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207 |
jeremybenn |
/*
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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: src/sys/sys/queue.h,v 1.48 2002/04/17 14:00:37 tmm Exp $
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*/
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#ifndef _SYS_QUEUE_H_
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#define _SYS_QUEUE_H_
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#include <machine/ansi.h> /* for __offsetof */
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/*
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* This file defines four types of data structures: singly-linked lists,
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* singly-linked tail queues, lists and tail queues.
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*
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* A singly-linked list is headed by a single forward pointer. The elements
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* are singly linked for minimum space and pointer manipulation overhead at
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* the expense of O(n) removal for arbitrary elements. New elements can be
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* added to the list after an existing element or at the head of the list.
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* Elements being removed from the head of the list should use the explicit
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* macro for this purpose for optimum efficiency. A singly-linked list may
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* only be traversed in the forward direction. Singly-linked lists are ideal
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* for applications with large datasets and few or no removals or for
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* implementing a LIFO queue.
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*
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* A singly-linked tail queue is headed by a pair of pointers, one to the
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* head of the list and the other to the tail of the list. The elements are
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* singly linked for minimum space and pointer manipulation overhead at the
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* expense of O(n) removal for arbitrary elements. New elements can be added
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* to the list after an existing element, at the head of the list, or at the
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* end of the list. Elements being removed from the head of the tail queue
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* should use the explicit macro for this purpose for optimum efficiency.
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* A singly-linked tail queue may only be traversed in the forward direction.
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* Singly-linked tail queues are ideal for applications with large datasets
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* and few or no removals or for implementing a FIFO queue.
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*
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* A list is headed by a single forward pointer (or an array of forward
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* pointers for a hash table header). The elements are doubly linked
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* so that an arbitrary element can be removed without a need to
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* traverse the list. New elements can be added to the list before
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* or after an existing element or at the head of the list. A list
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* may only be traversed in the forward direction.
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*
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* A tail queue is headed by a pair of pointers, one to the head of the
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* list and the other to the tail of the list. The elements are doubly
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* linked so that an arbitrary element can be removed without a need to
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* traverse the list. New elements can be added to the list before or
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* after an existing element, at the head of the list, or at the end of
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* the list. A tail queue may be traversed in either direction.
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*
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* For details on the use of these macros, see the queue(3) manual page.
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*
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*
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* SLIST LIST STAILQ TAILQ
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* _HEAD + + + +
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* _HEAD_INITIALIZER + + + +
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* _ENTRY + + + +
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* _INIT + + + +
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* _EMPTY + + + +
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* _FIRST + + + +
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* _NEXT + + + +
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* _PREV - - - +
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* _LAST - - + +
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* _FOREACH + + + +
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* _FOREACH_REVERSE - - - +
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* _INSERT_HEAD + + + +
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* _INSERT_BEFORE - + - +
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* _INSERT_AFTER + + + +
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* _INSERT_TAIL - - + +
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* _CONCAT - - + +
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* _REMOVE_HEAD + - + -
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* _REMOVE + + + +
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*
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*/
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/*
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* Singly-linked List declarations.
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*/
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#define SLIST_HEAD(name, type) \
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struct name { \
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struct type *slh_first; /* first element */ \
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}
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#define SLIST_HEAD_INITIALIZER(head) \
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{ NULL }
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#define SLIST_ENTRY(type) \
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struct { \
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struct type *sle_next; /* next element */ \
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}
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/*
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* Singly-linked List functions.
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*/
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#define SLIST_EMPTY(head) ((head)->slh_first == NULL)
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#define SLIST_FIRST(head) ((head)->slh_first)
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#define SLIST_FOREACH(var, head, field) \
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for ((var) = SLIST_FIRST((head)); \
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(var); \
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(var) = SLIST_NEXT((var), field))
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#define SLIST_INIT(head) do { \
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SLIST_FIRST((head)) = NULL; \
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} while (0)
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#define SLIST_INSERT_AFTER(slistelm, elm, field) do { \
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SLIST_NEXT((elm), field) = SLIST_NEXT((slistelm), field); \
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SLIST_NEXT((slistelm), field) = (elm); \
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} while (0)
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#define SLIST_INSERT_HEAD(head, elm, field) do { \
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SLIST_NEXT((elm), field) = SLIST_FIRST((head)); \
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SLIST_FIRST((head)) = (elm); \
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} while (0)
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#define SLIST_NEXT(elm, field) ((elm)->field.sle_next)
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#define SLIST_REMOVE(head, elm, type, field) do { \
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if (SLIST_FIRST((head)) == (elm)) { \
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SLIST_REMOVE_HEAD((head), field); \
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} \
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else { \
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struct type *curelm = SLIST_FIRST((head)); \
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while (SLIST_NEXT(curelm, field) != (elm)) \
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curelm = SLIST_NEXT(curelm, field); \
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SLIST_NEXT(curelm, field) = \
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SLIST_NEXT(SLIST_NEXT(curelm, field), field); \
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} \
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} while (0)
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#define SLIST_REMOVE_HEAD(head, field) do { \
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SLIST_FIRST((head)) = SLIST_NEXT(SLIST_FIRST((head)), field); \
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} while (0)
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/*
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* Singly-linked Tail queue declarations.
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*/
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#define STAILQ_HEAD(name, type) \
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struct name { \
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struct type *stqh_first;/* first element */ \
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struct type **stqh_last;/* addr of last next element */ \
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}
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#define STAILQ_HEAD_INITIALIZER(head) \
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{ NULL, &(head).stqh_first }
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| 179 |
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#define STAILQ_ENTRY(type) \
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struct { \
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struct type *stqe_next; /* next element */ \
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}
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| 184 |
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/*
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* Singly-linked Tail queue functions.
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*/
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#define STAILQ_CONCAT(head1, head2) do { \
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if (!STAILQ_EMPTY((head2))) { \
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*(head1)->stqh_last = (head2)->stqh_first; \
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(head1)->stqh_last = (head2)->stqh_last; \
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STAILQ_INIT((head2)); \
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} \
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} while (0)
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| 195 |
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#define STAILQ_EMPTY(head) ((head)->stqh_first == NULL)
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#define STAILQ_FIRST(head) ((head)->stqh_first)
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| 199 |
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#define STAILQ_FOREACH(var, head, field) \
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for((var) = STAILQ_FIRST((head)); \
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(var); \
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(var) = STAILQ_NEXT((var), field))
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| 204 |
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#define STAILQ_INIT(head) do { \
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STAILQ_FIRST((head)) = NULL; \
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(head)->stqh_last = &STAILQ_FIRST((head)); \
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} while (0)
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| 209 |
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#define STAILQ_INSERT_AFTER(head, tqelm, elm, field) do { \
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if ((STAILQ_NEXT((elm), field) = STAILQ_NEXT((tqelm), field)) == NULL)\
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(head)->stqh_last = &STAILQ_NEXT((elm), field); \
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STAILQ_NEXT((tqelm), field) = (elm); \
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} while (0)
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| 215 |
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#define STAILQ_INSERT_HEAD(head, elm, field) do { \
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| 216 |
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if ((STAILQ_NEXT((elm), field) = STAILQ_FIRST((head))) == NULL) \
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(head)->stqh_last = &STAILQ_NEXT((elm), field); \
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STAILQ_FIRST((head)) = (elm); \
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| 219 |
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} while (0)
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| 220 |
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| 221 |
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#define STAILQ_INSERT_TAIL(head, elm, field) do { \
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| 222 |
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STAILQ_NEXT((elm), field) = NULL; \
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*(head)->stqh_last = (elm); \
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| 224 |
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(head)->stqh_last = &STAILQ_NEXT((elm), field); \
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| 225 |
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} while (0)
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| 226 |
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| 227 |
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#define STAILQ_LAST(head, type, field) \
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| 228 |
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(STAILQ_EMPTY((head)) ? \
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NULL : \
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| 230 |
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((struct type *) \
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| 231 |
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((char *)((head)->stqh_last) - __offsetof(struct type, field))))
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| 232 |
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| 233 |
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#define STAILQ_NEXT(elm, field) ((elm)->field.stqe_next)
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| 234 |
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| 235 |
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#define STAILQ_REMOVE(head, elm, type, field) do { \
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| 236 |
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if (STAILQ_FIRST((head)) == (elm)) { \
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| 237 |
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STAILQ_REMOVE_HEAD((head), field); \
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| 238 |
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} \
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| 239 |
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else { \
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| 240 |
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struct type *curelm = STAILQ_FIRST((head)); \
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| 241 |
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while (STAILQ_NEXT(curelm, field) != (elm)) \
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| 242 |
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curelm = STAILQ_NEXT(curelm, field); \
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| 243 |
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if ((STAILQ_NEXT(curelm, field) = \
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| 244 |
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STAILQ_NEXT(STAILQ_NEXT(curelm, field), field)) == NULL)\
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| 245 |
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(head)->stqh_last = &STAILQ_NEXT((curelm), field);\
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| 246 |
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} \
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| 247 |
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} while (0)
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| 248 |
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| 249 |
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#define STAILQ_REMOVE_HEAD(head, field) do { \
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| 250 |
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if ((STAILQ_FIRST((head)) = \
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| 251 |
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STAILQ_NEXT(STAILQ_FIRST((head)), field)) == NULL) \
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| 252 |
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(head)->stqh_last = &STAILQ_FIRST((head)); \
|
| 253 |
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} while (0)
|
| 254 |
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|
| 255 |
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#define STAILQ_REMOVE_HEAD_UNTIL(head, elm, field) do { \
|
| 256 |
|
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if ((STAILQ_FIRST((head)) = STAILQ_NEXT((elm), field)) == NULL) \
|
| 257 |
|
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(head)->stqh_last = &STAILQ_FIRST((head)); \
|
| 258 |
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} while (0)
|
| 259 |
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|
| 260 |
|
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/*
|
| 261 |
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* List declarations.
|
| 262 |
|
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*/
|
| 263 |
|
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#define LIST_HEAD(name, type) \
|
| 264 |
|
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struct name { \
|
| 265 |
|
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struct type *lh_first; /* first element */ \
|
| 266 |
|
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}
|
| 267 |
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|
|
| 268 |
|
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#define LIST_HEAD_INITIALIZER(head) \
|
| 269 |
|
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{ NULL }
|
| 270 |
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|
| 271 |
|
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#define LIST_ENTRY(type) \
|
| 272 |
|
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struct { \
|
| 273 |
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struct type *le_next; /* next element */ \
|
| 274 |
|
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struct type **le_prev; /* address of previous next element */ \
|
| 275 |
|
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}
|
| 276 |
|
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|
| 277 |
|
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/*
|
| 278 |
|
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* List functions.
|
| 279 |
|
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*/
|
| 280 |
|
|
|
| 281 |
|
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#define LIST_EMPTY(head) ((head)->lh_first == NULL)
|
| 282 |
|
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|
| 283 |
|
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#define LIST_FIRST(head) ((head)->lh_first)
|
| 284 |
|
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|
| 285 |
|
|
#define LIST_FOREACH(var, head, field) \
|
| 286 |
|
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for ((var) = LIST_FIRST((head)); \
|
| 287 |
|
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(var); \
|
| 288 |
|
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(var) = LIST_NEXT((var), field))
|
| 289 |
|
|
|
| 290 |
|
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#define LIST_INIT(head) do { \
|
| 291 |
|
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LIST_FIRST((head)) = NULL; \
|
| 292 |
|
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} while (0)
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| 293 |
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|
| 294 |
|
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#define LIST_INSERT_AFTER(listelm, elm, field) do { \
|
| 295 |
|
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if ((LIST_NEXT((elm), field) = LIST_NEXT((listelm), field)) != NULL)\
|
| 296 |
|
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LIST_NEXT((listelm), field)->field.le_prev = \
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| 297 |
|
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&LIST_NEXT((elm), field); \
|
| 298 |
|
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LIST_NEXT((listelm), field) = (elm); \
|
| 299 |
|
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(elm)->field.le_prev = &LIST_NEXT((listelm), field); \
|
| 300 |
|
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} while (0)
|
| 301 |
|
|
|
| 302 |
|
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#define LIST_INSERT_BEFORE(listelm, elm, field) do { \
|
| 303 |
|
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(elm)->field.le_prev = (listelm)->field.le_prev; \
|
| 304 |
|
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LIST_NEXT((elm), field) = (listelm); \
|
| 305 |
|
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*(listelm)->field.le_prev = (elm); \
|
| 306 |
|
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(listelm)->field.le_prev = &LIST_NEXT((elm), field); \
|
| 307 |
|
|
} while (0)
|
| 308 |
|
|
|
| 309 |
|
|
#define LIST_INSERT_HEAD(head, elm, field) do { \
|
| 310 |
|
|
if ((LIST_NEXT((elm), field) = LIST_FIRST((head))) != NULL) \
|
| 311 |
|
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LIST_FIRST((head))->field.le_prev = &LIST_NEXT((elm), field);\
|
| 312 |
|
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LIST_FIRST((head)) = (elm); \
|
| 313 |
|
|
(elm)->field.le_prev = &LIST_FIRST((head)); \
|
| 314 |
|
|
} while (0)
|
| 315 |
|
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|
| 316 |
|
|
#define LIST_NEXT(elm, field) ((elm)->field.le_next)
|
| 317 |
|
|
|
| 318 |
|
|
#define LIST_REMOVE(elm, field) do { \
|
| 319 |
|
|
if (LIST_NEXT((elm), field) != NULL) \
|
| 320 |
|
|
LIST_NEXT((elm), field)->field.le_prev = \
|
| 321 |
|
|
(elm)->field.le_prev; \
|
| 322 |
|
|
*(elm)->field.le_prev = LIST_NEXT((elm), field); \
|
| 323 |
|
|
} while (0)
|
| 324 |
|
|
|
| 325 |
|
|
/*
|
| 326 |
|
|
* Tail queue declarations.
|
| 327 |
|
|
*/
|
| 328 |
|
|
#define TAILQ_HEAD(name, type) \
|
| 329 |
|
|
struct name { \
|
| 330 |
|
|
struct type *tqh_first; /* first element */ \
|
| 331 |
|
|
struct type **tqh_last; /* addr of last next element */ \
|
| 332 |
|
|
}
|
| 333 |
|
|
|
| 334 |
|
|
#define TAILQ_HEAD_INITIALIZER(head) \
|
| 335 |
|
|
{ NULL, &(head).tqh_first }
|
| 336 |
|
|
|
| 337 |
|
|
#define TAILQ_ENTRY(type) \
|
| 338 |
|
|
struct { \
|
| 339 |
|
|
struct type *tqe_next; /* next element */ \
|
| 340 |
|
|
struct type **tqe_prev; /* address of previous next element */ \
|
| 341 |
|
|
}
|
| 342 |
|
|
|
| 343 |
|
|
/*
|
| 344 |
|
|
* Tail queue functions.
|
| 345 |
|
|
*/
|
| 346 |
|
|
#define TAILQ_CONCAT(head1, head2, field) do { \
|
| 347 |
|
|
if (!TAILQ_EMPTY(head2)) { \
|
| 348 |
|
|
*(head1)->tqh_last = (head2)->tqh_first; \
|
| 349 |
|
|
(head2)->tqh_first->field.tqe_prev = (head1)->tqh_last; \
|
| 350 |
|
|
(head1)->tqh_last = (head2)->tqh_last; \
|
| 351 |
|
|
TAILQ_INIT((head2)); \
|
| 352 |
|
|
} \
|
| 353 |
|
|
} while (0)
|
| 354 |
|
|
|
| 355 |
|
|
#define TAILQ_EMPTY(head) ((head)->tqh_first == NULL)
|
| 356 |
|
|
|
| 357 |
|
|
#define TAILQ_FIRST(head) ((head)->tqh_first)
|
| 358 |
|
|
|
| 359 |
|
|
#define TAILQ_FOREACH(var, head, field) \
|
| 360 |
|
|
for ((var) = TAILQ_FIRST((head)); \
|
| 361 |
|
|
(var); \
|
| 362 |
|
|
(var) = TAILQ_NEXT((var), field))
|
| 363 |
|
|
|
| 364 |
|
|
#define TAILQ_FOREACH_REVERSE(var, head, headname, field) \
|
| 365 |
|
|
for ((var) = TAILQ_LAST((head), headname); \
|
| 366 |
|
|
(var); \
|
| 367 |
|
|
(var) = TAILQ_PREV((var), headname, field))
|
| 368 |
|
|
|
| 369 |
|
|
#define TAILQ_INIT(head) do { \
|
| 370 |
|
|
TAILQ_FIRST((head)) = NULL; \
|
| 371 |
|
|
(head)->tqh_last = &TAILQ_FIRST((head)); \
|
| 372 |
|
|
} while (0)
|
| 373 |
|
|
|
| 374 |
|
|
#define TAILQ_INSERT_AFTER(head, listelm, elm, field) do { \
|
| 375 |
|
|
if ((TAILQ_NEXT((elm), field) = TAILQ_NEXT((listelm), field)) != NULL)\
|
| 376 |
|
|
TAILQ_NEXT((elm), field)->field.tqe_prev = \
|
| 377 |
|
|
&TAILQ_NEXT((elm), field); \
|
| 378 |
|
|
else \
|
| 379 |
|
|
(head)->tqh_last = &TAILQ_NEXT((elm), field); \
|
| 380 |
|
|
TAILQ_NEXT((listelm), field) = (elm); \
|
| 381 |
|
|
(elm)->field.tqe_prev = &TAILQ_NEXT((listelm), field); \
|
| 382 |
|
|
} while (0)
|
| 383 |
|
|
|
| 384 |
|
|
#define TAILQ_INSERT_BEFORE(listelm, elm, field) do { \
|
| 385 |
|
|
(elm)->field.tqe_prev = (listelm)->field.tqe_prev; \
|
| 386 |
|
|
TAILQ_NEXT((elm), field) = (listelm); \
|
| 387 |
|
|
*(listelm)->field.tqe_prev = (elm); \
|
| 388 |
|
|
(listelm)->field.tqe_prev = &TAILQ_NEXT((elm), field); \
|
| 389 |
|
|
} while (0)
|
| 390 |
|
|
|
| 391 |
|
|
#define TAILQ_INSERT_HEAD(head, elm, field) do { \
|
| 392 |
|
|
if ((TAILQ_NEXT((elm), field) = TAILQ_FIRST((head))) != NULL) \
|
| 393 |
|
|
TAILQ_FIRST((head))->field.tqe_prev = \
|
| 394 |
|
|
&TAILQ_NEXT((elm), field); \
|
| 395 |
|
|
else \
|
| 396 |
|
|
(head)->tqh_last = &TAILQ_NEXT((elm), field); \
|
| 397 |
|
|
TAILQ_FIRST((head)) = (elm); \
|
| 398 |
|
|
(elm)->field.tqe_prev = &TAILQ_FIRST((head)); \
|
| 399 |
|
|
} while (0)
|
| 400 |
|
|
|
| 401 |
|
|
#define TAILQ_INSERT_TAIL(head, elm, field) do { \
|
| 402 |
|
|
TAILQ_NEXT((elm), field) = NULL; \
|
| 403 |
|
|
(elm)->field.tqe_prev = (head)->tqh_last; \
|
| 404 |
|
|
*(head)->tqh_last = (elm); \
|
| 405 |
|
|
(head)->tqh_last = &TAILQ_NEXT((elm), field); \
|
| 406 |
|
|
} while (0)
|
| 407 |
|
|
|
| 408 |
|
|
#define TAILQ_LAST(head, headname) \
|
| 409 |
|
|
(*(((struct headname *)((head)->tqh_last))->tqh_last))
|
| 410 |
|
|
|
| 411 |
|
|
#define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
|
| 412 |
|
|
|
| 413 |
|
|
#define TAILQ_PREV(elm, headname, field) \
|
| 414 |
|
|
(*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
|
| 415 |
|
|
|
| 416 |
|
|
#define TAILQ_REMOVE(head, elm, field) do { \
|
| 417 |
|
|
if ((TAILQ_NEXT((elm), field)) != NULL) \
|
| 418 |
|
|
TAILQ_NEXT((elm), field)->field.tqe_prev = \
|
| 419 |
|
|
(elm)->field.tqe_prev; \
|
| 420 |
|
|
else \
|
| 421 |
|
|
(head)->tqh_last = (elm)->field.tqe_prev; \
|
| 422 |
|
|
*(elm)->field.tqe_prev = TAILQ_NEXT((elm), field); \
|
| 423 |
|
|
} while (0)
|
| 424 |
|
|
|
| 425 |
|
|
|
| 426 |
|
|
#ifdef _KERNEL
|
| 427 |
|
|
|
| 428 |
|
|
/*
|
| 429 |
|
|
* XXX insque() and remque() are an old way of handling certain queues.
|
| 430 |
|
|
* They bogusly assumes that all queue heads look alike.
|
| 431 |
|
|
*/
|
| 432 |
|
|
|
| 433 |
|
|
struct quehead {
|
| 434 |
|
|
struct quehead *qh_link;
|
| 435 |
|
|
struct quehead *qh_rlink;
|
| 436 |
|
|
};
|
| 437 |
|
|
|
| 438 |
|
|
#ifdef __GNUC__
|
| 439 |
|
|
|
| 440 |
|
|
static __inline void
|
| 441 |
|
|
insque(void *a, void *b)
|
| 442 |
|
|
{
|
| 443 |
|
|
struct quehead *element = (struct quehead *)a,
|
| 444 |
|
|
*head = (struct quehead *)b;
|
| 445 |
|
|
|
| 446 |
|
|
element->qh_link = head->qh_link;
|
| 447 |
|
|
element->qh_rlink = head;
|
| 448 |
|
|
head->qh_link = element;
|
| 449 |
|
|
element->qh_link->qh_rlink = element;
|
| 450 |
|
|
}
|
| 451 |
|
|
|
| 452 |
|
|
static __inline void
|
| 453 |
|
|
remque(void *a)
|
| 454 |
|
|
{
|
| 455 |
|
|
struct quehead *element = (struct quehead *)a;
|
| 456 |
|
|
|
| 457 |
|
|
element->qh_link->qh_rlink = element->qh_rlink;
|
| 458 |
|
|
element->qh_rlink->qh_link = element->qh_link;
|
| 459 |
|
|
element->qh_rlink = 0;
|
| 460 |
|
|
}
|
| 461 |
|
|
|
| 462 |
|
|
#else /* !__GNUC__ */
|
| 463 |
|
|
|
| 464 |
|
|
void insque(void *a, void *b);
|
| 465 |
|
|
void remque(void *a);
|
| 466 |
|
|
|
| 467 |
|
|
#endif /* __GNUC__ */
|
| 468 |
|
|
|
| 469 |
|
|
#endif /* _KERNEL */
|
| 470 |
|
|
|
| 471 |
|
|
#endif /* !_SYS_QUEUE_H_ */
|
