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Good point. There are multiple levels of "safety". I think glibc API does a decent job marking and indicating which is which:

https://sourceware.org/glibc/manual/2.40/html_node/POSIX-Saf...

  Thread-Safe 
  Async-Signal-Safe
  Async-Cancel-Safe (mostly limited to pthread_*cancel*)
There is a host of other "safety" remarks also useful to keep in mind: https://sourceware.org/glibc/manual/2.40/html_node/Other-Saf...



this isn't about safety, though; hcreate() and hsearch() don't support having two hash tables in the same process at the same time, not even in an unsafe way. that also makes them non-reentrant, but that isn't the main problem!




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