1 /* pthread_spin_trylock -- trylock a spin lock. Generic version.
2 Copyright (C) 2012-2016 Free Software Foundation, Inc.
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 <http://www.gnu.org/licenses/>. */
17
18 #include <errno.h>
19 #include <atomic.h>
20 #include "pthreadP.h"
21
22 int
pthread_spin_trylock(pthread_spinlock_t * lock)23 pthread_spin_trylock (pthread_spinlock_t *lock)
24 {
25 return atomic_exchange_acq (lock, 1) ? EBUSY : 0;
26 }
27