918f38d037
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
194 lines
9.3 KiB
C
194 lines
9.3 KiB
C
/* $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 */
|