Emmanuel Gil Peyrot authored Jul 11, 2019 and Jean-Baptiste Kempf committed Jul 15, 2019

This is using the Linux-only prctl(PR_SET_NAME, …) call, because glibc’s
pthread_setname_np() is doing exactly the same call so there is no
reason to use it instead, as it isn’t any more portable.

I don’t have any other OS to test this on, but if you want to add one
just add an #else defined(__YOUR_OS__) before the #else in thread.h.