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 <errno.h>
20#include "pthreadP.h"
21#include <atomic.h>
22#include <shlib-compat.h>
23
24int
25___pthread_key_delete (pthread_key_t key)
26{
27 int result = EINVAL;
28
29 if (__glibc_likely (key < PTHREAD_KEYS_MAX))
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}
42versioned_symbol (libc, ___pthread_key_delete, pthread_key_delete,
43 GLIBC_2_34);
44libc_hidden_ver (___pthread_key_delete, __pthread_key_delete)
45#ifndef SHARED
46strong_alias (___pthread_key_delete, __pthread_key_delete)
47#endif
48
49#if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_34)
50compat_symbol (libpthread, ___pthread_key_delete, pthread_key_delete,
51 GLIBC_2_0);
52#endif
53