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83 lines
2.6 KiB
C
83 lines
2.6 KiB
C
/* Copyright (C) 2002-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Ulrich Drepper <drepper@redhat.com>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <semaphore.h>
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#include <futex-internal.h>
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#include "pthreadP.h"
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#define SEM_SHM_PREFIX "sem."
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/* Keeping track of currently used mappings. */
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struct inuse_sem
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{
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dev_t dev;
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ino_t ino;
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int refcnt;
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sem_t *sem;
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char name[];
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};
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/* The search tree for existing mappings. */
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extern void *__sem_mappings attribute_hidden;
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/* Lock to protect the search tree. */
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extern int __sem_mappings_lock attribute_hidden;
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/* Comparison function for search in tree with existing mappings. */
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extern int __sem_search (const void *a, const void *b) attribute_hidden;
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static inline void __new_sem_open_init (struct new_sem *sem, unsigned value)
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{
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#if __HAVE_64B_ATOMICS
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sem->data = value;
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#else
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sem->value = value << SEM_VALUE_SHIFT;
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sem->nwaiters = 0;
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#endif
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/* pad is used as a mutex on pre-v9 sparc and ignored otherwise. */
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sem->pad = 0;
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/* This always is a shared semaphore. */
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sem->private = FUTEX_SHARED;
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}
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/* Prototypes of functions with multiple interfaces. */
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extern int __new_sem_init (sem_t *sem, int pshared, unsigned int value);
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extern int __old_sem_init (sem_t *sem, int pshared, unsigned int value);
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extern int __new_sem_destroy (sem_t *sem);
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extern int __new_sem_post (sem_t *sem);
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extern int __new_sem_wait (sem_t *sem);
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extern int __old_sem_wait (sem_t *sem);
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extern int __new_sem_trywait (sem_t *sem);
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extern int __new_sem_getvalue (sem_t *sem, int *sval);
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#if __TIMESIZE == 64
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# define __sem_clockwait64 __sem_clockwait
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# define __sem_timedwait64 __sem_timedwait
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#else
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extern int
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__sem_clockwait64 (sem_t *sem, clockid_t clockid,
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const struct __timespec64 *abstime);
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libpthread_hidden_proto (__sem_clockwait64)
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extern int
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__sem_timedwait64 (sem_t *sem, const struct __timespec64 *abstime);
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libpthread_hidden_proto (__sem_timedwait64)
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#endif
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