Cleanup the TLS implementation:
[dragonfly.git] / lib / libthread_xu / thread / thr_suspend_np.c
CommitLineData
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1/*
2 * Copyright (c) 1995-1998 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: src/lib/libpthread/thread/thr_suspend_np.c,v 1.19 2003/05/04 16:17:01 deischen Exp $
9e2ee207 33 * $DragonFly: src/lib/libthread_xu/thread/thr_suspend_np.c,v 1.2 2005/03/29 19:26:20 joerg Exp $
71b3fa15 34 */
9e2ee207
JS
35
36#include <machine/tls.h>
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37#include <errno.h>
38#include <pthread.h>
39#include "thr_private.h"
40
41static void suspend_common(struct pthread *thread);
42
43__weak_reference(_pthread_suspend_np, pthread_suspend_np);
44__weak_reference(_pthread_suspend_all_np, pthread_suspend_all_np);
45
46/* Suspend a thread: */
47int
48_pthread_suspend_np(pthread_t thread)
49{
9e2ee207 50 struct pthread *curthread = tls_get_curthread();
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51 int ret;
52
53 /* Suspending the current thread doesn't make sense. */
9e2ee207 54 if (thread == curthread)
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55 ret = EDEADLK;
56
57 /* Add a reference to the thread: */
58 else if ((ret = _thr_ref_add(curthread, thread, /*include dead*/0))
59 == 0) {
60 /* Lock the threads scheduling queue: */
61 THR_THREAD_LOCK(curthread, thread);
62 suspend_common(thread);
63 /* Unlock the threads scheduling queue: */
64 THR_THREAD_UNLOCK(curthread, thread);
65
66 /* Don't forget to remove the reference: */
67 _thr_ref_delete(curthread, thread);
68 }
69 return (ret);
70}
71
72void
73_pthread_suspend_all_np(void)
74{
9e2ee207 75 struct pthread *curthread = tls_get_curthread();
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76 struct pthread *thread;
77
78 /* Take the thread list lock: */
79 THREAD_LIST_LOCK(curthread);
80
81 TAILQ_FOREACH(thread, &_thread_list, tle) {
82 if (thread != curthread) {
83 THR_THREAD_LOCK(curthread, thread);
84 suspend_common(thread);
85 THR_THREAD_UNLOCK(curthread, thread);
86 }
87 }
88
89 /* Release the thread list lock: */
90 THREAD_LIST_UNLOCK(curthread);
91}
92
93static void
94suspend_common(struct pthread *thread)
95{
96 if (thread->state != PS_DEAD) {
97 thread->flags |= THR_FLAGS_NEED_SUSPEND;
98 _thr_send_sig(thread, SIGCANCEL);
99 }
100}