/* $NetBSD: condvar.h,v 1.12 2009/12/05 22:38:19 pooka Exp $ */

/*-

* Copyright (c) 2006, 2007, 2008 The NetBSD Foundation, Inc.

* All rights reserved.

*

* This code is derived from software contributed to The NetBSD Foundation

* by Andrew Doran.

*

* Redistribution and use in source and binary forms, with or without

* modification, are permitted provided that the following conditions

* are met:

* 1. Redistributions of source code must retain the above copyright

* notice, this list of conditions and the following disclaimer.

* 2. Redistributions in binary form must reproduce the above copyright

* notice, this list of conditions and the following disclaimer in the

* documentation and/or other materials provided with the distribution.

*

* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS

* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED

* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS

* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

* POSSIBILITY OF SUCH DAMAGE.

*/

#ifndef _SYS_CONDVAR_H_

#define _SYS_CONDVAR_H_

#include <sys/mutex.h>

typedef struct kcondvar {

void *cv_opaque[3];

} kcondvar_t;

#ifdef _KERNEL

void cv_init(kcondvar_t *, const char *);

void cv_destroy(kcondvar_t *);

void cv_wait(kcondvar_t *, kmutex_t *);

int cv_wait_sig(kcondvar_t *, kmutex_t *);

int cv_timedwait(kcondvar_t *, kmutex_t *, int);

int cv_timedwait_sig(kcondvar_t *, kmutex_t *, int);

void cv_signal(kcondvar_t *);

void cv_broadcast(kcondvar_t *);

bool cv_has_waiters(kcondvar_t *);

bool cv_is_valid(kcondvar_t *);

/* The "lightning bolt", awoken once per second by the clock interrupt. */

extern kcondvar_t lbolt;

#endif /* _KERNEL */

#endif /* _SYS_CONDVAR_H_ */