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63 lines
2.6 KiB
C
63 lines
2.6 KiB
C
/*
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* Copyright (C) 2001 Jason Evans <jasone@freebsd.org>. 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(s), this list of conditions and the following disclaimer as
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* the first lines of this file unmodified other than the possible
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* addition of one or more copyright notices.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice(s), 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 COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* 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 SUCH
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* DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_SEMA_H_
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#define _SYS_SEMA_H_
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#include <sys/queue.h>
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#include <sys/_lock.h>
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#include <sys/_mutex.h>
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#include <sys/condvar.h>
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struct sema {
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struct mtx sema_mtx; /* General protection lock. */
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struct cv sema_cv; /* Waiters. */
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int sema_waiters; /* Number of waiters. */
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int sema_value; /* Semaphore value. */
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};
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#ifdef _KERNEL
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void sema_init(struct sema *sema, int value, const char *description);
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void sema_destroy(struct sema *sema);
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void _sema_post(struct sema *sema, const char *file, int line);
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void _sema_wait(struct sema *sema, const char *file, int line);
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int _sema_timedwait(struct sema *sema, int timo, const char *file, int
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line);
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int _sema_trywait(struct sema *sema, const char *file, int line);
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int sema_value(struct sema *sema);
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#define sema_post(sema) _sema_post((sema), LOCK_FILE, LOCK_LINE)
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#define sema_wait(sema) _sema_wait((sema), LOCK_FILE, LOCK_LINE)
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#define sema_timedwait(sema, timo) \
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_sema_timedwait((sema), (timo), LOCK_FILE, LOCK_LINE)
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#define sema_trywait(sema) _sema_trywait((sema), LOCK_FILE, LOCK_LINE)
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#endif /* _KERNEL */
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#endif /* _SYS_SEMA_H_ */
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