2 * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
32 * $FreeBSD: src/lib/libc_r/uthread/uthread_sigsuspend.c,v 1.9.2.2 2002/10/22 14:44:03 fjoe Exp $
35 #include <sys/param.h>
36 #include <sys/signalvar.h>
39 #include "pthread_private.h"
42 _sigsuspend(const sigset_t * set)
44 struct pthread *curthread = _get_curthread();
46 sigset_t oset, sigset;
48 /* Check if a new signal set was provided by the caller: */
50 /* Save the current signal mask: */
51 oset = curthread->sigmask;
53 /* Change the caller's mask: */
54 curthread->sigmask = *set;
57 * Check if there are pending signals for the running
58 * thread or process that aren't blocked:
60 sigset = curthread->sigpend;
61 SIGSETOR(sigset, _process_sigpending);
62 SIGSETNAND(sigset, curthread->sigmask);
63 if (SIGNOTEMPTY(sigset)) {
65 * Call the kernel scheduler which will safely
66 * install a signal frame for the running thread:
68 _thread_kern_sched_sig();
70 /* Wait for a signal: */
71 _thread_kern_sched_state(PS_SIGSUSPEND,
75 /* Always return an interrupted error: */
78 /* Restore the signal mask: */
79 curthread->sigmask = oset;
81 /* Return an invalid argument error: */
85 /* Return the completion status: */
90 sigsuspend(const sigset_t * set)
94 _thread_enter_cancellation_point();
95 ret = _sigsuspend(set);
96 _thread_leave_cancellation_point();