1/*
2 * Copyright (c) 2005, David Xu <davidxu@freebsd.org>
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 unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
| 1/*
2 * Copyright (c) 2005, David Xu <davidxu@freebsd.org>
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 unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
|
26 * $FreeBSD: head/lib/libthr/thread/thr_join.c 164715 2006-11-28 11:05:31Z davidxu $
| 26 * $FreeBSD: head/lib/libthr/thread/thr_join.c 211524 2010-08-20 05:15:39Z davidxu $
|
27 *
28 */
29
30#include "namespace.h"
31#include <errno.h>
32#include <pthread.h>
33#include "un-namespace.h"
34
35#include "thr_private.h"
36
37int _pthread_timedjoin_np(pthread_t pthread, void **thread_return,
38 const struct timespec *abstime);
39static int join_common(pthread_t, void **, const struct timespec *);
40
41__weak_reference(_pthread_join, pthread_join);
42__weak_reference(_pthread_timedjoin_np, pthread_timedjoin_np);
43
44static void backout_join(void *arg)
45{
46 struct pthread *curthread = _get_curthread();
47 struct pthread *pthread = (struct pthread *)arg;
48
49 THREAD_LIST_LOCK(curthread);
50 pthread->joiner = NULL;
51 THREAD_LIST_UNLOCK(curthread);
52}
53
54int
55_pthread_join(pthread_t pthread, void **thread_return)
56{
57 return (join_common(pthread, thread_return, NULL));
58}
59
60int
61_pthread_timedjoin_np(pthread_t pthread, void **thread_return,
62 const struct timespec *abstime)
63{
64 if (abstime == NULL || abstime->tv_sec < 0 || abstime->tv_nsec < 0 ||
65 abstime->tv_nsec >= 1000000000)
66 return (EINVAL);
67
68 return (join_common(pthread, thread_return, abstime));
69}
70
| 27 *
28 */
29
30#include "namespace.h"
31#include <errno.h>
32#include <pthread.h>
33#include "un-namespace.h"
34
35#include "thr_private.h"
36
37int _pthread_timedjoin_np(pthread_t pthread, void **thread_return,
38 const struct timespec *abstime);
39static int join_common(pthread_t, void **, const struct timespec *);
40
41__weak_reference(_pthread_join, pthread_join);
42__weak_reference(_pthread_timedjoin_np, pthread_timedjoin_np);
43
44static void backout_join(void *arg)
45{
46 struct pthread *curthread = _get_curthread();
47 struct pthread *pthread = (struct pthread *)arg;
48
49 THREAD_LIST_LOCK(curthread);
50 pthread->joiner = NULL;
51 THREAD_LIST_UNLOCK(curthread);
52}
53
54int
55_pthread_join(pthread_t pthread, void **thread_return)
56{
57 return (join_common(pthread, thread_return, NULL));
58}
59
60int
61_pthread_timedjoin_np(pthread_t pthread, void **thread_return,
62 const struct timespec *abstime)
63{
64 if (abstime == NULL || abstime->tv_sec < 0 || abstime->tv_nsec < 0 ||
65 abstime->tv_nsec >= 1000000000)
66 return (EINVAL);
67
68 return (join_common(pthread, thread_return, abstime));
69}
70
|
| 71/*
72 * Cancellation behavior:
73 * if the thread is canceled, joinee is not recycled.
74 */
|
71static int
72join_common(pthread_t pthread, void **thread_return,
73 const struct timespec *abstime)
74{
75 struct pthread *curthread = _get_curthread();
76 struct timespec ts, ts2, *tsp;
77 void *tmp;
78 long tid;
79 int ret = 0;
80
81 if (pthread == NULL)
82 return (EINVAL);
83
84 if (pthread == curthread)
85 return (EDEADLK);
86
87 THREAD_LIST_LOCK(curthread);
88 if ((ret = _thr_find_thread(curthread, pthread, 1)) != 0) {
89 ret = ESRCH;
90 } else if ((pthread->tlflags & TLFLAGS_DETACHED) != 0) {
91 ret = EINVAL;
92 } else if (pthread->joiner != NULL) {
93 /* Multiple joiners are not supported. */
94 ret = ENOTSUP;
95 }
96 if (ret) {
97 THREAD_LIST_UNLOCK(curthread);
98 return (ret);
99 }
100 /* Set the running thread to be the joiner: */
101 pthread->joiner = curthread;
102
103 THREAD_LIST_UNLOCK(curthread);
104
105 THR_CLEANUP_PUSH(curthread, backout_join, pthread);
| 75static int
76join_common(pthread_t pthread, void **thread_return,
77 const struct timespec *abstime)
78{
79 struct pthread *curthread = _get_curthread();
80 struct timespec ts, ts2, *tsp;
81 void *tmp;
82 long tid;
83 int ret = 0;
84
85 if (pthread == NULL)
86 return (EINVAL);
87
88 if (pthread == curthread)
89 return (EDEADLK);
90
91 THREAD_LIST_LOCK(curthread);
92 if ((ret = _thr_find_thread(curthread, pthread, 1)) != 0) {
93 ret = ESRCH;
94 } else if ((pthread->tlflags & TLFLAGS_DETACHED) != 0) {
95 ret = EINVAL;
96 } else if (pthread->joiner != NULL) {
97 /* Multiple joiners are not supported. */
98 ret = ENOTSUP;
99 }
100 if (ret) {
101 THREAD_LIST_UNLOCK(curthread);
102 return (ret);
103 }
104 /* Set the running thread to be the joiner: */
105 pthread->joiner = curthread;
106
107 THREAD_LIST_UNLOCK(curthread);
108
109 THR_CLEANUP_PUSH(curthread, backout_join, pthread);
|
106 _thr_cancel_enter(curthread);
| 110 _thr_cancel_enter_defer(curthread, 1);
|
107
108 tid = pthread->tid;
109 while (pthread->tid != TID_TERMINATED) {
| 111
112 tid = pthread->tid;
113 while (pthread->tid != TID_TERMINATED) {
|
| 114 _thr_testcancel(curthread);
|
110 if (abstime != NULL) {
111 clock_gettime(CLOCK_REALTIME, &ts);
112 TIMESPEC_SUB(&ts2, abstime, &ts);
113 if (ts2.tv_sec < 0) {
114 ret = ETIMEDOUT;
115 break;
116 }
117 tsp = &ts2;
118 } else
119 tsp = NULL;
120 ret = _thr_umtx_wait(&pthread->tid, tid, tsp);
121 if (ret == ETIMEDOUT)
122 break;
123 }
124
| 115 if (abstime != NULL) {
116 clock_gettime(CLOCK_REALTIME, &ts);
117 TIMESPEC_SUB(&ts2, abstime, &ts);
118 if (ts2.tv_sec < 0) {
119 ret = ETIMEDOUT;
120 break;
121 }
122 tsp = &ts2;
123 } else
124 tsp = NULL;
125 ret = _thr_umtx_wait(&pthread->tid, tid, tsp);
126 if (ret == ETIMEDOUT)
127 break;
128 }
129
|
125 _thr_cancel_leave(curthread);
| 130 _thr_cancel_leave_defer(curthread, 0);
|
126 THR_CLEANUP_POP(curthread, 0);
127
128 if (ret == ETIMEDOUT) {
129 THREAD_LIST_LOCK(curthread);
130 pthread->joiner = NULL;
131 THREAD_LIST_UNLOCK(curthread);
132 } else {
133 ret = 0;
134 tmp = pthread->ret;
135 THREAD_LIST_LOCK(curthread);
136 pthread->tlflags |= TLFLAGS_DETACHED;
137 pthread->joiner = NULL;
138 THR_GCLIST_ADD(pthread);
139 THREAD_LIST_UNLOCK(curthread);
140
141 if (thread_return != NULL)
142 *thread_return = tmp;
143 }
144 return (ret);
145}
| 131 THR_CLEANUP_POP(curthread, 0);
132
133 if (ret == ETIMEDOUT) {
134 THREAD_LIST_LOCK(curthread);
135 pthread->joiner = NULL;
136 THREAD_LIST_UNLOCK(curthread);
137 } else {
138 ret = 0;
139 tmp = pthread->ret;
140 THREAD_LIST_LOCK(curthread);
141 pthread->tlflags |= TLFLAGS_DETACHED;
142 pthread->joiner = NULL;
143 THR_GCLIST_ADD(pthread);
144 THREAD_LIST_UNLOCK(curthread);
145
146 if (thread_return != NULL)
147 *thread_return = tmp;
148 }
149 return (ret);
150}
|