/* $NetBSD: coda_kernel.h,v 1.4 2002/11/02 07:18:36 perry Exp $ */ /* * * Coda: an Experimental Distributed File System * Release 3.1 * * Copyright (c) 1987-1998 Carnegie Mellon University * All Rights Reserved * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation, and * that credit is given to Carnegie Mellon University in all documents * and publicity pertaining to direct or indirect use of this code or its * derivatives. * * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS, * SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON * DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF * ANY DERIVATIVE WORK. * * Carnegie Mellon encourages users of this software to return any * improvements or extensions that they make, and to grant Carnegie * Mellon the rights to redistribute these changes without encumbrance. * * @(#) coda/coda_kernel.h,v 1.1.1.1 1998/08/29 21:26:46 rvb Exp $ */ /* Macros to manipulate the queue */ #ifndef INIT_QUEUE struct queue { struct queue *forw, *back; }; #define INIT_QUEUE(head) \ do { \ (head).forw = (struct queue *)&(head); \ (head).back = (struct queue *)&(head); \ } while (/*CONSTCOND*/ 0) #define GETNEXT(head) (head).forw #define EMPTY(head) ((head).forw == &(head)) #define EOQ(el, head) ((struct queue *)(el) == (struct queue *)&(head)) #define INSQUE(el, head) \ do { \ (el).forw = ((head).back)->forw; \ (el).back = (head).back; \ ((head).back)->forw = (struct queue *)&(el); \ (head).back = (struct queue *)&(el); \ } while (/*CONSTCOND*/ 0) #define REMQUE(el) \ do { \ ((el).forw)->back = (el).back; \ (el).back->forw = (el).forw; \ } while (0) #endif