1 /* Get the value of a semaphore. Generic version.
2 Copyright (C) 2005-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
19 #include <semaphore.h>
20 #include <pt-internal.h>
23 __sem_getvalue (sem_t
*restrict sem
, int *restrict value
)
25 struct new_sem
*isem
= (struct new_sem
*) sem
;
27 #if __HAVE_64B_ATOMICS
28 *value
= atomic_load_relaxed (&isem
->data
) & SEM_VALUE_MASK
;
30 *value
= atomic_load_relaxed (&isem
->value
) >> SEM_VALUE_SHIFT
;
36 strong_alias (__sem_getvalue
, sem_getvalue
);