thr_sigpending.c revision 117300 
1/*
2 * Copyright (c) 1999 Daniel Eischen <eischen@vigrid.com>.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by John Birrell.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY DANIEL EISCHEN AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * $FreeBSD: head/lib/libkse/thread/thr_sigpending.c 117300 2003-07-07 04:28:23Z davidxu $
33 */
34#include <sys/param.h>
35#include <sys/types.h>
36#include <sys/signalvar.h>
37#include <signal.h>
38#include <errno.h>
39#include <pthread.h>
40#include "thr_private.h"
41
42__weak_reference(_sigpending, sigpending);
43
44int
45_sigpending(sigset_t *set)
46{
47	struct pthread *curthread = _get_curthread();
48	kse_critical_t crit;
49	sigset_t sigset;
50	int ret = 0;
51
52	/* Check for a null signal set pointer: */
53	if (set == NULL) {
54		/* Return an invalid argument: */
55		ret = EINVAL;
56	}
57	else {
58		if (!_kse_isthreaded())
59			return __sys_sigpending(set);
60
61		crit = _kse_critical_enter();
62		KSE_SCHED_LOCK(curthread->kse, curthread->kseg);
63		sigset = curthread->sigpend;
64		KSE_SCHED_UNLOCK(curthread->kse, curthread->kseg);
65		KSE_LOCK_ACQUIRE(curthread->kse, &_thread_signal_lock);
66		SIGSETOR(sigset, _thr_proc_sigpending);
67		KSE_LOCK_RELEASE(curthread->kse, &_thread_signal_lock);
68		_kse_critical_leave(crit);
69		*set = sigset;
70	}
71	/* Return the completion status: */
72	return (ret);
73}
74