coda_kernel.h

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    1 /*      $NetBSD: coda_kernel.h,v 1.5 2005/02/26 23:04:16 perry Exp $    */
    2 
    3 /*
    4  *
    5  *             Coda: an Experimental Distributed File System
    6  *                              Release 3.1
    7  *
    8  *           Copyright (c) 1987-1998 Carnegie Mellon University
    9  *                          All Rights Reserved
   10  *
   11  * Permission  to  use, copy, modify and distribute this software and its
   12  * documentation is hereby granted,  provided  that  both  the  copyright
   13  * notice  and  this  permission  notice  appear  in  all  copies  of the
   14  * software, derivative works or  modified  versions,  and  any  portions
   15  * thereof, and that both notices appear in supporting documentation, and
   16  * that credit is given to Carnegie Mellon University  in  all  documents
   17  * and publicity pertaining to direct or indirect use of this code or its
   18  * derivatives.
   19  *
   20  * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS  KNOWN  TO  HAVE  BUGS,
   21  * SOME  OF  WHICH MAY HAVE SERIOUS CONSEQUENCES.  CARNEGIE MELLON ALLOWS
   22  * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION.   CARNEGIE  MELLON
   23  * DISCLAIMS  ANY  LIABILITY  OF  ANY  KIND  FOR  ANY  DAMAGES WHATSOEVER
   24  * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE  OR  OF
   25  * ANY DERIVATIVE WORK.
   26  *
   27  * Carnegie  Mellon  encourages  users  of  this  software  to return any
   28  * improvements or extensions that  they  make,  and  to  grant  Carnegie
   29  * Mellon the rights to redistribute these changes without encumbrance.
   30  *
   31  *      @(#) coda/coda_kernel.h,v 1.1.1.1 1998/08/29 21:26:46 rvb Exp $
   32  */
   33 
   34 /* Macros to manipulate the queue */
   35 #ifndef INIT_QUEUE
   36 struct queue {
   37     struct queue *forw, *back;
   38 };
   39 
   40 #define INIT_QUEUE(head)                     \
   41 do {                                         \
   42     (head).forw = (struct queue *)&(head);   \
   43     (head).back = (struct queue *)&(head);   \
   44 } while (/*CONSTCOND*/ 0)
   45 
   46 #define GETNEXT(head) (head).forw
   47 
   48 #define EMPTY(head) ((head).forw == &(head))
   49 
   50 #define EOQ(el, head) ((struct queue *)(el) == (struct queue *)&(head))
   51 
   52 #define INSQUE(el, head)                             \
   53 do {                                                 \
   54         (el).forw = ((head).back)->forw;             \
   55         (el).back = (head).back;                     \
   56         ((head).back)->forw = (struct queue *)&(el); \
   57         (head).back = (struct queue *)&(el);         \
   58 } while (/*CONSTCOND*/ 0)
   59 
   60 #define REMQUE(el)                         \
   61 do {                                       \
   62         ((el).forw)->back = (el).back;     \
   63         (el).back->forw = (el).forw;       \
   64 }  while (0)
   65 
   66 #endif

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FreeBSD/Linux Kernel Cross Reference sys/coda/coda_kernel.h

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sys/coda/coda_kernel.h