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 /*-
    2  * Copyright (c) 2000 Jake Burkholder <jake@freebsd.org>.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/8.2/sys/sys/condvar.h 199583 2009-11-20 15:27:52Z jhb $
   27  */
   28 
   29 #ifndef _SYS_CONDVAR_H_
   30 #define _SYS_CONDVAR_H_
   31 
   32 #ifndef LOCORE
   33 #include <sys/queue.h>
   34 
   35 struct lock_object;
   36 struct thread;
   37 
   38 TAILQ_HEAD(cv_waitq, thread);
   39 
   40 /*
   41  * Condition variable.  The waiters count is protected by the mutex that
   42  * protects the condition; that is, the mutex that is passed to cv_wait*()
   43  * and is held across calls to cv_signal() and cv_broadcast().  It is an
   44  * optimization to avoid looking up the sleep queue if there are no waiters.
   45  */
   46 struct cv {
   47         const char      *cv_description;
   48         int             cv_waiters;
   49 };
   50 
   51 #ifdef _KERNEL
   52 void    cv_init(struct cv *cvp, const char *desc);
   53 void    cv_destroy(struct cv *cvp);
   54 
   55 void    _cv_wait(struct cv *cvp, struct lock_object *lock);
   56 void    _cv_wait_unlock(struct cv *cvp, struct lock_object *lock);
   57 int     _cv_wait_sig(struct cv *cvp, struct lock_object *lock);
   58 int     _cv_timedwait(struct cv *cvp, struct lock_object *lock, int timo);
   59 int     _cv_timedwait_sig(struct cv *cvp, struct lock_object *lock, int timo);
   60 
   61 void    cv_signal(struct cv *cvp);
   62 void    cv_broadcastpri(struct cv *cvp, int pri);
   63 
   64 #define cv_wait(cvp, lock)                                              \
   65         _cv_wait((cvp), &(lock)->lock_object)
   66 #define cv_wait_unlock(cvp, lock)                                       \
   67         _cv_wait_unlock((cvp), &(lock)->lock_object)
   68 #define cv_wait_sig(cvp, lock)                                          \
   69         _cv_wait_sig((cvp), &(lock)->lock_object)
   70 #define cv_timedwait(cvp, lock, timo)                                   \
   71         _cv_timedwait((cvp), &(lock)->lock_object, (timo))
   72 #define cv_timedwait_sig(cvp, lock, timo)                               \
   73         _cv_timedwait_sig((cvp), &(lock)->lock_object, (timo))
   74 
   75 #define cv_broadcast(cvp)       cv_broadcastpri(cvp, 0)
   76 
   77 #define cv_wmesg(cvp)           ((cvp)->cv_description)
   78 
   79 #endif  /* _KERNEL */
   80 #endif  /* !LOCORE */
   81 #endif  /* _SYS_CONDVAR_H_ */

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