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540 lines
24 KiB
540 lines
24 KiB
/*
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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 1.24.2.4 2000/05/05 01:41:41 archie 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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/*
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* This file defines five types of data structures: singly-linked lists,
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* singly-linked tail queues, lists, tail queues, and circular 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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* A circle 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 after
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* an existing element, at the head of the list, or at the end of the list.
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* A circle queue may be traversed in either direction, but has a more
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* complex end of list detection.
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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 CIRCLEQ
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* _HEAD + + + + +
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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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* _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 definitions.
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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) = (head)->slh_first; (var); (var) = (var)->field.sle_next)
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#define SLIST_INIT(head) { \
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(head)->slh_first = NULL; \
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}
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#define SLIST_INSERT_AFTER(slistelm, elm, field) do { \
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(elm)->field.sle_next = (slistelm)->field.sle_next; \
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(slistelm)->field.sle_next = (elm); \
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} while (0)
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#define SLIST_INSERT_HEAD(head, elm, field) do { \
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(elm)->field.sle_next = (head)->slh_first; \
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(head)->slh_first = (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(head, field) do { \
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(head)->slh_first = (head)->slh_first->field.sle_next; \
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} while (0)
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#define SLIST_REMOVE(head, elm, type, field) do { \
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if ((head)->slh_first == (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 = (head)->slh_first; \
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while( curelm->field.sle_next != (elm) ) \
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curelm = curelm->field.sle_next; \
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curelm->field.sle_next = \
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curelm->field.sle_next->field.sle_next; \
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} \
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} while (0)
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/*
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* Singly-linked Tail queue definitions.
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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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#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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/*
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* Singly-linked Tail queue functions.
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*/
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#define STAILQ_EMPTY(head) ((head)->stqh_first == NULL)
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#define STAILQ_INIT(head) do { \
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(head)->stqh_first = NULL; \
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(head)->stqh_last = &(head)->stqh_first; \
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} while (0)
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#define STAILQ_FIRST(head) ((head)->stqh_first)
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#define STAILQ_LAST(head) (*(head)->stqh_last)
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#define STAILQ_FOREACH(var, head, field) \
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for((var) = (head)->stqh_first; (var); (var) = (var)->field.stqe_next)
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#define STAILQ_INSERT_HEAD(head, elm, field) do { \
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if (((elm)->field.stqe_next = (head)->stqh_first) == NULL) \
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(head)->stqh_last = &(elm)->field.stqe_next; \
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(head)->stqh_first = (elm); \
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} while (0)
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#define STAILQ_INSERT_TAIL(head, elm, field) do { \
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(elm)->field.stqe_next = NULL; \
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*(head)->stqh_last = (elm); \
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(head)->stqh_last = &(elm)->field.stqe_next; \
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} while (0)
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#define STAILQ_INSERT_AFTER(head, tqelm, elm, field) do { \
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if (((elm)->field.stqe_next = (tqelm)->field.stqe_next) == NULL)\
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(head)->stqh_last = &(elm)->field.stqe_next; \
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(tqelm)->field.stqe_next = (elm); \
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} while (0)
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#define STAILQ_NEXT(elm, field) ((elm)->field.stqe_next)
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#define STAILQ_REMOVE_HEAD(head, field) do { \
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if (((head)->stqh_first = \
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(head)->stqh_first->field.stqe_next) == NULL) \
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(head)->stqh_last = &(head)->stqh_first; \
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} while (0)
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#define STAILQ_REMOVE_HEAD_UNTIL(head, elm, field) do { \
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if (((head)->stqh_first = (elm)->field.stqe_next) == NULL) \
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(head)->stqh_last = &(head)->stqh_first; \
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} while (0)
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#define STAILQ_REMOVE(head, elm, type, field) do { \
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if ((head)->stqh_first == (elm)) { \
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STAILQ_REMOVE_HEAD(head, field); \
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} \
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else { \
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struct type *curelm = (head)->stqh_first; \
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while( curelm->field.stqe_next != (elm) ) \
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curelm = curelm->field.stqe_next; \
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if((curelm->field.stqe_next = \
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curelm->field.stqe_next->field.stqe_next) == NULL) \
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(head)->stqh_last = &(curelm)->field.stqe_next; \
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} \
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} while (0)
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/*
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* List definitions.
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*/
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#define LIST_HEAD(name, type) \
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struct name { \
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struct type *lh_first; /* first element */ \
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}
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#define LIST_HEAD_INITIALIZER(head) \
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{ NULL }
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#define LIST_ENTRY(type) \
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struct { \
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struct type *le_next; /* next element */ \
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struct type **le_prev; /* address of previous next element */ \
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}
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/*
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* List functions.
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*/
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#define LIST_EMPTY(head) ((head)->lh_first == NULL)
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#define LIST_FIRST(head) ((head)->lh_first)
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#define LIST_FOREACH(var, head, field) \
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for((var) = (head)->lh_first; (var); (var) = (var)->field.le_next)
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#define LIST_INIT(head) do { \
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(head)->lh_first = NULL; \
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} while (0)
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#define LIST_INSERT_AFTER(listelm, elm, field) do { \
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if (((elm)->field.le_next = (listelm)->field.le_next) != NULL) \
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(listelm)->field.le_next->field.le_prev = \
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&(elm)->field.le_next; \
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(listelm)->field.le_next = (elm); \
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(elm)->field.le_prev = &(listelm)->field.le_next; \
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} while (0)
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#define LIST_INSERT_BEFORE(listelm, elm, field) do { \
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(elm)->field.le_prev = (listelm)->field.le_prev; \
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(elm)->field.le_next = (listelm); \
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*(listelm)->field.le_prev = (elm); \
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(listelm)->field.le_prev = &(elm)->field.le_next; \
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} while (0)
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#define LIST_INSERT_HEAD(head, elm, field) do { \
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if (((elm)->field.le_next = (head)->lh_first) != NULL) \
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(head)->lh_first->field.le_prev = &(elm)->field.le_next;\
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(head)->lh_first = (elm); \
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(elm)->field.le_prev = &(head)->lh_first; \
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} while (0)
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#define LIST_NEXT(elm, field) ((elm)->field.le_next)
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#define LIST_REMOVE(elm, field) do { \
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if ((elm)->field.le_next != NULL) \
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(elm)->field.le_next->field.le_prev = \
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(elm)->field.le_prev; \
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*(elm)->field.le_prev = (elm)->field.le_next; \
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} while (0)
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/*
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* Tail queue definitions.
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*/
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#define TAILQ_HEAD(name, type) \
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struct name { \
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struct type *tqh_first; /* first element */ \
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struct type **tqh_last; /* addr of last next element */ \
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}
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#define TAILQ_HEAD_INITIALIZER(head) \
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{ NULL, &(head).tqh_first }
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#define TAILQ_ENTRY(type) \
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struct { \
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struct type *tqe_next; /* next element */ \
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struct type **tqe_prev; /* address of previous next element */ \
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}
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/*
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* Tail queue functions.
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*/
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#define TAILQ_EMPTY(head) ((head)->tqh_first == NULL)
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#define TAILQ_FOREACH(var, head, field) \
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for (var = TAILQ_FIRST(head); var; var = TAILQ_NEXT(var, field))
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#define TAILQ_FOREACH_REVERSE(var, head, headname, field) \
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for ((var) = TAILQ_LAST((head), headname); \
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(var); \
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(var) = TAILQ_PREV((var), headname, field))
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#define TAILQ_FIRST(head) ((head)->tqh_first)
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#define TAILQ_LAST(head, headname) \
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(*(((struct headname *)((head)->tqh_last))->tqh_last))
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#define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
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#define TAILQ_PREV(elm, headname, field) \
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(*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
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#define TAILQ_INIT(head) do { \
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(head)->tqh_first = NULL; \
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(head)->tqh_last = &(head)->tqh_first; \
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} while (0)
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#define TAILQ_INSERT_HEAD(head, elm, field) do { \
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if (((elm)->field.tqe_next = (head)->tqh_first) != NULL) \
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(head)->tqh_first->field.tqe_prev = \
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&(elm)->field.tqe_next; \
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else \
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(head)->tqh_last = &(elm)->field.tqe_next; \
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(head)->tqh_first = (elm); \
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(elm)->field.tqe_prev = &(head)->tqh_first; \
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} while (0)
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#define TAILQ_INSERT_TAIL(head, elm, field) do { \
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(elm)->field.tqe_next = NULL; \
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(elm)->field.tqe_prev = (head)->tqh_last; \
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*(head)->tqh_last = (elm); \
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(head)->tqh_last = &(elm)->field.tqe_next; \
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} while (0)
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#define TAILQ_INSERT_AFTER(head, listelm, elm, field) do { \
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if (((elm)->field.tqe_next = (listelm)->field.tqe_next) != NULL)\
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(elm)->field.tqe_next->field.tqe_prev = \
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&(elm)->field.tqe_next; \
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else \
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(head)->tqh_last = &(elm)->field.tqe_next; \
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(listelm)->field.tqe_next = (elm); \
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(elm)->field.tqe_prev = &(listelm)->field.tqe_next; \
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} while (0)
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#define TAILQ_INSERT_BEFORE(listelm, elm, field) do { \
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(elm)->field.tqe_prev = (listelm)->field.tqe_prev; \
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(elm)->field.tqe_next = (listelm); \
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*(listelm)->field.tqe_prev = (elm); \
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(listelm)->field.tqe_prev = &(elm)->field.tqe_next; \
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} while (0)
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#define TAILQ_REMOVE(head, elm, field) do { \
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if (((elm)->field.tqe_next) != NULL) \
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(elm)->field.tqe_next->field.tqe_prev = \
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(elm)->field.tqe_prev; \
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else \
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(head)->tqh_last = (elm)->field.tqe_prev; \
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*(elm)->field.tqe_prev = (elm)->field.tqe_next; \
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} while (0)
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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); \
|
|
else \
|
|
(listelm)->field.cqe_next->field.cqe_prev = (elm); \
|
|
(listelm)->field.cqe_next = (elm); \
|
|
} while (0)
|
|
|
|
#define CIRCLEQ_INSERT_BEFORE(head, listelm, elm, field) do { \
|
|
(elm)->field.cqe_next = (listelm); \
|
|
(elm)->field.cqe_prev = (listelm)->field.cqe_prev; \
|
|
if ((listelm)->field.cqe_prev == (void *)(head)) \
|
|
(head)->cqh_first = (elm); \
|
|
else \
|
|
(listelm)->field.cqe_prev->field.cqe_next = (elm); \
|
|
(listelm)->field.cqe_prev = (elm); \
|
|
} while (0)
|
|
|
|
#define CIRCLEQ_INSERT_HEAD(head, elm, field) do { \
|
|
(elm)->field.cqe_next = (head)->cqh_first; \
|
|
(elm)->field.cqe_prev = (void *)(head); \
|
|
if ((head)->cqh_last == (void *)(head)) \
|
|
(head)->cqh_last = (elm); \
|
|
else \
|
|
(head)->cqh_first->field.cqe_prev = (elm); \
|
|
(head)->cqh_first = (elm); \
|
|
} while (0)
|
|
|
|
#define CIRCLEQ_INSERT_TAIL(head, elm, field) do { \
|
|
(elm)->field.cqe_next = (void *)(head); \
|
|
(elm)->field.cqe_prev = (head)->cqh_last; \
|
|
if ((head)->cqh_first == (void *)(head)) \
|
|
(head)->cqh_first = (elm); \
|
|
else \
|
|
(head)->cqh_last->field.cqe_next = (elm); \
|
|
(head)->cqh_last = (elm); \
|
|
} while (0)
|
|
|
|
#define CIRCLEQ_LAST(head) ((head)->cqh_last)
|
|
|
|
#define CIRCLEQ_NEXT(elm,field) ((elm)->field.cqe_next)
|
|
|
|
#define CIRCLEQ_PREV(elm,field) ((elm)->field.cqe_prev)
|
|
|
|
#define CIRCLEQ_REMOVE(head, elm, field) do { \
|
|
if ((elm)->field.cqe_next == (void *)(head)) \
|
|
(head)->cqh_last = (elm)->field.cqe_prev; \
|
|
else \
|
|
(elm)->field.cqe_next->field.cqe_prev = \
|
|
(elm)->field.cqe_prev; \
|
|
if ((elm)->field.cqe_prev == (void *)(head)) \
|
|
(head)->cqh_first = (elm)->field.cqe_next; \
|
|
else \
|
|
(elm)->field.cqe_prev->field.cqe_next = \
|
|
(elm)->field.cqe_next; \
|
|
} while (0)
|
|
|
|
#ifdef KERNEL
|
|
|
|
/*
|
|
* XXX insque() and remque() are an old way of handling certain queues.
|
|
* They bogusly assumes that all queue heads look alike.
|
|
*/
|
|
|
|
struct quehead {
|
|
struct quehead *qh_link;
|
|
struct quehead *qh_rlink;
|
|
};
|
|
|
|
#ifdef __GNUC__
|
|
|
|
static __inline void
|
|
insque(void *a, void *b)
|
|
{
|
|
struct quehead *element = a, *head = b;
|
|
|
|
element->qh_link = head->qh_link;
|
|
element->qh_rlink = head;
|
|
head->qh_link = element;
|
|
element->qh_link->qh_rlink = element;
|
|
}
|
|
|
|
static __inline void
|
|
remque(void *a)
|
|
{
|
|
struct quehead *element = a;
|
|
|
|
element->qh_link->qh_rlink = element->qh_rlink;
|
|
element->qh_rlink->qh_link = element->qh_link;
|
|
element->qh_rlink = 0;
|
|
}
|
|
|
|
#else /* !__GNUC__ */
|
|
|
|
void insque __P((void *a, void *b));
|
|
void remque __P((void *a));
|
|
|
|
#endif /* __GNUC__ */
|
|
|
|
#endif /* KERNEL */
|
|
|
|
#endif /* !_SYS_QUEUE_H_ */
|