自旋鎖：spinlock

是指嘗試獲取鎖的線程不會立即阻塞，而是采用循環的方式獲取鎖，這樣的好處是減少線程上下文切換的消耗，缺點是循環好用CPU

代碼：

import java.util.concurrent.TimeUnit;

import java.util.concurrent.atomic.AtomicReference;

public class SpinLockDemo {

//原子引用線程

AtomicReference atomicReference = new AtomicReference<>();

public void myLock() {

Thread thread = Thread.currentThread();

System.out.println(Thread.currentThread().getName() + "\t come in ");

while (!atomicReference.compareAndSet(null, thread)) {

}

}

public void myUnlock() {

Thread thread = Thread.currentThread();

atomicReference.compareAndSet(thread, null);

System.out.println(Thread.currentThread().getName() + "\t invoked myUnlock()");

}

public static void main(String[] args) {

SpinLockDemo spinLockDemo = new SpinLockDemo();

new Thread(() -> {

spinLockDemo.myLock();

try {

TimeUnit.SECONDS.sleep(5);

}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();

}

}

原文：https://www.cnblogs.com/sunliyuan/p/12436777.html

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