {
                TimeUnit.SECONDS.sleep(3);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }finally {
                m_lock.giveLock();
            }
        },"BB").start();

    }
}

2、測試結果

AA	 come in 
BB	 come in 
AA	 back out 
AA完事了，馬上出來！

BB	 back out 
BB完事了，馬上出來！

3、分析