Commit | Line | Data |
---|---|---|
71b3fa15 DX |
1 | /* |
2 | * Copyright (c) 1995-1998 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. | |
d3b15642 | 13 | * 3. Neither the name of the author nor the names of any co-contributors |
71b3fa15 DX |
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 | * | |
71b3fa15 | 29 | */ |
9e2ee207 | 30 | |
fc71f871 | 31 | #include "namespace.h" |
71b3fa15 DX |
32 | #include <errno.h> |
33 | #include <pthread.h> | |
fc71f871 DX |
34 | #include <pthread_np.h> |
35 | #include "un-namespace.h" | |
fd4288bd | 36 | |
71b3fa15 DX |
37 | #include "thr_private.h" |
38 | ||
940be950 | 39 | static int suspend_common(pthread_t, pthread_t, int); |
71b3fa15 | 40 | |
71b3fa15 DX |
41 | /* Suspend a thread: */ |
42 | int | |
43 | _pthread_suspend_np(pthread_t thread) | |
44 | { | |
940be950 | 45 | pthread_t curthread = tls_get_curthread(); |
71b3fa15 DX |
46 | int ret; |
47 | ||
48 | /* Suspending the current thread doesn't make sense. */ | |
9e2ee207 | 49 | if (thread == curthread) |
71b3fa15 DX |
50 | ret = EDEADLK; |
51 | ||
52 | /* Add a reference to the thread: */ | |
53 | else if ((ret = _thr_ref_add(curthread, thread, /*include dead*/0)) | |
54 | == 0) { | |
55 | /* Lock the threads scheduling queue: */ | |
56 | THR_THREAD_LOCK(curthread, thread); | |
fd4288bd | 57 | suspend_common(curthread, thread, 1); |
71b3fa15 DX |
58 | /* Unlock the threads scheduling queue: */ |
59 | THR_THREAD_UNLOCK(curthread, thread); | |
60 | ||
61 | /* Don't forget to remove the reference: */ | |
62 | _thr_ref_delete(curthread, thread); | |
63 | } | |
64 | return (ret); | |
65 | } | |
66 | ||
67 | void | |
68 | _pthread_suspend_all_np(void) | |
69 | { | |
940be950 | 70 | pthread_t curthread = tls_get_curthread(); |
71 | pthread_t thread; | |
fd4288bd | 72 | int ret; |
71b3fa15 | 73 | |
71b3fa15 DX |
74 | THREAD_LIST_LOCK(curthread); |
75 | ||
76 | TAILQ_FOREACH(thread, &_thread_list, tle) { | |
77 | if (thread != curthread) { | |
78 | THR_THREAD_LOCK(curthread, thread); | |
fd4288bd | 79 | if (thread->state != PS_DEAD && |
19451dc5 | 80 | !(thread->flags & THR_FLAGS_SUSPENDED)) |
fd4288bd DX |
81 | thread->flags |= THR_FLAGS_NEED_SUSPEND; |
82 | THR_THREAD_UNLOCK(curthread, thread); | |
83 | } | |
84 | } | |
85 | /* thr_kill(-1, SIGCANCEL); */ | |
86 | ||
87 | restart: | |
88 | TAILQ_FOREACH(thread, &_thread_list, tle) { | |
89 | if (thread != curthread) { | |
90 | /* First try to suspend the thread without waiting */ | |
91 | THR_THREAD_LOCK(curthread, thread); | |
92 | ret = suspend_common(curthread, thread, 0); | |
93 | if (ret == 0) { | |
94 | /* Can not suspend, try to wait */ | |
95 | thread->refcount++; | |
96 | THREAD_LIST_UNLOCK(curthread); | |
97 | suspend_common(curthread, thread, 1); | |
98 | THR_THREAD_UNLOCK(curthread, thread); | |
99 | THREAD_LIST_LOCK(curthread); | |
100 | _thr_ref_delete_unlocked(curthread, thread); | |
101 | /* | |
102 | * Because we were blocked, things may have | |
103 | * been changed, we have to restart the | |
104 | * process. | |
105 | */ | |
106 | goto restart; | |
107 | } | |
71b3fa15 DX |
108 | THR_THREAD_UNLOCK(curthread, thread); |
109 | } | |
110 | } | |
111 | ||
71b3fa15 DX |
112 | THREAD_LIST_UNLOCK(curthread); |
113 | } | |
114 | ||
fd4288bd | 115 | static int |
940be950 | 116 | suspend_common(pthread_t curthread, pthread_t thread, int waitok) |
71b3fa15 | 117 | { |
fd4288bd DX |
118 | umtx_t tmp; |
119 | ||
120 | while (thread->state != PS_DEAD && | |
121 | !(thread->flags & THR_FLAGS_SUSPENDED)) { | |
71b3fa15 | 122 | thread->flags |= THR_FLAGS_NEED_SUSPEND; |
fd4288bd | 123 | tmp = thread->cycle; |
71b3fa15 | 124 | _thr_send_sig(thread, SIGCANCEL); |
5a1048c8 | 125 | THR_THREAD_UNLOCK(curthread, thread); |
fd4288bd DX |
126 | if (waitok) { |
127 | _thr_umtx_wait(&thread->cycle, tmp, NULL, 0); | |
128 | THR_THREAD_LOCK(curthread, thread); | |
129 | } else { | |
130 | THR_THREAD_LOCK(curthread, thread); | |
131 | return (0); | |
132 | } | |
71b3fa15 | 133 | } |
fd4288bd DX |
134 | |
135 | return (1); | |
71b3fa15 | 136 | } |
5a1048c8 DX |
137 | |
138 | __strong_reference(_pthread_suspend_np, pthread_suspend_np); | |
139 | __strong_reference(_pthread_suspend_all_np, pthread_suspend_all_np); |