f4c1db8901
to INT_MAX. Otherwise, a process could create a semaphore (or increase its value via ksem_post()) beyond INT_MAX and sem_getvalue() would return a negative value. sem_getvalue() is only supposed to return a negative value if that is the number of waiters for that semaphore. MFC after: 2 weeks
70 lines
2.5 KiB
C
70 lines
2.5 KiB
C
/*-
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* Copyright (c) 1996, 1997
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* HD Associates, Inc. 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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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by HD Associates, Inc
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT 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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* $FreeBSD$
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*/
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/* semaphore.h: POSIX 1003.1b semaphores */
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#ifndef _SEMAPHORE_H_
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#define _SEMAPHORE_H_
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#include <machine/_limits.h>
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/* Opaque type definition. */
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struct sem;
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typedef struct sem * sem_t;
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#define SEM_FAILED ((sem_t *)0)
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#define SEM_VALUE_MAX __INT_MAX
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#ifndef _KERNEL
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#include <sys/cdefs.h>
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struct timespec;
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__BEGIN_DECLS
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int sem_close(sem_t *);
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int sem_destroy(sem_t *);
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int sem_getvalue(sem_t * __restrict, int * __restrict);
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int sem_init(sem_t *, int, unsigned int);
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sem_t *sem_open(const char *, int, ...);
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int sem_post(sem_t *);
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int sem_timedwait(sem_t * __restrict, const struct timespec * __restrict);
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int sem_trywait(sem_t *);
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int sem_unlink(const char *);
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int sem_wait(sem_t *);
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__END_DECLS
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#endif
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#endif /* !_SEMAPHORE_H_ */
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