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@@ -0,0 +1,574 @@
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+/*
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+ * Copyright (c) 1991, 1993
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+ * The Regents of the University of California. All rights reserved.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions
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+ * are met:
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+ * 1. Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions and the following disclaimer.
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+ * 2. Redistributions in binary form must reproduce the above copyright
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+ * notice, this list of conditions and the following disclaimer in the
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+ * documentation and/or other materials provided with the distribution.
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+ * 3. Neither the name of the University nor the names of its contributors
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+ * may be used to endorse or promote products derived from this software
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+ * without specific prior written permission.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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+ * SUCH DAMAGE.
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+ *
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+ * @(#)queue.h 8.5 (Berkeley) 8/20/94
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+ */
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+
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+#ifndef _SYS_QUEUE_H_
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+#define _SYS_QUEUE_H_
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+
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+/*
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+ * This file defines five types of data structures: singly-linked lists,
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+ * lists, simple queues, tail queues, and circular queues.
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+ *
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+ * A singly-linked list is headed by a single forward pointer. The
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+ * elements are singly linked for minimum space and pointer manipulation
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+ * overhead at the expense of O(n) removal for arbitrary elements. New
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+ * elements can be added to the list after an existing element or at the
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+ * head of the list. Elements being removed from the head of the list
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+ * should use the explicit macro for this purpose for optimum
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+ * efficiency. A singly-linked list may only be traversed in the forward
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+ * direction. Singly-linked lists are ideal for applications with large
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+ * datasets and few or no removals or for implementing a LIFO queue.
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+ *
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+ * A list is headed by a single forward pointer (or an array of forward
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+ * pointers for a hash table header). The elements are doubly linked
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+ * so that an arbitrary element can be removed without a need to
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+ * traverse the list. New elements can be added to the list before
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+ * or after an existing element or at the head of the list. A list
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+ * may only be traversed in the forward direction.
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+ *
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+ * A simple queue is headed by a pair of pointers, one the head of the
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+ * list and the other to the tail of the list. The elements are singly
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+ * linked to save space, so elements can only be removed from the
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+ * head of the list. New elements can be added to the list after
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+ * an existing element, at the head of the list, or at the end of the
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+ * list. A simple queue may only be traversed in the forward direction.
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+ *
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+ * A tail queue is headed by a pair of pointers, one to the head of the
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+ * list and the other to the tail of the list. The elements are doubly
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+ * linked so that an arbitrary element can be removed without a need to
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+ * traverse the list. New elements can be added to the list before or
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+ * after an existing element, at the head of the list, or at the end of
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+ * the list. A tail queue may be traversed in either direction.
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+ *
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+ * A circle queue is headed by a pair of pointers, one to the head of the
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+ * list and the other to the tail of the list. The elements are doubly
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+ * linked so that an arbitrary element can be removed without a need to
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+ * traverse the list. New elements can be added to the list before or after
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+ * an existing element, at the head of the list, or at the end of the list.
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+ * A circle queue may be traversed in either direction, but has a more
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+ * complex end of list detection.
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+ *
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+ * For details on the use of these macros, see the queue(3) manual page.
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+ */
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+
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+/*
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+ * List definitions.
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+ */
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+#define LIST_HEAD(name, type) \
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+struct name { \
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+ struct type *lh_first; /* first element */ \
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+}
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+
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+#define LIST_HEAD_INITIALIZER(head) \
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+ { NULL }
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+
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+#define LIST_ENTRY(type) \
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+struct { \
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+ struct type *le_next; /* next element */ \
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+ struct type **le_prev; /* address of previous next element */ \
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+}
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+
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+/*
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+ * List functions.
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+ */
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+#define LIST_INIT(head) do { \
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+ (head)->lh_first = NULL; \
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+} while (/*CONSTCOND*/0)
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+
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+#define LIST_INSERT_AFTER(listelm, elm, field) do { \
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+ if (((elm)->field.le_next = (listelm)->field.le_next) != NULL) \
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+ (listelm)->field.le_next->field.le_prev = \
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+ &(elm)->field.le_next; \
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+ (listelm)->field.le_next = (elm); \
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+ (elm)->field.le_prev = &(listelm)->field.le_next; \
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+} while (/*CONSTCOND*/0)
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+
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+#define LIST_INSERT_BEFORE(listelm, elm, field) do { \
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+ (elm)->field.le_prev = (listelm)->field.le_prev; \
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+ (elm)->field.le_next = (listelm); \
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+ *(listelm)->field.le_prev = (elm); \
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+ (listelm)->field.le_prev = &(elm)->field.le_next; \
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+} while (/*CONSTCOND*/0)
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+
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+#define LIST_INSERT_HEAD(head, elm, field) do { \
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+ if (((elm)->field.le_next = (head)->lh_first) != NULL) \
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+ (head)->lh_first->field.le_prev = &(elm)->field.le_next;\
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+ (head)->lh_first = (elm); \
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+ (elm)->field.le_prev = &(head)->lh_first; \
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+} while (/*CONSTCOND*/0)
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+
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+#define LIST_REMOVE(elm, field) do { \
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+ if ((elm)->field.le_next != NULL) \
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+ (elm)->field.le_next->field.le_prev = \
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+ (elm)->field.le_prev; \
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+ *(elm)->field.le_prev = (elm)->field.le_next; \
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+} while (/*CONSTCOND*/0)
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+
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+#define LIST_FOREACH(var, head, field) \
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+ for ((var) = ((head)->lh_first); \
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+ (var); \
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+ (var) = ((var)->field.le_next))
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+
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+/*
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+ * List access methods.
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+ */
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+#define LIST_EMPTY(head) ((head)->lh_first == NULL)
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+#define LIST_FIRST(head) ((head)->lh_first)
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+#define LIST_NEXT(elm, field) ((elm)->field.le_next)
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+
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+
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+/*
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+ * Singly-linked List definitions.
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+ */
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+#define SLIST_HEAD(name, type) \
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+struct name { \
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+ struct type *slh_first; /* first element */ \
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+}
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+
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+#define SLIST_HEAD_INITIALIZER(head) \
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+ { NULL }
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+
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+#define SLIST_ENTRY(type) \
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+struct { \
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+ struct type *sle_next; /* next element */ \
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+}
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+
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+/*
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+ * Singly-linked List functions.
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+ */
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+#define SLIST_INIT(head) do { \
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+ (head)->slh_first = NULL; \
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+} while (/*CONSTCOND*/0)
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+
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+#define SLIST_INSERT_AFTER(slistelm, elm, field) do { \
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+ (elm)->field.sle_next = (slistelm)->field.sle_next; \
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+ (slistelm)->field.sle_next = (elm); \
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+} while (/*CONSTCOND*/0)
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+
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+#define SLIST_INSERT_HEAD(head, elm, field) do { \
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+ (elm)->field.sle_next = (head)->slh_first; \
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+ (head)->slh_first = (elm); \
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+} while (/*CONSTCOND*/0)
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+
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+#define SLIST_REMOVE_HEAD(head, field) do { \
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+ (head)->slh_first = (head)->slh_first->field.sle_next; \
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+} while (/*CONSTCOND*/0)
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+
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+#define SLIST_REMOVE(head, elm, type, field) do { \
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+ if ((head)->slh_first == (elm)) { \
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+ SLIST_REMOVE_HEAD((head), field); \
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+ } \
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+ else { \
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+ struct type *curelm = (head)->slh_first; \
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+ while(curelm->field.sle_next != (elm)) \
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+ curelm = curelm->field.sle_next; \
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+ curelm->field.sle_next = \
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+ curelm->field.sle_next->field.sle_next; \
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+ } \
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+} while (/*CONSTCOND*/0)
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+
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+#define SLIST_FOREACH(var, head, field) \
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+ for((var) = (head)->slh_first; (var); (var) = (var)->field.sle_next)
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+
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+/*
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+ * Singly-linked List access methods.
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+ */
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+#define SLIST_EMPTY(head) ((head)->slh_first == NULL)
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+#define SLIST_FIRST(head) ((head)->slh_first)
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+#define SLIST_NEXT(elm, field) ((elm)->field.sle_next)
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+
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+
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+/*
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+ * Singly-linked Tail queue declarations.
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+ */
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+#define STAILQ_HEAD(name, type) \
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+struct name { \
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+ struct type *stqh_first; /* first element */ \
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+ struct type **stqh_last; /* addr of last next element */ \
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+}
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+
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+#define STAILQ_HEAD_INITIALIZER(head) \
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+ { NULL, &(head).stqh_first }
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+
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+#define STAILQ_ENTRY(type) \
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+struct { \
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+ struct type *stqe_next; /* next element */ \
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+}
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+
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+/*
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+ * Singly-linked Tail queue functions.
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+ */
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+#define STAILQ_INIT(head) do { \
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+ (head)->stqh_first = NULL; \
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+ (head)->stqh_last = &(head)->stqh_first; \
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+} while (/*CONSTCOND*/0)
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+
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+#define STAILQ_INSERT_HEAD(head, elm, field) do { \
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+ if (((elm)->field.stqe_next = (head)->stqh_first) == NULL) \
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+ (head)->stqh_last = &(elm)->field.stqe_next; \
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+ (head)->stqh_first = (elm); \
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+} while (/*CONSTCOND*/0)
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+
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+#define STAILQ_INSERT_TAIL(head, elm, field) do { \
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+ (elm)->field.stqe_next = NULL; \
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+ *(head)->stqh_last = (elm); \
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+ (head)->stqh_last = &(elm)->field.stqe_next; \
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+} while (/*CONSTCOND*/0)
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+
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+#define STAILQ_INSERT_AFTER(head, listelm, elm, field) do { \
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+ if (((elm)->field.stqe_next = (listelm)->field.stqe_next) == NULL)\
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+ (head)->stqh_last = &(elm)->field.stqe_next; \
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+ (listelm)->field.stqe_next = (elm); \
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+} while (/*CONSTCOND*/0)
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+
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+#define STAILQ_REMOVE_HEAD(head, field) do { \
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+ if (((head)->stqh_first = (head)->stqh_first->field.stqe_next) == NULL) \
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+ (head)->stqh_last = &(head)->stqh_first; \
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+} while (/*CONSTCOND*/0)
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+
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+#define STAILQ_REMOVE(head, elm, type, field) do { \
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+ if ((head)->stqh_first == (elm)) { \
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+ STAILQ_REMOVE_HEAD((head), field); \
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+ } else { \
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+ struct type *curelm = (head)->stqh_first; \
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+ while (curelm->field.stqe_next != (elm)) \
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+ curelm = curelm->field.stqe_next; \
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+ if ((curelm->field.stqe_next = \
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+ curelm->field.stqe_next->field.stqe_next) == NULL) \
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+ (head)->stqh_last = &(curelm)->field.stqe_next; \
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+ } \
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+} while (/*CONSTCOND*/0)
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+
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+#define STAILQ_FOREACH(var, head, field) \
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+ for ((var) = ((head)->stqh_first); \
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+ (var); \
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+ (var) = ((var)->field.stqe_next))
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+
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+#define STAILQ_CONCAT(head1, head2) do { \
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+ if (!STAILQ_EMPTY((head2))) { \
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+ *(head1)->stqh_last = (head2)->stqh_first; \
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+ (head1)->stqh_last = (head2)->stqh_last; \
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+ STAILQ_INIT((head2)); \
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+ } \
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+} while (/*CONSTCOND*/0)
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+
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+/*
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+ * Singly-linked Tail queue access methods.
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+ */
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+#define STAILQ_EMPTY(head) ((head)->stqh_first == NULL)
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+#define STAILQ_FIRST(head) ((head)->stqh_first)
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+#define STAILQ_NEXT(elm, field) ((elm)->field.stqe_next)
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+
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+
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+/*
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+ * Simple queue definitions.
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+ */
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+#define SIMPLEQ_HEAD(name, type) \
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+struct name { \
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+ struct type *sqh_first; /* first element */ \
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+ struct type **sqh_last; /* addr of last next element */ \
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+}
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+
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+#define SIMPLEQ_HEAD_INITIALIZER(head) \
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+ { NULL, &(head).sqh_first }
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+
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+#define SIMPLEQ_ENTRY(type) \
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+struct { \
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+ struct type *sqe_next; /* next element */ \
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+}
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+
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+/*
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+ * Simple queue functions.
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+ */
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+#define SIMPLEQ_INIT(head) do { \
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+ (head)->sqh_first = NULL; \
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+ (head)->sqh_last = &(head)->sqh_first; \
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+} while (/*CONSTCOND*/0)
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+
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+#define SIMPLEQ_INSERT_HEAD(head, elm, field) do { \
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+ if (((elm)->field.sqe_next = (head)->sqh_first) == NULL) \
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+ (head)->sqh_last = &(elm)->field.sqe_next; \
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+ (head)->sqh_first = (elm); \
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+} while (/*CONSTCOND*/0)
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+
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+#define SIMPLEQ_INSERT_TAIL(head, elm, field) do { \
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+ (elm)->field.sqe_next = NULL; \
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+ *(head)->sqh_last = (elm); \
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+ (head)->sqh_last = &(elm)->field.sqe_next; \
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+} while (/*CONSTCOND*/0)
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+
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+#define SIMPLEQ_INSERT_AFTER(head, listelm, elm, field) do { \
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+ if (((elm)->field.sqe_next = (listelm)->field.sqe_next) == NULL)\
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+ (head)->sqh_last = &(elm)->field.sqe_next; \
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+ (listelm)->field.sqe_next = (elm); \
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+} while (/*CONSTCOND*/0)
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+
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+#define SIMPLEQ_REMOVE_HEAD(head, field) do { \
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+ if (((head)->sqh_first = (head)->sqh_first->field.sqe_next) == NULL) \
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+ (head)->sqh_last = &(head)->sqh_first; \
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+} while (/*CONSTCOND*/0)
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+
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+#define SIMPLEQ_REMOVE(head, elm, type, field) do { \
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+ if ((head)->sqh_first == (elm)) { \
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+ SIMPLEQ_REMOVE_HEAD((head), field); \
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+ } else { \
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+ struct type *curelm = (head)->sqh_first; \
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+ while (curelm->field.sqe_next != (elm)) \
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+ curelm = curelm->field.sqe_next; \
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+ if ((curelm->field.sqe_next = \
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+ curelm->field.sqe_next->field.sqe_next) == NULL) \
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+ (head)->sqh_last = &(curelm)->field.sqe_next; \
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+ } \
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+} while (/*CONSTCOND*/0)
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+
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+#define SIMPLEQ_FOREACH(var, head, field) \
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+ for ((var) = ((head)->sqh_first); \
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+ (var); \
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+ (var) = ((var)->field.sqe_next))
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+
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+/*
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+ * Simple queue access methods.
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+ */
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+#define SIMPLEQ_EMPTY(head) ((head)->sqh_first == NULL)
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+#define SIMPLEQ_FIRST(head) ((head)->sqh_first)
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+#define SIMPLEQ_NEXT(elm, field) ((elm)->field.sqe_next)
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+
|
|
|
+
|
|
|
+/*
|
|
|
+ * Tail queue definitions.
|
|
|
+ */
|
|
|
+#define _TAILQ_HEAD(name, type, qual) \
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|
|
+struct name { \
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|
|
+ qual type *tqh_first; /* first element */ \
|
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|
+ qual type *qual *tqh_last; /* addr of last next element */ \
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|
|
+}
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|
+#define TAILQ_HEAD(name, type) _TAILQ_HEAD(name, struct type,)
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+
|
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+#define TAILQ_HEAD_INITIALIZER(head) \
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+ { NULL, &(head).tqh_first }
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|
+
|
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|
+#define _TAILQ_ENTRY(type, qual) \
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|
+struct { \
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|
+ qual type *tqe_next; /* next element */ \
|
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|
+ qual type *qual *tqe_prev; /* address of previous next element */\
|
|
|
+}
|
|
|
+#define TAILQ_ENTRY(type) _TAILQ_ENTRY(struct type,)
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|
+
|
|
|
+/*
|
|
|
+ * Tail queue functions.
|
|
|
+ */
|
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|
+#define TAILQ_INIT(head) do { \
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|
+ (head)->tqh_first = NULL; \
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|
+ (head)->tqh_last = &(head)->tqh_first; \
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|
+} while (/*CONSTCOND*/0)
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+
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|
+#define TAILQ_INSERT_HEAD(head, elm, field) do { \
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+ if (((elm)->field.tqe_next = (head)->tqh_first) != NULL) \
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+ (head)->tqh_first->field.tqe_prev = \
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+ &(elm)->field.tqe_next; \
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+ else \
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|
+ (head)->tqh_last = &(elm)->field.tqe_next; \
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|
+ (head)->tqh_first = (elm); \
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|
+ (elm)->field.tqe_prev = &(head)->tqh_first; \
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|
|
+} while (/*CONSTCOND*/0)
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+
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|
+#define TAILQ_INSERT_TAIL(head, elm, field) do { \
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+ (elm)->field.tqe_next = NULL; \
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|
+ (elm)->field.tqe_prev = (head)->tqh_last; \
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+ *(head)->tqh_last = (elm); \
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|
+ (head)->tqh_last = &(elm)->field.tqe_next; \
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|
+} while (/*CONSTCOND*/0)
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|
+
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|
+#define TAILQ_INSERT_AFTER(head, listelm, elm, field) do { \
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|
+ if (((elm)->field.tqe_next = (listelm)->field.tqe_next) != NULL)\
|
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|
+ (elm)->field.tqe_next->field.tqe_prev = \
|
|
|
+ &(elm)->field.tqe_next; \
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|
|
+ else \
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|
+ (head)->tqh_last = &(elm)->field.tqe_next; \
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|
+ (listelm)->field.tqe_next = (elm); \
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|
+ (elm)->field.tqe_prev = &(listelm)->field.tqe_next; \
|
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|
+} while (/*CONSTCOND*/0)
|
|
|
+
|
|
|
+#define TAILQ_INSERT_BEFORE(listelm, elm, field) do { \
|
|
|
+ (elm)->field.tqe_prev = (listelm)->field.tqe_prev; \
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|
+ (elm)->field.tqe_next = (listelm); \
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|
|
+ *(listelm)->field.tqe_prev = (elm); \
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|
|
+ (listelm)->field.tqe_prev = &(elm)->field.tqe_next; \
|
|
|
+} while (/*CONSTCOND*/0)
|
|
|
+
|
|
|
+#define TAILQ_REMOVE(head, elm, field) do { \
|
|
|
+ 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; \
|
|
|
+} while (/*CONSTCOND*/0)
|
|
|
+
|
|
|
+#define TAILQ_FOREACH(var, head, field) \
|
|
|
+ for ((var) = ((head)->tqh_first); \
|
|
|
+ (var); \
|
|
|
+ (var) = ((var)->field.tqe_next))
|
|
|
+
|
|
|
+#define 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)))
|
|
|
+
|
|
|
+#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)
|
|
|
+
|
|
|
+/*
|
|
|
+ * Tail queue access methods.
|
|
|
+ */
|
|
|
+#define TAILQ_EMPTY(head) ((head)->tqh_first == NULL)
|
|
|
+#define TAILQ_FIRST(head) ((head)->tqh_first)
|
|
|
+#define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
|
|
|
+
|
|
|
+#define TAILQ_LAST(head, headname) \
|
|
|
+ (*(((struct headname *)((head)->tqh_last))->tqh_last))
|
|
|
+#define TAILQ_PREV(elm, headname, field) \
|
|
|
+ (*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+ * Circular queue definitions.
|
|
|
+ */
|
|
|
+#define CIRCLEQ_HEAD(name, type) \
|
|
|
+struct name { \
|
|
|
+ struct type *cqh_first; /* first element */ \
|
|
|
+ struct type *cqh_last; /* last element */ \
|
|
|
+}
|
|
|
+
|
|
|
+#define CIRCLEQ_HEAD_INITIALIZER(head) \
|
|
|
+ { (void *)&head, (void *)&head }
|
|
|
+
|
|
|
+#define CIRCLEQ_ENTRY(type) \
|
|
|
+struct { \
|
|
|
+ struct type *cqe_next; /* next element */ \
|
|
|
+ struct type *cqe_prev; /* previous element */ \
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * Circular queue functions.
|
|
|
+ */
|
|
|
+#define CIRCLEQ_INIT(head) do { \
|
|
|
+ (head)->cqh_first = (void *)(head); \
|
|
|
+ (head)->cqh_last = (void *)(head); \
|
|
|
+} while (/*CONSTCOND*/0)
|
|
|
+
|
|
|
+#define CIRCLEQ_INSERT_AFTER(head, listelm, elm, field) do { \
|
|
|
+ (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); \
|
|
|
+} while (/*CONSTCOND*/0)
|
|
|
+
|
|
|
+#define CIRCLEQ_INSERT_BEFORE(head, listelm, elm, field) do { \
|
|
|
+ (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); \
|
|
|
+} while (/*CONSTCOND*/0)
|
|
|
+
|
|
|
+#define CIRCLEQ_INSERT_HEAD(head, elm, field) do { \
|
|
|
+ (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); \
|
|
|
+} while (/*CONSTCOND*/0)
|
|
|
+
|
|
|
+#define CIRCLEQ_INSERT_TAIL(head, elm, field) do { \
|
|
|
+ (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); \
|
|
|
+} while (/*CONSTCOND*/0)
|
|
|
+
|
|
|
+#define CIRCLEQ_REMOVE(head, elm, field) do { \
|
|
|
+ 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; \
|
|
|
+} while (/*CONSTCOND*/0)
|
|
|
+
|
|
|
+#define CIRCLEQ_FOREACH(var, head, field) \
|
|
|
+ for ((var) = ((head)->cqh_first); \
|
|
|
+ (var) != (const void *)(head); \
|
|
|
+ (var) = ((var)->field.cqe_next))
|
|
|
+
|
|
|
+#define CIRCLEQ_FOREACH_REVERSE(var, head, field) \
|
|
|
+ for ((var) = ((head)->cqh_last); \
|
|
|
+ (var) != (const void *)(head); \
|
|
|
+ (var) = ((var)->field.cqe_prev))
|
|
|
+
|
|
|
+/*
|
|
|
+ * Circular queue access methods.
|
|
|
+ */
|
|
|
+#define CIRCLEQ_EMPTY(head) ((head)->cqh_first == (void *)(head))
|
|
|
+#define CIRCLEQ_FIRST(head) ((head)->cqh_first)
|
|
|
+#define CIRCLEQ_LAST(head) ((head)->cqh_last)
|
|
|
+#define CIRCLEQ_NEXT(elm, field) ((elm)->field.cqe_next)
|
|
|
+#define CIRCLEQ_PREV(elm, field) ((elm)->field.cqe_prev)
|
|
|
+
|
|
|
+#define CIRCLEQ_LOOP_NEXT(head, elm, field) \
|
|
|
+ (((elm)->field.cqe_next == (void *)(head)) \
|
|
|
+ ? ((head)->cqh_first) \
|
|
|
+ : (elm->field.cqe_next))
|
|
|
+#define CIRCLEQ_LOOP_PREV(head, elm, field) \
|
|
|
+ (((elm)->field.cqe_prev == (void *)(head)) \
|
|
|
+ ? ((head)->cqh_last) \
|
|
|
+ : (elm->field.cqe_prev))
|
|
|
+
|
|
|
+#endif /* sys/queue.h */
|
Waldemar Brodkorb