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1/* Lock a semaphore if it does not require blocking. Generic version.
2 Copyright (C) 2005-2019 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 <http://www.gnu.org/licenses/>. */
18
19#include <semaphore.h>
20#include <errno.h>
21
22#include <pt-internal.h>
23
24int
25__sem_trywait (sem_t *sem)
26{
27 __pthread_spin_lock (&sem->__lock);
28 if (sem->__value > 0)
29 /* Successful down. */
30 {
31 sem->__value--;
32 __pthread_spin_unlock (&sem->__lock);
33 return 0;
34 }
35 __pthread_spin_unlock (&sem->__lock);
36
37 errno = EAGAIN;
38 return -1;
39}
40
41strong_alias (__sem_trywait, sem_trywait);
42

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