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213 lines
8.4 KiB
C
213 lines
8.4 KiB
C
/*
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* SPDX-FileCopyrightText: 2015-2022 The Apache Software Foundation (ASF)
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* SPDX-FileContributor: 2019-2022 Espressif Systems (Shanghai) CO LTD
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*/
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/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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#ifndef _QUEUE_H_
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#define _QUEUE_H_
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/* The common BSD linked list queue macros are already defined here for ESP-IDF */
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#include <sys/queue.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* This file defines circular queues. The other types of data structures:
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* singly-linked lists, singly-linked tail queues, lists and tail queues
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* are used from sys/queue.h
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*
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* A singly-linked list is headed by a single forward pointer. The elements
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* are singly linked for minimum space and pointer manipulation overhead at
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* the expense of O(n) removal for arbitrary elements. New elements can be
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* added to the list after an existing element or at the head of the list.
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* Elements being removed from the head of the list should use the explicit
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* macro for this purpose for optimum efficiency. A singly-linked list may
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* only be traversed in the forward direction. Singly-linked lists are ideal
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* for applications with large datasets and few or no removals or for
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* implementing a LIFO queue.
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*
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* A singly-linked tail queue is headed by a pair of pointers, one to the
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* head of the list and the other to the tail of the list. The elements are
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* singly linked for minimum space and pointer manipulation overhead at the
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* expense of O(n) removal for arbitrary elements. New elements can be added
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* to the list after an existing element, at the head of the list, or at the
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* end of the list. Elements being removed from the head of the tail queue
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* should use the explicit macro for this purpose for optimum efficiency.
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* A singly-linked tail queue may only be traversed in the forward direction.
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* Singly-linked tail queues are ideal for applications with large datasets
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* and few or no removals or for implementing a FIFO 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 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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* SLIST LIST STAILQ TAILQ CIRCLEQ
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* _HEAD + + + + +
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* _HEAD_INITIALIZER + + + + +
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* _ENTRY + + + + +
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* _INIT + + + + +
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* _EMPTY + + + + +
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* _FIRST + + + + +
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* _NEXT + + + + +
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* _PREV - - - + +
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* _LAST - - + + +
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* _FOREACH + + + + +
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* _FOREACH_REVERSE - - - + +
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* _INSERT_HEAD + + + + +
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* _INSERT_BEFORE - + - + +
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* _INSERT_AFTER + + + + +
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* _INSERT_TAIL - - + + +
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* _REMOVE_HEAD + - + - -
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* _REMOVE + + + + +
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*
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*/
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/*
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* Circular queue declarations.
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*/
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#define CIRCLEQ_HEAD(name, type) \
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struct name { \
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struct type *cqh_first; /* first element */ \
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struct type *cqh_last; /* last element */ \
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}
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#define CIRCLEQ_HEAD_INITIALIZER(head) \
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{ (void *)&(head), (void *)&(head) }
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#define CIRCLEQ_ENTRY(type) \
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struct { \
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struct type *cqe_next; /* next element */ \
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struct type *cqe_prev; /* previous element */ \
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}
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/*
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* Circular queue functions.
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*/
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#define CIRCLEQ_EMPTY(head) ((head)->cqh_first == (void *)(head))
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#define CIRCLEQ_FIRST(head) ((head)->cqh_first)
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#define CIRCLEQ_FOREACH(var, head, field) \
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for ((var) = CIRCLEQ_FIRST((head)); \
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(var) != (void *)(head) || ((var) = NULL); \
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(var) = CIRCLEQ_NEXT((var), field))
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#define CIRCLEQ_FOREACH_REVERSE(var, head, field) \
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for ((var) = CIRCLEQ_LAST((head)); \
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(var) != (void *)(head) || ((var) = NULL); \
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(var) = CIRCLEQ_PREV((var), field))
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#define CIRCLEQ_INIT(head) do { \
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CIRCLEQ_FIRST((head)) = (void *)(head); \
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CIRCLEQ_LAST((head)) = (void *)(head); \
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} while (0)
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#define CIRCLEQ_INSERT_AFTER(head, listelm, elm, field) do { \
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CIRCLEQ_NEXT((elm), field) = CIRCLEQ_NEXT((listelm), field); \
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CIRCLEQ_PREV((elm), field) = (listelm); \
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if (CIRCLEQ_NEXT((listelm), field) == (void *)(head)) \
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CIRCLEQ_LAST((head)) = (elm); \
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else \
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CIRCLEQ_PREV(CIRCLEQ_NEXT((listelm), field), field) = (elm);\
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CIRCLEQ_NEXT((listelm), field) = (elm); \
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} while (0)
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#define CIRCLEQ_INSERT_BEFORE(head, listelm, elm, field) do { \
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CIRCLEQ_NEXT((elm), field) = (listelm); \
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CIRCLEQ_PREV((elm), field) = CIRCLEQ_PREV((listelm), field); \
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if (CIRCLEQ_PREV((listelm), field) == (void *)(head)) \
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CIRCLEQ_FIRST((head)) = (elm); \
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else \
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CIRCLEQ_NEXT(CIRCLEQ_PREV((listelm), field), field) = (elm);\
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CIRCLEQ_PREV((listelm), field) = (elm); \
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} while (0)
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#define CIRCLEQ_INSERT_HEAD(head, elm, field) do { \
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CIRCLEQ_NEXT((elm), field) = CIRCLEQ_FIRST((head)); \
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CIRCLEQ_PREV((elm), field) = (void *)(head); \
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if (CIRCLEQ_LAST((head)) == (void *)(head)) \
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CIRCLEQ_LAST((head)) = (elm); \
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else \
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CIRCLEQ_PREV(CIRCLEQ_FIRST((head)), field) = (elm); \
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CIRCLEQ_FIRST((head)) = (elm); \
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} while (0)
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#define CIRCLEQ_INSERT_TAIL(head, elm, field) do { \
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CIRCLEQ_NEXT((elm), field) = (void *)(head); \
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CIRCLEQ_PREV((elm), field) = CIRCLEQ_LAST((head)); \
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if (CIRCLEQ_FIRST((head)) == (void *)(head)) \
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CIRCLEQ_FIRST((head)) = (elm); \
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else \
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CIRCLEQ_NEXT(CIRCLEQ_LAST((head)), field) = (elm); \
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CIRCLEQ_LAST((head)) = (elm); \
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} while (0)
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#define CIRCLEQ_LAST(head) ((head)->cqh_last)
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#define CIRCLEQ_NEXT(elm,field) ((elm)->field.cqe_next)
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#define CIRCLEQ_PREV(elm,field) ((elm)->field.cqe_prev)
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#define CIRCLEQ_REMOVE(head, elm, field) do { \
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if (CIRCLEQ_NEXT((elm), field) == (void *)(head)) \
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CIRCLEQ_LAST((head)) = CIRCLEQ_PREV((elm), field); \
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else \
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CIRCLEQ_PREV(CIRCLEQ_NEXT((elm), field), field) = \
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CIRCLEQ_PREV((elm), field); \
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if (CIRCLEQ_PREV((elm), field) == (void *)(head)) \
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CIRCLEQ_FIRST((head)) = CIRCLEQ_NEXT((elm), field); \
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else \
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CIRCLEQ_NEXT(CIRCLEQ_PREV((elm), field), field) = \
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CIRCLEQ_NEXT((elm), field); \
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} while (0)
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#ifdef __cplusplus
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}
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#endif
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#endif /* !_SYS_QUEUE_H_ */
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