1 /* Lock a semaphore if it does not require blocking. Generic version.
2 Copyright (C) 2005-2021 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 <semaphore.h>
20 #include <errno.h>
21
22 #include <pt-internal.h>
23
24 int
__sem_trywait(sem_t * sem)25 __sem_trywait (sem_t *sem)
26 {
27 struct new_sem *isem = (struct new_sem *) sem;
28
29 if (__sem_waitfast (isem, 1) == 0)
30 return 0;
31
32 errno = EAGAIN;
33 return -1;
34 }
35
36 weak_alias (__sem_trywait, sem_trywait);
37