67 lines
2.4 KiB
C
67 lines
2.4 KiB
C
/*
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*
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* Coda: an Experimental Distributed File System
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* Release 3.1
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*
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* Copyright (c) 1987-1998 Carnegie Mellon University
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* All Rights Reserved
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation, and
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* that credit is given to Carnegie Mellon University in all documents
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* and publicity pertaining to direct or indirect use of this code or its
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* derivatives.
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*
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* CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS,
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* SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS
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* FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON
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* DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER
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* RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF
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* ANY DERIVATIVE WORK.
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*
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* Carnegie Mellon encourages users of this software to return any
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* improvements or extensions that they make, and to grant Carnegie
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* Mellon the rights to redistribute these changes without encumbrance.
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*
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* @(#) src/sys/coda/coda_kernel.h,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $
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* $Id: coda_kernel.h,v 1.2 1998/09/02 19:09:53 rvb Exp $
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*
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*/
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/* Macros to manipulate the queue */
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#ifndef INIT_QUEUE
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struct queue {
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struct queue *forw, *back;
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};
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#define INIT_QUEUE(head) \
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do { \
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(head).forw = (struct queue *)&(head); \
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(head).back = (struct queue *)&(head); \
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} while (0)
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#define GETNEXT(head) (head).forw
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#define EMPTY(head) ((head).forw == &(head))
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#define EOQ(el, head) ((struct queue *)(el) == (struct queue *)&(head))
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#define INSQUE(el, head) \
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do { \
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(el).forw = ((head).back)->forw; \
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(el).back = (head).back; \
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((head).back)->forw = (struct queue *)&(el); \
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(head).back = (struct queue *)&(el); \
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} while (0)
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#define REMQUE(el) \
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do { \
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((el).forw)->back = (el).back; \
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(el).back->forw = (el).forw; \
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} while (0)
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#endif
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