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 _thr_suspend_all_lock(struct pthread *curthread)
77 THR_LOCK_ACQUIRE(curthread, &_suspend_all_lock);
78 while (_single_thread != NULL) {
79 old = _suspend_all_cycle;
80 _suspend_all_waiters++;
81 THR_LOCK_RELEASE(curthread, &_suspend_all_lock);
82 _thr_umtx_wait_uint(&_suspend_all_cycle, old, NULL, 0);
83 THR_LOCK_ACQUIRE(curthread, &_suspend_all_lock);
84 _suspend_all_waiters--;
86 _single_thread = curthread;
87 THR_LOCK_RELEASE(curthread, &_suspend_all_lock);
91 _thr_suspend_all_unlock(struct pthread *curthread)
94 THR_LOCK_ACQUIRE(curthread, &_suspend_all_lock);
95 _single_thread = NULL;
96 if (_suspend_all_waiters != 0) {
98 _thr_umtx_wake(&_suspend_all_cycle, INT_MAX, 0);
100 THR_LOCK_RELEASE(curthread, &_suspend_all_lock);
104 _pthread_suspend_all_np(void)
106 struct pthread *curthread = _get_curthread();
107 struct pthread *thread;
111 old_nocancel = curthread->no_cancel;
112 curthread->no_cancel = 1;
113 _thr_suspend_all_lock(curthread);
114 THREAD_LIST_RDLOCK(curthread);
115 TAILQ_FOREACH(thread, &_thread_list, tle) {
116 if (thread != curthread) {
117 THR_THREAD_LOCK(curthread, thread);
118 if (thread->state != PS_DEAD &&
119 !(thread->flags & THR_FLAGS_SUSPENDED))
120 thread->flags |= THR_FLAGS_NEED_SUSPEND;
121 THR_THREAD_UNLOCK(curthread, thread);
124 thr_kill(-1, SIGCANCEL);
127 TAILQ_FOREACH(thread, &_thread_list, tle) {
128 if (thread != curthread) {
129 /* First try to suspend the thread without waiting */
130 THR_THREAD_LOCK(curthread, thread);
131 ret = suspend_common(curthread, thread, 0);
133 THREAD_LIST_UNLOCK(curthread);
134 /* Can not suspend, try to wait */
135 THR_REF_ADD(curthread, thread);
136 suspend_common(curthread, thread, 1);
137 THR_REF_DEL(curthread, thread);
138 _thr_try_gc(curthread, thread);
139 /* thread lock released */
141 THREAD_LIST_RDLOCK(curthread);
143 * Because we were blocked, things may have
144 * been changed, we have to restart the
149 THR_THREAD_UNLOCK(curthread, thread);
152 THREAD_LIST_UNLOCK(curthread);
153 _thr_suspend_all_unlock(curthread);
154 curthread->no_cancel = old_nocancel;
155 _thr_testcancel(curthread);
159 suspend_common(struct pthread *curthread, struct pthread *thread,
164 while (thread->state != PS_DEAD &&
165 !(thread->flags & THR_FLAGS_SUSPENDED)) {
166 thread->flags |= THR_FLAGS_NEED_SUSPEND;
167 /* Thread is in creation. */
168 if (thread->tid == TID_TERMINATED)
171 _thr_send_sig(thread, SIGCANCEL);
172 THR_THREAD_UNLOCK(curthread, thread);
174 _thr_umtx_wait_uint(&thread->cycle, tmp, NULL, 0);
175 THR_THREAD_LOCK(curthread, thread);
177 THR_THREAD_LOCK(curthread, thread);