| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 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 |