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1 | /* Copyright (C) 2002-2024 Free Software Foundation, Inc. | |
2 | This file is part of the GNU C Library. | |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
15 | License along with the GNU C Library; if not, see | |
16 | <https://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include <errno.h> | |
19 | #include <semaphore.h> | |
20 | #include <shlib-compat.h> | |
21 | #include "semaphoreP.h" | |
22 | #include <kernel-features.h> | |
23 | #include <futex-internal.h> | |
24 | ||
25 | ||
26 | int | |
27 | __new_sem_init (sem_t *sem, int pshared, unsigned int value) | |
28 | { | |
29 | ASSERT_PTHREAD_INTERNAL_SIZE (sem_t, struct new_sem); | |
30 | ||
31 | /* Parameter sanity check. */ | |
32 | if (__glibc_unlikely (value > SEM_VALUE_MAX)) | |
33 | { | |
34 | __set_errno (EINVAL); | |
35 | return -1; | |
36 | } | |
37 | pshared = pshared != 0 ? PTHREAD_PROCESS_SHARED : PTHREAD_PROCESS_PRIVATE; | |
38 | int err = futex_supports_pshared (pshared); | |
39 | if (err != 0) | |
40 | { | |
41 | __set_errno (err); | |
42 | return -1; | |
43 | } | |
44 | ||
45 | /* Map to the internal type. */ | |
46 | struct new_sem *isem = (struct new_sem *) sem; | |
47 | ||
48 | /* Use the values the caller provided. */ | |
49 | #if __HAVE_64B_ATOMICS | |
50 | isem->data = value; | |
51 | #else | |
52 | isem->value = value << SEM_VALUE_SHIFT; | |
53 | /* pad is used as a mutex on pre-v9 sparc and ignored otherwise. */ | |
54 | isem->pad = 0; | |
55 | isem->nwaiters = 0; | |
56 | #endif | |
57 | ||
58 | isem->private = (pshared == PTHREAD_PROCESS_PRIVATE | |
59 | ? FUTEX_PRIVATE : FUTEX_SHARED); | |
60 | ||
61 | return 0; | |
62 | } | |
63 | versioned_symbol (libc, __new_sem_init, sem_init, GLIBC_2_34); | |
64 | ||
65 | #if OTHER_SHLIB_COMPAT(libpthread, GLIBC_2_1, GLIBC_2_34) | |
66 | compat_symbol (libpthread, __new_sem_init, sem_init, GLIBC_2_1); | |
67 | #endif | |
68 | ||
69 | #if OTHER_SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1) | |
70 | int | |
71 | attribute_compat_text_section | |
72 | __old_sem_init (sem_t *sem, int pshared, unsigned int value) | |
73 | { | |
74 | ASSERT_PTHREAD_INTERNAL_SIZE (sem_t, struct new_sem); | |
75 | ||
76 | /* Parameter sanity check. */ | |
77 | if (__glibc_unlikely (value > SEM_VALUE_MAX)) | |
78 | { | |
79 | __set_errno (EINVAL); | |
80 | return -1; | |
81 | } | |
82 | ||
83 | /* Map to the internal type. */ | |
84 | struct old_sem *isem = (struct old_sem *) sem; | |
85 | ||
86 | /* Use the value the user provided. */ | |
87 | isem->value = value; | |
88 | ||
89 | /* We cannot store the PSHARED attribute. So we always use the | |
90 | operations needed for shared semaphores. */ | |
91 | ||
92 | return 0; | |
93 | } | |
94 | compat_symbol (libpthread, __old_sem_init, sem_init, GLIBC_2_0); | |
95 | #endif |