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2b778ceb | 1 | /* Copyright (C) 2002-2021 Free Software Foundation, Inc. |
76a50749 UD |
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 | |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
76a50749 UD |
18 | |
19 | #include <errno.h> | |
20 | #include <semaphore.h> | |
76a50749 UD |
21 | #include <shlib-compat.h> |
22 | #include "semaphoreP.h" | |
3d2dd6ca | 23 | #include <kernel-features.h> |
a2f0363f | 24 | #include <futex-internal.h> |
042e1521 | 25 | |
76a50749 UD |
26 | |
27 | int | |
042e1521 | 28 | __new_sem_init (sem_t *sem, int pshared, unsigned int value) |
76a50749 | 29 | { |
72b3c6ee AZ |
30 | ASSERT_PTHREAD_INTERNAL_SIZE (sem_t, struct new_sem); |
31 | ||
76a50749 | 32 | /* Parameter sanity check. */ |
a1ffb40e | 33 | if (__glibc_unlikely (value > SEM_VALUE_MAX)) |
76a50749 UD |
34 | { |
35 | __set_errno (EINVAL); | |
36 | return -1; | |
37 | } | |
a2f0363f TR |
38 | pshared = pshared != 0 ? PTHREAD_PROCESS_SHARED : PTHREAD_PROCESS_PRIVATE; |
39 | int err = futex_supports_pshared (pshared); | |
40 | if (err != 0) | |
41 | { | |
42 | __set_errno (err); | |
43 | return -1; | |
44 | } | |
76a50749 UD |
45 | |
46 | /* Map to the internal type. */ | |
3d2dd6ca | 47 | struct new_sem *isem = (struct new_sem *) sem; |
76a50749 | 48 | |
042e1521 CD |
49 | /* Use the values the caller provided. */ |
50 | #if __HAVE_64B_ATOMICS | |
51 | isem->data = value; | |
3d2dd6ca | 52 | #else |
042e1521 | 53 | isem->value = value << SEM_VALUE_SHIFT; |
09cb2785 AZ |
54 | /* pad is used as a mutex on pre-v9 sparc and ignored otherwise. */ |
55 | isem->pad = 0; | |
042e1521 | 56 | isem->nwaiters = 0; |
3d2dd6ca | 57 | #endif |
76a50749 | 58 | |
a2f0363f TR |
59 | isem->private = (pshared == PTHREAD_PROCESS_PRIVATE |
60 | ? FUTEX_PRIVATE : FUTEX_SHARED); | |
76a50749 UD |
61 | |
62 | return 0; | |
63 | } | |
64 | versioned_symbol (libpthread, __new_sem_init, sem_init, GLIBC_2_1); | |
3d2dd6ca UD |
65 | |
66 | ||
67 | ||
ad3bf20c | 68 | #if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1) |
3d2dd6ca UD |
69 | int |
70 | attribute_compat_text_section | |
9d46370c | 71 | __old_sem_init (sem_t *sem, int pshared, unsigned int value) |
3d2dd6ca | 72 | { |
72b3c6ee AZ |
73 | ASSERT_PTHREAD_INTERNAL_SIZE (sem_t, struct new_sem); |
74 | ||
3d2dd6ca | 75 | /* Parameter sanity check. */ |
a1ffb40e | 76 | if (__glibc_unlikely (value > SEM_VALUE_MAX)) |
3d2dd6ca UD |
77 | { |
78 | __set_errno (EINVAL); | |
79 | return -1; | |
80 | } | |
81 | ||
82 | /* Map to the internal type. */ | |
83 | struct old_sem *isem = (struct old_sem *) sem; | |
84 | ||
85 | /* Use the value the user provided. */ | |
86 | isem->value = value; | |
87 | ||
88 | /* We cannot store the PSHARED attribute. So we always use the | |
89 | operations needed for shared semaphores. */ | |
90 | ||
91 | return 0; | |
92 | } | |
ad3bf20c UD |
93 | compat_symbol (libpthread, __old_sem_init, sem_init, GLIBC_2_0); |
94 | #endif |