The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/condvar.h

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    1 /*      $NetBSD: condvar.h,v 1.17 2020/05/11 03:59:33 riastradh Exp $   */
    2 
    3 /*-
    4  * Copyright (c) 2006, 2007, 2008, 2020 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Andrew Doran.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   29  * POSSIBILITY OF SUCH DAMAGE.
   30  */
   31 
   32 #ifndef _SYS_CONDVAR_H_
   33 #define _SYS_CONDVAR_H_
   34 
   35 typedef struct kcondvar {
   36         void            *cv_opaque[2];
   37 } kcondvar_t;
   38 
   39 #ifdef _KERNEL
   40 
   41 struct bintime;
   42 struct kmutex;
   43 struct timespec;
   44 
   45 void    cv_init(kcondvar_t *, const char *);
   46 void    cv_destroy(kcondvar_t *);
   47 
   48 void    cv_wait(kcondvar_t *, struct kmutex *);
   49 int     cv_wait_sig(kcondvar_t *, struct kmutex *);
   50 int     cv_timedwait(kcondvar_t *, struct kmutex *, int);
   51 int     cv_timedwait_sig(kcondvar_t *, struct kmutex *, int);
   52 int     cv_timedwaitbt(kcondvar_t *, struct kmutex *, struct bintime *,
   53             const struct bintime *);
   54 int     cv_timedwaitbt_sig(kcondvar_t *, struct kmutex *, struct bintime *,
   55             const struct bintime *);
   56 
   57 void    cv_signal(kcondvar_t *);
   58 void    cv_broadcast(kcondvar_t *);
   59 
   60 bool    cv_has_waiters(kcondvar_t *);
   61 bool    cv_is_valid(kcondvar_t *);
   62 
   63 /* The "lightning bolt", awoken once per second by the clock interrupt. */
   64 extern kcondvar_t lbolt;
   65 
   66 #endif  /* _KERNEL */
   67 
   68 #endif /* _SYS_CONDVAR_H_ */

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