在Java中写long和double不是原子的？ [英] Writing long and double is not atomic in Java?

问题描述

读取和写入单个变量是原子的（语言保证！），除非变量类型为long或double。

Reading and writing of a single variable is atomic (language guarantee!), unless the variable is of type long or double.

我正在阅读课程的幻灯片，我发现写了。这个类是关于并发的。

I was reading a course's slides and I found that written. The class was about concurrency.

任何人都可以向我解释为什么写一个long或double不是一个原子操作？这真的让我吃惊。

Can anyone explain to me why writing a long or a double is not an atomic operation? It really took me by surprise.

推荐答案

它不是原子的，因为它是一个多步操作在机器代码级别。也就是说，longs和doubles比处理器的字长更长。

It's not atomic because it's a multiple-step operation at the machine code level. That is, longs and doubles are longer than the processor's word length.

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