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/coda/coda_kernel.h

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    1 /*-
    2  * 
    3  *             Coda: an Experimental Distributed File System
    4  *                              Release 3.1
    5  * 
    6  *           Copyright (c) 1987-1998 Carnegie Mellon University
    7  *                          All Rights Reserved
    8  * 
    9  * Permission  to  use, copy, modify and distribute this software and its
   10  * documentation is hereby granted,  provided  that  both  the  copyright
   11  * notice  and  this  permission  notice  appear  in  all  copies  of the
   12  * software, derivative works or  modified  versions,  and  any  portions
   13  * thereof, and that both notices appear in supporting documentation, and
   14  * that credit is given to Carnegie Mellon University  in  all  documents
   15  * and publicity pertaining to direct or indirect use of this code or its
   16  * derivatives.
   17  * 
   18  * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS  KNOWN  TO  HAVE  BUGS,
   19  * SOME  OF  WHICH MAY HAVE SERIOUS CONSEQUENCES.  CARNEGIE MELLON ALLOWS
   20  * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION.   CARNEGIE  MELLON
   21  * DISCLAIMS  ANY  LIABILITY  OF  ANY  KIND  FOR  ANY  DAMAGES WHATSOEVER
   22  * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE  OR  OF
   23  * ANY DERIVATIVE WORK.
   24  * 
   25  * Carnegie  Mellon  encourages  users  of  this  software  to return any
   26  * improvements or extensions that  they  make,  and  to  grant  Carnegie
   27  * Mellon the rights to redistribute these changes without encumbrance.
   28  * 
   29  *      @(#) src/sys/coda/coda_kernel.h,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $ 
   30  * $FreeBSD$
   31  * 
   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 (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 (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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