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/*
 * 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     8.5 (Berkeley) 8/20/94
 * $Id: queue.h,v 1.2 2001-09-27 12:02:00 chris Exp $
 */
 
#ifndef _SYS_QUEUE_H_
#define _SYS_QUEUE_H_
 
/*
 * This file defines five types of data structures: singly-linked lists,
 * slingly-linked tail queues, lists, 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 singly-linked 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
 * 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, at the head of the list, or at the
 * end of the list. Elements being removed from the head of the tail queue
 * should use the explicit macro for this purpose for optimum efficiency.
 * A singly-linked tail queue may only be traversed in the forward direction.
 * Singly-linked tail queues are ideal for applications with large datasets
 * and few or no removals or for implementing a FIFO 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 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 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.
 */
 
/*
 * Singly-linked List definitions.
 */
#define SLIST_HEAD(name, type)                                          \
struct name {                                                           \
        struct type *slh_first; /* first element */                     \
}
 
#define SLIST_ENTRY(type)                                               \
struct {                                                                \
        struct type *sle_next;  /* next element */                      \
}
 
/*
 * Singly-linked List functions.
 */
#define SLIST_INIT(head) {                                              \
        (head)->slh_first = NULL;                                       \
}
 
#define SLIST_INSERT_AFTER(slistelm, elm, field) {                      \
        (elm)->field.sle_next = (slistelm)->field.sle_next;             \
        (slistelm)->field.sle_next = (elm);                             \
}
 
#define SLIST_INSERT_HEAD(head, elm, field) {                           \
        (elm)->field.sle_next = (head)->slh_first;                      \
        (head)->slh_first = (elm);                                      \
}
 
#define SLIST_REMOVE_HEAD(head, field) {                                \
        (head)->slh_first = (head)->slh_first->field.sle_next;          \
}
 
#define SLIST_REMOVE(head, elm, type, field) {                          \
        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;             \
        }                                                               \
}
 
/*
 * Singly-linked Tail queue definitions.
 */
#define STAILQ_HEAD(name, type)                                         \
struct name {                                                           \
        struct type *stqh_first;/* first element */                     \
        struct type **stqh_last;/* addr of last next element */         \
}
 
#define STAILQ_ENTRY(type)                                              \
struct {                                                                \
        struct type *stqe_next; /* next element */                      \
}
 
/*
 * Singly-linked Tail queue functions.
 */
#define STAILQ_INIT(head) {                                             \
        (head)->stqh_first = NULL;                                      \
        (head)->stqh_last = &(head)->stqh_first;                        \
}
 
#define STAILQ_INSERT_HEAD(head, elm, field) {                          \
        if (((elm)->field.stqe_next = (head)->stqh_first) == NULL)      \
                (head)->stqh_last = &(elm)->field.stqe_next;            \
        (head)->stqh_first = (elm);                                     \
}
 
#define STAILQ_INSERT_TAIL(head, elm, field) {                          \
        (elm)->field.stqe_next = NULL;                                  \
        *(head)->stqh_last = (elm);                                     \
        (head)->stqh_last = &(elm)->field.stqe_next;                    \
}
 
#define STAILQ_INSERT_AFTER(head, tqelm, elm, field) {                  \
        if (((elm)->field.stqe_next = (tqelm)->field.stqe_next) == NULL)\
                (head)->stqh_last = &(elm)->field.stqe_next;            \
        (tqelm)->field.stqe_next = (elm);                               \
}
 
#define STAILQ_REMOVE_HEAD(head, field) {                               \
        if (((head)->stqh_first =                                       \
             (head)->stqh_first->field.stqe_next) == NULL)              \
                (head)->stqh_last = &(head)->stqh_first;                \
}
 
#define STAILQ_REMOVE(head, elm, type, field) {                         \
        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; \
        }                                                               \
}
 
/*
 * 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_BEFORE(listelm, elm, field) {                       \
        (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;               \
}
 
#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_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_EMPTY(head) ((head)->tqh_first == NULL)
 
#define TAILQ_FIRST(head) ((head)->tqh_first)
 
#define TAILQ_LAST(head) ((head)->tqh_last)
 
#define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
 
#define TAILQ_PREV(elm, field) ((elm)->field.tqe_prev)
 
#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)        \
                (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;                     \
}
 
#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_INSERT_BEFORE(listelm, elm, field) {                      \
        (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;             \
}
 
#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;                              \
}
 
#ifdef KERNEL
 
/*
 * XXX insque() and remque() are an old way of handling certain queues.
 * They bogusly assumes that all queue heads look alike.
 */
 
struct quehead {
        struct quehead *qh_link;
        struct quehead *qh_rlink;
};
 
#ifdef  __GNUC__
 
static __inline void
insque(void *a, void *b)
{
        struct quehead *element = a, *head = b;
 
        element->qh_link = head->qh_link;
        element->qh_rlink = head;
        head->qh_link = element;
        element->qh_link->qh_rlink = element;
}
 
static __inline void
remque(void *a)
{
        struct quehead *element = a;
 
        element->qh_link->qh_rlink = element->qh_rlink;
        element->qh_rlink->qh_link = element->qh_link;
        element->qh_rlink = 0;
}
 
#else /* !__GNUC__ */
 
void    insque __P((void *a, void *b));
void    remque __P((void *a));
 
#endif /* __GNUC__ */
 
#endif /* KERNEL */
 
#endif /* !_SYS_QUEUE_H_ */

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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [sys/] [queue.h] - Blame information for rev 773

Line No.	Rev	Author	Line
1	30	unneback	`/*`
2			`* Copyright (c) 1991, 1993`
3			`* The Regents of the University of California. All rights reserved.`
4			`*`
5			`* Redistribution and use in source and binary forms, with or without`
6			`* modification, are permitted provided that the following conditions`
7			`* are met:`
8			`* 1. Redistributions of source code must retain the above copyright`
9			`* notice, this list of conditions and the following disclaimer.`
10			`* 2. Redistributions in binary form must reproduce the above copyright`
11			`* notice, this list of conditions and the following disclaimer in the`
12			`* documentation and/or other materials provided with the distribution.`
13			`* 3. All advertising materials mentioning features or use of this software`
14			`* must display the following acknowledgement:`
15			`* This product includes software developed by the University of`
16			`* California, Berkeley and its contributors.`
17			`* 4. Neither the name of the University nor the names of its contributors`
18			`* may be used to endorse or promote products derived from this software`
19			`* without specific prior written permission.`
20			`*`
21			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22			`* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE`
23			`* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE`
24			`* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE`
25			`* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL`
26			`* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS`
27			`* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)`
28			`* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT`
29			`* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY`
30			`* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF`
31			`* SUCH DAMAGE.`
32			`*`
33			`* @(#)queue.h 8.5 (Berkeley) 8/20/94`
34			`* $Id: queue.h,v 1.2 2001-09-27 12:02:00 chris Exp $`
35			`*/`
36
37			`#ifndef _SYS_QUEUE_H_`
38			`#define _SYS_QUEUE_H_`
39
40			`/*`
41			`* This file defines five types of data structures: singly-linked lists,`
42			`* slingly-linked tail queues, lists, tail queues, and circular queues.`
43			`*`
44			`* A singly-linked list is headed by a single forward pointer. The elements`
45			`* are singly linked for minimum space and pointer manipulation overhead at`
46			`* the expense of O(n) removal for arbitrary elements. New elements can be`
47			`* added to the list after an existing element or at the head of the list.`
48			`* Elements being removed from the head of the list should use the explicit`
49			`* macro for this purpose for optimum efficiency. A singly-linked list may`
50			`* only be traversed in the forward direction. Singly-linked lists are ideal`
51			`* for applications with large datasets and few or no removals or for`
52			`* implementing a LIFO queue.`
53			`*`
54			`* A singly-linked tail queue is headed by a pair of pointers, one to the`
55			`* head of the list and the other to the tail of the list. The elements are`
56			`* singly linked for minimum space and pointer manipulation overhead at the`
57			`* expense of O(n) removal for arbitrary elements. New elements can be added`
58			`* to the list after an existing element, at the head of the list, or at the`
59			`* end of the list. Elements being removed from the head of the tail queue`
60			`* should use the explicit macro for this purpose for optimum efficiency.`
61			`* A singly-linked tail queue may only be traversed in the forward direction.`
62			`* Singly-linked tail queues are ideal for applications with large datasets`
63			`* and few or no removals or for implementing a FIFO queue.`
64			`*`
65			`* A list is headed by a single forward pointer (or an array of forward`
66			`* pointers for a hash table header). The elements are doubly linked`
67			`* so that an arbitrary element can be removed without a need to`
68			`* traverse the list. New elements can be added to the list before`
69			`* or after an existing element or at the head of the list. A list`
70			`* may only be traversed in the forward direction.`
71			`*`
72			`* A tail queue is headed by a pair of pointers, one to the head of the`
73			`* list and the other to the tail of the list. The elements are doubly`
74			`* linked so that an arbitrary element can be removed without a need to`
75			`* traverse the list. New elements can be added to the list before or`
76			`* after an existing element, at the head of the list, or at the end of`
77			`* the list. A tail queue may only be traversed in the forward direction.`
78			`*`
79			`* A circle queue is headed by a pair of pointers, one to the head of the`
80			`* list and the other to the tail of the list. The elements are doubly`
81			`* linked so that an arbitrary element can be removed without a need to`
82			`* traverse the list. New elements can be added to the list before or after`
83			`* an existing element, at the head of the list, or at the end of the list.`
84			`* A circle queue may be traversed in either direction, but has a more`
85			`* complex end of list detection.`
86			`*`
87			`* For details on the use of these macros, see the queue(3) manual page.`
88			`*/`
89
90			`/*`
91			`* Singly-linked List definitions.`
92			`*/`
93			`#define SLIST_HEAD(name, type) \`
94			`struct name { \`
95			`struct type slh_first; / first element */ \`
96			`}`
97
98			`#define SLIST_ENTRY(type) \`
99			`struct { \`
100			`struct type sle_next; / next element */ \`
101			`}`
102
103			`/*`
104			`* Singly-linked List functions.`
105			`*/`
106			`#define SLIST_INIT(head) { \`
107			`(head)->slh_first = NULL; \`
108			`}`
109
110			`#define SLIST_INSERT_AFTER(slistelm, elm, field) { \`
111			`(elm)->field.sle_next = (slistelm)->field.sle_next; \`
112			`(slistelm)->field.sle_next = (elm); \`
113			`}`
114
115			`#define SLIST_INSERT_HEAD(head, elm, field) { \`
116			`(elm)->field.sle_next = (head)->slh_first; \`
117			`(head)->slh_first = (elm); \`
118			`}`
119
120			`#define SLIST_REMOVE_HEAD(head, field) { \`
121			`(head)->slh_first = (head)->slh_first->field.sle_next; \`
122			`}`
123
124			`#define SLIST_REMOVE(head, elm, type, field) { \`
125			`if ((head)->slh_first == (elm)) { \`
126			`SLIST_REMOVE_HEAD((head), field); \`
127			`} \`
128			`else { \`
129			`struct type *curelm = (head)->slh_first; \`
130			`while( curelm->field.sle_next != (elm) ) \`
131			`curelm = curelm->field.sle_next; \`
132			`curelm->field.sle_next = \`
133			`curelm->field.sle_next->field.sle_next; \`
134			`} \`
135			`}`
136
137			`/*`
138			`* Singly-linked Tail queue definitions.`
139			`*/`
140			`#define STAILQ_HEAD(name, type) \`
141			`struct name { \`
142			`struct type stqh_first;/ first element */ \`
143			`struct type *stqh_last;/ addr of last next element */ \`
144			`}`
145
146			`#define STAILQ_ENTRY(type) \`
147			`struct { \`
148			`struct type stqe_next; / next element */ \`
149			`}`
150
151			`/*`
152			`* Singly-linked Tail queue functions.`
153			`*/`
154			`#define STAILQ_INIT(head) { \`
155			`(head)->stqh_first = NULL; \`
156			`(head)->stqh_last = &(head)->stqh_first; \`
157			`}`
158
159			`#define STAILQ_INSERT_HEAD(head, elm, field) { \`
160			`if (((elm)->field.stqe_next = (head)->stqh_first) == NULL) \`
161			`(head)->stqh_last = &(elm)->field.stqe_next; \`
162			`(head)->stqh_first = (elm); \`
163			`}`
164
165			`#define STAILQ_INSERT_TAIL(head, elm, field) { \`
166			`(elm)->field.stqe_next = NULL; \`
167			`*(head)->stqh_last = (elm); \`
168			`(head)->stqh_last = &(elm)->field.stqe_next; \`
169			`}`
170
171			`#define STAILQ_INSERT_AFTER(head, tqelm, elm, field) { \`
172			`if (((elm)->field.stqe_next = (tqelm)->field.stqe_next) == NULL)\`
173			`(head)->stqh_last = &(elm)->field.stqe_next; \`
174			`(tqelm)->field.stqe_next = (elm); \`
175			`}`
176
177			`#define STAILQ_REMOVE_HEAD(head, field) { \`
178			`if (((head)->stqh_first = \`
179			`(head)->stqh_first->field.stqe_next) == NULL) \`
180			`(head)->stqh_last = &(head)->stqh_first; \`
181			`}`
182
183			`#define STAILQ_REMOVE(head, elm, type, field) { \`
184			`if ((head)->stqh_first == (elm)) { \`
185			`STAILQ_REMOVE_HEAD(head, field); \`
186			`} \`
187			`else { \`
188			`struct type *curelm = (head)->stqh_first; \`
189			`while( curelm->field.stqe_next != (elm) ) \`
190			`curelm = curelm->field.stqe_next; \`
191			`if((curelm->field.stqe_next = \`
192			`curelm->field.stqe_next->field.stqe_next) == NULL) \`
193			`(head)->stqh_last = &(curelm)->field.stqe_next; \`
194			`} \`
195			`}`
196
197			`/*`
198			`* List definitions.`
199			`*/`
200			`#define LIST_HEAD(name, type) \`
201			`struct name { \`
202			`struct type lh_first; / first element */ \`
203			`}`
204
205			`#define LIST_ENTRY(type) \`
206			`struct { \`
207			`struct type le_next; / next element */ \`
208			`struct type *le_prev; / address of previous next element */ \`
209			`}`
210
211			`/*`
212			`* List functions.`
213			`*/`
214			`#define LIST_INIT(head) { \`
215			`(head)->lh_first = NULL; \`
216			`}`
217
218			`#define LIST_INSERT_AFTER(listelm, elm, field) { \`
219			`if (((elm)->field.le_next = (listelm)->field.le_next) != NULL) \`
220			`(listelm)->field.le_next->field.le_prev = \`
221			`&(elm)->field.le_next; \`
222			`(listelm)->field.le_next = (elm); \`
223			`(elm)->field.le_prev = &(listelm)->field.le_next; \`
224			`}`
225
226			`#define LIST_INSERT_BEFORE(listelm, elm, field) { \`
227			`(elm)->field.le_prev = (listelm)->field.le_prev; \`
228			`(elm)->field.le_next = (listelm); \`
229			`*(listelm)->field.le_prev = (elm); \`
230			`(listelm)->field.le_prev = &(elm)->field.le_next; \`
231			`}`
232
233			`#define LIST_INSERT_HEAD(head, elm, field) { \`
234			`if (((elm)->field.le_next = (head)->lh_first) != NULL) \`
235			`(head)->lh_first->field.le_prev = &(elm)->field.le_next;\`
236			`(head)->lh_first = (elm); \`
237			`(elm)->field.le_prev = &(head)->lh_first; \`
238			`}`
239
240			`#define LIST_REMOVE(elm, field) { \`
241			`if ((elm)->field.le_next != NULL) \`
242			`(elm)->field.le_next->field.le_prev = \`
243			`(elm)->field.le_prev; \`
244			`*(elm)->field.le_prev = (elm)->field.le_next; \`
245			`}`
246
247			`/*`
248			`* Tail queue definitions.`
249			`*/`
250			`#define TAILQ_HEAD(name, type) \`
251			`struct name { \`
252			`struct type tqh_first; / first element */ \`
253			`struct type *tqh_last; / addr of last next element */ \`
254			`}`
255
256			`#define TAILQ_HEAD_INITIALIZER(head) \`
257			`{ NULL, &(head).tqh_first }`
258
259			`#define TAILQ_ENTRY(type) \`
260			`struct { \`
261			`struct type tqe_next; / next element */ \`
262			`struct type *tqe_prev; / address of previous next element */ \`
263			`}`
264
265			`/*`
266			`* Tail queue functions.`
267			`*/`
268			`#define TAILQ_EMPTY(head) ((head)->tqh_first == NULL)`
269
270			`#define TAILQ_FIRST(head) ((head)->tqh_first)`
271
272			`#define TAILQ_LAST(head) ((head)->tqh_last)`
273
274			`#define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)`
275
276			`#define TAILQ_PREV(elm, field) ((elm)->field.tqe_prev)`
277
278			`#define TAILQ_INIT(head) { \`
279			`(head)->tqh_first = NULL; \`
280			`(head)->tqh_last = &(head)->tqh_first; \`
281			`}`
282
283			`#define TAILQ_INSERT_HEAD(head, elm, field) { \`
284			`if (((elm)->field.tqe_next = (head)->tqh_first) != NULL) \`
285			`(head)->tqh_first->field.tqe_prev = \`
286			`&(elm)->field.tqe_next; \`
287			`else \`
288			`(head)->tqh_last = &(elm)->field.tqe_next; \`
289			`(head)->tqh_first = (elm); \`
290			`(elm)->field.tqe_prev = &(head)->tqh_first; \`
291			`}`
292
293			`#define TAILQ_INSERT_TAIL(head, elm, field) { \`
294			`(elm)->field.tqe_next = NULL; \`
295			`(elm)->field.tqe_prev = (head)->tqh_last; \`
296			`*(head)->tqh_last = (elm); \`
297			`(head)->tqh_last = &(elm)->field.tqe_next; \`
298			`}`
299
300			`#define TAILQ_INSERT_AFTER(head, listelm, elm, field) { \`
301			`if (((elm)->field.tqe_next = (listelm)->field.tqe_next) != NULL)\`
302			`(elm)->field.tqe_next->field.tqe_prev = \`
303			`&(elm)->field.tqe_next; \`
304			`else \`
305			`(head)->tqh_last = &(elm)->field.tqe_next; \`
306			`(listelm)->field.tqe_next = (elm); \`
307			`(elm)->field.tqe_prev = &(listelm)->field.tqe_next; \`
308			`}`
309
310			`#define TAILQ_INSERT_BEFORE(listelm, elm, field) { \`
311			`(elm)->field.tqe_prev = (listelm)->field.tqe_prev; \`
312			`(elm)->field.tqe_next = (listelm); \`
313			`*(listelm)->field.tqe_prev = (elm); \`
314			`(listelm)->field.tqe_prev = &(elm)->field.tqe_next; \`
315			`}`
316
317			`#define TAILQ_REMOVE(head, elm, field) { \`
318			`if (((elm)->field.tqe_next) != NULL) \`
319			`(elm)->field.tqe_next->field.tqe_prev = \`
320			`(elm)->field.tqe_prev; \`
321			`else \`
322			`(head)->tqh_last = (elm)->field.tqe_prev; \`
323			`*(elm)->field.tqe_prev = (elm)->field.tqe_next; \`
324			`}`
325
326			`/*`
327			`* Circular queue definitions.`
328			`*/`
329			`#define CIRCLEQ_HEAD(name, type) \`
330			`struct name { \`
331			`struct type cqh_first; / first element */ \`
332			`struct type cqh_last; / last element */ \`
333			`}`
334
335			`#define CIRCLEQ_ENTRY(type) \`
336			`struct { \`
337			`struct type cqe_next; / next element */ \`
338			`struct type cqe_prev; / previous element */ \`
339			`}`
340
341			`/*`
342			`* Circular queue functions.`
343			`*/`
344			`#define CIRCLEQ_INIT(head) { \`
345			`(head)->cqh_first = (void *)(head); \`
346			`(head)->cqh_last = (void *)(head); \`
347			`}`
348
349			`#define CIRCLEQ_INSERT_AFTER(head, listelm, elm, field) { \`
350			`(elm)->field.cqe_next = (listelm)->field.cqe_next; \`
351			`(elm)->field.cqe_prev = (listelm); \`
352			`if ((listelm)->field.cqe_next == (void *)(head)) \`
353			`(head)->cqh_last = (elm); \`
354			`else \`
355			`(listelm)->field.cqe_next->field.cqe_prev = (elm); \`
356			`(listelm)->field.cqe_next = (elm); \`
357			`}`
358
359			`#define CIRCLEQ_INSERT_BEFORE(head, listelm, elm, field) { \`
360			`(elm)->field.cqe_next = (listelm); \`
361			`(elm)->field.cqe_prev = (listelm)->field.cqe_prev; \`
362			`if ((listelm)->field.cqe_prev == (void *)(head)) \`
363			`(head)->cqh_first = (elm); \`
364			`else \`
365			`(listelm)->field.cqe_prev->field.cqe_next = (elm); \`
366			`(listelm)->field.cqe_prev = (elm); \`
367			`}`
368
369			`#define CIRCLEQ_INSERT_HEAD(head, elm, field) { \`
370			`(elm)->field.cqe_next = (head)->cqh_first; \`
371			`(elm)->field.cqe_prev = (void *)(head); \`
372			`if ((head)->cqh_last == (void *)(head)) \`
373			`(head)->cqh_last = (elm); \`
374			`else \`
375			`(head)->cqh_first->field.cqe_prev = (elm); \`
376			`(head)->cqh_first = (elm); \`
377			`}`
378
379			`#define CIRCLEQ_INSERT_TAIL(head, elm, field) { \`
380			`(elm)->field.cqe_next = (void *)(head); \`
381			`(elm)->field.cqe_prev = (head)->cqh_last; \`
382			`if ((head)->cqh_first == (void *)(head)) \`
383			`(head)->cqh_first = (elm); \`
384			`else \`
385			`(head)->cqh_last->field.cqe_next = (elm); \`
386			`(head)->cqh_last = (elm); \`
387			`}`
388
389			`#define CIRCLEQ_REMOVE(head, elm, field) { \`
390			`if ((elm)->field.cqe_next == (void *)(head)) \`
391			`(head)->cqh_last = (elm)->field.cqe_prev; \`
392			`else \`
393			`(elm)->field.cqe_next->field.cqe_prev = \`
394			`(elm)->field.cqe_prev; \`
395			`if ((elm)->field.cqe_prev == (void *)(head)) \`
396			`(head)->cqh_first = (elm)->field.cqe_next; \`
397			`else \`
398			`(elm)->field.cqe_prev->field.cqe_next = \`
399			`(elm)->field.cqe_next; \`
400			`}`
401
402			`#ifdef KERNEL`
403
404			`/*`
405			`* XXX insque() and remque() are an old way of handling certain queues.`
406			`* They bogusly assumes that all queue heads look alike.`
407			`*/`
408
409			`struct quehead {`
410			`struct quehead *qh_link;`
411			`struct quehead *qh_rlink;`
412			`};`
413
414			`#ifdef __GNUC__`
415
416			`static __inline void`
417			`insque(void a, void b)`
418			`{`
419			`struct quehead element = a, head = b;`
420
421			`element->qh_link = head->qh_link;`
422			`element->qh_rlink = head;`
423			`head->qh_link = element;`
424			`element->qh_link->qh_rlink = element;`
425			`}`
426
427			`static __inline void`
428			`remque(void *a)`
429			`{`
430			`struct quehead *element = a;`
431
432			`element->qh_link->qh_rlink = element->qh_rlink;`
433			`element->qh_rlink->qh_link = element->qh_link;`
434			`element->qh_rlink = 0;`
435			`}`
436
437			`#else /* !__GNUC__ */`
438
439			`void insque __P((void a, void b));`
440			`void remque __P((void *a));`
441
442			`#endif /* __GNUC__ */`
443
444			`#endif /* KERNEL */`
445
446			`#endif /* !_SYS_QUEUE_H_ */`