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33574c17 | 1 | /* Wait for thread termination. |
6d7e8eda | 2 | Copyright (C) 2000-2023 Free Software Foundation, Inc. |
33574c17 ST |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
ad2b41bf ST |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
33574c17 ST |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
ad2b41bf | 13 | Lesser General Public License for more details. |
33574c17 | 14 | |
ad2b41bf ST |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
33574c17 ST |
18 | |
19 | #include <errno.h> | |
20 | #include <pthread.h> | |
21 | #include <stddef.h> | |
22 | ||
23 | #include <pt-internal.h> | |
24 | ||
25 | /* Make calling thread wait for termination of thread THREAD. Return | |
26 | the exit status of the thread in *STATUS. */ | |
28cada04 ST |
27 | static int |
28 | __pthread_join_common (pthread_t thread, void **status, int try, | |
29 | clockid_t clockid, | |
30 | const struct timespec *abstime) | |
33574c17 ST |
31 | { |
32 | struct __pthread *pthread; | |
33 | int err = 0; | |
34 | ||
35 | /* Lookup the thread structure for THREAD. */ | |
36 | pthread = __pthread_getid (thread); | |
37 | if (pthread == NULL) | |
38 | return ESRCH; | |
39 | ||
1433e270 ST |
40 | if (pthread == _pthread_self ()) |
41 | return EDEADLK; | |
42 | ||
33574c17 | 43 | __pthread_mutex_lock (&pthread->state_lock); |
33574c17 | 44 | |
28cada04 ST |
45 | if (try == 0) |
46 | { | |
47 | pthread_cleanup_push ((void (*)(void *)) __pthread_mutex_unlock, | |
48 | &pthread->state_lock); | |
33574c17 | 49 | |
28cada04 ST |
50 | /* Rely on pthread_cond_wait being a cancellation point to make |
51 | pthread_join one too. */ | |
52 | while (pthread->state == PTHREAD_JOINABLE && err != ETIMEDOUT) | |
53 | err = __pthread_cond_clockwait (&pthread->state_cond, | |
54 | &pthread->state_lock, | |
55 | clockid, abstime); | |
56 | ||
57 | pthread_cleanup_pop (0); | |
58 | } | |
33574c17 ST |
59 | |
60 | switch (pthread->state) | |
61 | { | |
28cada04 ST |
62 | case PTHREAD_JOINABLE: |
63 | __pthread_mutex_unlock (&pthread->state_lock); | |
64 | if (err != ETIMEDOUT) | |
65 | err = EBUSY; | |
66 | break; | |
67 | ||
33574c17 ST |
68 | case PTHREAD_EXITED: |
69 | /* THREAD has already exited. Salvage its exit status. */ | |
70 | if (status != NULL) | |
71 | *status = pthread->status; | |
72 | ||
73 | __pthread_mutex_unlock (&pthread->state_lock); | |
74 | ||
75 | __pthread_dealloc (pthread); | |
76 | break; | |
77 | ||
33574c17 ST |
78 | default: |
79 | /* Thou shalt not join non-joinable threads! */ | |
80 | __pthread_mutex_unlock (&pthread->state_lock); | |
81 | err = EINVAL; | |
82 | break; | |
83 | } | |
84 | ||
85 | return err; | |
86 | } | |
28cada04 ST |
87 | |
88 | int | |
89 | __pthread_join (pthread_t thread, void **status) | |
90 | { | |
91 | return __pthread_join_common (thread, status, 0, CLOCK_REALTIME, NULL); | |
92 | } | |
fba7fc5a | 93 | weak_alias (__pthread_join, pthread_join); |
28cada04 ST |
94 | |
95 | int | |
96 | __pthread_tryjoin_np (pthread_t thread, void **status) | |
97 | { | |
98 | return __pthread_join_common (thread, status, 1, CLOCK_REALTIME, NULL); | |
99 | } | |
100 | weak_alias (__pthread_tryjoin_np, pthread_tryjoin_np); | |
101 | ||
102 | int | |
103 | __pthread_timedjoin_np (pthread_t thread, void **status, | |
104 | const struct timespec *abstime) | |
105 | { | |
106 | return __pthread_join_common (thread, status, 0, CLOCK_REALTIME, abstime); | |
107 | } | |
108 | weak_alias (__pthread_timedjoin_np, pthread_timedjoin_np); | |
109 | ||
110 | int | |
111 | __pthread_clockjoin_np (pthread_t thread, void **status, | |
112 | clockid_t clockid, | |
113 | const struct timespec *abstime) | |
114 | { | |
115 | return __pthread_join_common (thread, status, 0, clockid, abstime); | |
116 | } | |
117 | weak_alias (__pthread_clockjoin_np, pthread_clockjoin_np); |