commit d6eddfd0e3f514612f1e3c98791acaedec32056b
parent 73344fb55b0e8ca34fadd494546c76241b715b39
Author: Naveen Narayanan <zerous@nocebo.space>
Date: Sun, 26 Sep 2021 19:01:13 +0200
Add queue.h from NetBSD
Diffstat:
| A | queue.h | | | 655 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
1 file changed, 655 insertions(+), 0 deletions(-)
diff --git a/queue.h b/queue.h
@@ -0,0 +1,655 @@
+/* $NetBSD: queue.h,v 1.76 2021/01/16 23:51:51 chs Exp $ */
+
+/*
+ * 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 _SYS_QUEUE_H_
+#define _SYS_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.
+ *
+ * For details on the use of these macros, see the queue(3) manual page.
+ */
+
+/*
+ * Include the definition of NULL only on NetBSD because sys/null.h
+ * is not available elsewhere. This conditional makes the header
+ * portable and it can simply be dropped verbatim into any system.
+ * The caveat is that on other systems some other header
+ * must provide NULL before the macros can be used.
+ */
+#ifdef __NetBSD__
+#include <sys/null.h>
+#endif
+
+#if defined(_KERNEL) && defined(DIAGNOSTIC)
+#define QUEUEDEBUG 1
+#endif
+
+#if defined(QUEUEDEBUG)
+# if defined(_KERNEL)
+# define QUEUEDEBUG_ABORT(...) panic(__VA_ARGS__)
+# else
+# include <err.h>
+# define QUEUEDEBUG_ABORT(...) err(1, __VA_ARGS__)
+# endif
+#endif
+
+/*
+ * 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 access methods.
+ */
+#define SLIST_FIRST(head) ((head)->slh_first)
+#define SLIST_END(head) NULL
+#define SLIST_EMPTY(head) ((head)->slh_first == NULL)
+#define SLIST_NEXT(elm, field) ((elm)->field.sle_next)
+
+#define SLIST_FOREACH(var, head, field) \
+ for((var) = (head)->slh_first; \
+ (var) != SLIST_END(head); \
+ (var) = (var)->field.sle_next)
+
+#define SLIST_FOREACH_SAFE(var, head, field, tvar) \
+ for ((var) = SLIST_FIRST((head)); \
+ (var) != SLIST_END(head) && \
+ ((tvar) = SLIST_NEXT((var), field), 1); \
+ (var) = (tvar))
+
+/*
+ * Singly-linked List functions.
+ */
+#define SLIST_INIT(head) do { \
+ (head)->slh_first = SLIST_END(head); \
+} 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_AFTER(slistelm, field) do { \
+ (slistelm)->field.sle_next = \
+ SLIST_NEXT(SLIST_NEXT((slistelm), field), field); \
+} 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)
+
+
+/*
+ * 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 access methods.
+ */
+#define LIST_FIRST(head) ((head)->lh_first)
+#define LIST_END(head) NULL
+#define LIST_EMPTY(head) ((head)->lh_first == LIST_END(head))
+#define LIST_NEXT(elm, field) ((elm)->field.le_next)
+
+#define LIST_FOREACH(var, head, field) \
+ for ((var) = ((head)->lh_first); \
+ (var) != LIST_END(head); \
+ (var) = ((var)->field.le_next))
+
+#define LIST_FOREACH_SAFE(var, head, field, tvar) \
+ for ((var) = LIST_FIRST((head)); \
+ (var) != LIST_END(head) && \
+ ((tvar) = LIST_NEXT((var), field), 1); \
+ (var) = (tvar))
+
+#define LIST_MOVE(head1, head2, field) do { \
+ LIST_INIT((head2)); \
+ if (!LIST_EMPTY((head1))) { \
+ (head2)->lh_first = (head1)->lh_first; \
+ (head2)->lh_first->field.le_prev = &(head2)->lh_first; \
+ LIST_INIT((head1)); \
+ } \
+} while (/*CONSTCOND*/0)
+
+/*
+ * List functions.
+ */
+#if defined(QUEUEDEBUG)
+#define QUEUEDEBUG_LIST_INSERT_HEAD(head, elm, field) \
+ if ((head)->lh_first && \
+ (head)->lh_first->field.le_prev != &(head)->lh_first) \
+ QUEUEDEBUG_ABORT("LIST_INSERT_HEAD %p %s:%d", (head), \
+ __FILE__, __LINE__);
+#define QUEUEDEBUG_LIST_OP(elm, field) \
+ if ((elm)->field.le_next && \
+ (elm)->field.le_next->field.le_prev != \
+ &(elm)->field.le_next) \
+ QUEUEDEBUG_ABORT("LIST_* forw %p %s:%d", (elm), \
+ __FILE__, __LINE__); \
+ if (*(elm)->field.le_prev != (elm)) \
+ QUEUEDEBUG_ABORT("LIST_* back %p %s:%d", (elm), \
+ __FILE__, __LINE__);
+#define QUEUEDEBUG_LIST_POSTREMOVE(elm, field) \
+ (elm)->field.le_next = (void *)1L; \
+ (elm)->field.le_prev = (void *)1L;
+#else
+#define QUEUEDEBUG_LIST_INSERT_HEAD(head, elm, field)
+#define QUEUEDEBUG_LIST_OP(elm, field)
+#define QUEUEDEBUG_LIST_POSTREMOVE(elm, field)
+#endif
+
+#define LIST_INIT(head) do { \
+ (head)->lh_first = LIST_END(head); \
+} while (/*CONSTCOND*/0)
+
+#define LIST_INSERT_AFTER(listelm, elm, field) do { \
+ QUEUEDEBUG_LIST_OP((listelm), field) \
+ if (((elm)->field.le_next = (listelm)->field.le_next) != \
+ LIST_END(head)) \
+ (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 { \
+ QUEUEDEBUG_LIST_OP((listelm), 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; \
+} while (/*CONSTCOND*/0)
+
+#define LIST_INSERT_HEAD(head, elm, field) do { \
+ QUEUEDEBUG_LIST_INSERT_HEAD((head), (elm), field) \
+ if (((elm)->field.le_next = (head)->lh_first) != LIST_END(head))\
+ (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 { \
+ QUEUEDEBUG_LIST_OP((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; \
+ QUEUEDEBUG_LIST_POSTREMOVE((elm), field) \
+} while (/*CONSTCOND*/0)
+
+#define LIST_REPLACE(elm, elm2, field) do { \
+ if (((elm2)->field.le_next = (elm)->field.le_next) != NULL) \
+ (elm2)->field.le_next->field.le_prev = \
+ &(elm2)->field.le_next; \
+ (elm2)->field.le_prev = (elm)->field.le_prev; \
+ *(elm2)->field.le_prev = (elm2); \
+ QUEUEDEBUG_LIST_POSTREMOVE((elm), field) \
+} while (/*CONSTCOND*/0)
+
+/*
+ * 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 access methods.
+ */
+#define SIMPLEQ_FIRST(head) ((head)->sqh_first)
+#define SIMPLEQ_END(head) NULL
+#define SIMPLEQ_EMPTY(head) ((head)->sqh_first == SIMPLEQ_END(head))
+#define SIMPLEQ_NEXT(elm, field) ((elm)->field.sqe_next)
+
+#define SIMPLEQ_FOREACH(var, head, field) \
+ for ((var) = ((head)->sqh_first); \
+ (var) != SIMPLEQ_END(head); \
+ (var) = ((var)->field.sqe_next))
+
+#define SIMPLEQ_FOREACH_SAFE(var, head, field, next) \
+ for ((var) = ((head)->sqh_first); \
+ (var) != SIMPLEQ_END(head) && \
+ ((next = ((var)->field.sqe_next)), 1); \
+ (var) = (next))
+
+/*
+ * 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_AFTER(head, elm, field) do { \
+ if (((elm)->field.sqe_next = (elm)->field.sqe_next->field.sqe_next) \
+ == NULL) \
+ (head)->sqh_last = &(elm)->field.sqe_next; \
+} 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_CONCAT(head1, head2) do { \
+ if (!SIMPLEQ_EMPTY((head2))) { \
+ *(head1)->sqh_last = (head2)->sqh_first; \
+ (head1)->sqh_last = (head2)->sqh_last; \
+ SIMPLEQ_INIT((head2)); \
+ } \
+} while (/*CONSTCOND*/0)
+
+#define SIMPLEQ_LAST(head, type, field) \
+ (SIMPLEQ_EMPTY((head)) ? \
+ NULL : \
+ ((struct type *)(void *) \
+ ((char *)((head)->sqh_last) - offsetof(struct type, field))))
+
+/*
+ * 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) \
+ { TAILQ_END(head), &(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 access methods.
+ */
+#define TAILQ_FIRST(head) ((head)->tqh_first)
+#define TAILQ_END(head) (NULL)
+#define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
+#define TAILQ_LAST(head, headname) \
+ (*(((struct headname *)(void *)((head)->tqh_last))->tqh_last))
+#define TAILQ_PREV(elm, headname, field) \
+ (*(((struct headname *)(void *)((elm)->field.tqe_prev))->tqh_last))
+#define TAILQ_EMPTY(head) (TAILQ_FIRST(head) == TAILQ_END(head))
+
+
+#define TAILQ_FOREACH(var, head, field) \
+ for ((var) = ((head)->tqh_first); \
+ (var) != TAILQ_END(head); \
+ (var) = ((var)->field.tqe_next))
+
+#define TAILQ_FOREACH_SAFE(var, head, field, next) \
+ for ((var) = ((head)->tqh_first); \
+ (var) != TAILQ_END(head) && \
+ ((next) = TAILQ_NEXT(var, field), 1); (var) = (next))
+
+#define TAILQ_FOREACH_REVERSE(var, head, headname, field) \
+ for ((var) = TAILQ_LAST((head), headname); \
+ (var) != TAILQ_END(head); \
+ (var) = TAILQ_PREV((var), headname, field))
+
+#define TAILQ_FOREACH_REVERSE_SAFE(var, head, headname, field, prev) \
+ for ((var) = TAILQ_LAST((head), headname); \
+ (var) != TAILQ_END(head) && \
+ ((prev) = TAILQ_PREV((var), headname, field), 1); (var) = (prev))
+
+/*
+ * Tail queue functions.
+ */
+#if defined(QUEUEDEBUG)
+#define QUEUEDEBUG_TAILQ_INSERT_HEAD(head, elm, field) \
+ if ((head)->tqh_first && \
+ (head)->tqh_first->field.tqe_prev != &(head)->tqh_first) \
+ QUEUEDEBUG_ABORT("TAILQ_INSERT_HEAD %p %s:%d", (head), \
+ __FILE__, __LINE__);
+#define QUEUEDEBUG_TAILQ_INSERT_TAIL(head, elm, field) \
+ if (*(head)->tqh_last != NULL) \
+ QUEUEDEBUG_ABORT("TAILQ_INSERT_TAIL %p %s:%d", (head), \
+ __FILE__, __LINE__);
+#define QUEUEDEBUG_TAILQ_OP(elm, field) \
+ if ((elm)->field.tqe_next && \
+ (elm)->field.tqe_next->field.tqe_prev != \
+ &(elm)->field.tqe_next) \
+ QUEUEDEBUG_ABORT("TAILQ_* forw %p %s:%d", (elm), \
+ __FILE__, __LINE__); \
+ if (*(elm)->field.tqe_prev != (elm)) \
+ QUEUEDEBUG_ABORT("TAILQ_* back %p %s:%d", (elm), \
+ __FILE__, __LINE__);
+#define QUEUEDEBUG_TAILQ_PREREMOVE(head, elm, field) \
+ if ((elm)->field.tqe_next == NULL && \
+ (head)->tqh_last != &(elm)->field.tqe_next) \
+ QUEUEDEBUG_ABORT("TAILQ_PREREMOVE head %p elm %p %s:%d",\
+ (head), (elm), __FILE__, __LINE__);
+#define QUEUEDEBUG_TAILQ_POSTREMOVE(elm, field) \
+ (elm)->field.tqe_next = (void *)1L; \
+ (elm)->field.tqe_prev = (void *)1L;
+#else
+#define QUEUEDEBUG_TAILQ_INSERT_HEAD(head, elm, field)
+#define QUEUEDEBUG_TAILQ_INSERT_TAIL(head, elm, field)
+#define QUEUEDEBUG_TAILQ_OP(elm, field)
+#define QUEUEDEBUG_TAILQ_PREREMOVE(head, elm, field)
+#define QUEUEDEBUG_TAILQ_POSTREMOVE(elm, field)
+#endif
+
+#define TAILQ_INIT(head) do { \
+ (head)->tqh_first = TAILQ_END(head); \
+ (head)->tqh_last = &(head)->tqh_first; \
+} while (/*CONSTCOND*/0)
+
+#define TAILQ_INSERT_HEAD(head, elm, field) do { \
+ QUEUEDEBUG_TAILQ_INSERT_HEAD((head), (elm), field) \
+ if (((elm)->field.tqe_next = (head)->tqh_first) != TAILQ_END(head))\
+ (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 { \
+ QUEUEDEBUG_TAILQ_INSERT_TAIL((head), (elm), field) \
+ (elm)->field.tqe_next = TAILQ_END(head); \
+ (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 { \
+ QUEUEDEBUG_TAILQ_OP((listelm), field) \
+ if (((elm)->field.tqe_next = (listelm)->field.tqe_next) != \
+ TAILQ_END(head)) \
+ (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 { \
+ QUEUEDEBUG_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 TAILQ_REMOVE(head, elm, field) do { \
+ QUEUEDEBUG_TAILQ_PREREMOVE((head), (elm), field) \
+ QUEUEDEBUG_TAILQ_OP((elm), field) \
+ if (((elm)->field.tqe_next) != TAILQ_END(head)) \
+ (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_TAILQ_POSTREMOVE((elm), field); \
+} while (/*CONSTCOND*/0)
+
+#define TAILQ_REPLACE(head, elm, elm2, field) do { \
+ if (((elm2)->field.tqe_next = (elm)->field.tqe_next) != \
+ TAILQ_END(head)) \
+ (elm2)->field.tqe_next->field.tqe_prev = \
+ &(elm2)->field.tqe_next; \
+ else \
+ (head)->tqh_last = &(elm2)->field.tqe_next; \
+ (elm2)->field.tqe_prev = (elm)->field.tqe_prev; \
+ *(elm2)->field.tqe_prev = (elm2); \
+ QUEUEDEBUG_TAILQ_POSTREMOVE((elm), field); \
+} while (/*CONSTCOND*/0)
+
+#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)
+
+/*
+ * 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 access methods.
+ */
+#define STAILQ_FIRST(head) ((head)->stqh_first)
+#define STAILQ_END(head) NULL
+#define STAILQ_NEXT(elm, field) ((elm)->field.stqe_next)
+#define STAILQ_EMPTY(head) (STAILQ_FIRST(head) == STAILQ_END(head))
+
+/*
+ * 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_FOREACH_SAFE(var, head, field, tvar) \
+ for ((var) = STAILQ_FIRST((head)); \
+ (var) && ((tvar) = STAILQ_NEXT((var), field), 1); \
+ (var) = (tvar))
+
+#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)
+
+#define STAILQ_LAST(head, type, field) \
+ (STAILQ_EMPTY((head)) ? \
+ NULL : \
+ ((struct type *)(void *) \
+ ((char *)((head)->stqh_last) - offsetof(struct type, field))))
+
+#endif /* !_SYS_QUEUE_H_ */
