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 1.10 2008/05/31 13:36:25 ad Exp $  */
    2 
    3 /*-
    4  * Copyright (c) 2006, 2007, 2008 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 #include <sys/mutex.h>
   36 
   37 /*
   38  * The condition variable implementation is private to kern_condvar.c but
   39  * the size of a kcondvar_t must remain constant.  cv_opaque is protected
   40  * both by the interlock passed to cv_wait() (enqueue only), and the sleep
   41  * queue lock acquired with sleeptab_lookup() (enqueue and dequeue). 
   42  * cv_wmesg is static and does not change throughout the life of the CV.
   43  */
   44 typedef struct kcondvar {
   45         void            *cv_opaque[2];  /* sleep queue */
   46         const char      *cv_wmesg;      /* description for /bin/ps */
   47 } kcondvar_t;
   48 
   49 #ifdef _KERNEL
   50 
   51 void    cv_init(kcondvar_t *, const char *);
   52 void    cv_destroy(kcondvar_t *);
   53 
   54 void    cv_wait(kcondvar_t *, kmutex_t *);
   55 int     cv_wait_sig(kcondvar_t *, kmutex_t *);
   56 int     cv_timedwait(kcondvar_t *, kmutex_t *, int);
   57 int     cv_timedwait_sig(kcondvar_t *, kmutex_t *, int);
   58 
   59 void    cv_signal(kcondvar_t *);
   60 void    cv_broadcast(kcondvar_t *);
   61 
   62 void    cv_wakeup(kcondvar_t *);
   63 
   64 bool    cv_has_waiters(kcondvar_t *);
   65 bool    cv_is_valid(kcondvar_t *);
   66 
   67 /* The "lightning bolt", awoken once per second by the clock interrupt. */
   68 extern kcondvar_t lbolt;
   69 
   70 #endif  /* _KERNEL */
   71 
   72 #endif /* _SYS_CONDVAR_H_ */

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