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2b778ceb | 1 | /* Copyright (C) 2002-2021 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 <setjmp.h> | |
19 | #include <stdlib.h> | |
20 | #include "pthreadP.h" | |
a2f0363f | 21 | #include <futex-internal.h> |
76a50749 UD |
22 | |
23 | ||
bdb04f92 UD |
24 | /* The next two functions are similar to pthread_setcanceltype() but |
25 | more specialized for the use in the cancelable functions like write(). | |
676b2f20 CD |
26 | They do not need to check parameters etc. These functions must be |
27 | AS-safe, with the exception of the actual cancellation, because they | |
28 | are called by wrappers around AS-safe functions like write().*/ | |
bdb04f92 | 29 | int |
bdb04f92 UD |
30 | __pthread_enable_asynccancel (void) |
31 | { | |
32 | struct pthread *self = THREAD_SELF; | |
bdb04f92 | 33 | |
8c1c0aae AZ |
34 | int oldval = THREAD_GETMEM (self, canceltype); |
35 | THREAD_SETMEM (self, canceltype, PTHREAD_CANCEL_ASYNCHRONOUS); | |
bdb04f92 | 36 | |
8c1c0aae | 37 | int ch = THREAD_GETMEM (self, cancelhandling); |
b22d701b | 38 | |
8c1c0aae AZ |
39 | if (self->cancelstate == PTHREAD_CANCEL_ENABLE |
40 | && (ch & CANCELED_BITMASK) | |
41 | && !(ch & EXITING_BITMASK) | |
42 | && !(ch & TERMINATED_BITMASK)) | |
43 | { | |
44 | THREAD_SETMEM (self, result, PTHREAD_CANCELED); | |
45 | __do_cancel (); | |
bdb04f92 UD |
46 | } |
47 | ||
48 | return oldval; | |
49 | } | |
ce0b7961 | 50 | libc_hidden_def (__pthread_enable_asynccancel) |
bdb04f92 | 51 | |
676b2f20 CD |
52 | /* See the comment for __pthread_enable_asynccancel regarding |
53 | the AS-safety of this function. */ | |
bdb04f92 | 54 | void |
bdb04f92 UD |
55 | __pthread_disable_asynccancel (int oldtype) |
56 | { | |
57 | /* If asynchronous cancellation was enabled before we do not have | |
58 | anything to do. */ | |
8c1c0aae | 59 | if (oldtype == PTHREAD_CANCEL_ASYNCHRONOUS) |
bdb04f92 UD |
60 | return; |
61 | ||
62 | struct pthread *self = THREAD_SELF; | |
8c1c0aae | 63 | self->canceltype = PTHREAD_CANCEL_DEFERRED; |
bdb04f92 | 64 | } |
ce0b7961 | 65 | libc_hidden_def (__pthread_disable_asynccancel) |