1/* Copyright (C) 2002-2023 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <errno.h>
19#include "pthreadP.h"
20#include <atomic.h>
21#include <libc-lockP.h>
22
23int
24__pthread_setcancelstate (int state, int *oldstate)
25{
26 volatile struct pthread *self;
27
28 if (state < PTHREAD_CANCEL_ENABLE || state > PTHREAD_CANCEL_DISABLE)
29 return EINVAL;
30
31 self = THREAD_SELF;
32
33 int oldval = atomic_load_relaxed (&self->cancelhandling);
34 while (1)
35 {
36 int newval = (state == PTHREAD_CANCEL_DISABLE
37 ? oldval | CANCELSTATE_BITMASK
38 : oldval & ~CANCELSTATE_BITMASK);
39
40 if (oldstate != NULL)
41 *oldstate = ((oldval & CANCELSTATE_BITMASK)
42 ? PTHREAD_CANCEL_DISABLE : PTHREAD_CANCEL_ENABLE);
43
44 if (oldval == newval)
45 break;
46
47 if (atomic_compare_exchange_weak_acquire (&self->cancelhandling,
48 &oldval, newval))
49 {
50 if (cancel_enabled_and_canceled_and_async (newval))
51 __do_cancel ();
52
53 break;
54 }
55 }
56
57 return 0;
58}
59libc_hidden_def (__pthread_setcancelstate)
60weak_alias (__pthread_setcancelstate, pthread_setcancelstate)
61