鲍均君

Java中多线程安全问题实例分析

案例

[java] view plain copy

package com.duyang.thread.basic.basethread;
/**
* @author ：jiaolian
* @date ：Created in 2020-12-16 14:02
* @description：线程不安全分析
* @modified By：
* 公众号:叫练
*/
public class ThreadUnsafe {
public static void main(String[] args) {
Thread task = new Task();
Thread threadA = new Thread(task,"A");
Thread threadB = new Thread(task,"B");
Thread threadC = new Thread(task,"C");
Thread threadD = new Thread(task,"D");
Thread threadE = new Thread(task,"E");
threadA.start();
threadB.start();
threadC.start();
threadD.start();
threadE.start();
}
private static class Task extends Thread {
int count = 5;
@Override
public void run() {
/**
* jvm分3步骤;
* 1.获取count(从主内存获取值)
* 2.count减1(在各自寄存器完成)
* 3.保存count(刷新到主内存)
* 说下可能执行的过程...
* A线程获取cpu的count值为5，A线程先减去1，保存count值为4刷新到主内存,此时还没有执行System.out.println count
* 切换到B线程，此时B线程的count值为4，因为B线程是从主内存取的，B线程count值减去1为3，此时刷新到主内存，主内存值变为3
* 切换到A线程，执行System.out.println count=3
* 切换到B线程，执行System.out.println count=3
* 情况就是这样的
*/
count--;
System.out.println(Thread.currentThread().getName() + " "+count);
}
}
}

可能的结果

结果得到下图（结论1图）

按理说应该是这样的啊

对，你想的没错，但是线程A，B的count值都等于3也是有可能的，下面我们来分析下。

详细分析

对于代码中45行，i--其实在JVM中，其实可以分为3步。

获取count值（从主内存获取值）
count减1（在各自寄存器完成）
保存count（刷新到主内存）

详细说下A，B实际上在机器中过程

A线程获取cpu的count值为5，A线程先减去1，保存count值为4刷新到主内存,此时还没有执行System.out.println打印count值。如下图所示

切换到B线程，此时B线程的count值为4，因为B线程是从主内存取的，B线程count值减去1为3，此时刷新到主内存，主内存值变为3

切换到A线程，执行System.out.println count=3
切换到B线程，执行System.out.println count=3
C D E线程正常执行

这就是<结论1图>的执行过程。

结论

多线程安全一直是个很重要的话题，希望大家都能尽快理解掌握，希望大家喜欢！

我是叫练，多叫多练，欢迎大家和我一起讨论交流，我会尽快回复大家，喜欢点赞哦。

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