thread_safe

找 "Thread-safe functions" http://www.kernel.org/doc/man-pages/online/pages/man7/pthreads.7.html
就會看到黑名單,黑名單會長,但長得很慢、且你不會踩到.

POSIX 標準之內會在 specify 某 function 時說 The xxx() function need not be reentrant. 到 http://pubs.opengroup.org/onlinepubs/9699919799/ "word search" -> reentrant

non-reentry

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