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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2000 Jake Burkholder <jake@freebsd.org>.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD$
   29  */
   30 
   31 #ifndef _SYS_CONDVAR_H_
   32 #define _SYS_CONDVAR_H_
   33 
   34 #ifndef LOCORE
   35 #include <sys/queue.h>
   36 
   37 struct lock_object;
   38 struct thread;
   39 
   40 TAILQ_HEAD(cv_waitq, thread);
   41 
   42 /*
   43  * Condition variable.  The waiters count is protected by the mutex that
   44  * protects the condition; that is, the mutex that is passed to cv_wait*()
   45  * and is held across calls to cv_signal() and cv_broadcast().  It is an
   46  * optimization to avoid looking up the sleep queue if there are no waiters.
   47  */
   48 struct cv {
   49         const char      *cv_description;
   50         int             cv_waiters;
   51 };
   52 
   53 #ifdef _KERNEL
   54 void    cv_init(struct cv *cvp, const char *desc);
   55 void    cv_destroy(struct cv *cvp);
   56 
   57 void    _cv_wait(struct cv *cvp, struct lock_object *lock);
   58 void    _cv_wait_unlock(struct cv *cvp, struct lock_object *lock);
   59 int     _cv_wait_sig(struct cv *cvp, struct lock_object *lock);
   60 int     _cv_timedwait_sbt(struct cv *cvp, struct lock_object *lock,
   61             sbintime_t sbt, sbintime_t pr, int flags);
   62 int     _cv_timedwait_sig_sbt(struct cv *cvp, struct lock_object *lock,
   63             sbintime_t sbt, sbintime_t pr, int flags);
   64 
   65 void    cv_signal(struct cv *cvp);
   66 void    cv_broadcastpri(struct cv *cvp, int pri);
   67 
   68 #define cv_wait(cvp, lock)                                              \
   69         _cv_wait((cvp), &(lock)->lock_object)
   70 #define cv_wait_unlock(cvp, lock)                                       \
   71         _cv_wait_unlock((cvp), &(lock)->lock_object)
   72 #define cv_wait_sig(cvp, lock)                                          \
   73         _cv_wait_sig((cvp), &(lock)->lock_object)
   74 #define cv_timedwait(cvp, lock, timo)                                   \
   75         _cv_timedwait_sbt((cvp), &(lock)->lock_object,                  \
   76             tick_sbt * (timo), 0, C_HARDCLOCK)
   77 #define cv_timedwait_sbt(cvp, lock, sbt, pr, flags)                     \
   78         _cv_timedwait_sbt((cvp), &(lock)->lock_object, (sbt), (pr), (flags))
   79 #define cv_timedwait_sig(cvp, lock, timo)                               \
   80         _cv_timedwait_sig_sbt((cvp), &(lock)->lock_object,              \
   81             tick_sbt * (timo), 0, C_HARDCLOCK)
   82 #define cv_timedwait_sig_sbt(cvp, lock, sbt, pr, flags)                 \
   83         _cv_timedwait_sig_sbt((cvp), &(lock)->lock_object, (sbt), (pr), (flags))
   84 
   85 #define cv_broadcast(cvp)       cv_broadcastpri(cvp, 0)
   86 
   87 #define cv_wmesg(cvp)           ((cvp)->cv_description)
   88 
   89 #endif  /* _KERNEL */
   90 #endif  /* !LOCORE */
   91 #endif  /* _SYS_CONDVAR_H_ */

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