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Linux内核队列queue.h
一、简介
queue.h是一个非常经典的文件，定义了一系列宏的操作，它定义了一系列的宏操作，实现了链表，尾队列和循环链表。
queue.h定义了5个基本的数据类型：- 单向无尾链表
- 单向有尾链表
- 双向无尾链表
- 双向有尾链表
- 循环链表
queue相关链表/队列的使用流程为：
- 定义自己的结构体
- 在结构体中使用XXXX_ENTRY定义链表/队列成员变量
- 使用XXXX_HEAD定义一个链表/队列头
- 使用XXXX_INIT初始化链表/队列头（也可在定义时初始化）
- 使用相关的INSERT、REMOVE、FOREACH、REPLACE方法操作队列
几种类型支持的操作：
二、SLIST单向无尾链表
2.1 介绍
SLIST是Singly-linked List的缩写，意为单向无尾链表。
SLIST适合数据量非常大并且几乎不需要删除数据的场合，或者当作堆栈使用。
SLIST相关的源码：/* * Singly-linked List definitions. */ #define SLIST_HEAD(name, type) \ struct name { \ struct type *slh_first; /* first element */ \ } #define SLIST_HEAD_INITIALIZER(head) \ { NULL } #define SLIST_ENTRY(type) \ struct { \ struct type *sle_next; /* next element */ \ } /* * Singly-linked List functions. */ #define SLIST_INIT(head) do { \ (head)->slh_first = NULL; \ } while (/*CONSTCOND*/0) #define SLIST_INSERT_AFTER(slistelm, elm, field) do { \ (elm)->field.sle_next = (slistelm)->field.sle_next; \ (slistelm)->field.sle_next = (elm); \ } while (/*CONSTCOND*/0) #define SLIST_INSERT_HEAD(head, elm, field) do { \ (elm)->field.sle_next = (head)->slh_first; \ (head)->slh_first = (elm); \ } while (/*CONSTCOND*/0) #define SLIST_REMOVE_HEAD(head, field) do { \ (head)->slh_first = (head)->slh_first->field.sle_next; \ } while (/*CONSTCOND*/0) #define SLIST_REMOVE(head, elm, type, field) do { \ if ((head)->slh_first == (elm)) { \ SLIST_REMOVE_HEAD((head), field); \ } \ else { \ struct type *curelm = (head)->slh_first; \ while(curelm->field.sle_next != (elm)) \ curelm = curelm->field.sle_next; \ curelm->field.sle_next = \ curelm->field.sle_next->field.sle_next; \ } \ } while (/*CONSTCOND*/0) #define SLIST_FOREACH(var, head, field) \ for ((var) = SLIST_FIRST((head)); \ (var); \ (var) = SLIST_NEXT((var), field) ) #define SLIST_FOREACH_PREVPTR(var, varp, head, field) \ for ((varp) = &SLIST_FIRST((head)); \ ((var) = *(varp)) != NULL; \ (varp) = &SLIST_NEXT((var), field) ) /* * Singly-linked List access methods. */ #define SLIST_EMPTY(head) ((head)->slh_first == NULL) #define SLIST_FIRST(head) ((head)->slh_first) #define SLIST_NEXT(elm, field) ((elm)->field.sle_next)- 1
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2.2 操作
与单向链表相关的宏、方法和函数有：
// definitions SLIST_HEAD(name, type) SLIST_HEAD_INITIALIZER(head) SLIST_ENTRY(type) // access methods SLIST_FIRST(head) SLIST_END(head) SLIST_EMPTY(head) SLIST_NEXT(elm, field) LIST_FOREACH(var, head, field) SLIST_FOREACH_PREVPTR(var, varp, head, field) // functions SLIST_INIT(head) SLIST_INSERT_AFTER(slistelm, elm, field) SLIST_INSERT_HEAD(head, elm, field) SLIST_REMOVE_NEXT(head, elm, field) SLIST_REMOVE_HEAD(head, field) SLIST_REMOVE(head, elm, type, field)- 1
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宏定义说明
- SLIST_HEAD用于定义一个单向链表数据结构体的头变量，该结构体只有一个指针成员slh_first，指向第一个type类型的数据结构；name可以不用（填写）；
- SLIST_HEAD_INITIALIZER用于在定义时初始化SLIST_HEAD定义的数据结构体的头变量；head可以不用填写;
- SLIST_ENTRY则用于定义一个（用户）结构体的成员变量，该成员变量只包含一个指向type类型的指针sle_next；
与单向链表相关的访问方法有6个
- SLIST_FIRST用于获取单向链表的第一个元素；
- SLIST_END定义了尾部的判断标准；
- SLIST_EMPTY用于判断单向链表是否为空：空则返回true，否则返回false；
- SLIST_NEXT用于获取elm元素的下一个元素，field是前面用SLIST_ENTRY定义的成员变量名；
- SLIST_FOREACH用于遍历单向链表，var是临时变量，head是链表头指针（SLIST_HEAD定义的变量），field是SLIST_ENTRY定义的成员变量名；
- SLIST_FOREACH_PREVPTR与SLIST_FOREACH类似，用于遍历单向链表，不过提供更多的一个临时指针变量varp，指向var指向元素的地址；
与单向链表相关的函数有6个
- SLIST_INIT用于初始化SLIST_HEAD定义的头指针变量；当然也可以在使用SLIST_HEAD定义头指针变量时同时使用SLIST_HEAD_INITIALIZER进行初始化；
- SLIST_INSERT_AFTER用于将元素elm插入到当前链表元素slistelm的后面；
- SLIST_INSERT_HEAD用于将元素elm插入到当前链表head的头部；head是SLIST_HEAD定义的链表头指针；
- SLIST_REMOVE_NEXT用于将elm后面的元素删除，head未使用；注意删除时判断elm后面是否还有元素，否则会崩溃;
- SLIST_REMOVE_HEAD用于删除第一个元素；注意删除时判断head是否为空，否则会崩溃;
- SLIST_REMOVE用于从head链表中删除elm元素；注意首先判断elm元素是否在head链表中，否则会崩溃；
2.3 例子
#include#include #include "queue.h" struct SLIST_ITEM { int value; SLIST_ENTRY(SLIST_ITEM) entry; }; int main(void) { int i; SLIST_HEAD(,SLIST_ITEM) slist_head; SLIST_INIT(&slist_head); if (SLIST_EMPTY(&slist_head)) printf("single list is empty\n"); struct SLIST_ITEM *item; struct SLIST_ITEM *item_temp; for( i = 0; i < 10; i += 1) { item = (struct SLIST_ITEM *)malloc(sizeof(struct SLIST_ITEM)); item->value = i; item->entry.sle_next = NULL; SLIST_INSERT_HEAD(&slist_head, item, entry); } printf("after insert 10 item to single list:\n"); SLIST_FOREACH(item, &slist_head, entry) printf("item value = %d\n", item->value); while( SLIST_EMPTY(&slist_head) == 0 ){ item_temp = (&slist_head)->slh_first; SLIST_REMOVE(&slist_head,(&slist_head)->slh_first,SLIST_ITEM,entry); free(item_temp); } printf("here"); if ( SLIST_EMPTY(&slist_head) ) printf("single list is empty\n"); return 0; } - 1
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- SLIST_INSERT_HEAD(&slist_head, item, entry)
从头部插入元素，第一个参数为头节点，第一个参数为要插入的元素，第三个参数为自定义结构体中，自定义的SLIST_ENTRY(SLIST_ITEM)结构体变量名称。 - SLIST_REMOVE(&slist_head,(&slist_head)->slh_first,SLIST_ITEM,entry)
删除对应元素( 内部仅是指针指向的改变，没有真正释放空间 )
三、STAILQ单向有尾链表
STAILQ 是 Singly-linked Tail queue 的缩写，意为单向有尾链表。有尾链表可作队列使用。
STAILQ相关的源码/* * Singly-linked Tail queue declarations. */ #define STAILQ_HEAD(name, type) \ struct name { \ struct type *stqh_first; /* first element */ \ struct type **stqh_last; /* addr of last next element */ \ } #define STAILQ_HEAD_INITIALIZER(head) \ { NULL, &(head).stqh_first } #define STAILQ_ENTRY(type) \ struct { \ struct type *stqe_next; /* next element */ \ } /* * Singly-linked Tail queue functions. */ #define STAILQ_INIT(head) do { \ (head)->stqh_first = NULL; \ (head)->stqh_last = &(head)->stqh_first; \ } while (/*CONSTCOND*/0) #define STAILQ_INSERT_HEAD(head, elm, field) do { \ if (((elm)->field.stqe_next = (head)->stqh_first) == NULL) \ (head)->stqh_last = &(elm)->field.stqe_next; \ (head)->stqh_first = (elm); \ } while (/*CONSTCOND*/0) #define STAILQ_INSERT_TAIL(head, elm, field) do { \ (elm)->field.stqe_next = NULL; \ *(head)->stqh_last = (elm); \ (head)->stqh_last = &(elm)->field.stqe_next; \ } while (/*CONSTCOND*/0) #define STAILQ_INSERT_AFTER(head, listelm, elm, field) do { \ if (((elm)->field.stqe_next = (listelm)->field.stqe_next) == NULL) \ (head)->stqh_last = &(elm)->field.stqe_next; \ (listelm)->field.stqe_next = (elm); \ } while (/*CONSTCOND*/0) #define STAILQ_REMOVE_HEAD(head, field) do { \ if (((head)->stqh_first = (head)->stqh_first->field.stqe_next) == NULL) \ (head)->stqh_last = &(head)->stqh_first; \ } while (/*CONSTCOND*/0) #define STAILQ_REMOVE(head, elm, type, field) do { \ if ((head)->stqh_first == (elm)) { \ STAILQ_REMOVE_HEAD((head), field); \ } else { \ struct type *curelm = (head)->stqh_first; \ while (curelm->field.stqe_next != (elm)) \ curelm = curelm->field.stqe_next; \ if ((curelm->field.stqe_next = \ curelm->field.stqe_next->field.stqe_next) == NULL) \ (head)->stqh_last = &(curelm)->field.stqe_next; \ } \ } while (/*CONSTCOND*/0) #define STAILQ_FOREACH(var, head, field) \ for ((var) = ((head)->stqh_first); \ (var); \ (var) = ((var)->field.stqe_next)) #define STAILQ_CONCAT(head1, head2) do { \ if (!STAILQ_EMPTY((head2))) { \ *(head1)->stqh_last = (head2)->stqh_first; \ (head1)->stqh_last = (head2)->stqh_last; \ STAILQ_INIT((head2)); \ } \ } while (/*CONSTCOND*/0) /* * Singly-linked Tail queue access methods. */ #define STAILQ_EMPTY(head) ((head)->stqh_first == NULL) #define STAILQ_FIRST(head) ((head)->stqh_first) #define STAILQ_NEXT(elm, field) ((elm)->field.stqe_next)- 1
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四、LIST双向无尾链表
双向链表有前向的指针，因此可以执行一些前向操作，而且无需遍历链表便可以删除一些节点。
LIST相关的源码/* * 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)- 1
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五、TAILQ双向有尾链表
TAILQ 是 Tail queue 的缩写，意为双向有尾链表。
有尾链表可作队列使用。
双向有尾链表兼具了双向链表和有尾链表的特点。
TAILQ相关的源码/* * 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_HEAD_INITIALIZER(head) \ { NULL, &(head).tqh_first } #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) 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_REVERSE(var, head, headname, field) \ for ((var) = (*(((struct headname *)((head)->tqh_last))->tqh_last)); \ (var); \ (var) = (*(((struct headname *)((var)->field.tqe_prev))->tqh_last))) #define TAILQ_CONCAT(head1, head2, field) do { \ if (!TAILQ_EMPTY(head2)) { \ *(head1)->tqh_last = (head2)->tqh_first; \ (head2)->tqh_first->field.tqe_prev = (head1)->tqh_last; \ (head1)->tqh_last = (head2)->tqh_last; \ TAILQ_INIT((head2)); \ } \ } while (/*CONSTCOND*/0) /* * 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))- 1
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六、CIRCLEQ循环链表
CIRCLEQ 是 Circular queue 的缩写，意为循环链表。
CIRCLEQ相关的源码/* * 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))- 1
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七、queue源码
在Linux系统中的路径为：/usr/include/sys/queue.h
也可以通过如下网址查看：https://codebrowser.dev/glibc/glibc/misc/sys/queue.h.html
queue.h/* * 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 _QUEUE_H_ #define _QUEUE_H_ /* * This file defines five types of data structures: singly-linked lists, * lists, simple queues, tail queues, and circular queues. * * A singly-linked list is headed by a single forward pointer. The * elements are singly linked for minimum space and pointer manipulation * overhead at the expense of O(n) removal for arbitrary elements. New * elements can be added to the list after an existing element or at the * head of the list. Elements being removed from the head of the list * should use the explicit macro for this purpose for optimum * efficiency. A singly-linked list may only be traversed in the forward * direction. Singly-linked lists are ideal for applications with large * datasets and few or no removals or for implementing a LIFO queue. * * 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 simple queue is headed by a pair of pointers, one the head of the * list and the other to the tail of the list. The elements are singly * linked to save space, so elements can only be removed from the * head of 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 simple queue 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) /* * Singly-linked List definitions. */ #define SLIST_HEAD(name, type) \ struct name { \ struct type *slh_first; /* first element */ \ } #define SLIST_HEAD_INITIALIZER(head) \ { NULL } #define SLIST_ENTRY(type) \ struct { \ struct type *sle_next; /* next element */ \ } /* * Singly-linked List functions. */ #define SLIST_INIT(head) do { \ (head)->slh_first = NULL; \ } while (/*CONSTCOND*/0) #define SLIST_INSERT_AFTER(slistelm, elm, field) do { \ (elm)->field.sle_next = (slistelm)->field.sle_next; \ (slistelm)->field.sle_next = (elm); \ } while (/*CONSTCOND*/0) #define SLIST_INSERT_HEAD(head, elm, field) do { \ (elm)->field.sle_next = (head)->slh_first; \ (head)->slh_first = (elm); \ } while (/*CONSTCOND*/0) #define SLIST_REMOVE_HEAD(head, field) do { \ (head)->slh_first = (head)->slh_first->field.sle_next; \ } while (/*CONSTCOND*/0) #define SLIST_REMOVE(head, elm, type, field) do { \ if ((head)->slh_first == (elm)) { \ SLIST_REMOVE_HEAD((head), field); \ } \ else { \ struct type *curelm = (head)->slh_first; \ while(curelm->field.sle_next != (elm)) \ curelm = curelm->field.sle_next; \ curelm->field.sle_next = \ curelm->field.sle_next->field.sle_next; \ } \ } while (/*CONSTCOND*/0) #define SLIST_FOREACH(var, head, field) \ for((var) = (head)->slh_first; (var); (var) = (var)->field.sle_next) /* * Singly-linked List access methods. */ #define SLIST_EMPTY(head) ((head)->slh_first == NULL) #define SLIST_FIRST(head) ((head)->slh_first) #define SLIST_NEXT(elm, field) ((elm)->field.sle_next) /* * Singly-linked Tail queue declarations. */ #define STAILQ_HEAD(name, type) \ struct name { \ struct type *stqh_first; /* first element */ \ struct type **stqh_last; /* addr of last next element */ \ } #define STAILQ_HEAD_INITIALIZER(head) \ { NULL, &(head).stqh_first } #define STAILQ_ENTRY(type) \ struct { \ struct type *stqe_next; /* next element */ \ } /* * Singly-linked Tail queue functions. */ #define STAILQ_INIT(head) do { \ (head)->stqh_first = NULL; \ (head)->stqh_last = &(head)->stqh_first; \ } while (/*CONSTCOND*/0) #define STAILQ_INSERT_HEAD(head, elm, field) do { \ if (((elm)->field.stqe_next = (head)->stqh_first) == NULL) \ (head)->stqh_last = &(elm)->field.stqe_next; \ (head)->stqh_first = (elm); \ } while (/*CONSTCOND*/0) #define STAILQ_INSERT_TAIL(head, elm, field) do { \ (elm)->field.stqe_next = NULL; \ *(head)->stqh_last = (elm); \ (head)->stqh_last = &(elm)->field.stqe_next; \ } while (/*CONSTCOND*/0) #define STAILQ_INSERT_AFTER(head, listelm, elm, field) do { \ if (((elm)->field.stqe_next = (listelm)->field.stqe_next) == NULL)\ (head)->stqh_last = &(elm)->field.stqe_next; \ (listelm)->field.stqe_next = (elm); \ } while (/*CONSTCOND*/0) #define STAILQ_REMOVE_HEAD(head, field) do { \ if (((head)->stqh_first = (head)->stqh_first->field.stqe_next) == NULL) \ (head)->stqh_last = &(head)->stqh_first; \ } while (/*CONSTCOND*/0) #define STAILQ_REMOVE(head, elm, type, field) do { \ if ((head)->stqh_first == (elm)) { \ STAILQ_REMOVE_HEAD((head), field); \ } else { \ struct type *curelm = (head)->stqh_first; \ while (curelm->field.stqe_next != (elm)) \ curelm = curelm->field.stqe_next; \ if ((curelm->field.stqe_next = \ curelm->field.stqe_next->field.stqe_next) == NULL) \ (head)->stqh_last = &(curelm)->field.stqe_next; \ } \ } while (/*CONSTCOND*/0) #define STAILQ_FOREACH(var, head, field) \ for ((var) = ((head)->stqh_first); \ (var); \ (var) = ((var)->field.stqe_next)) #define STAILQ_CONCAT(head1, head2) do { \ if (!STAILQ_EMPTY((head2))) { \ *(head1)->stqh_last = (head2)->stqh_first; \ (head1)->stqh_last = (head2)->stqh_last; \ STAILQ_INIT((head2)); \ } \ } while (/*CONSTCOND*/0) /* * Singly-linked Tail queue access methods. */ #define STAILQ_EMPTY(head) ((head)->stqh_first == NULL) #define STAILQ_FIRST(head) ((head)->stqh_first) #define STAILQ_NEXT(elm, field) ((elm)->field.stqe_next) /* * Simple queue definitions. */ #define SIMPLEQ_HEAD(name, type) \ struct name { \ struct type *sqh_first; /* first element */ \ struct type **sqh_last; /* addr of last next element */ \ } #define SIMPLEQ_HEAD_INITIALIZER(head) \ { NULL, &(head).sqh_first } #define SIMPLEQ_ENTRY(type) \ struct { \ struct type *sqe_next; /* next element */ \ } /* * Simple queue functions. */ #define SIMPLEQ_INIT(head) do { \ (head)->sqh_first = NULL; \ (head)->sqh_last = &(head)->sqh_first; \ } while (/*CONSTCOND*/0) #define SIMPLEQ_INSERT_HEAD(head, elm, field) do { \ if (((elm)->field.sqe_next = (head)->sqh_first) == NULL) \ (head)->sqh_last = &(elm)->field.sqe_next; \ (head)->sqh_first = (elm); \ } while (/*CONSTCOND*/0) #define SIMPLEQ_INSERT_TAIL(head, elm, field) do { \ (elm)->field.sqe_next = NULL; \ *(head)->sqh_last = (elm); \ (head)->sqh_last = &(elm)->field.sqe_next; \ } while (/*CONSTCOND*/0) #define SIMPLEQ_INSERT_AFTER(head, listelm, elm, field) do { \ if (((elm)->field.sqe_next = (listelm)->field.sqe_next) == NULL)\ (head)->sqh_last = &(elm)->field.sqe_next; \ (listelm)->field.sqe_next = (elm); \ } while (/*CONSTCOND*/0) #define SIMPLEQ_REMOVE_HEAD(head, field) do { \ if (((head)->sqh_first = (head)->sqh_first->field.sqe_next) == NULL) \ (head)->sqh_last = &(head)->sqh_first; \ } while (/*CONSTCOND*/0) #define SIMPLEQ_REMOVE(head, elm, type, field) do { \ if ((head)->sqh_first == (elm)) { \ SIMPLEQ_REMOVE_HEAD((head), field); \ } else { \ struct type *curelm = (head)->sqh_first; \ while (curelm->field.sqe_next != (elm)) \ curelm = curelm->field.sqe_next; \ if ((curelm->field.sqe_next = \ curelm->field.sqe_next->field.sqe_next) == NULL) \ (head)->sqh_last = &(curelm)->field.sqe_next; \ } \ } while (/*CONSTCOND*/0) #define SIMPLEQ_FOREACH(var, head, field) \ for ((var) = ((head)->sqh_first); \ (var); \ (var) = ((var)->field.sqe_next)) /* * Simple queue access methods. */ #define SIMPLEQ_EMPTY(head) ((head)->sqh_first == NULL) #define SIMPLEQ_FIRST(head) ((head)->sqh_first) #define SIMPLEQ_NEXT(elm, field) ((elm)->field.sqe_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_REVERSE(var, head, headname, field) \ for ((var) = (*(((struct headname *)((head)->tqh_last))->tqh_last)); \ (var); \ (var) = (*(((struct headname *)((var)->field.tqe_prev))->tqh_last))) #define TAILQ_CONCAT(head1, head2, field) do { \ if (!TAILQ_EMPTY(head2)) { \ *(head1)->tqh_last = (head2)->tqh_first; \ (head2)->tqh_first->field.tqe_prev = (head1)->tqh_last; \ (head1)->tqh_last = (head2)->tqh_last; \ TAILQ_INIT((head2)); \ } \ } while (/*CONSTCOND*/0) /* * 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 */- 1
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参考
- https://www.codeleading.com/article/52881355491/
- https://blog.csdn.net/tissar/article/details/86978743
-
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- 原文地址：https://blog.csdn.net/first_bug/article/details/136333555
