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volatile保证原子性 #143

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Hewei-ss opened this issue May 11, 2024 · 1 comment

Hewei-ss commented May 11, 2024

章节
第八章 volatile

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疑问
对单个volatile修饰的变量的写操作，第一步：JMM会先将这个变量写到线程本地缓存中，第二步：再将这个变量刷新到主存中。这是两步，为什么说volatile能保证对单个volatile变量的读/写具有原子性？？？

gongxuanzhang commented Aug 11, 2024

@Hewei-ss
因为volatile有内存屏障，对于单一变量的读写，只要保证对这个变量的读写永远是最新的即可

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