+++ /dev/null
-/* $NetBSD: queue.h,v 1.52 2009/04/20 09:56:08 mschuett Exp $ */
-
-/*
- * slirp version: Copy from QEMU, removed all but tail queues.
- */
-
-/*
- * Copyright (c) 1991, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)queue.h 8.5 (Berkeley) 8/20/94
- */
-
-#ifndef QTAILQ_H
-#define QTAILQ_H
-
-/*
- * A tail queue is headed by a pair of pointers, one to the head of the
- * list and the other to the tail of the list. The elements are doubly
- * linked so that an arbitrary element can be removed without a need to
- * traverse the list. New elements can be added to the list before or
- * after an existing element, at the head of the list, or at the end of
- * the list. A tail queue may be traversed in either direction.
- */
-typedef struct QTailQLink {
- void *tql_next;
- struct QTailQLink *tql_prev;
-} QTailQLink;
-
-/*
- * Tail queue definitions. The union acts as a poor man template, as if
- * it were QTailQLink<type>.
- */
-#define QTAILQ_HEAD(name, type) \
- union name { \
- struct type *tqh_first; /* first element */ \
- QTailQLink tqh_circ; /* link for circular backwards list */ \
- }
-
-#define QTAILQ_HEAD_INITIALIZER(head) \
- { .tqh_circ = { NULL, &(head).tqh_circ } }
-
-#define QTAILQ_ENTRY(type) \
- union { \
- struct type *tqe_next; /* next element */ \
- QTailQLink tqe_circ; /* link for circular backwards list */ \
- }
-
-#define QTAILQ_INIT(head) do { \
- (head)->tqh_first = NULL; \
- (head)->tqh_circ.tql_prev = &(head)->tqh_circ; \
-} while (/*CONSTCOND*/0)
-
-#define QTAILQ_INSERT_HEAD(head, elm, field) do { \
- if (((elm)->field.tqe_next = (head)->tqh_first) != NULL) \
- (head)->tqh_first->field.tqe_circ.tql_prev = \
- &(elm)->field.tqe_circ; \
- else \
- (head)->tqh_circ.tql_prev = &(elm)->field.tqe_circ; \
- (head)->tqh_first = (elm); \
- (elm)->field.tqe_circ.tql_prev = &(head)->tqh_circ; \
-} while (/*CONSTCOND*/0)
-
-#define QTAILQ_INSERT_TAIL(head, elm, field) do { \
- (elm)->field.tqe_next = NULL; \
- (elm)->field.tqe_circ.tql_prev = (head)->tqh_circ.tql_prev; \
- (head)->tqh_circ.tql_prev->tql_next = (elm); \
- (head)->tqh_circ.tql_prev = &(elm)->field.tqe_circ; \
-} while (/*CONSTCOND*/0)
-
-#define QTAILQ_INSERT_AFTER(head, listelm, elm, field) do { \
- if (((elm)->field.tqe_next = (listelm)->field.tqe_next) != NULL)\
- (elm)->field.tqe_next->field.tqe_circ.tql_prev = \
- &(elm)->field.tqe_circ; \
- else \
- (head)->tqh_circ.tql_prev = &(elm)->field.tqe_circ; \
- (listelm)->field.tqe_next = (elm); \
- (elm)->field.tqe_circ.tql_prev = &(listelm)->field.tqe_circ; \
-} while (/*CONSTCOND*/0)
-
-#define QTAILQ_INSERT_BEFORE(listelm, elm, field) do { \
- (elm)->field.tqe_circ.tql_prev = (listelm)->field.tqe_circ.tql_prev; \
- (elm)->field.tqe_next = (listelm); \
- (listelm)->field.tqe_circ.tql_prev->tql_next = (elm); \
- (listelm)->field.tqe_circ.tql_prev = &(elm)->field.tqe_circ; \
-} while (/*CONSTCOND*/0)
-
-#define QTAILQ_REMOVE(head, elm, field) do { \
- if (((elm)->field.tqe_next) != NULL) \
- (elm)->field.tqe_next->field.tqe_circ.tql_prev = \
- (elm)->field.tqe_circ.tql_prev; \
- else \
- (head)->tqh_circ.tql_prev = (elm)->field.tqe_circ.tql_prev; \
- (elm)->field.tqe_circ.tql_prev->tql_next = (elm)->field.tqe_next; \
- (elm)->field.tqe_circ.tql_prev = NULL; \
-} while (/*CONSTCOND*/0)
-
-#define QTAILQ_FOREACH(var, head, field) \
- for ((var) = ((head)->tqh_first); \
- (var); \
- (var) = ((var)->field.tqe_next))
-
-#define QTAILQ_FOREACH_SAFE(var, head, field, next_var) \
- for ((var) = ((head)->tqh_first); \
- (var) && ((next_var) = ((var)->field.tqe_next), 1); \
- (var) = (next_var))
-
-#define QTAILQ_FOREACH_REVERSE(var, head, field) \
- for ((var) = QTAILQ_LAST(head); \
- (var); \
- (var) = QTAILQ_PREV(var, field))
-
-#define QTAILQ_FOREACH_REVERSE_SAFE(var, head, field, prev_var) \
- for ((var) = QTAILQ_LAST(head); \
- (var) && ((prev_var) = QTAILQ_PREV(var, field)); \
- (var) = (prev_var))
-
-/*
- * Tail queue access methods.
- */
-#define QTAILQ_EMPTY(head) ((head)->tqh_first == NULL)
-#define QTAILQ_FIRST(head) ((head)->tqh_first)
-#define QTAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
-#define QTAILQ_IN_USE(elm, field) ((elm)->field.tqe_circ.tql_prev != NULL)
-
-#define QTAILQ_LINK_PREV(link) \
- ((link).tql_prev->tql_prev->tql_next)
-#define QTAILQ_LAST(head) \
- ((typeof((head)->tqh_first)) QTAILQ_LINK_PREV((head)->tqh_circ))
-#define QTAILQ_PREV(elm, field) \
- ((typeof((elm)->field.tqe_next)) QTAILQ_LINK_PREV((elm)->field.tqe_circ))
-
-#define field_at_offset(base, offset, type) \
- ((type *) (((char *) (base)) + (offset)))
-
-/*
- * Raw access of elements of a tail queue head. Offsets are all zero
- * because it's a union.
- */
-#define QTAILQ_RAW_FIRST(head) \
- field_at_offset(head, 0, void *)
-#define QTAILQ_RAW_TQH_CIRC(head) \
- field_at_offset(head, 0, QTailQLink)
-
-/*
- * Raw access of elements of a tail entry
- */
-#define QTAILQ_RAW_NEXT(elm, entry) \
- field_at_offset(elm, entry, void *)
-#define QTAILQ_RAW_TQE_CIRC(elm, entry) \
- field_at_offset(elm, entry, QTailQLink)
-/*
- * Tail queue traversal using pointer arithmetic.
- */
-#define QTAILQ_RAW_FOREACH(elm, head, entry) \
- for ((elm) = *QTAILQ_RAW_FIRST(head); \
- (elm); \
- (elm) = *QTAILQ_RAW_NEXT(elm, entry))
-/*
- * Tail queue insertion using pointer arithmetic.
- */
-#define QTAILQ_RAW_INSERT_TAIL(head, elm, entry) do { \
- *QTAILQ_RAW_NEXT(elm, entry) = NULL; \
- QTAILQ_RAW_TQE_CIRC(elm, entry)->tql_prev = QTAILQ_RAW_TQH_CIRC(head)->tql_prev; \
- QTAILQ_RAW_TQH_CIRC(head)->tql_prev->tql_next = (elm); \
- QTAILQ_RAW_TQH_CIRC(head)->tql_prev = QTAILQ_RAW_TQE_CIRC(elm, entry); \
-} while (/*CONSTCOND*/0)
-
-#endif /* QTAILQ_H */
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