version 1.1, 2006/10/20 19:40:17 |
version 1.1.2.4, 2007/02/03 16:32:50 |
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/* $NetBSD$ */ |
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/*- |
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* Copyright (c) 2006, 2007 The NetBSD Foundation, Inc. |
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* All rights reserved. |
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* |
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* This code is derived from software contributed to The NetBSD Foundation |
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* by Andrew Doran. |
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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 the NetBSD |
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* Foundation, Inc. and its contributors. |
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* 4. Neither the name of The NetBSD Foundation nor the names of its |
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* contributors may be used to endorse or promote products derived |
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* from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#ifndef _SYS_CONDVAR_H_ |
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#define _SYS_CONDVAR_H_ |
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#include <sys/mutex.h> |
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/* |
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* The condition variable implementation is private to kern_condvar.c but |
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* the size of a kcondvar_t must remain constant. cv_waiters is protected |
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* both by the interlock passed to cv_wait() (increment only), and the sleep |
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* queue lock acquired with sleeptab_lookup() (increment and decrement). |
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* cv_wmesg is static and does not change throughout the life of the CV. |
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*/ |
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typedef struct kcondvar { |
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const char *cv_wmesg; /* description for /bin/ps */ |
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u_int cv_waiters; /* number of waiters */ |
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} kcondvar_t; |
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#ifdef _KERNEL |
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void cv_init(kcondvar_t *, const char *); |
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void cv_destroy(kcondvar_t *); |
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void cv_wait(kcondvar_t *, kmutex_t *); |
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int cv_wait_sig(kcondvar_t *, kmutex_t *); |
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int cv_timedwait(kcondvar_t *, kmutex_t *, int); |
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int cv_timedwait_sig(kcondvar_t *, kmutex_t *, int); |
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void cv_signal(kcondvar_t *); |
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void cv_broadcast(kcondvar_t *); |
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void cv_signal_async(kcondvar_t *); |
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void cv_broadcast_async(kcondvar_t *); |
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int cv_has_waiters(kcondvar_t *); |
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#endif /* _KERNEL */ |
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#endif /* _SYS_CONDVAR_H_ */ |