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575 lines
19 KiB
C
575 lines
19 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. 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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*/
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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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* lists, simple queues, 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
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* elements are singly linked for minimum space and pointer manipulation
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* overhead at the expense of O(n) removal for arbitrary elements. New
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* elements can be added to the list after an existing element or at the
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* head of the list. Elements being removed from the head of the list
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* should use the explicit macro for this purpose for optimum
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* efficiency. A singly-linked list may only be traversed in the forward
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* direction. Singly-linked lists are ideal for applications with large
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* datasets and few or no removals or for implementing a LIFO 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 simple queue is headed by a pair of pointers, one the head of the
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* list and the other to the tail of the list. The elements are singly
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* linked to save space, so elements can only be removed from the
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* head of the list. New elements can be added to the list after
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* an existing element, at the head of the list, or at the end of the
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* list. A simple queue 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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* 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_INIT(head) do { \
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(head)->lh_first = NULL; \
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} while (/*CONSTCOND*/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 (/*CONSTCOND*/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 (/*CONSTCOND*/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 (/*CONSTCOND*/0)
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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 (/*CONSTCOND*/0)
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#define LIST_FOREACH(var, head, field) \
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for ((var) = ((head)->lh_first); \
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(var); \
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(var) = ((var)->field.le_next))
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/*
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* List access methods.
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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_NEXT(elm, field) ((elm)->field.le_next)
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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_INIT(head) do { \
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(head)->slh_first = NULL; \
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} while (/*CONSTCOND*/0)
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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 (/*CONSTCOND*/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 (/*CONSTCOND*/0)
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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 (/*CONSTCOND*/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 (/*CONSTCOND*/0)
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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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/*
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* Singly-linked List access methods.
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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_NEXT(elm, field) ((elm)->field.sle_next)
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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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#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_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 (/*CONSTCOND*/0)
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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 (/*CONSTCOND*/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 (/*CONSTCOND*/0)
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#define STAILQ_INSERT_AFTER(head, listelm, elm, field) do { \
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if (((elm)->field.stqe_next = (listelm)->field.stqe_next) == NULL)\
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(head)->stqh_last = &(elm)->field.stqe_next; \
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(listelm)->field.stqe_next = (elm); \
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} while (/*CONSTCOND*/0)
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#define STAILQ_REMOVE_HEAD(head, field) do { \
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if (((head)->stqh_first = (head)->stqh_first->field.stqe_next) == NULL) \
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(head)->stqh_last = &(head)->stqh_first; \
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} while (/*CONSTCOND*/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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} 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 (/*CONSTCOND*/0)
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#define STAILQ_FOREACH(var, head, field) \
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for ((var) = ((head)->stqh_first); \
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(var); \
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(var) = ((var)->field.stqe_next))
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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 (/*CONSTCOND*/0)
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/*
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* Singly-linked Tail queue access methods.
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*/
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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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#define STAILQ_NEXT(elm, field) ((elm)->field.stqe_next)
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/*
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* Simple queue definitions.
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*/
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#define SIMPLEQ_HEAD(name, type) \
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struct name { \
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struct type *sqh_first; /* first element */ \
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struct type **sqh_last; /* addr of last next element */ \
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}
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#define SIMPLEQ_HEAD_INITIALIZER(head) \
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{ NULL, &(head).sqh_first }
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#define SIMPLEQ_ENTRY(type) \
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struct { \
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struct type *sqe_next; /* next element */ \
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}
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/*
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* Simple queue functions.
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*/
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#define SIMPLEQ_INIT(head) do { \
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(head)->sqh_first = NULL; \
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(head)->sqh_last = &(head)->sqh_first; \
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} while (/*CONSTCOND*/0)
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#define SIMPLEQ_INSERT_HEAD(head, elm, field) do { \
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if (((elm)->field.sqe_next = (head)->sqh_first) == NULL) \
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(head)->sqh_last = &(elm)->field.sqe_next; \
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(head)->sqh_first = (elm); \
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} while (/*CONSTCOND*/0)
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#define SIMPLEQ_INSERT_TAIL(head, elm, field) do { \
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(elm)->field.sqe_next = NULL; \
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*(head)->sqh_last = (elm); \
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(head)->sqh_last = &(elm)->field.sqe_next; \
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} while (/*CONSTCOND*/0)
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#define SIMPLEQ_INSERT_AFTER(head, listelm, elm, field) do { \
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if (((elm)->field.sqe_next = (listelm)->field.sqe_next) == NULL)\
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(head)->sqh_last = &(elm)->field.sqe_next; \
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(listelm)->field.sqe_next = (elm); \
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} while (/*CONSTCOND*/0)
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#define SIMPLEQ_REMOVE_HEAD(head, field) do { \
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if (((head)->sqh_first = (head)->sqh_first->field.sqe_next) == NULL) \
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(head)->sqh_last = &(head)->sqh_first; \
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} while (/*CONSTCOND*/0)
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#define SIMPLEQ_REMOVE(head, elm, type, field) do { \
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if ((head)->sqh_first == (elm)) { \
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SIMPLEQ_REMOVE_HEAD((head), field); \
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} else { \
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struct type *curelm = (head)->sqh_first; \
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while (curelm->field.sqe_next != (elm)) \
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curelm = curelm->field.sqe_next; \
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if ((curelm->field.sqe_next = \
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curelm->field.sqe_next->field.sqe_next) == NULL) \
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(head)->sqh_last = &(curelm)->field.sqe_next; \
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} \
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} while (/*CONSTCOND*/0)
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#define SIMPLEQ_FOREACH(var, head, field) \
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for ((var) = ((head)->sqh_first); \
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(var); \
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(var) = ((var)->field.sqe_next))
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/*
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* Simple queue access methods.
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*/
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#define SIMPLEQ_EMPTY(head) ((head)->sqh_first == NULL)
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#define SIMPLEQ_FIRST(head) ((head)->sqh_first)
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#define SIMPLEQ_NEXT(elm, field) ((elm)->field.sqe_next)
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/*
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* Tail queue definitions.
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*/
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#define _TAILQ_HEAD(name, type, qual) \
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struct name { \
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qual type *tqh_first; /* first element */ \
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qual type *qual *tqh_last; /* addr of last next element */ \
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}
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#define TAILQ_HEAD(name, type) _TAILQ_HEAD(name, struct type,)
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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, qual) \
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struct { \
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qual type *tqe_next; /* next element */ \
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qual type *qual *tqe_prev; /* address of previous next element */\
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}
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#define TAILQ_ENTRY(type) _TAILQ_ENTRY(struct type,)
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/*
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* Tail queue functions.
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*/
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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 (/*CONSTCOND*/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 (/*CONSTCOND*/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 (/*CONSTCOND*/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 (/*CONSTCOND*/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 (/*CONSTCOND*/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 (/*CONSTCOND*/0)
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#define TAILQ_FOREACH(var, head, field) \
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for ((var) = ((head)->tqh_first); \
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|
(var); \
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|
(var) = ((var)->field.tqe_next))
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|
|
|
#define TAILQ_FOREACH_REVERSE(var, head, headname, field) \
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|
for ((var) = (*(((struct headname *)((head)->tqh_last))->tqh_last)); \
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|
(var); \
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|
(var) = (*(((struct headname *)((var)->field.tqe_prev))->tqh_last)))
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|
|
|
#define TAILQ_CONCAT(head1, head2, field) do { \
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|
if (!TAILQ_EMPTY(head2)) { \
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|
*(head1)->tqh_last = (head2)->tqh_first; \
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|
(head2)->tqh_first->field.tqe_prev = (head1)->tqh_last; \
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|
(head1)->tqh_last = (head2)->tqh_last; \
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|
TAILQ_INIT((head2)); \
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|
} \
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|
} while (/*CONSTCOND*/0)
|
|
|
|
/*
|
|
* Tail queue access methods.
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|
*/
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|
#define TAILQ_EMPTY(head) ((head)->tqh_first == NULL)
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|
#define TAILQ_FIRST(head) ((head)->tqh_first)
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|
#define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
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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_PREV(elm, headname, field) \
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|
(*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
|
|
|
|
|
|
/*
|
|
* Circular queue definitions.
|
|
*/
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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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|
}
|
|
|
|
#define CIRCLEQ_HEAD_INITIALIZER(head) \
|
|
{ (void *)&head, (void *)&head }
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|
|
|
#define CIRCLEQ_ENTRY(type) \
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|
struct { \
|
|
struct type *cqe_next; /* next element */ \
|
|
struct type *cqe_prev; /* previous element */ \
|
|
}
|
|
|
|
/*
|
|
* Circular queue functions.
|
|
*/
|
|
#define CIRCLEQ_INIT(head) do { \
|
|
(head)->cqh_first = (void *)(head); \
|
|
(head)->cqh_last = (void *)(head); \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define CIRCLEQ_INSERT_AFTER(head, listelm, elm, field) do { \
|
|
(elm)->field.cqe_next = (listelm)->field.cqe_next; \
|
|
(elm)->field.cqe_prev = (listelm); \
|
|
if ((listelm)->field.cqe_next == (void *)(head)) \
|
|
(head)->cqh_last = (elm); \
|
|
else \
|
|
(listelm)->field.cqe_next->field.cqe_prev = (elm); \
|
|
(listelm)->field.cqe_next = (elm); \
|
|
} while (/*CONSTCOND*/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 (/*CONSTCOND*/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 (/*CONSTCOND*/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 (/*CONSTCOND*/0)
|
|
|
|
#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 (/*CONSTCOND*/0)
|
|
|
|
#define CIRCLEQ_FOREACH(var, head, field) \
|
|
for ((var) = ((head)->cqh_first); \
|
|
(var) != (const void *)(head); \
|
|
(var) = ((var)->field.cqe_next))
|
|
|
|
#define CIRCLEQ_FOREACH_REVERSE(var, head, field) \
|
|
for ((var) = ((head)->cqh_last); \
|
|
(var) != (const void *)(head); \
|
|
(var) = ((var)->field.cqe_prev))
|
|
|
|
/*
|
|
* Circular queue access methods.
|
|
*/
|
|
#define CIRCLEQ_EMPTY(head) ((head)->cqh_first == (void *)(head))
|
|
#define CIRCLEQ_FIRST(head) ((head)->cqh_first)
|
|
#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_LOOP_NEXT(head, elm, field) \
|
|
(((elm)->field.cqe_next == (void *)(head)) \
|
|
? ((head)->cqh_first) \
|
|
: (elm->field.cqe_next))
|
|
#define CIRCLEQ_LOOP_PREV(head, elm, field) \
|
|
(((elm)->field.cqe_prev == (void *)(head)) \
|
|
? ((head)->cqh_last) \
|
|
: (elm->field.cqe_prev))
|
|
|
|
#endif /* sys/queue.h */
|