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java | volatile 原理
source link: https://benpaodewoniu.github.io/2022/12/24/java140/
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java | volatile 原理
volatile 的底层实现是内存屏障。
- 对
volatile变量的写指令前会加入写屏障 - 对
volatile变量的读指令前会加入读屏障
写屏障保证在该屏障之前的，对共享变量的改动，都同步到主存中
保证在该屏障之后，对共享变量的读取，加载的是主存的最新数据
写屏障会确保指令重排序时，不会将写屏障之前的代码排在写屏障之后
读屏障会确保指令重排序时，不会将读屏障之后的代码排在读屏障之前
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