1 /* Copyright (C) 2002, 2007 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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 <errno.h>
20 #include <semaphore.h>
21 #include <lowlevellock.h>
22 #include "semaphoreP.h"
23 #include <bits/kernel-features.h>
24
25
26 int
sem_init(sem_t * sem,int pshared,unsigned int value)27 sem_init (
28 sem_t *sem,
29 int pshared,
30 unsigned int value)
31 {
32 /* Parameter sanity check. */
33 if (__builtin_expect (value > SEM_VALUE_MAX, 0))
34 {
35 __set_errno (EINVAL);
36 return -1;
37 }
38
39 /* Map to the internal type. */
40 struct new_sem *isem = (struct new_sem *) sem;
41
42 /* Use the values the user provided. */
43 isem->value = value;
44 #ifdef __ASSUME_PRIVATE_FUTEX
45 isem->private = pshared ? 0 : FUTEX_PRIVATE_FLAG;
46 #else
47 isem->private = pshared ? 0 : THREAD_GETMEM (THREAD_SELF,
48 header.private_futex);
49 #endif
50
51 isem->nwaiters = 0;
52
53 return 0;
54 }
55