| /* $NetBSD: queue.h,v 1.45.14.1 2007/07/18 20:13:24 liamjfoy Exp $ */ |
| |
| /* |
| * Qemu version: Copy from netbsd, removed debug code, removed some of |
| * the implementations. Left in lists, tail queues and circular queues. |
| */ |
| |
| /* |
| * Copyright (c) 1991, 1993 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the University nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * @(#)queue.h 8.5 (Berkeley) 8/20/94 |
| */ |
| |
| #ifndef _SYS_QUEUE_H_ |
| #define _SYS_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 before |
| * or 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 before or |
| * after an existing element, at the head of the list, or at the end of |
| * the list. A tail queue may be traversed in either direction. |
| * |
| * 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_HEAD_INITIALIZER(head) \ |
| { NULL } |
| |
| #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) do { \ |
| (head)->lh_first = NULL; \ |
| } while (/*CONSTCOND*/0) |
| |
| #define LIST_INSERT_AFTER(listelm, elm, field) do { \ |
| 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; \ |
| } while (/*CONSTCOND*/0) |
| |
| #define LIST_INSERT_BEFORE(listelm, elm, field) do { \ |
| (elm)->field.le_prev = (listelm)->field.le_prev; \ |
| (elm)->field.le_next = (listelm); \ |
| *(listelm)->field.le_prev = (elm); \ |
| (listelm)->field.le_prev = &(elm)->field.le_next; \ |
| } while (/*CONSTCOND*/0) |
| |
| #define LIST_INSERT_HEAD(head, elm, field) do { \ |
| 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; \ |
| } while (/*CONSTCOND*/0) |
| |
| #define LIST_REMOVE(elm, field) do { \ |
| 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; \ |
| } while (/*CONSTCOND*/0) |
| |
| #define LIST_FOREACH(var, head, field) \ |
| for ((var) = ((head)->lh_first); \ |
| (var); \ |
| (var) = ((var)->field.le_next)) |
| |
| /* |
| * List access methods. |
| */ |
| #define LIST_EMPTY(head) ((head)->lh_first == NULL) |
| #define LIST_FIRST(head) ((head)->lh_first) |
| #define LIST_NEXT(elm, field) ((elm)->field.le_next) |
| |
| |
| /* |
| * Tail queue definitions. |
| */ |
| #define _TAILQ_HEAD(name, type, qual) \ |
| struct name { \ |
| qual type *tqh_first; /* first element */ \ |
| qual type *qual *tqh_last; /* addr of last next element */ \ |
| } |
| #define TAILQ_HEAD(name, type) _TAILQ_HEAD(name, struct type,) |
| |
| #define TAILQ_HEAD_INITIALIZER(head) \ |
| { NULL, &(head).tqh_first } |
| |
| #define _TAILQ_ENTRY(type, qual) \ |
| struct { \ |
| qual type *tqe_next; /* next element */ \ |
| qual type *qual *tqe_prev; /* address of previous next element */\ |
| } |
| #define TAILQ_ENTRY(type) _TAILQ_ENTRY(struct type,) |
| |
| /* |
| * Tail queue functions. |
| */ |
| #define TAILQ_INIT(head) do { \ |
| (head)->tqh_first = NULL; \ |
| (head)->tqh_last = &(head)->tqh_first; \ |
| } while (/*CONSTCOND*/0) |
| |
| #define TAILQ_INSERT_HEAD(head, elm, field) do { \ |
| if (((elm)->field.tqe_next = (head)->tqh_first) != NULL) \ |
| (head)->tqh_first->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; \ |
| } while (/*CONSTCOND*/0) |
| |
| #define TAILQ_INSERT_TAIL(head, elm, field) do { \ |
| (elm)->field.tqe_next = NULL; \ |
| (elm)->field.tqe_prev = (head)->tqh_last; \ |
| *(head)->tqh_last = (elm); \ |
| (head)->tqh_last = &(elm)->field.tqe_next; \ |
| } while (/*CONSTCOND*/0) |
| |
| #define TAILQ_INSERT_AFTER(head, listelm, elm, field) do { \ |
| 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; \ |
| } while (/*CONSTCOND*/0) |
| |
| #define TAILQ_INSERT_BEFORE(listelm, elm, field) do { \ |
| (elm)->field.tqe_prev = (listelm)->field.tqe_prev; \ |
| (elm)->field.tqe_next = (listelm); \ |
| *(listelm)->field.tqe_prev = (elm); \ |
| (listelm)->field.tqe_prev = &(elm)->field.tqe_next; \ |
| } while (/*CONSTCOND*/0) |
| |
| #define TAILQ_REMOVE(head, elm, field) do { \ |
| 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; \ |
| } while (/*CONSTCOND*/0) |
| |
| #define TAILQ_FOREACH(var, head, field) \ |
| for ((var) = ((head)->tqh_first); \ |
| (var); \ |
| (var) = ((var)->field.tqe_next)) |
| |
| #define TAILQ_FOREACH_SAFE(var, head, field, next_var) \ |
| for ((var) = ((head)->tqh_first); \ |
| (var) && ((next_var) = ((var)->field.tqe_next), 1); \ |
| (var) = (next_var)) |
| |
| #define TAILQ_FOREACH_REVERSE(var, head, headname, field) \ |
| for ((var) = (*(((struct headname *)((head)->tqh_last))->tqh_last)); \ |
| (var); \ |
| (var) = (*(((struct headname *)((var)->field.tqe_prev))->tqh_last))) |
| |
| /* |
| * Tail queue access methods. |
| */ |
| #define TAILQ_EMPTY(head) ((head)->tqh_first == NULL) |
| #define TAILQ_FIRST(head) ((head)->tqh_first) |
| #define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next) |
| |
| #define TAILQ_LAST(head, headname) \ |
| (*(((struct headname *)((head)->tqh_last))->tqh_last)) |
| #define TAILQ_PREV(elm, headname, field) \ |
| (*(((struct headname *)((elm)->field.tqe_prev))->tqh_last)) |
| |
| |
| /* |
| * Circular queue definitions. |
| */ |
| #define CIRCLEQ_HEAD(name, type) \ |
| struct name { \ |
| struct type *cqh_first; /* first element */ \ |
| struct type *cqh_last; /* last element */ \ |
| } |
| |
| #define CIRCLEQ_HEAD_INITIALIZER(head) \ |
| { (void *)&head, (void *)&head } |
| |
| #define CIRCLEQ_ENTRY(type) \ |
| 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_ */ |
