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 */
30
31 #include "namespace.h"
32 #include <machine/tls.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 static void resume_common(pthread_t thread);
41
42 /* Resume a thread: */
43 int
_pthread_resume_np(pthread_t thread)44 _pthread_resume_np(pthread_t thread)
45 {
46 pthread_t curthread = tls_get_curthread();
47 int ret;
48
49 /* Add a reference to the thread: */
50 if ((ret = _thr_ref_add(curthread, thread, /*include dead*/0)) == 0) {
51 /* Lock the threads scheduling queue: */
52 THR_THREAD_LOCK(curthread, thread);
53 resume_common(thread);
54 THR_THREAD_UNLOCK(curthread, thread);
55 _thr_ref_delete(curthread, thread);
56 }
57 return (ret);
58 }
59
60 void
_pthread_resume_all_np(void)61 _pthread_resume_all_np(void)
62 {
63 pthread_t curthread = tls_get_curthread();
64 pthread_t thread;
65
66 /* Take the thread list lock: */
67 THREAD_LIST_LOCK(curthread);
68
69 TAILQ_FOREACH(thread, &_thread_list, tle) {
70 if (thread != curthread) {
71 THR_THREAD_LOCK(curthread, thread);
72 resume_common(thread);
73 THR_THREAD_UNLOCK(curthread, thread);
74 }
75 }
76
77 /* Release the thread list lock: */
78 THREAD_LIST_UNLOCK(curthread);
79 }
80
81 static void
resume_common(pthread_t thread)82 resume_common(pthread_t thread)
83 {
84 /* Clear the suspend flag: */
85 thread->flags &= ~THR_FLAGS_NEED_SUSPEND;
86 thread->cycle++;
87 _thr_umtx_wake(&thread->cycle, 1);
88 }
89
90 __strong_reference(_pthread_resume_np, pthread_resume_np);
91 __strong_reference(_pthread_resume_all_np, pthread_resume_all_np);
92