| 1 | /* Copyright (C) 2002-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | Ulrich Drepper <drepper@redhat.com>, 2002. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <semaphore.h> |
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| 20 | #include <futex-internal.h> |
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| 21 | #include "pthreadP.h" |
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| 22 | |
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| 23 | #define SEM_SHM_PREFIX "sem." |
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| 24 | |
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| 25 | static inline void __new_sem_open_init (struct new_sem *sem, unsigned value) |
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| 26 | { |
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| 27 | #if __HAVE_64B_ATOMICS |
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| 28 | sem->data = value; |
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| 29 | #else |
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| 30 | sem->value = value << SEM_VALUE_SHIFT; |
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| 31 | sem->nwaiters = 0; |
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| 32 | #endif |
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| 33 | /* pad is used as a mutex on pre-v9 sparc and ignored otherwise. */ |
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| 34 | sem->pad = 0; |
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| 35 | |
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| 36 | /* This always is a shared semaphore. */ |
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| 37 | sem->private = FUTEX_SHARED; |
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| 38 | } |
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| 39 | |
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| 40 | /* Prototypes of functions with multiple interfaces. */ |
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| 41 | extern int __new_sem_init (sem_t *sem, int pshared, unsigned int value); |
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| 42 | extern int __old_sem_init (sem_t *sem, int pshared, unsigned int value); |
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| 43 | extern int __new_sem_destroy (sem_t *sem); |
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| 44 | extern int __new_sem_post (sem_t *sem); |
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| 45 | extern int __new_sem_wait (sem_t *sem); |
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| 46 | extern int __old_sem_wait (sem_t *sem); |
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| 47 | extern int __new_sem_trywait (sem_t *sem); |
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| 48 | extern int __new_sem_getvalue (sem_t *sem, int *sval); |
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| 49 | |
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| 50 | #if __TIMESIZE == 64 |
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| 51 | # define __sem_clockwait64 __sem_clockwait |
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| 52 | # define __sem_timedwait64 __sem_timedwait |
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| 53 | #else |
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| 54 | extern int |
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| 55 | __sem_clockwait64 (sem_t *sem, clockid_t clockid, |
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| 56 | const struct __timespec64 *abstime); |
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| 57 | libc_hidden_proto (__sem_clockwait64) |
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| 58 | extern int |
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| 59 | __sem_timedwait64 (sem_t *sem, const struct __timespec64 *abstime); |
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| 60 | libc_hidden_proto (__sem_timedwait64) |
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| 61 | #endif |
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| 62 | |
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