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/* $NetBSD: queue.h,v 1.52 2009/04/20 09:56:08 mschuett Exp $ */
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/*
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* Qemu version: Copy from netbsd, removed debug code, removed some of
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* the implementations. Left in lists, simple queues, tail queues and
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* circular queues.
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*/
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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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#ifndef QEMU_SYS_QUEUE_H_
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#define QEMU_SYS_QUEUE_H_
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/*
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* This file defines four types of data structures:
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* lists, simple queues, tail queues, and circular queues.
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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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* List definitions.
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*/
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#define QLIST_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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#define QLIST_HEAD_INITIALIZER(head) \
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{ NULL }
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#define QLIST_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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* List functions.
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*/
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#define QLIST_INIT(head) do { \ |
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(head)->lh_first = NULL; \
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} while (/*CONSTCOND*/0) |
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#define QLIST_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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#define QLIST_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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#define QLIST_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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#define QLIST_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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#define QLIST_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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#define QLIST_FOREACH_SAFE(var, head, field, next_var) \
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for ((var) = ((head)->lh_first); \
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(var) && ((next_var) = ((var)->field.le_next), 1); \
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(var) = (next_var)) |
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/*
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* List access methods.
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*/
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#define QLIST_EMPTY(head) ((head)->lh_first == NULL) |
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#define QLIST_FIRST(head) ((head)->lh_first)
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#define QLIST_NEXT(elm, field) ((elm)->field.le_next)
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/*
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* Simple queue definitions.
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*/
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#define QSIMPLEQ_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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#define QSIMPLEQ_HEAD_INITIALIZER(head) \
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{ NULL, &(head).sqh_first }
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#define QSIMPLEQ_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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* Simple queue functions.
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*/
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#define QSIMPLEQ_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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#define QSIMPLEQ_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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#define QSIMPLEQ_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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#define QSIMPLEQ_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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#define QSIMPLEQ_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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#define QSIMPLEQ_REMOVE(head, elm, type, field) do { \ |
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if ((head)->sqh_first == (elm)) { \
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QSIMPLEQ_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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#define QSIMPLEQ_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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#define QSIMPLEQ_FOREACH_SAFE(var, head, field, next) \
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for ((var) = ((head)->sqh_first); \
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(var) && ((next = ((var)->field.sqe_next)), 1); \
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(var) = (next)) |
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#define QSIMPLEQ_CONCAT(head1, head2) do { \ |
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if (!QSIMPLEQ_EMPTY((head2))) { \
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*(head1)->sqh_last = (head2)->sqh_first; \ |
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(head1)->sqh_last = (head2)->sqh_last; \ |
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QSIMPLEQ_INIT((head2)); \ |
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} \ |
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} while (/*CONSTCOND*/0) |
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#define QSIMPLEQ_LAST(head, type, field) \
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(QSIMPLEQ_EMPTY((head)) ? \ |
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NULL : \
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((struct type *)(void *) \ |
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((char *)((head)->sqh_last) - offsetof(struct type, field)))) |
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/*
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* Simple queue access methods.
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*/
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#define QSIMPLEQ_EMPTY(head) ((head)->sqh_first == NULL) |
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#define QSIMPLEQ_FIRST(head) ((head)->sqh_first)
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#define QSIMPLEQ_NEXT(elm, field) ((elm)->field.sqe_next)
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/*
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* Tail queue definitions.
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*/
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#define Q_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 QTAILQ_HEAD(name, type) Q_TAILQ_HEAD(name, struct type,) |
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#define QTAILQ_HEAD_INITIALIZER(head) \
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{ NULL, &(head).tqh_first }
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#define Q_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 */\
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} |
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#define QTAILQ_ENTRY(type) Q_TAILQ_ENTRY(struct type,) |
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/*
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* Tail queue functions.
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*/
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#define QTAILQ_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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#define QTAILQ_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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#define QTAILQ_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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#define QTAILQ_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 = \ |
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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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(listelm)->field.tqe_next = (elm); \ |
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(elm)->field.tqe_prev = &(listelm)->field.tqe_next; \ |
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} while (/*CONSTCOND*/0) |
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#define QTAILQ_INSERT_BEFORE(listelm, elm, field) do { \ |
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(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; \ |
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} while (/*CONSTCOND*/0) |
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#define QTAILQ_REMOVE(head, elm, field) do { \ |
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if (((elm)->field.tqe_next) != NULL) \ |
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(elm)->field.tqe_next->field.tqe_prev = \ |
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(elm)->field.tqe_prev; \ |
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else \
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(head)->tqh_last = (elm)->field.tqe_prev; \ |
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*(elm)->field.tqe_prev = (elm)->field.tqe_next; \ |
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} while (/*CONSTCOND*/0) |
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#define QTAILQ_FOREACH(var, head, field) \
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for ((var) = ((head)->tqh_first); \
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(var); \ |
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(var) = ((var)->field.tqe_next)) |
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#define QTAILQ_FOREACH_SAFE(var, head, field, next_var) \
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for ((var) = ((head)->tqh_first); \
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(var) && ((next_var) = ((var)->field.tqe_next), 1); \
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(var) = (next_var)) |
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#define QTAILQ_FOREACH_REVERSE(var, head, headname, field) \
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for ((var) = (*(((struct headname *)((head)->tqh_last))->tqh_last)); \ |
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(var); \ |
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(var) = (*(((struct headname *)((var)->field.tqe_prev))->tqh_last)))
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/*
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* Tail queue access methods.
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*/
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#define QTAILQ_EMPTY(head) ((head)->tqh_first == NULL) |
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#define QTAILQ_FIRST(head) ((head)->tqh_first)
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#define QTAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
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#define QTAILQ_LAST(head, headname) \
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(*(((struct headname *)((head)->tqh_last))->tqh_last))
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#define QTAILQ_PREV(elm, headname, field) \
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(*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
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/*
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* Circular queue definitions.
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*/
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#define QCIRCLEQ_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 QCIRCLEQ_HEAD_INITIALIZER(head) \
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{ (void *)&head, (void *)&head }
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#define QCIRCLEQ_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 QCIRCLEQ_INIT(head) do { \ |
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(head)->cqh_first = (void *)(head); \
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(head)->cqh_last = (void *)(head); \
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} while (/*CONSTCOND*/0) |
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#define QCIRCLEQ_INSERT_AFTER(head, listelm, elm, field) do { \ |
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(elm)->field.cqe_next = (listelm)->field.cqe_next; \ |
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(elm)->field.cqe_prev = (listelm); \ |
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if ((listelm)->field.cqe_next == (void *)(head)) \ |
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(head)->cqh_last = (elm); \ |
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else \
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(listelm)->field.cqe_next->field.cqe_prev = (elm); \ |
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(listelm)->field.cqe_next = (elm); \ |
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} while (/*CONSTCOND*/0) |
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#define QCIRCLEQ_INSERT_BEFORE(head, listelm, elm, field) do { \ |
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(elm)->field.cqe_next = (listelm); \ |
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(elm)->field.cqe_prev = (listelm)->field.cqe_prev; \ |
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if ((listelm)->field.cqe_prev == (void *)(head)) \ |
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(head)->cqh_first = (elm); \ |
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else \
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(listelm)->field.cqe_prev->field.cqe_next = (elm); \ |
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(listelm)->field.cqe_prev = (elm); \ |
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} while (/*CONSTCOND*/0) |
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#define QCIRCLEQ_INSERT_HEAD(head, elm, field) do { \ |
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(elm)->field.cqe_next = (head)->cqh_first; \ |
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(elm)->field.cqe_prev = (void *)(head); \
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if ((head)->cqh_last == (void *)(head)) \ |
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(head)->cqh_last = (elm); \ |
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else \
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(head)->cqh_first->field.cqe_prev = (elm); \ |
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(head)->cqh_first = (elm); \ |
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} while (/*CONSTCOND*/0) |
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#define QCIRCLEQ_INSERT_TAIL(head, elm, field) do { \ |
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(elm)->field.cqe_next = (void *)(head); \
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(elm)->field.cqe_prev = (head)->cqh_last; \ |
| 401 |
if ((head)->cqh_first == (void *)(head)) \ |
| 402 |
(head)->cqh_first = (elm); \ |
| 403 |
else \
|
| 404 |
(head)->cqh_last->field.cqe_next = (elm); \ |
| 405 |
(head)->cqh_last = (elm); \ |
| 406 |
} while (/*CONSTCOND*/0) |
| 407 |
|
| 408 |
#define QCIRCLEQ_REMOVE(head, elm, field) do { \ |
| 409 |
if ((elm)->field.cqe_next == (void *)(head)) \ |
| 410 |
(head)->cqh_last = (elm)->field.cqe_prev; \ |
| 411 |
else \
|
| 412 |
(elm)->field.cqe_next->field.cqe_prev = \ |
| 413 |
(elm)->field.cqe_prev; \ |
| 414 |
if ((elm)->field.cqe_prev == (void *)(head)) \ |
| 415 |
(head)->cqh_first = (elm)->field.cqe_next; \ |
| 416 |
else \
|
| 417 |
(elm)->field.cqe_prev->field.cqe_next = \ |
| 418 |
(elm)->field.cqe_next; \ |
| 419 |
} while (/*CONSTCOND*/0) |
| 420 |
|
| 421 |
#define QCIRCLEQ_FOREACH(var, head, field) \
|
| 422 |
for ((var) = ((head)->cqh_first); \
|
| 423 |
(var) != (const void *)(head); \ |
| 424 |
(var) = ((var)->field.cqe_next)) |
| 425 |
|
| 426 |
#define QCIRCLEQ_FOREACH_REVERSE(var, head, field) \
|
| 427 |
for ((var) = ((head)->cqh_last); \
|
| 428 |
(var) != (const void *)(head); \ |
| 429 |
(var) = ((var)->field.cqe_prev)) |
| 430 |
|
| 431 |
/*
|
| 432 |
* Circular queue access methods.
|
| 433 |
*/
|
| 434 |
#define QCIRCLEQ_EMPTY(head) ((head)->cqh_first == (void *)(head)) |
| 435 |
#define QCIRCLEQ_FIRST(head) ((head)->cqh_first)
|
| 436 |
#define QCIRCLEQ_LAST(head) ((head)->cqh_last)
|
| 437 |
#define QCIRCLEQ_NEXT(elm, field) ((elm)->field.cqe_next)
|
| 438 |
#define QCIRCLEQ_PREV(elm, field) ((elm)->field.cqe_prev)
|
| 439 |
|
| 440 |
#define QCIRCLEQ_LOOP_NEXT(head, elm, field) \
|
| 441 |
(((elm)->field.cqe_next == (void *)(head)) \
|
| 442 |
? ((head)->cqh_first) \ |
| 443 |
: (elm->field.cqe_next)) |
| 444 |
#define QCIRCLEQ_LOOP_PREV(head, elm, field) \
|
| 445 |
(((elm)->field.cqe_prev == (void *)(head)) \
|
| 446 |
? ((head)->cqh_last) \ |
| 447 |
: (elm->field.cqe_prev)) |
| 448 |
|
| 449 |
#endif /* !QEMU_SYS_QUEUE_H_ */ |