0686d5e26f
Reserve 12 more bytes in sem_t to give room for future implementation improvements. This gets us to a 16 bytes sem_t. Glibc uses 32 bytes (16 actual use + 16 reserved), while OpenBSD has 16 bytes (out of which 4 are for padding). Bug: 14587103 Bug: 12875898 Change-Id: Id835cc5abf874c651e6b5ad5b8f29c9d6ab08d5a
62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _SEMAPHORE_H
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#define _SEMAPHORE_H
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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typedef struct {
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volatile unsigned int count;
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#ifdef __LP64__
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int __reserved[3];
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#endif
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} sem_t;
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#define SEM_FAILED NULL
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extern int sem_init(sem_t *sem, int pshared, unsigned int value);
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extern int sem_close(sem_t *);
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extern int sem_destroy(sem_t *);
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extern int sem_getvalue(sem_t *, int *);
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extern int sem_init(sem_t *, int, unsigned int);
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extern sem_t *sem_open(const char *, int, ...);
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extern int sem_post(sem_t *);
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extern int sem_trywait(sem_t *);
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extern int sem_unlink(const char *);
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extern int sem_wait(sem_t *);
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struct timespec;
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extern int sem_timedwait(sem_t *sem, const struct timespec *abs_timeout);
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__END_DECLS
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#endif /* _SEMAPHORE_H */
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