73 lines
2.5 KiB
C
73 lines
2.5 KiB
C
/*
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* Copyright (c) 2002 Alfred Perlstein <alfred@FreeBSD.org>
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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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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 THE AUTHOR 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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#ifndef __SEMAPHORE_H_
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#define __SEMAPHORE_H_
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typedef intptr_t semid_t;
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#ifndef _KERNEL
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#include <sys/cdefs.h>
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/*
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* Semaphore definitions.
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*/
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struct sem {
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#define SEM_MAGIC ((u_int32_t) 0x09fa4012)
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u_int32_t magic;
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pthread_mutex_t lock;
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pthread_cond_t gtzero;
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u_int32_t count;
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u_int32_t nwaiters;
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#define SEM_USER (NULL)
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semid_t semid; /* semaphore id if kernel (shared) semaphore */
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int syssem; /* 1 if kernel (shared) semaphore */
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LIST_ENTRY(sem) entry;
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struct sem **backpointer;
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};
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__BEGIN_DECLS
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int ksem_close(semid_t id);
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int ksem_post(semid_t id);
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int ksem_wait(semid_t id);
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int ksem_trywait(semid_t id);
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int ksem_timedwait(semid_t id, struct timespec *abstime);
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int ksem_init(semid_t *idp, unsigned int value);
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int ksem_open(semid_t *idp, const char *name, int oflag, mode_t mode,
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unsigned int value);
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int ksem_unlink(const char *name);
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int ksem_getvalue(semid_t id, int *val);
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int ksem_destroy(semid_t id);
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__END_DECLS
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#endif /* !_KERNEL */
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#endif /* __SEMAPHORE_H_ */
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