2 * Copyright (c) 1995-1998 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. Neither the name of the author nor the names of any co-contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include "namespace.h"
35 #include <pthread_np.h>
36 #include "un-namespace.h"
38 #include "thr_private.h"
40 static int suspend_common(struct pthread *, struct pthread *,
43 __weak_reference(_pthread_suspend_np, pthread_suspend_np);
44 __weak_reference(_pthread_suspend_all_np, pthread_suspend_all_np);
46 /* Suspend a thread: */
48 _pthread_suspend_np(pthread_t thread)
50 struct pthread *curthread = _get_curthread();
53 /* Suspending the current thread doesn't make sense. */
54 if (thread == _get_curthread())
57 /* Add a reference to the thread: */
58 else if ((ret = _thr_ref_add(curthread, thread, /*include dead*/0))
60 /* Lock the threads scheduling queue: */
61 THR_THREAD_LOCK(curthread, thread);
62 suspend_common(curthread, thread, 1);
63 /* Unlock the threads scheduling queue: */
64 THR_THREAD_UNLOCK(curthread, thread);
66 /* Don't forget to remove the reference: */
67 _thr_ref_delete(curthread, thread);
73 _pthread_suspend_all_np(void)
75 struct pthread *curthread = _get_curthread();
76 struct pthread *thread;
79 THREAD_LIST_LOCK(curthread);
81 TAILQ_FOREACH(thread, &_thread_list, tle) {
82 if (thread != curthread) {
83 THR_THREAD_LOCK(curthread, thread);
84 if (thread->state != PS_DEAD &&
85 !(thread->flags & THR_FLAGS_SUSPENDED))
86 thread->flags |= THR_FLAGS_NEED_SUSPEND;
87 THR_THREAD_UNLOCK(curthread, thread);
90 thr_kill(-1, SIGCANCEL);
93 TAILQ_FOREACH(thread, &_thread_list, tle) {
94 if (thread != curthread) {
95 /* First try to suspend the thread without waiting */
96 THR_THREAD_LOCK(curthread, thread);
97 ret = suspend_common(curthread, thread, 0);
99 /* Can not suspend, try to wait */
101 THREAD_LIST_UNLOCK(curthread);
102 suspend_common(curthread, thread, 1);
103 THR_THREAD_UNLOCK(curthread, thread);
104 THREAD_LIST_LOCK(curthread);
105 _thr_ref_delete_unlocked(curthread, thread);
107 * Because we were blocked, things may have
108 * been changed, we have to restart the
113 THR_THREAD_UNLOCK(curthread, thread);
117 THREAD_LIST_UNLOCK(curthread);
121 suspend_common(struct pthread *curthread, struct pthread *thread,
126 while (thread->state != PS_DEAD &&
127 !(thread->flags & THR_FLAGS_SUSPENDED)) {
128 thread->flags |= THR_FLAGS_NEED_SUSPEND;
130 THR_THREAD_UNLOCK(curthread, thread);
131 _thr_send_sig(thread, SIGCANCEL);
133 _thr_umtx_wait_uint(&thread->cycle, tmp, NULL, 0);
134 THR_THREAD_LOCK(curthread, thread);
136 THR_THREAD_LOCK(curthread, thread);