1 | /* Get the value of a semaphore. Generic version. |
2 | Copyright (C) 2005-2022 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 <pt-internal.h> |
21 | |
22 | int |
23 | __sem_getvalue (sem_t *restrict sem, int *restrict value) |
24 | { |
25 | struct new_sem *isem = (struct new_sem *) sem; |
26 | |
27 | #if __HAVE_64B_ATOMICS |
28 | *value = atomic_load_relaxed (&isem->data) & SEM_VALUE_MASK; |
29 | #else |
30 | *value = atomic_load_relaxed (&isem->value) >> SEM_VALUE_SHIFT; |
31 | #endif |
32 | |
33 | return 0; |
34 | } |
35 | |
36 | strong_alias (__sem_getvalue, sem_getvalue); |
37 | |