132 lines
4.8 KiB
C
132 lines
4.8 KiB
C
/*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. 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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* 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS 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, 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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* @(#)queue.h 8.5 (Berkeley) 8/20/94
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* $FreeBSD: ports/misc/44bsd-more/files/queue.h,v 1.1 2001/01/06 03:41:36 hoek Exp $
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*/
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/*
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* Circular queue definitions.
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*/
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#define CIRCLEQ_HEAD(name, type) \
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struct name { \
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struct type *cqh_first; /* first element */ \
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struct type *cqh_last; /* last element */ \
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}
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#define CIRCLEQ_ENTRY(type) \
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struct { \
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struct type *cqe_next; /* next element */ \
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struct type *cqe_prev; /* previous element */ \
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}
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/*
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* Circular queue functions.
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*/
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#define CIRCLEQ_EMPTY(head) ((head)->cqh_first == (void *)(head))
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#define CIRCLEQ_FIRST(head) ((head)->cqh_first)
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#define CIRCLEQ_FOREACH(var, head, field) \
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for((var) = (head)->cqh_first; \
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(var) != (void *)(head); \
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(var) = (var)->field.cqe_next)
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#define CIRCLEQ_FOREACH_REVERSE(var, head, field) \
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for((var) = (head)->cqh_last; \
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(var) != (void *)(head); \
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(var) = (var)->field.cqe_prev)
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#define CIRCLEQ_INIT(head) do { \
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(head)->cqh_first = (void *)(head); \
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(head)->cqh_last = (void *)(head); \
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} while (0)
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#define CIRCLEQ_INSERT_AFTER(head, listelm, elm, field) do { \
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(elm)->field.cqe_next = (listelm)->field.cqe_next; \
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(elm)->field.cqe_prev = (listelm); \
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if ((listelm)->field.cqe_next == (void *)(head)) \
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(head)->cqh_last = (elm); \
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else \
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(listelm)->field.cqe_next->field.cqe_prev = (elm); \
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(listelm)->field.cqe_next = (elm); \
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} while (0)
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#define CIRCLEQ_INSERT_BEFORE(head, listelm, elm, field) do { \
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(elm)->field.cqe_next = (listelm); \
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(elm)->field.cqe_prev = (listelm)->field.cqe_prev; \
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if ((listelm)->field.cqe_prev == (void *)(head)) \
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(head)->cqh_first = (elm); \
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else \
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(listelm)->field.cqe_prev->field.cqe_next = (elm); \
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(listelm)->field.cqe_prev = (elm); \
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} while (0)
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#define CIRCLEQ_INSERT_HEAD(head, elm, field) do { \
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(elm)->field.cqe_next = (head)->cqh_first; \
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(elm)->field.cqe_prev = (void *)(head); \
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if ((head)->cqh_last == (void *)(head)) \
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(head)->cqh_last = (elm); \
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else \
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(head)->cqh_first->field.cqe_prev = (elm); \
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(head)->cqh_first = (elm); \
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} while (0)
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#define CIRCLEQ_INSERT_TAIL(head, elm, field) do { \
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(elm)->field.cqe_next = (void *)(head); \
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(elm)->field.cqe_prev = (head)->cqh_last; \
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if ((head)->cqh_first == (void *)(head)) \
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(head)->cqh_first = (elm); \
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else \
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(head)->cqh_last->field.cqe_next = (elm); \
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(head)->cqh_last = (elm); \
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} while (0)
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#define CIRCLEQ_LAST(head) ((head)->cqh_last)
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#define CIRCLEQ_NEXT(elm,field) ((elm)->field.cqe_next)
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#define CIRCLEQ_PREV(elm,field) ((elm)->field.cqe_prev)
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#define CIRCLEQ_REMOVE(head, elm, field) do { \
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if ((elm)->field.cqe_next == (void *)(head)) \
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(head)->cqh_last = (elm)->field.cqe_prev; \
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else \
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(elm)->field.cqe_next->field.cqe_prev = \
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(elm)->field.cqe_prev; \
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if ((elm)->field.cqe_prev == (void *)(head)) \
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(head)->cqh_first = (elm)->field.cqe_next; \
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else \
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(elm)->field.cqe_prev->field.cqe_next = \
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(elm)->field.cqe_next; \
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} while (0)
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