1 /* $NetBSD: heimqueue.h,v 1.1.1.2 2011/04/14 14:08:07 elric Exp $ */ 2 3 /* NetBSD: queue.h,v 1.38 2004/04/18 14:12:05 lukem Exp */ 4 /* Id */ 5 6 /* 7 * Copyright (c) 1991, 1993 8 * The Regents of the University of California. All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 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. 21 * 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) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)queue.h 8.5 (Berkeley) 8/20/94 35 */ 36 37 #ifndef _HEIM_QUEUE_H_ 38 #define _HEIM_QUEUE_H_ 39 40 /* 41 * Tail queue definitions. 42 */ 43 #define HEIM_TAILQ_HEAD(name, type) \ 44 struct name { \ 45 struct type *tqh_first; /* first element */ \ 46 struct type **tqh_last; /* addr of last next element */ \ 47 } 48 49 #define HEIM_TAILQ_HEAD_INITIALIZER(head) \ 50 { NULL, &(head).tqh_first } 51 #define HEIM_TAILQ_ENTRY(type) \ 52 struct { \ 53 struct type *tqe_next; /* next element */ \ 54 struct type **tqe_prev; /* address of previous next element */ \ 55 } 56 57 /* 58 * Tail queue functions. 59 */ 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; 83 #else 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) 89 #endif 90 91 #define HEIM_TAILQ_INIT(head) do { \ 92 (head)->tqh_first = NULL; \ 93 (head)->tqh_last = &(head)->tqh_first; \ 94 } while (/*CONSTCOND*/0) 95 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; \ 101 else \ 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) 106 107 #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) 114 115 #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; \ 120 else \ 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) 125 126 #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) 133 134 #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; \ 140 else \ 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) 145 146 #define HEIM_TAILQ_FOREACH(var, head, field) \ 147 for ((var) = ((head)->tqh_first); \ 148 (var); \ 149 (var) = ((var)->field.tqe_next)) 150 151 #define HEIM_TAILQ_FOREACH_REVERSE(var, head, headname, field) \ 152 for ((var) = (*(((struct headname *)((head)->tqh_last))->tqh_last)); \ 153 (var); \ 154 (var) = (*(((struct headname *)((var)->field.tqe_prev))->tqh_last))) 155 156 /* 157 * Tail queue access methods. 158 */ 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) 162 163 #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)) 167 168 169 #endif /* !_HEIM_QUEUE_H_ */ 170