n. reentrant
misc. reenterable
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.
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.
那是因为只有一些系统调用可以安全地调用内部信号：只有可重入的(re - entrant)或者不被信号中断的调用才可以被安全地调用。
That's because only a few system calls can be safely called inside signals. Only calls that are re-entrant or not interruptible by signals can be called safely.
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