mirror of
https://github.com/freebsd/freebsd-src.git
synced 2024-11-29 00:12:45 +00:00
67 lines
2.4 KiB
C
67 lines
2.4 KiB
C
/*
|
|
*
|
|
* 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.
|
|
*
|
|
* @(#) src/sys/coda/coda_kernel.h,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $
|
|
* $FreeBSD$
|
|
*
|
|
*/
|
|
|
|
/* 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 (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 (0)
|
|
|
|
#define REMQUE(el) \
|
|
do { \
|
|
((el).forw)->back = (el).back; \
|
|
(el).back->forw = (el).forw; \
|
|
} while (0)
|
|
|
|
#endif
|