1 /* pthread_spin_unlock -- unlock a spin lock. Generic version.
2 Copyright (C) 2003-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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 "pthreadP.h"
20 #include <atomic.h>
21 #include <shlib-compat.h>
22
23 int
__pthread_spin_unlock(pthread_spinlock_t * lock)24 __pthread_spin_unlock (pthread_spinlock_t *lock)
25 {
26 /* The atomic_store_release synchronizes-with the atomic_exchange_acquire
27 or atomic_compare_exchange_weak_acquire in pthread_spin_lock /
28 pthread_spin_trylock. */
29 atomic_store_release (lock, 0);
30 return 0;
31 }
32 versioned_symbol (libc, __pthread_spin_unlock, pthread_spin_unlock,
33 GLIBC_2_34);
34
35 #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_2, GLIBC_2_34)
36 compat_symbol (libpthread, __pthread_spin_unlock, pthread_spin_unlock,
37 GLIBC_2_2);
38 #endif
39