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f3c13160 | 1 | /* pthread_spin_unlock -- unlock a spin lock. Generic version. |
d614a753 | 2 | Copyright (C) 2003-2020 Free Software Foundation, Inc. |
f3c13160 RM |
3 | This file is part of the GNU C Library. |
4 | Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 17 | License along with the GNU C Library; if not, see |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
f3c13160 RM |
19 | |
20 | #include "pthreadP.h" | |
21 | #include <atomic.h> | |
22 | ||
23 | int | |
24 | pthread_spin_unlock (pthread_spinlock_t *lock) | |
25 | { | |
12d2dd70 SL |
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); | |
f3c13160 RM |
30 | return 0; |
31 | } |