Doc tweak.

[gnulib.git] / doc / posix-functions / _longjmp.texi

diff --git a/doc/posix-functions/_longjmp.texi b/doc/posix-functions/_longjmp.texi
index 8f1dcc0..2712395 100644 (file)
--- a/doc/posix-functions/_longjmp.texi
+++ b/doc/posix-functions/_longjmp.texi
@@ -16,3 +16,9 @@ Portability problems not fixed by Gnulib:
 This function is missing on some platforms:
 Solaris 2.5.1, mingw.
 @end itemize
+
+Note: A future revision of POSIX later than the 2008/2009 one may drop the
+functions @code{_setjmp} and @code{_longjmp}.  Still, in 2008, 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).