1 /*
2 * Copyright (c) 1995 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. 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.
16 *
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
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD$
30 */
31
32 #include "namespace.h"
33 #include <errno.h>
34 #include <pthread.h>
35 #include <pthread_np.h>
36 #include "un-namespace.h"
37
38 #include "thr_private.h"
39
40 __weak_reference(_pthread_resume_np, pthread_resume_np);
41 __weak_reference(_pthread_resume_all_np, pthread_resume_all_np);
42
43 static void resume_common(struct pthread *thread);
44
45 /* Resume a thread: */
46 int
_pthread_resume_np(pthread_t thread)47 _pthread_resume_np(pthread_t thread)
48 {
49 struct pthread *curthread = _get_curthread();
50 int ret;
51
52 /* Add a reference to the thread: */
53 if ((ret = _thr_find_thread(curthread, thread, /*include dead*/0)) == 0) {
54 /* Lock the threads scheduling queue: */
55 resume_common(thread);
56 THR_THREAD_UNLOCK(curthread, thread);
57 }
58 return (ret);
59 }
60
61 void
_pthread_resume_all_np(void)62 _pthread_resume_all_np(void)
63 {
64 struct pthread *curthread = _get_curthread();
65 struct pthread *thread;
66 int old_nocancel;
67
68 old_nocancel = curthread->no_cancel;
69 curthread->no_cancel = 1;
70 _thr_suspend_all_lock(curthread);
71 /* Take the thread list lock: */
72 THREAD_LIST_RDLOCK(curthread);
73
74 TAILQ_FOREACH(thread, &_thread_list, tle) {
75 if (thread != curthread) {
76 THR_THREAD_LOCK(curthread, thread);
77 resume_common(thread);
78 THR_THREAD_UNLOCK(curthread, thread);
79 }
80 }
81
82 /* Release the thread list lock: */
83 THREAD_LIST_UNLOCK(curthread);
84 _thr_suspend_all_unlock(curthread);
85 curthread->no_cancel = old_nocancel;
86 _thr_testcancel(curthread);
87 }
88
89 static void
resume_common(struct pthread * thread)90 resume_common(struct pthread *thread)
91 {
92 /* Clear the suspend flag: */
93 thread->flags &= ~THR_FLAGS_NEED_SUSPEND;
94 thread->cycle++;
95 _thr_umtx_wake(&thread->cycle, 1, 0);
96 }
97