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33574c17 ST |
1 | /* Wait for thread termination. |
2 | Copyright (C) 2000-2018 Free Software Foundation, Inc. | |
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 | |
17 | <http://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. */ | |
27 | int | |
28 | pthread_join (pthread_t thread, void **status) | |
29 | { | |
30 | struct __pthread *pthread; | |
31 | int err = 0; | |
32 | ||
33 | /* Lookup the thread structure for THREAD. */ | |
34 | pthread = __pthread_getid (thread); | |
35 | if (pthread == NULL) | |
36 | return ESRCH; | |
37 | ||
38 | __pthread_mutex_lock (&pthread->state_lock); | |
39 | pthread_cleanup_push ((void (*)(void *)) __pthread_mutex_unlock, | |
40 | &pthread->state_lock); | |
41 | ||
42 | /* Rely on pthread_cond_wait being a cancellation point to make | |
43 | pthread_join one too. */ | |
44 | while (pthread->state == PTHREAD_JOINABLE) | |
45 | __pthread_cond_wait (&pthread->state_cond, &pthread->state_lock); | |
46 | ||
47 | pthread_cleanup_pop (0); | |
48 | ||
49 | switch (pthread->state) | |
50 | { | |
51 | case PTHREAD_EXITED: | |
52 | /* THREAD has already exited. Salvage its exit status. */ | |
53 | if (status != NULL) | |
54 | *status = pthread->status; | |
55 | ||
56 | __pthread_mutex_unlock (&pthread->state_lock); | |
57 | ||
58 | __pthread_dealloc (pthread); | |
59 | break; | |
60 | ||
61 | case PTHREAD_TERMINATED: | |
62 | /* Pretend THREAD wasn't there in the first place. */ | |
63 | __pthread_mutex_unlock (&pthread->state_lock); | |
64 | err = ESRCH; | |
65 | break; | |
66 | ||
67 | default: | |
68 | /* Thou shalt not join non-joinable threads! */ | |
69 | __pthread_mutex_unlock (&pthread->state_lock); | |
70 | err = EINVAL; | |
71 | break; | |
72 | } | |
73 | ||
74 | return err; | |
75 | } |