1/* Copyright (C) 2002-2017 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 <shlib-compat.h>
22#include "semaphoreP.h"
23#include <kernel-features.h>
24#include <futex-internal.h>
25
26
27int
28__new_sem_init (sem_t *sem, int pshared, unsigned int value)
29{
30 /* Parameter sanity check. */
31 if (__glibc_unlikely (value > SEM_VALUE_MAX))
32 {
33 __set_errno (EINVAL);
34 return -1;
35 }
36 pshared = pshared != 0 ? PTHREAD_PROCESS_SHARED : PTHREAD_PROCESS_PRIVATE;
37 int err = futex_supports_pshared (pshared);
38 if (err != 0)
39 {
40 __set_errno (err);
41 return -1;
42 }
43
44 /* Map to the internal type. */
45 struct new_sem *isem = (struct new_sem *) sem;
46
47 /* Use the values the caller provided. */
48#if __HAVE_64B_ATOMICS
49 isem->data = value;
50#else
51 isem->value = value << SEM_VALUE_SHIFT;
52 /* pad is used as a mutex on pre-v9 sparc and ignored otherwise. */
53 isem->pad = 0;
54 isem->nwaiters = 0;
55#endif
56
57 isem->private = (pshared == PTHREAD_PROCESS_PRIVATE
58 ? FUTEX_PRIVATE : FUTEX_SHARED);
59
60 return 0;
61}
62versioned_symbol (libpthread, __new_sem_init, sem_init, GLIBC_2_1);
63
64
65
66#if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1)
67int
68attribute_compat_text_section
69__old_sem_init (sem_t *sem, int pshared, unsigned int value)
70{
71 /* Parameter sanity check. */
72 if (__glibc_unlikely (value > SEM_VALUE_MAX))
73 {
74 __set_errno (EINVAL);
75 return -1;
76 }
77
78 /* Map to the internal type. */
79 struct old_sem *isem = (struct old_sem *) sem;
80
81 /* Use the value the user provided. */
82 isem->value = value;
83
84 /* We cannot store the PSHARED attribute. So we always use the
85 operations needed for shared semaphores. */
86
87 return 0;
88}
89compat_symbol (libpthread, __old_sem_init, sem_init, GLIBC_2_0);
90#endif
91