1 | /* Cancel a thread. |
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2 | Copyright (C) 2002-2022 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 |
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. |
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 |
13 | Lesser General Public License for more details. |
14 | |
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 | <https://www.gnu.org/licenses/>. */ |
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 (thread: 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 | } |
63 |