diff options
Diffstat (limited to 'base/heimqueue.h')
| -rw-r--r-- | base/heimqueue.h | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/base/heimqueue.h b/base/heimqueue.h new file mode 100644 index 000000000000..423a68478792 --- /dev/null +++ b/base/heimqueue.h @@ -0,0 +1,167 @@ +/* $NetBSD: queue.h,v 1.38 2004/04/18 14:12:05 lukem Exp $ */ +/* $Id$ */ + +/* + * 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 _HEIM_QUEUE_H_ +#define _HEIM_QUEUE_H_ + +/* + * Tail queue definitions. + */ +#define HEIM_TAILQ_HEAD(name, type) \ +struct name { \ + struct type *tqh_first; /* first element */ \ + struct type **tqh_last; /* addr of last next element */ \ +} + +#define HEIM_TAILQ_HEAD_INITIALIZER(head) \ + { NULL, &(head).tqh_first } +#define HEIM_TAILQ_ENTRY(type) \ +struct { \ + struct type *tqe_next; /* next element */ \ + struct type **tqe_prev; /* address of previous next element */ \ +} + +/* + * Tail queue functions. + */ +#if defined(_KERNEL) && defined(QUEUEDEBUG) +#define QUEUEDEBUG_HEIM_TAILQ_INSERT_HEAD(head, elm, field) \ + if ((head)->tqh_first && \ + (head)->tqh_first->field.tqe_prev != &(head)->tqh_first) \ + panic("HEIM_TAILQ_INSERT_HEAD %p %s:%d", (head), __FILE__, __LINE__); +#define QUEUEDEBUG_HEIM_TAILQ_INSERT_TAIL(head, elm, field) \ + if (*(head)->tqh_last != NULL) \ + panic("HEIM_TAILQ_INSERT_TAIL %p %s:%d", (head), __FILE__, __LINE__); +#define QUEUEDEBUG_HEIM_TAILQ_OP(elm, field) \ + if ((elm)->field.tqe_next && \ + (elm)->field.tqe_next->field.tqe_prev != \ + &(elm)->field.tqe_next) \ + panic("HEIM_TAILQ_* forw %p %s:%d", (elm), __FILE__, __LINE__);\ + if (*(elm)->field.tqe_prev != (elm)) \ + panic("HEIM_TAILQ_* back %p %s:%d", (elm), __FILE__, __LINE__); +#define QUEUEDEBUG_HEIM_TAILQ_PREREMOVE(head, elm, field) \ + if ((elm)->field.tqe_next == NULL && \ + (head)->tqh_last != &(elm)->field.tqe_next) \ + panic("HEIM_TAILQ_PREREMOVE head %p elm %p %s:%d", \ + (head), (elm), __FILE__, __LINE__); +#define QUEUEDEBUG_HEIM_TAILQ_POSTREMOVE(elm, field) \ + (elm)->field.tqe_next = (void *)1L; \ + (elm)->field.tqe_prev = (void *)1L; +#else +#define QUEUEDEBUG_HEIM_TAILQ_INSERT_HEAD(head, elm, field) +#define QUEUEDEBUG_HEIM_TAILQ_INSERT_TAIL(head, elm, field) +#define QUEUEDEBUG_HEIM_TAILQ_OP(elm, field) +#define QUEUEDEBUG_HEIM_TAILQ_PREREMOVE(head, elm, field) +#define QUEUEDEBUG_HEIM_TAILQ_POSTREMOVE(elm, field) +#endif + +#define HEIM_TAILQ_INIT(head) do { \ + (head)->tqh_first = NULL; \ + (head)->tqh_last = &(head)->tqh_first; \ +} while (/*CONSTCOND*/0) + +#define HEIM_TAILQ_INSERT_HEAD(head, elm, field) do { \ + QUEUEDEBUG_HEIM_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; \ +} while (/*CONSTCOND*/0) + +#define HEIM_TAILQ_INSERT_TAIL(head, elm, field) do { \ + QUEUEDEBUG_HEIM_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; \ +} while (/*CONSTCOND*/0) + +#define HEIM_TAILQ_INSERT_AFTER(head, listelm, elm, field) do { \ + QUEUEDEBUG_HEIM_TAILQ_OP((listelm), 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; \ +} while (/*CONSTCOND*/0) + +#define HEIM_TAILQ_INSERT_BEFORE(listelm, elm, field) do { \ + QUEUEDEBUG_HEIM_TAILQ_OP((listelm), 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; \ +} while (/*CONSTCOND*/0) + +#define HEIM_TAILQ_REMOVE(head, elm, field) do { \ + QUEUEDEBUG_HEIM_TAILQ_PREREMOVE((head), (elm), field) \ + QUEUEDEBUG_HEIM_TAILQ_OP((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; \ + QUEUEDEBUG_HEIM_TAILQ_POSTREMOVE((elm), field); \ +} while (/*CONSTCOND*/0) + +#define HEIM_TAILQ_FOREACH(var, head, field) \ + for ((var) = ((head)->tqh_first); \ + (var); \ + (var) = ((var)->field.tqe_next)) + +#define HEIM_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 HEIM_TAILQ_EMPTY(head) ((head)->tqh_first == NULL) +#define HEIM_TAILQ_FIRST(head) ((head)->tqh_first) +#define HEIM_TAILQ_NEXT(elm, field) ((elm)->field.tqe_next) + +#define HEIM_TAILQ_LAST(head, headname) \ + (*(((struct headname *)((head)->tqh_last))->tqh_last)) +#define HEIM_TAILQ_PREV(elm, headname, field) \ + (*(((struct headname *)((elm)->field.tqe_prev))->tqh_last)) + + +#endif /* !_HEIM_QUEUE_H_ */ |