923edabe6c
queue functions. This includes a private queue.h header derived from FreeBSD. It is simpler to just use our own header rather than try to deal with macros that may or may not be present in various queue.h incarnations.
716 lines
23 KiB
C
716 lines
23 KiB
C
/*
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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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* $FreeBSD: head/sys/sys/queue.h 251887 2013-06-18 02:57:56Z lstewart $
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*/
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#ifndef _SUDO_QUEUE_H_
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#define _SUDO_QUEUE_H_
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/*
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* This file defines four types of data structures: singly-linked lists,
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* singly-linked tail queues, lists and tail queues.
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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 be traversed in either 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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* 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
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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_FROM + + + +
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* _FOREACH_SAFE + + + +
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* _FOREACH_FROM_SAFE + + + +
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* _FOREACH_REVERSE - - - +
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* _FOREACH_REVERSE_FROM - - - +
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* _FOREACH_REVERSE_SAFE - - - +
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* _FOREACH_REVERSE_FROM_SAFE - - - +
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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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* _CONCAT - - + +
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* _REMOVE_AFTER + - + -
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* _REMOVE_HEAD + - + -
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* _REMOVE + + + +
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* _SWAP + + + +
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*
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*/
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#ifdef QUEUE_MACRO_DEBUG
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/* Store the last 2 places the queue element or head was altered */
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struct qm_trace {
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unsigned long lastline;
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unsigned long prevline;
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const char *lastfile;
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const char *prevfile;
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};
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#undef TRACEBUF
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#define TRACEBUF struct qm_trace trace;
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#undef TRACEBUF_INITIALIZER
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#define TRACEBUF_INITIALIZER { __FILE__, __LINE__, NULL, 0 } ,
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#undef TRASHIT
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#define TRASHIT(x) do {(x) = (void *)-1;} while (0)
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#undef QMD_SAVELINK
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#define QMD_SAVELINK(name, link) void **name = (void *)&(link)
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#undef QMD_TRACE_HEAD
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#define QMD_TRACE_HEAD(head) do { \
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(head)->trace.prevline = (head)->trace.lastline; \
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(head)->trace.prevfile = (head)->trace.lastfile; \
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(head)->trace.lastline = __LINE__; \
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(head)->trace.lastfile = __FILE__; \
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} while (0)
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#undef QMD_TRACE_ELEM
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#define QMD_TRACE_ELEM(elem) do { \
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(elem)->trace.prevline = (elem)->trace.lastline; \
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(elem)->trace.prevfile = (elem)->trace.lastfile; \
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(elem)->trace.lastline = __LINE__; \
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(elem)->trace.lastfile = __FILE__; \
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} while (0)
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#else
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#undef QMD_TRACE_ELEM
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#define QMD_TRACE_ELEM(elem)
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#undef QMD_TRACE_HEAD
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#define QMD_TRACE_HEAD(head)
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#undef QMD_SAVELINK
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#define QMD_SAVELINK(name, link)
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#undef TRACEBUF
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#define TRACEBUF
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#undef TRACEBUF_INITIALIZER
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#define TRACEBUF_INITIALIZER
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#undef TRASHIT
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#define TRASHIT(x)
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#endif /* QUEUE_MACRO_DEBUG */
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/*
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* Singly-linked List declarations.
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*/
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#undef SLIST_HEAD
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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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#undef SLIST_HEAD_INITIALIZER
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#define SLIST_HEAD_INITIALIZER(head) \
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{ NULL }
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#undef SLIST_ENTRY
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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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* Singly-linked List functions.
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*/
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#undef SLIST_EMPTY
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#define SLIST_EMPTY(head) ((head)->slh_first == NULL)
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#undef SLIST_FIRST
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#define SLIST_FIRST(head) ((head)->slh_first)
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#undef SLIST_FOREACH
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#define SLIST_FOREACH(var, head, field) \
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for ((var) = SLIST_FIRST((head)); \
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(var); \
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(var) = SLIST_NEXT((var), field))
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#undef SLIST_FOREACH_FROM
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#define SLIST_FOREACH_FROM(var, head, field) \
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for ((var) = ((var) ? (var) : SLIST_FIRST((head))); \
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(var); \
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(var) = SLIST_NEXT((var), field))
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#undef SLIST_FOREACH_SAFE
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#define SLIST_FOREACH_SAFE(var, head, field, tvar) \
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for ((var) = SLIST_FIRST((head)); \
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(var) && ((tvar) = SLIST_NEXT((var), field), 1); \
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(var) = (tvar))
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#undef SLIST_FOREACH_FROM_SAFE
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#define SLIST_FOREACH_FROM_SAFE(var, head, field, tvar) \
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for ((var) = ((var) ? (var) : SLIST_FIRST((head))); \
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(var) && ((tvar) = SLIST_NEXT((var), field), 1); \
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(var) = (tvar))
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#undef SLIST_FOREACH_PREVPTR
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#define SLIST_FOREACH_PREVPTR(var, varp, head, field) \
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for ((varp) = &SLIST_FIRST((head)); \
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((var) = *(varp)) != NULL; \
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(varp) = &SLIST_NEXT((var), field))
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#undef SLIST_INIT
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#define SLIST_INIT(head) do { \
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SLIST_FIRST((head)) = NULL; \
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} while (0)
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#undef SLIST_INSERT_AFTER
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#define SLIST_INSERT_AFTER(slistelm, elm, field) do { \
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SLIST_NEXT((elm), field) = SLIST_NEXT((slistelm), field); \
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SLIST_NEXT((slistelm), field) = (elm); \
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} while (0)
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#undef SLIST_INSERT_HEAD
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#define SLIST_INSERT_HEAD(head, elm, field) do { \
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SLIST_NEXT((elm), field) = SLIST_FIRST((head)); \
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SLIST_FIRST((head)) = (elm); \
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} while (0)
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#undef SLIST_NEXT
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#define SLIST_NEXT(elm, field) ((elm)->field.sle_next)
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#undef SLIST_REMOVE
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#define SLIST_REMOVE(head, elm, type, field) do { \
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QMD_SAVELINK(oldnext, (elm)->field.sle_next); \
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if (SLIST_FIRST((head)) == (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 = SLIST_FIRST((head)); \
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while (SLIST_NEXT(curelm, field) != (elm)) \
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curelm = SLIST_NEXT(curelm, field); \
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SLIST_REMOVE_AFTER(curelm, field); \
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} \
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TRASHIT(*oldnext); \
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} while (0)
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#undef SLIST_REMOVE_AFTER
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#define SLIST_REMOVE_AFTER(elm, field) do { \
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SLIST_NEXT(elm, field) = \
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SLIST_NEXT(SLIST_NEXT(elm, field), field); \
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} while (0)
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#undef SLIST_REMOVE_HEAD
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#define SLIST_REMOVE_HEAD(head, field) do { \
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SLIST_FIRST((head)) = SLIST_NEXT(SLIST_FIRST((head)), field); \
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} while (0)
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#undef SLIST_SWAP
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#define SLIST_SWAP(head1, head2, type) do { \
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struct type *swap_first = SLIST_FIRST(head1); \
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SLIST_FIRST(head1) = SLIST_FIRST(head2); \
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SLIST_FIRST(head2) = swap_first; \
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} while (0)
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/*
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* Singly-linked Tail queue declarations.
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*/
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#undef STAILQ_HEAD
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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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#undef STAILQ_HEAD_INITIALIZER
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#define STAILQ_HEAD_INITIALIZER(head) \
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{ NULL, &(head).stqh_first }
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#undef STAILQ_ENTRY
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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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* Singly-linked Tail queue functions.
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*/
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#undef STAILQ_CONCAT
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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 (0)
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#undef STAILQ_EMPTY
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#define STAILQ_EMPTY(head) ((head)->stqh_first == NULL)
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#undef STAILQ_FIRST
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#define STAILQ_FIRST(head) ((head)->stqh_first)
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#undef STAILQ_FOREACH
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#define STAILQ_FOREACH(var, head, field) \
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for ((var) = STAILQ_FIRST((head)); \
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(var); \
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(var) = STAILQ_NEXT((var), field))
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#undef STAILQ_FOREACH_FROM
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#define STAILQ_FOREACH_FROM(var, head, field) \
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for ((var) = ((var) ? (var) : STAILQ_FIRST((head))); \
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(var); \
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(var) = STAILQ_NEXT((var), field))
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#undef STAILQ_FOREACH_SAFE
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#define STAILQ_FOREACH_SAFE(var, head, field, tvar) \
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for ((var) = STAILQ_FIRST((head)); \
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(var) && ((tvar) = STAILQ_NEXT((var), field), 1); \
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(var) = (tvar))
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#undef STAILQ_FOREACH_FROM_SAFE
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#define STAILQ_FOREACH_FROM_SAFE(var, head, field, tvar) \
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for ((var) = ((var) ? (var) : STAILQ_FIRST((head))); \
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(var) && ((tvar) = STAILQ_NEXT((var), field), 1); \
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(var) = (tvar))
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#undef STAILQ_INIT
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#define STAILQ_INIT(head) do { \
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STAILQ_FIRST((head)) = NULL; \
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(head)->stqh_last = &STAILQ_FIRST((head)); \
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} while (0)
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#undef STAILQ_INSERT_AFTER
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#define STAILQ_INSERT_AFTER(head, tqelm, elm, field) do { \
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if ((STAILQ_NEXT((elm), field) = STAILQ_NEXT((tqelm), field)) == NULL)\
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(head)->stqh_last = &STAILQ_NEXT((elm), field); \
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STAILQ_NEXT((tqelm), field) = (elm); \
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} while (0)
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#undef STAILQ_INSERT_HEAD
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#define STAILQ_INSERT_HEAD(head, elm, field) do { \
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if ((STAILQ_NEXT((elm), field) = STAILQ_FIRST((head))) == NULL) \
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(head)->stqh_last = &STAILQ_NEXT((elm), field); \
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STAILQ_FIRST((head)) = (elm); \
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} while (0)
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#undef STAILQ_INSERT_TAIL
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#define STAILQ_INSERT_TAIL(head, elm, field) do { \
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STAILQ_NEXT((elm), field) = NULL; \
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*(head)->stqh_last = (elm); \
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(head)->stqh_last = &STAILQ_NEXT((elm), field); \
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} while (0)
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#undef STAILQ_LAST
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#define STAILQ_LAST(head, type, field) \
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(STAILQ_EMPTY((head)) ? NULL : \
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__containerof((head)->stqh_last, struct type, field.stqe_next))
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#undef STAILQ_NEXT
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#define STAILQ_NEXT(elm, field) ((elm)->field.stqe_next)
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#undef STAILQ_REMOVE
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#define STAILQ_REMOVE(head, elm, type, field) do { \
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QMD_SAVELINK(oldnext, (elm)->field.stqe_next); \
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if (STAILQ_FIRST((head)) == (elm)) { \
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STAILQ_REMOVE_HEAD((head), field); \
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} \
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else { \
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struct type *curelm = STAILQ_FIRST((head)); \
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while (STAILQ_NEXT(curelm, field) != (elm)) \
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curelm = STAILQ_NEXT(curelm, field); \
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STAILQ_REMOVE_AFTER(head, curelm, field); \
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} \
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TRASHIT(*oldnext); \
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} while (0)
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#undef STAILQ_REMOVE_AFTER
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#define STAILQ_REMOVE_AFTER(head, elm, field) do { \
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if ((STAILQ_NEXT(elm, field) = \
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STAILQ_NEXT(STAILQ_NEXT(elm, field), field)) == NULL) \
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(head)->stqh_last = &STAILQ_NEXT((elm), field); \
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} while (0)
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#undef STAILQ_REMOVE_HEAD
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#define STAILQ_REMOVE_HEAD(head, field) do { \
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if ((STAILQ_FIRST((head)) = \
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STAILQ_NEXT(STAILQ_FIRST((head)), field)) == NULL) \
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(head)->stqh_last = &STAILQ_FIRST((head)); \
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} while (0)
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#undef STAILQ_SWAP
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#define STAILQ_SWAP(head1, head2, type) do { \
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struct type *swap_first = STAILQ_FIRST(head1); \
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struct type **swap_last = (head1)->stqh_last; \
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STAILQ_FIRST(head1) = STAILQ_FIRST(head2); \
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(head1)->stqh_last = (head2)->stqh_last; \
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STAILQ_FIRST(head2) = swap_first; \
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(head2)->stqh_last = swap_last; \
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if (STAILQ_EMPTY(head1)) \
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(head1)->stqh_last = &STAILQ_FIRST(head1); \
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if (STAILQ_EMPTY(head2)) \
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(head2)->stqh_last = &STAILQ_FIRST(head2); \
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} while (0)
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/*
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* List declarations.
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*/
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#undef LIST_HEAD
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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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#undef LIST_HEAD_INITIALIZER
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#define LIST_HEAD_INITIALIZER(head) \
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{ NULL }
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#undef LIST_ENTRY
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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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* List functions.
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*/
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#undef LIST_EMPTY
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#define LIST_EMPTY(head) ((head)->lh_first == NULL)
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#undef LIST_FIRST
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#define LIST_FIRST(head) ((head)->lh_first)
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#undef LIST_FOREACH
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#define LIST_FOREACH(var, head, field) \
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for ((var) = LIST_FIRST((head)); \
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(var); \
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(var) = LIST_NEXT((var), field))
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#undef LIST_FOREACH_FROM
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#define LIST_FOREACH_FROM(var, head, field) \
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for ((var) = ((var) ? (var) : LIST_FIRST((head))); \
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(var); \
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(var) = LIST_NEXT((var), field))
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#undef LIST_FOREACH_SAFE
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#define LIST_FOREACH_SAFE(var, head, field, tvar) \
|
|
for ((var) = LIST_FIRST((head)); \
|
|
(var) && ((tvar) = LIST_NEXT((var), field), 1); \
|
|
(var) = (tvar))
|
|
|
|
#undef LIST_FOREACH_FROM_SAFE
|
|
#define LIST_FOREACH_FROM_SAFE(var, head, field, tvar) \
|
|
for ((var) = ((var) ? (var) : LIST_FIRST((head))); \
|
|
(var) && ((tvar) = LIST_NEXT((var), field), 1); \
|
|
(var) = (tvar))
|
|
|
|
#undef LIST_INIT
|
|
#define LIST_INIT(head) do { \
|
|
LIST_FIRST((head)) = NULL; \
|
|
} while (0)
|
|
|
|
#undef LIST_INSERT_AFTER
|
|
#define LIST_INSERT_AFTER(listelm, elm, field) do { \
|
|
if ((LIST_NEXT((elm), field) = LIST_NEXT((listelm), field)) != NULL)\
|
|
LIST_NEXT((listelm), field)->field.le_prev = \
|
|
&LIST_NEXT((elm), field); \
|
|
LIST_NEXT((listelm), field) = (elm); \
|
|
(elm)->field.le_prev = &LIST_NEXT((listelm), field); \
|
|
} while (0)
|
|
|
|
#undef LIST_INSERT_BEFORE
|
|
#define LIST_INSERT_BEFORE(listelm, elm, field) do { \
|
|
(elm)->field.le_prev = (listelm)->field.le_prev; \
|
|
LIST_NEXT((elm), field) = (listelm); \
|
|
*(listelm)->field.le_prev = (elm); \
|
|
(listelm)->field.le_prev = &LIST_NEXT((elm), field); \
|
|
} while (0)
|
|
|
|
#undef LIST_INSERT_HEAD
|
|
#define LIST_INSERT_HEAD(head, elm, field) do { \
|
|
if ((LIST_NEXT((elm), field) = LIST_FIRST((head))) != NULL) \
|
|
LIST_FIRST((head))->field.le_prev = &LIST_NEXT((elm), field);\
|
|
LIST_FIRST((head)) = (elm); \
|
|
(elm)->field.le_prev = &LIST_FIRST((head)); \
|
|
} while (0)
|
|
|
|
#undef LIST_NEXT
|
|
#define LIST_NEXT(elm, field) ((elm)->field.le_next)
|
|
|
|
#undef LIST_PREV
|
|
#define LIST_PREV(elm, head, type, field) \
|
|
((elm)->field.le_prev == &LIST_FIRST((head)) ? NULL : \
|
|
__containerof((elm)->field.le_prev, struct type, field.le_next))
|
|
|
|
#undef LIST_REMOVE
|
|
#define LIST_REMOVE(elm, field) do { \
|
|
QMD_SAVELINK(oldnext, (elm)->field.le_next); \
|
|
QMD_SAVELINK(oldprev, (elm)->field.le_prev); \
|
|
if (LIST_NEXT((elm), field) != NULL) \
|
|
LIST_NEXT((elm), field)->field.le_prev = \
|
|
(elm)->field.le_prev; \
|
|
*(elm)->field.le_prev = LIST_NEXT((elm), field); \
|
|
TRASHIT(*oldnext); \
|
|
TRASHIT(*oldprev); \
|
|
} while (0)
|
|
|
|
#undef LIST_SWAP
|
|
#define LIST_SWAP(head1, head2, type, field) do { \
|
|
struct type *swap_tmp = LIST_FIRST((head1)); \
|
|
LIST_FIRST((head1)) = LIST_FIRST((head2)); \
|
|
LIST_FIRST((head2)) = swap_tmp; \
|
|
if ((swap_tmp = LIST_FIRST((head1))) != NULL) \
|
|
swap_tmp->field.le_prev = &LIST_FIRST((head1)); \
|
|
if ((swap_tmp = LIST_FIRST((head2))) != NULL) \
|
|
swap_tmp->field.le_prev = &LIST_FIRST((head2)); \
|
|
} while (0)
|
|
|
|
/*
|
|
* Tail queue declarations.
|
|
*/
|
|
#undef TAILQ_HEAD
|
|
#define TAILQ_HEAD(name, type) \
|
|
struct name { \
|
|
struct type *tqh_first; /* first element */ \
|
|
struct type **tqh_last; /* addr of last next element */ \
|
|
TRACEBUF \
|
|
}
|
|
|
|
#undef TAILQ_HEAD_INITIALIZER
|
|
#define TAILQ_HEAD_INITIALIZER(head) \
|
|
{ NULL, &(head).tqh_first, TRACEBUF_INITIALIZER }
|
|
|
|
#undef TAILQ_ENTRY
|
|
#define TAILQ_ENTRY(type) \
|
|
struct { \
|
|
struct type *tqe_next; /* next element */ \
|
|
struct type **tqe_prev; /* address of previous next element */ \
|
|
TRACEBUF \
|
|
}
|
|
|
|
/*
|
|
* Tail queue functions.
|
|
*/
|
|
#undef TAILQ_CONCAT
|
|
#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)); \
|
|
QMD_TRACE_HEAD(head1); \
|
|
QMD_TRACE_HEAD(head2); \
|
|
} \
|
|
} while (0)
|
|
|
|
#undef TAILQ_EMPTY
|
|
#define TAILQ_EMPTY(head) ((head)->tqh_first == NULL)
|
|
|
|
#undef TAILQ_FIRST
|
|
#define TAILQ_FIRST(head) ((head)->tqh_first)
|
|
|
|
#undef TAILQ_FOREACH
|
|
#define TAILQ_FOREACH(var, head, field) \
|
|
for ((var) = TAILQ_FIRST((head)); \
|
|
(var); \
|
|
(var) = TAILQ_NEXT((var), field))
|
|
|
|
#undef TAILQ_FOREACH_FROM
|
|
#define TAILQ_FOREACH_FROM(var, head, field) \
|
|
for ((var) = ((var) ? (var) : TAILQ_FIRST((head))); \
|
|
(var); \
|
|
(var) = TAILQ_NEXT((var), field))
|
|
|
|
#undef TAILQ_FOREACH_SAFE
|
|
#define TAILQ_FOREACH_SAFE(var, head, field, tvar) \
|
|
for ((var) = TAILQ_FIRST((head)); \
|
|
(var) && ((tvar) = TAILQ_NEXT((var), field), 1); \
|
|
(var) = (tvar))
|
|
|
|
#undef TAILQ_FOREACH_FROM_SAFE
|
|
#define TAILQ_FOREACH_FROM_SAFE(var, head, field, tvar) \
|
|
for ((var) = ((var) ? (var) : TAILQ_FIRST((head))); \
|
|
(var) && ((tvar) = TAILQ_NEXT((var), field), 1); \
|
|
(var) = (tvar))
|
|
|
|
#undef TAILQ_FOREACH_REVERSE
|
|
#define TAILQ_FOREACH_REVERSE(var, head, headname, field) \
|
|
for ((var) = TAILQ_LAST((head), headname); \
|
|
(var); \
|
|
(var) = TAILQ_PREV((var), headname, field))
|
|
|
|
#undef TAILQ_FOREACH_REVERSE_FROM
|
|
#define TAILQ_FOREACH_REVERSE_FROM(var, head, headname, field) \
|
|
for ((var) = ((var) ? (var) : TAILQ_LAST((head), headname)); \
|
|
(var); \
|
|
(var) = TAILQ_PREV((var), headname, field))
|
|
|
|
#undef TAILQ_FOREACH_REVERSE_SAFE
|
|
#define TAILQ_FOREACH_REVERSE_SAFE(var, head, headname, field, tvar) \
|
|
for ((var) = TAILQ_LAST((head), headname); \
|
|
(var) && ((tvar) = TAILQ_PREV((var), headname, field), 1); \
|
|
(var) = (tvar))
|
|
|
|
#undef TAILQ_FOREACH_REVERSE_FROM_SAFE
|
|
#define TAILQ_FOREACH_REVERSE_FROM_SAFE(var, head, headname, field, tvar) \
|
|
for ((var) = ((var) ? (var) : TAILQ_LAST((head), headname)); \
|
|
(var) && ((tvar) = TAILQ_PREV((var), headname, field), 1); \
|
|
(var) = (tvar))
|
|
|
|
#undef TAILQ_INIT
|
|
#define TAILQ_INIT(head) do { \
|
|
TAILQ_FIRST((head)) = NULL; \
|
|
(head)->tqh_last = &TAILQ_FIRST((head)); \
|
|
QMD_TRACE_HEAD(head); \
|
|
} while (0)
|
|
|
|
#undef TAILQ_INSERT_AFTER
|
|
#define TAILQ_INSERT_AFTER(head, listelm, elm, field) do { \
|
|
if ((TAILQ_NEXT((elm), field) = TAILQ_NEXT((listelm), field)) != NULL)\
|
|
TAILQ_NEXT((elm), field)->field.tqe_prev = \
|
|
&TAILQ_NEXT((elm), field); \
|
|
else { \
|
|
(head)->tqh_last = &TAILQ_NEXT((elm), field); \
|
|
QMD_TRACE_HEAD(head); \
|
|
} \
|
|
TAILQ_NEXT((listelm), field) = (elm); \
|
|
(elm)->field.tqe_prev = &TAILQ_NEXT((listelm), field); \
|
|
QMD_TRACE_ELEM(&(elm)->field); \
|
|
QMD_TRACE_ELEM(&listelm->field); \
|
|
} while (0)
|
|
|
|
#undef TAILQ_INSERT_BEFORE
|
|
#define TAILQ_INSERT_BEFORE(listelm, elm, field) do { \
|
|
(elm)->field.tqe_prev = (listelm)->field.tqe_prev; \
|
|
TAILQ_NEXT((elm), field) = (listelm); \
|
|
*(listelm)->field.tqe_prev = (elm); \
|
|
(listelm)->field.tqe_prev = &TAILQ_NEXT((elm), field); \
|
|
QMD_TRACE_ELEM(&(elm)->field); \
|
|
QMD_TRACE_ELEM(&listelm->field); \
|
|
} while (0)
|
|
|
|
#undef TAILQ_INSERT_HEAD
|
|
#define TAILQ_INSERT_HEAD(head, elm, field) do { \
|
|
if ((TAILQ_NEXT((elm), field) = TAILQ_FIRST((head))) != NULL) \
|
|
TAILQ_FIRST((head))->field.tqe_prev = \
|
|
&TAILQ_NEXT((elm), field); \
|
|
else \
|
|
(head)->tqh_last = &TAILQ_NEXT((elm), field); \
|
|
TAILQ_FIRST((head)) = (elm); \
|
|
(elm)->field.tqe_prev = &TAILQ_FIRST((head)); \
|
|
QMD_TRACE_HEAD(head); \
|
|
QMD_TRACE_ELEM(&(elm)->field); \
|
|
} while (0)
|
|
|
|
#undef TAILQ_INSERT_TAIL
|
|
#define TAILQ_INSERT_TAIL(head, elm, field) do { \
|
|
TAILQ_NEXT((elm), field) = NULL; \
|
|
(elm)->field.tqe_prev = (head)->tqh_last; \
|
|
*(head)->tqh_last = (elm); \
|
|
(head)->tqh_last = &TAILQ_NEXT((elm), field); \
|
|
QMD_TRACE_HEAD(head); \
|
|
QMD_TRACE_ELEM(&(elm)->field); \
|
|
} while (0)
|
|
|
|
#undef TAILQ_LAST
|
|
#define TAILQ_LAST(head, headname) \
|
|
(*(((struct headname *)((head)->tqh_last))->tqh_last))
|
|
|
|
#undef TAILQ_NEXT
|
|
#define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
|
|
|
|
#undef TAILQ_PREV
|
|
#define TAILQ_PREV(elm, headname, field) \
|
|
(*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
|
|
|
|
#undef TAILQ_REMOVE
|
|
#define TAILQ_REMOVE(head, elm, field) do { \
|
|
QMD_SAVELINK(oldnext, (elm)->field.tqe_next); \
|
|
QMD_SAVELINK(oldprev, (elm)->field.tqe_prev); \
|
|
if ((TAILQ_NEXT((elm), field)) != NULL) \
|
|
TAILQ_NEXT((elm), field)->field.tqe_prev = \
|
|
(elm)->field.tqe_prev; \
|
|
else { \
|
|
(head)->tqh_last = (elm)->field.tqe_prev; \
|
|
QMD_TRACE_HEAD(head); \
|
|
} \
|
|
*(elm)->field.tqe_prev = TAILQ_NEXT((elm), field); \
|
|
TRASHIT(*oldnext); \
|
|
TRASHIT(*oldprev); \
|
|
QMD_TRACE_ELEM(&(elm)->field); \
|
|
} while (0)
|
|
|
|
#undef TAILQ_SWAP
|
|
#define TAILQ_SWAP(head1, head2, type, field) do { \
|
|
struct type *swap_first = (head1)->tqh_first; \
|
|
struct type **swap_last = (head1)->tqh_last; \
|
|
(head1)->tqh_first = (head2)->tqh_first; \
|
|
(head1)->tqh_last = (head2)->tqh_last; \
|
|
(head2)->tqh_first = swap_first; \
|
|
(head2)->tqh_last = swap_last; \
|
|
if ((swap_first = (head1)->tqh_first) != NULL) \
|
|
swap_first->field.tqe_prev = &(head1)->tqh_first; \
|
|
else \
|
|
(head1)->tqh_last = &(head1)->tqh_first; \
|
|
if ((swap_first = (head2)->tqh_first) != NULL) \
|
|
swap_first->field.tqe_prev = &(head2)->tqh_first; \
|
|
else \
|
|
(head2)->tqh_last = &(head2)->tqh_first; \
|
|
} while (0)
|
|
|
|
#endif /* !_SUDO_QUEUE_H_ */
|