1/* Copyright (C) 2002-2021 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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 <setjmp.h>
20#include <stdlib.h>
21#include "pthreadP.h"
22#include <futex-internal.h>
23
24
25/* The next two functions are similar to pthread_setcanceltype() but
26 more specialized for the use in the cancelable functions like write().
27 They do not need to check parameters etc. These functions must be
28 AS-safe, with the exception of the actual cancellation, because they
29 are called by wrappers around AS-safe functions like write().*/
30int
31__pthread_enable_asynccancel (void)
32{
33 struct pthread *self = THREAD_SELF;
34
35 int oldval = THREAD_GETMEM (self, canceltype);
36 THREAD_SETMEM (self, canceltype, PTHREAD_CANCEL_ASYNCHRONOUS);
37
38 int ch = THREAD_GETMEM (self, cancelhandling);
39
40 if (self->cancelstate == PTHREAD_CANCEL_ENABLE
41 && (ch & CANCELED_BITMASK)
42 && !(ch & EXITING_BITMASK)
43 && !(ch & TERMINATED_BITMASK))
44 {
45 THREAD_SETMEM (self, result, PTHREAD_CANCELED);
46 __do_cancel ();
47 }
48
49 return oldval;
50}
51libc_hidden_def (__pthread_enable_asynccancel)
52
53/* See the comment for __pthread_enable_asynccancel regarding
54 the AS-safety of this function. */
55void
56__pthread_disable_asynccancel (int oldtype)
57{
58 /* If asynchronous cancellation was enabled before we do not have
59 anything to do. */
60 if (oldtype == PTHREAD_CANCEL_ASYNCHRONOUS)
61 return;
62
63 struct pthread *self = THREAD_SELF;
64 self->canceltype = PTHREAD_CANCEL_DEFERRED;
65}
66libc_hidden_def (__pthread_disable_asynccancel)
67