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learningsummary's Issues

面试官问我什么是JMM--内存屏障问题？

感谢博主的总结各篇有营养的文章，下面说一下自己的疑惑问题。
在《面试官问我什么是JMM》中提到了内存屏障，然后给了两个示例，我觉得是有问题的。说一下个人的理解：

  1. 一个volatile读，应该是在该指令前加入StoreLoad屏障，在后面加入LoadStore屏障，保障前后的写操作不会对当前命令造成影响，而文中给的例子没有提及在前面加入StoreLoad，反而在后面加入了LoadLoad屏障，我认为读读操作交换顺序是不会产生问题的。
  2. 一个volatile写，应该是在该指令前加入LoadStore屏障和StoreStore屏障，在后面加入StoreStore和StoreLoad屏障，如此保证前后的读写操作不会与当前的写操作产生影响。

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