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70 lines
2.4 KiB
C
70 lines
2.4 KiB
C
/*-
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* Copyright (c) 2000 Jake Burkholder <jake@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 _SYS_CONDVAR_H_
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#define _SYS_CONDVAR_H_
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#ifndef LOCORE
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#include <sys/queue.h>
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struct mtx;
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struct thread;
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TAILQ_HEAD(cv_waitq, thread);
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/*
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* Condition variable. The waiters count is protected by the mutex that
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* protects the condition; that is, the mutex that is passed to cv_wait*()
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* and is held across calls to cv_signal() and cv_broadcast(). It is an
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* optimization to avoid looking up the sleep queue if there are no waiters.
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*/
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struct cv {
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const char *cv_description;
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int cv_waiters;
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};
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#ifdef _KERNEL
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void cv_init(struct cv *cvp, const char *desc);
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void cv_destroy(struct cv *cvp);
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void cv_wait(struct cv *cvp, struct mtx *mp);
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int cv_wait_sig(struct cv *cvp, struct mtx *mp);
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int cv_timedwait(struct cv *cvp, struct mtx *mp, int timo);
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int cv_timedwait_sig(struct cv *cvp, struct mtx *mp, int timo);
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void cv_signal(struct cv *cvp);
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void cv_broadcastpri(struct cv *cvp, int pri);
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#define cv_broadcast(cvp) cv_broadcastpri(cvp, -1)
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#define cv_wmesg(cvp) ((cvp)->cv_description)
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#endif /* _KERNEL */
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#endif /* !LOCORE */
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#endif /* _SYS_CONDVAR_H_ */
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