1 | /* Copyright (C) 2002-2016 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 | |
27 | int |
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 | isem->nwaiters = 0; |
53 | #endif |
54 | |
55 | isem->private = (pshared == PTHREAD_PROCESS_PRIVATE |
56 | ? FUTEX_PRIVATE : FUTEX_SHARED); |
57 | |
58 | return 0; |
59 | } |
60 | versioned_symbol (libpthread, __new_sem_init, sem_init, GLIBC_2_1); |
61 | |
62 | |
63 | |
64 | #if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1) |
65 | int |
66 | attribute_compat_text_section |
67 | __old_sem_init (sem_t *sem, int pshared, unsigned int value) |
68 | { |
69 | /* Parameter sanity check. */ |
70 | if (__glibc_unlikely (value > SEM_VALUE_MAX)) |
71 | { |
72 | __set_errno (EINVAL); |
73 | return -1; |
74 | } |
75 | |
76 | /* Map to the internal type. */ |
77 | struct old_sem *isem = (struct old_sem *) sem; |
78 | |
79 | /* Use the value the user provided. */ |
80 | isem->value = value; |
81 | |
82 | /* We cannot store the PSHARED attribute. So we always use the |
83 | operations needed for shared semaphores. */ |
84 | |
85 | return 0; |
86 | } |
87 | compat_symbol (libpthread, __old_sem_init, sem_init, GLIBC_2_0); |
88 | #endif |
89 | |