@node _setjmp
@section @code{_setjmp}
@findex _setjmp

POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/_setjmp.html}

Gnulib module: ---

Portability problems fixed by Gnulib:
@itemize
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
POSIX says this function is obsolescent and it is planned to be
removed in POSIX 202x.
@end itemize

Note: Despite its being removed from POSIX, in 2023 on all
systems which have @code{_setjmp}, it is the fastest way to save the
registers but not the signal mask (up to 30 times faster than @code{setjmp}
on some systems).
