thr_kill.c revision 54707 
1/*
2 * Copyright (c) 1997 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_kill.c 54707 1999-12-17 00:56:36Z deischen $
33 */
34#include <errno.h>
35#include <signal.h>
36#ifdef _THREAD_SAFE
37#include <pthread.h>
38#include "pthread_private.h"
39
40int
41pthread_kill(pthread_t pthread, int sig)
42{
43	int ret;
44
45	/* Check for invalid signal numbers: */
46	if (sig < 0 || sig >= NSIG)
47		/* Invalid signal: */
48		ret = EINVAL;
49	/*
50	 * Ensure the thread is in the list of active threads, and the
51	 * signal is valid (signal 0 specifies error checking only) and
52	 * not being ignored:
53	 */
54	else if (((ret = _find_thread(pthread)) == 0) && (sig > 0) &&
55	    (_thread_sigact[sig - 1].sa_handler != SIG_IGN)) {
56		/*
57		 * Defer signals to protect the scheduling queues from
58		 * access by the signal handler:
59		 */
60		_thread_kern_sig_defer();
61
62		_thread_sig_send(pthread, sig);
63
64		/*
65		 * Undefer and handle pending signals, yielding if
66		 * necessary:
67		 */
68		_thread_kern_sig_undefer();
69	}
70
71	/* Return the completion status: */
72	return (ret);
73}
74#endif
75