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b168057a | 1 | /* Copyright (C) 2002-2015 Free Software Foundation, Inc. |
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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 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
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18 | |
19 | #include <errno.h> | |
20 | #include <semaphore.h> | |
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21 | #include <shlib-compat.h> |
22 | #include "semaphoreP.h" | |
3d2dd6ca | 23 | #include <kernel-features.h> |
76a50749 | 24 | |
042e1521 CD |
25 | /* Returns FUTEX_PRIVATE if pshared is zero and private futexes are supported; |
26 | returns FUTEX_SHARED otherwise. | |
27 | TODO Remove when cleaning up the futex API throughout glibc. */ | |
28 | static __always_inline int | |
29 | futex_private_if_supported (int pshared) | |
30 | { | |
31 | if (pshared != 0) | |
32 | return LLL_SHARED; | |
33 | #ifdef __ASSUME_PRIVATE_FUTEX | |
34 | return LLL_PRIVATE; | |
35 | #else | |
36 | return THREAD_GETMEM (THREAD_SELF, header.private_futex) | |
37 | ^ FUTEX_PRIVATE_FLAG; | |
38 | #endif | |
39 | } | |
40 | ||
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41 | |
42 | int | |
042e1521 | 43 | __new_sem_init (sem_t *sem, int pshared, unsigned int value) |
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44 | { |
45 | /* Parameter sanity check. */ | |
a1ffb40e | 46 | if (__glibc_unlikely (value > SEM_VALUE_MAX)) |
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47 | { |
48 | __set_errno (EINVAL); | |
49 | return -1; | |
50 | } | |
51 | ||
52 | /* Map to the internal type. */ | |
3d2dd6ca | 53 | struct new_sem *isem = (struct new_sem *) sem; |
76a50749 | 54 | |
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55 | /* Use the values the caller provided. */ |
56 | #if __HAVE_64B_ATOMICS | |
57 | isem->data = value; | |
3d2dd6ca | 58 | #else |
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59 | isem->value = value << SEM_VALUE_SHIFT; |
60 | isem->nwaiters = 0; | |
3d2dd6ca | 61 | #endif |
76a50749 | 62 | |
042e1521 | 63 | isem->private = futex_private_if_supported (pshared); |
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64 | |
65 | return 0; | |
66 | } | |
67 | versioned_symbol (libpthread, __new_sem_init, sem_init, GLIBC_2_1); | |
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68 | |
69 | ||
70 | ||
ad3bf20c | 71 | #if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1) |
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72 | int |
73 | attribute_compat_text_section | |
74 | __old_sem_init (sem, pshared, value) | |
75 | sem_t *sem; | |
76 | int pshared; | |
77 | unsigned int value; | |
78 | { | |
79 | /* Parameter sanity check. */ | |
a1ffb40e | 80 | if (__glibc_unlikely (value > SEM_VALUE_MAX)) |
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81 | { |
82 | __set_errno (EINVAL); | |
83 | return -1; | |
84 | } | |
85 | ||
86 | /* Map to the internal type. */ | |
87 | struct old_sem *isem = (struct old_sem *) sem; | |
88 | ||
89 | /* Use the value the user provided. */ | |
90 | isem->value = value; | |
91 | ||
92 | /* We cannot store the PSHARED attribute. So we always use the | |
93 | operations needed for shared semaphores. */ | |
94 | ||
95 | return 0; | |
96 | } | |
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97 | compat_symbol (libpthread, __old_sem_init, sem_init, GLIBC_2_0); |
98 | #endif |