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/runq.h

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    1 /*-
    2  * Copyright (c) 2001 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  * $FreeBSD$
   27  */
   28 
   29 #ifndef _RUNQ_H_
   30 #define _RUNQ_H_
   31 
   32 #include <machine/runq.h>
   33 
   34 struct kse;
   35 
   36 /*
   37  * Run queue parameters.
   38  */
   39 
   40 #define RQ_NQS          (64)            /* Number of run queues. */
   41 #define RQ_PPQ          (4)             /* Priorities per queue. */
   42 
   43 /*
   44  * Head of run queues.
   45  */
   46 TAILQ_HEAD(rqhead, kse);
   47 
   48 /*
   49  * Bit array which maintains the status of a run queue.  When a queue is
   50  * non-empty the bit corresponding to the queue number will be set.
   51  */
   52 struct rqbits {
   53         rqb_word_t rqb_bits[RQB_LEN];
   54 };
   55 
   56 /*
   57  * Run queue structure.  Contains an array of run queues on which processes
   58  * are placed, and a structure to maintain the status of each queue.
   59  */
   60 struct runq {
   61         struct  rqbits rq_status;
   62         struct  rqhead rq_queues[RQ_NQS];
   63 };
   64 
   65 void    runq_add(struct runq *, struct kse *, int flags);
   66 int     runq_check(struct runq *);
   67 struct  kse *runq_choose(struct runq *);
   68 void    runq_init(struct runq *);
   69 void    runq_remove(struct runq *, struct kse *);
   70 
   71 #endif

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