自旋锁
目的:手写自旋锁,要求只有一个线程能够获得锁,获得锁的线程未释放锁前,其余线程一直循环访问
package com.motorye.day331_spinLock; import java.util.concurrent.atomic.AtomicReference; public class SpinLock { AtomicReference<Thread> atomicReference = new AtomicReference<>(); public void mylock(){ System.out.println(Thread.currentThread().getName()+"来了"); Thread thread = Thread.currentThread(); while (!atomicReference.compareAndSet(null, thread)){} System.out.println(Thread.currentThread().getName()+"成功获得锁"); } public void unmylock(){ System.out.println(Thread.currentThread().getName()+"准备走"); Thread thread = Thread.currentThread(); atomicReference.compareAndSet(thread, null); System.out.println(Thread.currentThread().getName()+"彻底释放锁"); } public static void main(String[] args) { SpinLock spinLock = new SpinLock(); new Thread(new Runnable() { @Override public void run() { spinLock.mylock(); try { Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } spinLock.unmylock(); } },"aaa").start(); new Thread(new Runnable() { @Override public void run() { spinLock.mylock(); spinLock.unmylock(); } },"bbb").start(); } }
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