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33574c17 | 1 | /* Detach a thread. |
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 | /* Indicate that the storage for THREAD can be reclaimed when it | |
26 | terminates. */ | |
27 | int | |
f6fb29d2 | 28 | __pthread_detach (pthread_t thread) |
33574c17 ST |
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 | ||
40 | switch (pthread->state) | |
41 | { | |
42 | case PTHREAD_JOINABLE: | |
43 | /* THREAD still running. Mark it as detached such that its | |
44 | resources can be reclaimed as soon as the thread exits. */ | |
45 | pthread->state = PTHREAD_DETACHED; | |
46 | ||
47 | /* Broadcast the condition. This will make threads that are | |
48 | waiting to join THREAD continue with hopefully disastrous | |
49 | consequences instead of blocking indefinitely. */ | |
f6fb29d2 | 50 | __pthread_cond_broadcast (&pthread->state_cond); |
33574c17 ST |
51 | __pthread_mutex_unlock (&pthread->state_lock); |
52 | ||
53 | __pthread_dealloc (pthread); | |
54 | break; | |
55 | ||
56 | case PTHREAD_EXITED: | |
57 | __pthread_mutex_unlock (&pthread->state_lock); | |
58 | ||
59 | /* THREAD has already exited. PTHREAD remained after the thread | |
60 | exited in order to provide the exit status, but it turns out | |
61 | it won't be needed. */ | |
62 | __pthread_dealloc (pthread); | |
63 | break; | |
64 | ||
33574c17 ST |
65 | default: |
66 | /* Thou shalt not detach non-joinable threads! */ | |
67 | __pthread_mutex_unlock (&pthread->state_lock); | |
68 | err = EINVAL; | |
69 | break; | |
70 | } | |
71 | ||
72 | return err; | |
73 | } | |
fba7fc5a | 74 | weak_alias (__pthread_detach, pthread_detach) |
7c331116 | 75 | hidden_def (__pthread_detach) |