зеркало из https://github.com/mozilla/gecko-dev.git
246 строки
8.4 KiB
C
246 строки
8.4 KiB
C
/*
|
|
* Copyright (c) 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)queue.h 8.3 (Berkeley) 12/13/93
|
|
*/
|
|
|
|
#ifndef _QUEUE_H_
|
|
#define _QUEUE_H_
|
|
|
|
/*
|
|
* This file defines three types of data structures: lists, tail queues,
|
|
* and circular queues.
|
|
*
|
|
* A list is headed by a single forward pointer (or an array of forward
|
|
* pointers for a hash table header). The elements are doubly linked
|
|
* so that an arbitrary element can be removed without a need to
|
|
* traverse the list. New elements can be added to the list after
|
|
* an existing element or at the head of the list. A list may only be
|
|
* traversed in the forward direction.
|
|
*
|
|
* A tail queue is headed by a pair of pointers, one to the head of the
|
|
* list and the other to the tail of the list. The elements are doubly
|
|
* linked so that an arbitrary element can be removed without a need to
|
|
* traverse the list. New elements can be added to the list after
|
|
* an existing element, at the head of the list, or at the end of the
|
|
* list. A tail queue may only be traversed in the forward direction.
|
|
*
|
|
* A circle queue is headed by a pair of pointers, one to the head of the
|
|
* list and the other to the tail of the list. The elements are doubly
|
|
* linked so that an arbitrary element can be removed without a need to
|
|
* traverse the list. New elements can be added to the list before or after
|
|
* an existing element, at the head of the list, or at the end of the list.
|
|
* A circle queue may be traversed in either direction, but has a more
|
|
* complex end of list detection.
|
|
*
|
|
* For details on the use of these macros, see the queue(3) manual page.
|
|
*/
|
|
|
|
/*
|
|
* List definitions.
|
|
*/
|
|
#define LIST_HEAD(name, type) \
|
|
struct name { \
|
|
struct type *lh_first; /* first element */ \
|
|
}
|
|
|
|
#define LIST_ENTRY(type) \
|
|
struct { \
|
|
struct type *le_next; /* next element */ \
|
|
struct type **le_prev; /* address of previous next element */ \
|
|
}
|
|
|
|
/*
|
|
* List functions.
|
|
*/
|
|
#define LIST_INIT(head) { \
|
|
(head)->lh_first = NULL; \
|
|
}
|
|
|
|
#define LIST_INSERT_AFTER(listelm, elm, field) { \
|
|
if (((elm)->field.le_next = (listelm)->field.le_next) != NULL) \
|
|
(listelm)->field.le_next->field.le_prev = \
|
|
&(elm)->field.le_next; \
|
|
(listelm)->field.le_next = (elm); \
|
|
(elm)->field.le_prev = &(listelm)->field.le_next; \
|
|
}
|
|
|
|
#define LIST_INSERT_HEAD(head, elm, field) { \
|
|
if (((elm)->field.le_next = (head)->lh_first) != NULL) \
|
|
(head)->lh_first->field.le_prev = &(elm)->field.le_next;\
|
|
(head)->lh_first = (elm); \
|
|
(elm)->field.le_prev = &(head)->lh_first; \
|
|
}
|
|
|
|
#define LIST_REMOVE(elm, field) { \
|
|
if ((elm)->field.le_next != NULL) \
|
|
(elm)->field.le_next->field.le_prev = \
|
|
(elm)->field.le_prev; \
|
|
*(elm)->field.le_prev = (elm)->field.le_next; \
|
|
}
|
|
|
|
/*
|
|
* Tail queue definitions.
|
|
*/
|
|
#define TAILQ_HEAD(name, type) \
|
|
struct name { \
|
|
struct type *tqh_first; /* first element */ \
|
|
struct type **tqh_last; /* addr of last next element */ \
|
|
}
|
|
|
|
#define TAILQ_ENTRY(type) \
|
|
struct { \
|
|
struct type *tqe_next; /* next element */ \
|
|
struct type **tqe_prev; /* address of previous next element */ \
|
|
}
|
|
|
|
/*
|
|
* Tail queue functions.
|
|
*/
|
|
#define TAILQ_INIT(head) { \
|
|
(head)->tqh_first = NULL; \
|
|
(head)->tqh_last = &(head)->tqh_first; \
|
|
}
|
|
|
|
#define TAILQ_INSERT_HEAD(head, elm, field) { \
|
|
if (((elm)->field.tqe_next = (head)->tqh_first) != NULL) \
|
|
(elm)->field.tqe_next->field.tqe_prev = \
|
|
&(elm)->field.tqe_next; \
|
|
else \
|
|
(head)->tqh_last = &(elm)->field.tqe_next; \
|
|
(head)->tqh_first = (elm); \
|
|
(elm)->field.tqe_prev = &(head)->tqh_first; \
|
|
}
|
|
|
|
#define TAILQ_INSERT_TAIL(head, elm, field) { \
|
|
(elm)->field.tqe_next = NULL; \
|
|
(elm)->field.tqe_prev = (head)->tqh_last; \
|
|
*(head)->tqh_last = (elm); \
|
|
(head)->tqh_last = &(elm)->field.tqe_next; \
|
|
}
|
|
|
|
#define TAILQ_INSERT_AFTER(head, listelm, elm, field) { \
|
|
if (((elm)->field.tqe_next = (listelm)->field.tqe_next) != NULL)\
|
|
(elm)->field.tqe_next->field.tqe_prev = \
|
|
&(elm)->field.tqe_next; \
|
|
else \
|
|
(head)->tqh_last = &(elm)->field.tqe_next; \
|
|
(listelm)->field.tqe_next = (elm); \
|
|
(elm)->field.tqe_prev = &(listelm)->field.tqe_next; \
|
|
}
|
|
|
|
#define TAILQ_REMOVE(head, elm, field) { \
|
|
if (((elm)->field.tqe_next) != NULL) \
|
|
(elm)->field.tqe_next->field.tqe_prev = \
|
|
(elm)->field.tqe_prev; \
|
|
else \
|
|
(head)->tqh_last = (elm)->field.tqe_prev; \
|
|
*(elm)->field.tqe_prev = (elm)->field.tqe_next; \
|
|
}
|
|
|
|
/*
|
|
* Circular queue definitions.
|
|
*/
|
|
#define CIRCLEQ_HEAD(name, type) \
|
|
struct name { \
|
|
struct type *cqh_first; /* first element */ \
|
|
struct type *cqh_last; /* last element */ \
|
|
}
|
|
|
|
#define CIRCLEQ_ENTRY(type) \
|
|
struct { \
|
|
struct type *cqe_next; /* next element */ \
|
|
struct type *cqe_prev; /* previous element */ \
|
|
}
|
|
|
|
/*
|
|
* Circular queue functions.
|
|
*/
|
|
#define CIRCLEQ_INIT(head) { \
|
|
(head)->cqh_first = (void *)(head); \
|
|
(head)->cqh_last = (void *)(head); \
|
|
}
|
|
|
|
#define CIRCLEQ_INSERT_AFTER(head, listelm, elm, field) { \
|
|
(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); \
|
|
}
|
|
|
|
#define CIRCLEQ_INSERT_BEFORE(head, listelm, elm, field) { \
|
|
(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); \
|
|
}
|
|
|
|
#define CIRCLEQ_INSERT_HEAD(head, elm, field) { \
|
|
(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); \
|
|
}
|
|
|
|
#define CIRCLEQ_INSERT_TAIL(head, elm, field) { \
|
|
(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); \
|
|
}
|
|
|
|
#define CIRCLEQ_REMOVE(head, elm, field) { \
|
|
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; \
|
|
}
|
|
#endif /* !_QUEUE_H_ */
|