@node pthread_once
@subsection @code{pthread_once}
@findex pthread_once

POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/pthread_once.html}

Gnulib module: pthread-once
@mindex pthread-once

Portability problems fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
Minix 3.1.8, mingw, MSVC 14.
But the provided replacement is just a dummy on some of these platforms:
Minix 3.1.8.
@item
This function makes applications hang forever on some platforms:
@c https://cygwin.com/pipermail/cygwin/2024-May/255987.html
Cygwin 3.5.3.
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@end itemize
