1 /* Copyright (C) 2002, 2003 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 <http://www.gnu.org/licenses/>. */
18
19 #include <errno.h>
20 #include "pthreadP.h"
21 #include <atomic.h>
22
23
24 int
pthread_key_delete(pthread_key_t key)25 pthread_key_delete (pthread_key_t key)
26 {
27 int result = EINVAL;
28
29 if (__builtin_expect (key < PTHREAD_KEYS_MAX, 1))
30 {
31 unsigned int seq = __pthread_keys[key].seq;
32
33 if (__builtin_expect (! KEY_UNUSED (seq), 1)
34 && ! atomic_compare_and_exchange_bool_acq (&__pthread_keys[key].seq,
35 seq + 1, seq))
36 /* We deleted a valid key. */
37 result = 0;
38 }
39
40 return result;
41 }
42