thr_sigsuspend.c revision 123312 
1/*
2 * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
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 JOHN BIRRELL 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_sigsuspend.c 123312 2003-12-09 02:20:56Z davidxu $
33 */
34#include <signal.h>
35#include <errno.h>
36#include <pthread.h>
37#include <string.h>
38#include <sys/signalvar.h>
39#include "thr_private.h"
40
41__weak_reference(__sigsuspend, sigsuspend);
42
43int
44_sigsuspend(const sigset_t *set)
45{
46	struct pthread	*curthread = _get_curthread();
47	sigset_t	oldmask, newmask;
48	int             ret = -1;
49
50	if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM)
51		return (__sys_sigsuspend(set));
52
53	/* Check if a new signal set was provided by the caller: */
54	if (set != NULL) {
55		newmask = *set;
56		SIG_CANTMASK(newmask);
57
58		THR_LOCK_SWITCH(curthread);
59
60		/* Save current sigmask */
61		memcpy(&oldmask, &curthread->sigmask, sizeof(sigset_t));
62
63		/* Change the caller's mask: */
64		memcpy(&curthread->sigmask, &newmask, sizeof(sigset_t));
65
66		THR_SET_STATE(curthread, PS_SIGSUSPEND);
67
68		/* Wait for a signal: */
69		_thr_sched_switch_unlocked(curthread);
70
71		/* Always return an interrupted error: */
72		errno = EINTR;
73
74		THR_SCHED_LOCK(curthread, curthread);
75		/* Restore the signal mask: */
76		memcpy(&curthread->sigmask, &oldmask, sizeof(sigset_t));
77		THR_SCHED_UNLOCK(curthread, curthread);
78		/*
79		 * signal mask is reloaded, need to check if there is
80		 * pending proc signal I can handle.
81		 */
82		_thr_sig_check_pending(curthread);
83	} else {
84		/* Return an invalid argument error: */
85		errno = EINVAL;
86	}
87
88	/* Return the completion status: */
89	return (ret);
90}
91
92int
93__sigsuspend(const sigset_t * set)
94{
95	struct pthread *curthread = _get_curthread();
96	int		ret;
97
98	_thr_cancel_enter(curthread);
99	ret = _sigsuspend(set);
100	_thr_cancel_leave(curthread, 1);
101
102	return (ret);
103}
104