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dff8da6b | 1 | /* Copyright (C) 2002-2024 Free Software Foundation, Inc. |
76a50749 | 2 | This file is part of the GNU C Library. |
76a50749 UD |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
76a50749 UD |
17 | |
18 | #include <errno.h> | |
19 | #include "pthreadP.h" | |
20 | #include <atomic.h> | |
21 | ||
22 | ||
23 | int | |
9d46370c | 24 | __pthread_setcanceltype (int type, int *oldtype) |
76a50749 | 25 | { |
76a50749 UD |
26 | if (type < PTHREAD_CANCEL_DEFERRED || type > PTHREAD_CANCEL_ASYNCHRONOUS) |
27 | return EINVAL; | |
28 | ||
2f531bbb | 29 | volatile struct pthread *self = THREAD_SELF; |
76a50749 | 30 | |
40465600 AZ |
31 | int oldval = atomic_load_relaxed (&self->cancelhandling); |
32 | while (1) | |
33 | { | |
34 | int newval = (type == PTHREAD_CANCEL_ASYNCHRONOUS | |
35 | ? oldval | CANCELTYPE_BITMASK | |
36 | : oldval & ~CANCELTYPE_BITMASK); | |
37 | ||
38 | if (oldtype != NULL) | |
39 | *oldtype = ((oldval & CANCELTYPE_BITMASK) | |
40 | ? PTHREAD_CANCEL_ASYNCHRONOUS : PTHREAD_CANCEL_DEFERRED); | |
41 | ||
42 | if (oldval == newval) | |
43 | break; | |
44 | ||
45 | if (atomic_compare_exchange_weak_acquire (&self->cancelhandling, | |
46 | &oldval, newval)) | |
47 | { | |
48 | if (cancel_enabled_and_canceled_and_async (newval)) | |
49 | { | |
50 | THREAD_SETMEM (self, result, PTHREAD_CANCELED); | |
51 | __do_cancel (); | |
52 | } | |
53 | ||
54 | break; | |
55 | } | |
56 | } | |
76a50749 UD |
57 | |
58 | return 0; | |
59 | } | |
75376a3f FW |
60 | libc_hidden_def (__pthread_setcanceltype) |
61 | weak_alias (__pthread_setcanceltype, pthread_setcanceltype) |