1/* Cancel a thread.
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
23int
24pthread_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

source code of glibc/htl/pt-cancel.c