如果使用第三方程序库，事情会变得更为复杂，因为您永远不知道哪部分程序库是可重入的，哪部分是不可重入的。

Things become even more complicated when you're using a third-party library, because you never know which parts of the library are reentrant and which are not.

youdao

在大部分系统中，malloc和free都不是可重入的，因为它们使用静态数据结构来记录哪些内存块是空闲的。

On most systems, malloc and free are not reentrant, because they use a static data structure that records which memory blocks are free.

youdao

近来很多提供商已经开始提供标准c程序库的可重入版本，这是一个好消息。

The good news is, these days many vendors have taken the initiative to provide reentrant versions of the standard C library.

youdao