是Windows的rand_s线程安全的？ [英] Is Windows' rand_s thread-safe?

问题描述

正如标题。是令人怀疑的是，但我找不到它的任何地方明确规定。而对于这个属性我不喜欢靠猜测。

Just as in title. Is suspect it is, but I couldn't find it anywhere explicitly stated. And for this property I wouldn't like to rely on speculations.

推荐答案

如果您使用的多线程版本，所有的功能都是线程安全的，因为任何线程特定信息存储在的 TLS 。 rand_s居然不首先使用状态信息，因为它只是调用操作系统API，所以线程安全的问题并不存在于rand_s。兰特（），但是依赖于种子值产生一个随机数。

If you use the multithreaded version of the CRT, all functions are thread safe, because any thread-specific information is stored in TLS. rand_s actually doesn't use state information in the first place, since it just calls an OS API, so question of thread-safety doesn't arise for rand_s. rand(), however depends on a seed value to generate a random number.

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