1 /* $NetBSD: heimqueue.h,v 1.1.1.2 2011/04/14 14:08:07 elric Exp $ */
3 /* NetBSD: queue.h,v 1.38 2004/04/18 14:12:05 lukem Exp */
7 * Copyright (c) 1991, 1993
8 * The Regents of the University of California. All rights reserved.
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11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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34 * @(#)queue.h 8.5 (Berkeley) 8/20/94
37 #ifndef _HEIM_QUEUE_H_
38 #define _HEIM_QUEUE_H_
41 * Tail queue definitions.
43 #define HEIM_TAILQ_HEAD(name, type) \
45 struct type *tqh_first; /* first element */ \
46 struct type **tqh_last; /* addr of last next element */ \
49 #define HEIM_TAILQ_HEAD_INITIALIZER(head) \
50 { NULL, &(head).tqh_first }
51 #define HEIM_TAILQ_ENTRY(type) \
53 struct type *tqe_next; /* next element */ \
54 struct type **tqe_prev; /* address of previous next element */ \
58 * Tail queue functions.
60 #if defined(_KERNEL) && defined(QUEUEDEBUG)
61 #define QUEUEDEBUG_HEIM_TAILQ_INSERT_HEAD(head, elm, field) \
62 if ((head)->tqh_first && \
63 (head)->tqh_first->field.tqe_prev != &(head)->tqh_first) \
64 panic("HEIM_TAILQ_INSERT_HEAD %p %s:%d", (head), __FILE__, __LINE__);
65 #define QUEUEDEBUG_HEIM_TAILQ_INSERT_TAIL(head, elm, field) \
66 if (*(head)->tqh_last != NULL) \
67 panic("HEIM_TAILQ_INSERT_TAIL %p %s:%d", (head), __FILE__, __LINE__);
68 #define QUEUEDEBUG_HEIM_TAILQ_OP(elm, field) \
69 if ((elm)->field.tqe_next && \
70 (elm)->field.tqe_next->field.tqe_prev != \
71 &(elm)->field.tqe_next) \
72 panic("HEIM_TAILQ_* forw %p %s:%d", (elm), __FILE__, __LINE__);\
73 if (*(elm)->field.tqe_prev != (elm)) \
74 panic("HEIM_TAILQ_* back %p %s:%d", (elm), __FILE__, __LINE__);
75 #define QUEUEDEBUG_HEIM_TAILQ_PREREMOVE(head, elm, field) \
76 if ((elm)->field.tqe_next == NULL && \
77 (head)->tqh_last != &(elm)->field.tqe_next) \
78 panic("HEIM_TAILQ_PREREMOVE head %p elm %p %s:%d", \
79 (head), (elm), __FILE__, __LINE__);
80 #define QUEUEDEBUG_HEIM_TAILQ_POSTREMOVE(elm, field) \
81 (elm)->field.tqe_next = (void *)1L; \
82 (elm)->field.tqe_prev = (void *)1L;
84 #define QUEUEDEBUG_HEIM_TAILQ_INSERT_HEAD(head, elm, field)
85 #define QUEUEDEBUG_HEIM_TAILQ_INSERT_TAIL(head, elm, field)
86 #define QUEUEDEBUG_HEIM_TAILQ_OP(elm, field)
87 #define QUEUEDEBUG_HEIM_TAILQ_PREREMOVE(head, elm, field)
88 #define QUEUEDEBUG_HEIM_TAILQ_POSTREMOVE(elm, field)
91 #define HEIM_TAILQ_INIT(head) do { \
92 (head)->tqh_first = NULL; \
93 (head)->tqh_last = &(head)->tqh_first; \
94 } while (/*CONSTCOND*/0)
96 #define HEIM_TAILQ_INSERT_HEAD(head, elm, field) do { \
97 QUEUEDEBUG_HEIM_TAILQ_INSERT_HEAD((head), (elm), field) \
98 if (((elm)->field.tqe_next = (head)->tqh_first) != NULL) \
99 (head)->tqh_first->field.tqe_prev = \
100 &(elm)->field.tqe_next; \
102 (head)->tqh_last = &(elm)->field.tqe_next; \
103 (head)->tqh_first = (elm); \
104 (elm)->field.tqe_prev = &(head)->tqh_first; \
105 } while (/*CONSTCOND*/0)
107 #define HEIM_TAILQ_INSERT_TAIL(head, elm, field) do { \
108 QUEUEDEBUG_HEIM_TAILQ_INSERT_TAIL((head), (elm), field) \
109 (elm)->field.tqe_next = NULL; \
110 (elm)->field.tqe_prev = (head)->tqh_last; \
111 *(head)->tqh_last = (elm); \
112 (head)->tqh_last = &(elm)->field.tqe_next; \
113 } while (/*CONSTCOND*/0)
115 #define HEIM_TAILQ_INSERT_AFTER(head, listelm, elm, field) do { \
116 QUEUEDEBUG_HEIM_TAILQ_OP((listelm), field) \
117 if (((elm)->field.tqe_next = (listelm)->field.tqe_next) != NULL)\
118 (elm)->field.tqe_next->field.tqe_prev = \
119 &(elm)->field.tqe_next; \
121 (head)->tqh_last = &(elm)->field.tqe_next; \
122 (listelm)->field.tqe_next = (elm); \
123 (elm)->field.tqe_prev = &(listelm)->field.tqe_next; \
124 } while (/*CONSTCOND*/0)
126 #define HEIM_TAILQ_INSERT_BEFORE(listelm, elm, field) do { \
127 QUEUEDEBUG_HEIM_TAILQ_OP((listelm), field) \
128 (elm)->field.tqe_prev = (listelm)->field.tqe_prev; \
129 (elm)->field.tqe_next = (listelm); \
130 *(listelm)->field.tqe_prev = (elm); \
131 (listelm)->field.tqe_prev = &(elm)->field.tqe_next; \
132 } while (/*CONSTCOND*/0)
134 #define HEIM_TAILQ_REMOVE(head, elm, field) do { \
135 QUEUEDEBUG_HEIM_TAILQ_PREREMOVE((head), (elm), field) \
136 QUEUEDEBUG_HEIM_TAILQ_OP((elm), field) \
137 if (((elm)->field.tqe_next) != NULL) \
138 (elm)->field.tqe_next->field.tqe_prev = \
139 (elm)->field.tqe_prev; \
141 (head)->tqh_last = (elm)->field.tqe_prev; \
142 *(elm)->field.tqe_prev = (elm)->field.tqe_next; \
143 QUEUEDEBUG_HEIM_TAILQ_POSTREMOVE((elm), field); \
144 } while (/*CONSTCOND*/0)
146 #define HEIM_TAILQ_FOREACH(var, head, field) \
147 for ((var) = ((head)->tqh_first); \
149 (var) = ((var)->field.tqe_next))
151 #define HEIM_TAILQ_FOREACH_REVERSE(var, head, headname, field) \
152 for ((var) = (*(((struct headname *)((head)->tqh_last))->tqh_last)); \
154 (var) = (*(((struct headname *)((var)->field.tqe_prev))->tqh_last)))
157 * Tail queue access methods.
159 #define HEIM_TAILQ_EMPTY(head) ((head)->tqh_first == NULL)
160 #define HEIM_TAILQ_FIRST(head) ((head)->tqh_first)
161 #define HEIM_TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
163 #define HEIM_TAILQ_LAST(head, headname) \
164 (*(((struct headname *)((head)->tqh_last))->tqh_last))
165 #define HEIM_TAILQ_PREV(elm, headname, field) \
166 (*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
169 #endif /* !_HEIM_QUEUE_H_ */