Question

I am now porting an single-threaded library to support multi-threads, and I need the whole list of functions that use local static or global variables.

Any information is appreciated.

Answer 1

Check the manual page for each function you use … the non-thread-safe ones will be identified as such, and the manual page will mention a thread safe version when there is one (e.g., readdir_r). You could extract the list by running a script over the man pages.

Edit: Although my answer has been accepted, I fear that it is inaccurate and possibly dangerous. For example, while strerror_r mentions that it is a thread safe version of strerror, strerror itself says nothing about thread safety … what it says instead is “the string might be overwritten”, which merely implies that it isn’t thread-safe. So you need to search for at least “might be overwritten” as well as “thread”, but there’s no guarantee that even that will be complete.