2 @section @code{_setjmp}
5 POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/_setjmp.html}
9 Portability problems fixed by Gnulib:
13 Portability problems not fixed by Gnulib:
17 Note: A future revision of POSIX later than the 2008/2009 one may drop the
18 functions @code{_setjmp} and @code{_longjmp}. Still, in 2008, on all
19 systems which have @code{_setjmp}, it is the fastest way to save the
20 registers but not the signal mask (up to 30 times faster than @code{setjmp}