August 2021
Intermediate to advanced
450 pages
6h 57m
Chinese
Content preview from C++程序设计语言（第4部分：标准库）（原书第4版）
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41.4 volatile
说明符volatile用来指出一个对象可被线程控制范围之外的东西修改。例如：
volatile说明符主要是告知编译器不要优化掉明显冗余的读写操作。例如：
如果clock_register不是定义为volatile的，编译器完全有权利删除一个读操作并假定t1==t2。
除非是在直接处理硬件的底层代码中，否则不要使用volatile。
不要假定volatile在内存模型中有特殊含义，它确实没有。与某些新语言不同，在C++中volatile并非一种同步机制。为了进行同步，应使用atomic（见41.3节）、mutex（见42.3.1节）或condition_variable（见42.3.4节）。
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