1997-09-16 18:57:47 +00:00
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/*
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1999-08-28 01:35:59 +00:00
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* $FreeBSD$
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1997-09-16 18:57:47 +00:00
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*
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* Copyright (c) 1997 FreeBSD, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer,
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* verbatim and that no modifications are made prior to this
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* point in the file.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY PAUL TRAINA ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL PAUL TRAINA OR HIS KILLER RATS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, LIFE OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/* The structure */
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typedef struct _qelement {
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struct _qelement *q_forw;
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struct _qelement *q_back;
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} qelement;
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#define INITQUE(Xhead) { \
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(Xhead).q_forw = &(Xhead); \
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(Xhead).q_back = &(Xhead); \
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}
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#define EMPTYQUE(Xhead) \
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((Xhead).q_forw == &(Xhead))
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#define INSQUEUE(elem, pred) { \
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register qelement *Xe = (qelement *) (elem); \
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register qelement *Xp = (qelement *) (pred); \
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Xp->q_forw = (Xe->q_forw = (Xe->q_back = Xp)->q_forw)->q_back = Xe; \
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}
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#define REMQUE(elem) { \
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register qelement *Xe = (qelement *) (elem); \
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(Xe->q_back->q_forw = Xe->q_forw)->q_back = Xe->q_back; \
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}
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