Cleaned up with scripts/clean-header-guards.pl. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Richard Henderson <rth@twiddle.net>
440 lines
21 KiB
C
440 lines
21 KiB
C
/* $NetBSD: queue.h,v 1.52 2009/04/20 09:56:08 mschuett Exp $ */
|
|
|
|
/*
|
|
* QEMU version: Copy from netbsd, removed debug code, removed some of
|
|
* the implementations. Left in singly-linked lists, lists, simple
|
|
* queues, and tail queues.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)queue.h 8.5 (Berkeley) 8/20/94
|
|
*/
|
|
|
|
#ifndef QEMU_SYS_QUEUE_H
|
|
#define QEMU_SYS_QUEUE_H
|
|
|
|
/*
|
|
* This file defines four types of data structures: singly-linked lists,
|
|
* lists, simple queues, and tail queues.
|
|
*
|
|
* A singly-linked list is headed by a single forward pointer. The
|
|
* elements are singly linked for minimum space and pointer manipulation
|
|
* overhead at the expense of O(n) removal for arbitrary elements. New
|
|
* elements can be added to the list after an existing element or at the
|
|
* head of the list. Elements being removed from the head of the list
|
|
* should use the explicit macro for this purpose for optimum
|
|
* efficiency. A singly-linked list may only be traversed in the forward
|
|
* direction. Singly-linked lists are ideal for applications with large
|
|
* datasets and few or no removals or for implementing a LIFO queue.
|
|
*
|
|
* A list is headed by a single forward pointer (or an array of forward
|
|
* pointers for a hash table header). The elements are doubly linked
|
|
* so that an arbitrary element can be removed without a need to
|
|
* traverse the list. New elements can be added to the list before
|
|
* or after an existing element or at the head of the list. A list
|
|
* may only be traversed in the forward direction.
|
|
*
|
|
* A simple queue is headed by a pair of pointers, one the head of the
|
|
* list and the other to the tail of the list. The elements are singly
|
|
* linked to save space, so elements can only be removed from the
|
|
* head of the list. New elements can be added to the list after
|
|
* an existing element, at the head of the list, or at the end of the
|
|
* list. A simple queue may only be traversed in the forward direction.
|
|
*
|
|
* A tail queue is headed by a pair of pointers, one to the head of the
|
|
* list and the other to the tail of the list. The elements are doubly
|
|
* linked so that an arbitrary element can be removed without a need to
|
|
* traverse the list. New elements can be added to the list before or
|
|
* after an existing element, at the head of the list, or at the end of
|
|
* the list. A tail queue may be traversed in either direction.
|
|
*
|
|
* For details on the use of these macros, see the queue(3) manual page.
|
|
*/
|
|
|
|
#include "qemu/atomic.h" /* for smp_wmb() */
|
|
|
|
/*
|
|
* List definitions.
|
|
*/
|
|
#define QLIST_HEAD(name, type) \
|
|
struct name { \
|
|
struct type *lh_first; /* first element */ \
|
|
}
|
|
|
|
#define QLIST_HEAD_INITIALIZER(head) \
|
|
{ NULL }
|
|
|
|
#define QLIST_ENTRY(type) \
|
|
struct { \
|
|
struct type *le_next; /* next element */ \
|
|
struct type **le_prev; /* address of previous next element */ \
|
|
}
|
|
|
|
/*
|
|
* List functions.
|
|
*/
|
|
#define QLIST_INIT(head) do { \
|
|
(head)->lh_first = NULL; \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QLIST_SWAP(dstlist, srclist, field) do { \
|
|
void *tmplist; \
|
|
tmplist = (srclist)->lh_first; \
|
|
(srclist)->lh_first = (dstlist)->lh_first; \
|
|
if ((srclist)->lh_first != NULL) { \
|
|
(srclist)->lh_first->field.le_prev = &(srclist)->lh_first; \
|
|
} \
|
|
(dstlist)->lh_first = tmplist; \
|
|
if ((dstlist)->lh_first != NULL) { \
|
|
(dstlist)->lh_first->field.le_prev = &(dstlist)->lh_first; \
|
|
} \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QLIST_INSERT_AFTER(listelm, elm, field) do { \
|
|
if (((elm)->field.le_next = (listelm)->field.le_next) != NULL) \
|
|
(listelm)->field.le_next->field.le_prev = \
|
|
&(elm)->field.le_next; \
|
|
(listelm)->field.le_next = (elm); \
|
|
(elm)->field.le_prev = &(listelm)->field.le_next; \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QLIST_INSERT_BEFORE(listelm, elm, field) do { \
|
|
(elm)->field.le_prev = (listelm)->field.le_prev; \
|
|
(elm)->field.le_next = (listelm); \
|
|
*(listelm)->field.le_prev = (elm); \
|
|
(listelm)->field.le_prev = &(elm)->field.le_next; \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QLIST_INSERT_HEAD(head, elm, field) do { \
|
|
if (((elm)->field.le_next = (head)->lh_first) != NULL) \
|
|
(head)->lh_first->field.le_prev = &(elm)->field.le_next;\
|
|
(head)->lh_first = (elm); \
|
|
(elm)->field.le_prev = &(head)->lh_first; \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QLIST_REMOVE(elm, field) do { \
|
|
if ((elm)->field.le_next != NULL) \
|
|
(elm)->field.le_next->field.le_prev = \
|
|
(elm)->field.le_prev; \
|
|
*(elm)->field.le_prev = (elm)->field.le_next; \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QLIST_FOREACH(var, head, field) \
|
|
for ((var) = ((head)->lh_first); \
|
|
(var); \
|
|
(var) = ((var)->field.le_next))
|
|
|
|
#define QLIST_FOREACH_SAFE(var, head, field, next_var) \
|
|
for ((var) = ((head)->lh_first); \
|
|
(var) && ((next_var) = ((var)->field.le_next), 1); \
|
|
(var) = (next_var))
|
|
|
|
/*
|
|
* List access methods.
|
|
*/
|
|
#define QLIST_EMPTY(head) ((head)->lh_first == NULL)
|
|
#define QLIST_FIRST(head) ((head)->lh_first)
|
|
#define QLIST_NEXT(elm, field) ((elm)->field.le_next)
|
|
|
|
|
|
/*
|
|
* Singly-linked List definitions.
|
|
*/
|
|
#define QSLIST_HEAD(name, type) \
|
|
struct name { \
|
|
struct type *slh_first; /* first element */ \
|
|
}
|
|
|
|
#define QSLIST_HEAD_INITIALIZER(head) \
|
|
{ NULL }
|
|
|
|
#define QSLIST_ENTRY(type) \
|
|
struct { \
|
|
struct type *sle_next; /* next element */ \
|
|
}
|
|
|
|
/*
|
|
* Singly-linked List functions.
|
|
*/
|
|
#define QSLIST_INIT(head) do { \
|
|
(head)->slh_first = NULL; \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QSLIST_INSERT_AFTER(slistelm, elm, field) do { \
|
|
(elm)->field.sle_next = (slistelm)->field.sle_next; \
|
|
(slistelm)->field.sle_next = (elm); \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QSLIST_INSERT_HEAD(head, elm, field) do { \
|
|
(elm)->field.sle_next = (head)->slh_first; \
|
|
(head)->slh_first = (elm); \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QSLIST_INSERT_HEAD_ATOMIC(head, elm, field) do { \
|
|
typeof(elm) save_sle_next; \
|
|
do { \
|
|
save_sle_next = (elm)->field.sle_next = (head)->slh_first; \
|
|
} while (atomic_cmpxchg(&(head)->slh_first, save_sle_next, (elm)) != \
|
|
save_sle_next); \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QSLIST_MOVE_ATOMIC(dest, src) do { \
|
|
(dest)->slh_first = atomic_xchg(&(src)->slh_first, NULL); \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QSLIST_REMOVE_HEAD(head, field) do { \
|
|
(head)->slh_first = (head)->slh_first->field.sle_next; \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QSLIST_REMOVE_AFTER(slistelm, field) do { \
|
|
(slistelm)->field.sle_next = \
|
|
QSLIST_NEXT(QSLIST_NEXT((slistelm), field), field); \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QSLIST_FOREACH(var, head, field) \
|
|
for((var) = (head)->slh_first; (var); (var) = (var)->field.sle_next)
|
|
|
|
#define QSLIST_FOREACH_SAFE(var, head, field, tvar) \
|
|
for ((var) = QSLIST_FIRST((head)); \
|
|
(var) && ((tvar) = QSLIST_NEXT((var), field), 1); \
|
|
(var) = (tvar))
|
|
|
|
/*
|
|
* Singly-linked List access methods.
|
|
*/
|
|
#define QSLIST_EMPTY(head) ((head)->slh_first == NULL)
|
|
#define QSLIST_FIRST(head) ((head)->slh_first)
|
|
#define QSLIST_NEXT(elm, field) ((elm)->field.sle_next)
|
|
|
|
|
|
/*
|
|
* Simple queue definitions.
|
|
*/
|
|
#define QSIMPLEQ_HEAD(name, type) \
|
|
struct name { \
|
|
struct type *sqh_first; /* first element */ \
|
|
struct type **sqh_last; /* addr of last next element */ \
|
|
}
|
|
|
|
#define QSIMPLEQ_HEAD_INITIALIZER(head) \
|
|
{ NULL, &(head).sqh_first }
|
|
|
|
#define QSIMPLEQ_ENTRY(type) \
|
|
struct { \
|
|
struct type *sqe_next; /* next element */ \
|
|
}
|
|
|
|
/*
|
|
* Simple queue functions.
|
|
*/
|
|
#define QSIMPLEQ_INIT(head) do { \
|
|
(head)->sqh_first = NULL; \
|
|
(head)->sqh_last = &(head)->sqh_first; \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QSIMPLEQ_INSERT_HEAD(head, elm, field) do { \
|
|
if (((elm)->field.sqe_next = (head)->sqh_first) == NULL) \
|
|
(head)->sqh_last = &(elm)->field.sqe_next; \
|
|
(head)->sqh_first = (elm); \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QSIMPLEQ_INSERT_TAIL(head, elm, field) do { \
|
|
(elm)->field.sqe_next = NULL; \
|
|
*(head)->sqh_last = (elm); \
|
|
(head)->sqh_last = &(elm)->field.sqe_next; \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QSIMPLEQ_INSERT_AFTER(head, listelm, elm, field) do { \
|
|
if (((elm)->field.sqe_next = (listelm)->field.sqe_next) == NULL) \
|
|
(head)->sqh_last = &(elm)->field.sqe_next; \
|
|
(listelm)->field.sqe_next = (elm); \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QSIMPLEQ_REMOVE_HEAD(head, field) do { \
|
|
if (((head)->sqh_first = (head)->sqh_first->field.sqe_next) == NULL)\
|
|
(head)->sqh_last = &(head)->sqh_first; \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QSIMPLEQ_SPLIT_AFTER(head, elm, field, removed) do { \
|
|
QSIMPLEQ_INIT(removed); \
|
|
if (((removed)->sqh_first = (head)->sqh_first) != NULL) { \
|
|
if (((head)->sqh_first = (elm)->field.sqe_next) == NULL) { \
|
|
(head)->sqh_last = &(head)->sqh_first; \
|
|
} \
|
|
(removed)->sqh_last = &(elm)->field.sqe_next; \
|
|
(elm)->field.sqe_next = NULL; \
|
|
} \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QSIMPLEQ_REMOVE(head, elm, type, field) do { \
|
|
if ((head)->sqh_first == (elm)) { \
|
|
QSIMPLEQ_REMOVE_HEAD((head), field); \
|
|
} else { \
|
|
struct type *curelm = (head)->sqh_first; \
|
|
while (curelm->field.sqe_next != (elm)) \
|
|
curelm = curelm->field.sqe_next; \
|
|
if ((curelm->field.sqe_next = \
|
|
curelm->field.sqe_next->field.sqe_next) == NULL) \
|
|
(head)->sqh_last = &(curelm)->field.sqe_next; \
|
|
} \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QSIMPLEQ_FOREACH(var, head, field) \
|
|
for ((var) = ((head)->sqh_first); \
|
|
(var); \
|
|
(var) = ((var)->field.sqe_next))
|
|
|
|
#define QSIMPLEQ_FOREACH_SAFE(var, head, field, next) \
|
|
for ((var) = ((head)->sqh_first); \
|
|
(var) && ((next = ((var)->field.sqe_next)), 1); \
|
|
(var) = (next))
|
|
|
|
#define QSIMPLEQ_CONCAT(head1, head2) do { \
|
|
if (!QSIMPLEQ_EMPTY((head2))) { \
|
|
*(head1)->sqh_last = (head2)->sqh_first; \
|
|
(head1)->sqh_last = (head2)->sqh_last; \
|
|
QSIMPLEQ_INIT((head2)); \
|
|
} \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QSIMPLEQ_LAST(head, type, field) \
|
|
(QSIMPLEQ_EMPTY((head)) ? \
|
|
NULL : \
|
|
((struct type *)(void *) \
|
|
((char *)((head)->sqh_last) - offsetof(struct type, field))))
|
|
|
|
/*
|
|
* Simple queue access methods.
|
|
*/
|
|
#define QSIMPLEQ_EMPTY(head) ((head)->sqh_first == NULL)
|
|
#define QSIMPLEQ_FIRST(head) ((head)->sqh_first)
|
|
#define QSIMPLEQ_NEXT(elm, field) ((elm)->field.sqe_next)
|
|
|
|
|
|
/*
|
|
* Tail queue definitions.
|
|
*/
|
|
#define Q_TAILQ_HEAD(name, type, qual) \
|
|
struct name { \
|
|
qual type *tqh_first; /* first element */ \
|
|
qual type *qual *tqh_last; /* addr of last next element */ \
|
|
}
|
|
#define QTAILQ_HEAD(name, type) Q_TAILQ_HEAD(name, struct type,)
|
|
|
|
#define QTAILQ_HEAD_INITIALIZER(head) \
|
|
{ NULL, &(head).tqh_first }
|
|
|
|
#define Q_TAILQ_ENTRY(type, qual) \
|
|
struct { \
|
|
qual type *tqe_next; /* next element */ \
|
|
qual type *qual *tqe_prev; /* address of previous next element */\
|
|
}
|
|
#define QTAILQ_ENTRY(type) Q_TAILQ_ENTRY(struct type,)
|
|
|
|
/*
|
|
* Tail queue functions.
|
|
*/
|
|
#define QTAILQ_INIT(head) do { \
|
|
(head)->tqh_first = NULL; \
|
|
(head)->tqh_last = &(head)->tqh_first; \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QTAILQ_INSERT_HEAD(head, elm, field) do { \
|
|
if (((elm)->field.tqe_next = (head)->tqh_first) != NULL) \
|
|
(head)->tqh_first->field.tqe_prev = \
|
|
&(elm)->field.tqe_next; \
|
|
else \
|
|
(head)->tqh_last = &(elm)->field.tqe_next; \
|
|
(head)->tqh_first = (elm); \
|
|
(elm)->field.tqe_prev = &(head)->tqh_first; \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QTAILQ_INSERT_TAIL(head, elm, field) do { \
|
|
(elm)->field.tqe_next = NULL; \
|
|
(elm)->field.tqe_prev = (head)->tqh_last; \
|
|
*(head)->tqh_last = (elm); \
|
|
(head)->tqh_last = &(elm)->field.tqe_next; \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QTAILQ_INSERT_AFTER(head, listelm, elm, field) do { \
|
|
if (((elm)->field.tqe_next = (listelm)->field.tqe_next) != NULL)\
|
|
(elm)->field.tqe_next->field.tqe_prev = \
|
|
&(elm)->field.tqe_next; \
|
|
else \
|
|
(head)->tqh_last = &(elm)->field.tqe_next; \
|
|
(listelm)->field.tqe_next = (elm); \
|
|
(elm)->field.tqe_prev = &(listelm)->field.tqe_next; \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QTAILQ_INSERT_BEFORE(listelm, elm, field) do { \
|
|
(elm)->field.tqe_prev = (listelm)->field.tqe_prev; \
|
|
(elm)->field.tqe_next = (listelm); \
|
|
*(listelm)->field.tqe_prev = (elm); \
|
|
(listelm)->field.tqe_prev = &(elm)->field.tqe_next; \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QTAILQ_REMOVE(head, elm, field) do { \
|
|
if (((elm)->field.tqe_next) != NULL) \
|
|
(elm)->field.tqe_next->field.tqe_prev = \
|
|
(elm)->field.tqe_prev; \
|
|
else \
|
|
(head)->tqh_last = (elm)->field.tqe_prev; \
|
|
*(elm)->field.tqe_prev = (elm)->field.tqe_next; \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define QTAILQ_FOREACH(var, head, field) \
|
|
for ((var) = ((head)->tqh_first); \
|
|
(var); \
|
|
(var) = ((var)->field.tqe_next))
|
|
|
|
#define QTAILQ_FOREACH_SAFE(var, head, field, next_var) \
|
|
for ((var) = ((head)->tqh_first); \
|
|
(var) && ((next_var) = ((var)->field.tqe_next), 1); \
|
|
(var) = (next_var))
|
|
|
|
#define QTAILQ_FOREACH_REVERSE(var, head, headname, field) \
|
|
for ((var) = (*(((struct headname *)((head)->tqh_last))->tqh_last)); \
|
|
(var); \
|
|
(var) = (*(((struct headname *)((var)->field.tqe_prev))->tqh_last)))
|
|
|
|
/*
|
|
* Tail queue access methods.
|
|
*/
|
|
#define QTAILQ_EMPTY(head) ((head)->tqh_first == NULL)
|
|
#define QTAILQ_FIRST(head) ((head)->tqh_first)
|
|
#define QTAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
|
|
|
|
#define QTAILQ_LAST(head, headname) \
|
|
(*(((struct headname *)((head)->tqh_last))->tqh_last))
|
|
#define QTAILQ_PREV(elm, headname, field) \
|
|
(*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
|
|
|
|
#endif /* QEMU_SYS_QUEUE_H */
|