1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the author nor the names of any co-contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
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(_thr_resume_all_np, pthread_resume_all_np);
42 __weak_reference(_thr_resume_all_np, _pthread_resume_all_np);
43
44 static void resume_common(struct pthread *thread);
45
46 /* Resume a thread: */
47 int
_pthread_resume_np(pthread_t thread)48 _pthread_resume_np(pthread_t thread)
49 {
50 struct pthread *curthread = _get_curthread();
51 int ret;
52
53 /* Add a reference to the thread: */
54 if ((ret = _thr_find_thread(curthread, thread, /*include dead*/0)) == 0) {
55 /* Lock the threads scheduling queue: */
56 resume_common(thread);
57 THR_THREAD_UNLOCK(curthread, thread);
58 }
59 return (ret);
60 }
61
62 void
_thr_resume_all_np(void)63 _thr_resume_all_np(void)
64 {
65 struct pthread *curthread = _get_curthread();
66 struct pthread *thread;
67 int old_nocancel;
68
69 old_nocancel = curthread->no_cancel;
70 curthread->no_cancel = 1;
71 _thr_suspend_all_lock(curthread);
72 /* Take the thread list lock: */
73 THREAD_LIST_RDLOCK(curthread);
74
75 TAILQ_FOREACH(thread, &_thread_list, tle) {
76 if (thread != curthread) {
77 THR_THREAD_LOCK(curthread, thread);
78 resume_common(thread);
79 THR_THREAD_UNLOCK(curthread, thread);
80 }
81 }
82
83 /* Release the thread list lock: */
84 THREAD_LIST_UNLOCK(curthread);
85 _thr_suspend_all_unlock(curthread);
86 curthread->no_cancel = old_nocancel;
87 _thr_testcancel(curthread);
88 }
89
90 static void
resume_common(struct pthread * thread)91 resume_common(struct pthread *thread)
92 {
93 /* Clear the suspend flag: */
94 thread->flags &= ~(THR_FLAGS_NEED_SUSPEND | THR_FLAGS_SUSPENDED);
95 thread->cycle++;
96 _thr_umtx_wake(&thread->cycle, 1, 0);
97 }
98