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33574c17 | 1 | /* Cancel a thread. |
dff8da6b | 2 | Copyright (C) 2002-2024 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 <pthread.h> | |
20 | ||
21 | #include <pt-internal.h> | |
22 | ||
23 | int | |
24 | pthread_cancel (pthread_t t) | |
25 | { | |
26 | int err = 0; | |
27 | struct __pthread *p; | |
28 | ||
29 | p = __pthread_getid (t); | |
30 | if (p == NULL) | |
31 | return ESRCH; | |
32 | ||
33 | __pthread_mutex_lock (&p->cancel_lock); | |
34 | if (p->cancel_pending) | |
35 | { | |
36 | __pthread_mutex_unlock (&p->cancel_lock); | |
37 | return 0; | |
38 | } | |
39 | ||
40 | p->cancel_pending = 1; | |
41 | ||
42 | if (p->cancel_state != PTHREAD_CANCEL_ENABLE) | |
43 | { | |
44 | __pthread_mutex_unlock (&p->cancel_lock); | |
45 | return 0; | |
46 | } | |
47 | ||
48 | if (p->cancel_type == PTHREAD_CANCEL_ASYNCHRONOUS) | |
49 | /* CANCEL_LOCK is unlocked by this call. */ | |
50 | err = __pthread_do_cancel (p); | |
51 | else | |
52 | { | |
53 | if (p->cancel_hook != NULL) | |
54 | /* Thread blocking on a cancellation point. Invoke hook to unblock. | |
55 | See __pthread_cond_timedwait_internal. */ | |
56 | p->cancel_hook (p->cancel_hook_arg); | |
57 | ||
58 | __pthread_mutex_unlock (&p->cancel_lock); | |
59 | } | |
60 | ||
61 | return err; | |
62 | } |