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Languguage OS 2
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Languguage OS II Version 10-94 (Knowledge Media)(1994).ISO
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sigsuspend.c
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1994-05-05
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/* Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <ansidecl.h>
#include <errno.h>
#include <hurd.h>
#include <hurd/signal.h>
/* Change the set of blocked signals to SET,
wait until a signal arrives, and restore the set of blocked signals. */
int
DEFUN(sigsuspend, (set), CONST sigset_t *set)
{
struct hurd_sigstate *ss;
sigset_t newmask, oldmask;
if (set != NULL)
/* Crash before locking. */
newmask = *set;
ss = _hurd_self_sigstate ();
oldmask = ss->blocked;
if (set != NULL)
ss->blocked = newmask & ~_SIG_CANT_MASK;
/* Set the `suspended' bit and wait for a condition_signal on
SS->arrived. When a signal arrives and SS->suspended is set, the
signal thread does condition_signal (&SS->arrived) after clearing
SS->suspended. */
ss->suspended = 1;
do
{
#ifdef noteven
__condition_wait (&ss->arrived, &ss->lock);
#else /* XXX */
__mutex_unlock (&ss->lock); __swtch (); __mutex_lock (&ss->lock);
#endif
} while (ss->suspended);
ss->blocked = oldmask;
__mutex_unlock (&ss->lock);
/* We've been interrupted! And a good thing, too.
Otherwise we'd never return.
That's right; this function always returns an error. */
errno = EINTR;
return -1;
}