| 是否能重排序 | 第二个操作 | ||
|---|---|---|---|
| 第一个操作 | 普通读/写 | volatile读 | volatile写 |
| 普通读/写 | YES | NO | YES |
| volatile读 | NO | NO | NO |
| volatile写 | YES | NO | NO |
我理解的对volatile变量的重排序(编译器重排序和处理器重排序),主要目的是为了实现对volatile的写,Happend-Before对volatile的读
所以,按照我理解的话,并不需要像图表中那么严谨
PHP中文网2017-04-18 09:43:49
In the case of multi-threading, there is a synchronization problem between the thread working memory and the main memory. Volatile is only available immediately on the main memory
