| /* $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. |
| */ |
| |
| /* |
| * 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; \ |
| (elm)->field.le_next = NULL; \ |
| (elm)->field.le_prev = NULL; \ |
| } while (/*CONSTCOND*/0) |
| |
| /* |
| * Like QLIST_REMOVE() but safe to call when elm is not in a list |
| */ |
| #define QLIST_SAFE_REMOVE(elm, field) do { \ |
| if ((elm)->field.le_prev != NULL) { \ |
| 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; \ |
| (elm)->field.le_next = NULL; \ |
| (elm)->field.le_prev = NULL; \ |
| } \ |
| } while (/*CONSTCOND*/0) |
| |
| /* Is elm in a list? */ |
| #define QLIST_IS_INSERTED(elm, field) ((elm)->field.le_prev != NULL) |
| |
| #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 { \ |
| typeof((head)->slh_first) elm = (head)->slh_first; \ |
| (head)->slh_first = elm->field.sle_next; \ |
| elm->field.sle_next = NULL; \ |
| } while (/*CONSTCOND*/0) |
| |
| #define QSLIST_REMOVE_AFTER(slistelm, field) do { \ |
| typeof(slistelm) next = (slistelm)->field.sle_next; \ |
| (slistelm)->field.sle_next = next->field.sle_next; \ |
| next->field.sle_next = NULL; \ |
| } while (/*CONSTCOND*/0) |
| |
| #define QSLIST_REMOVE(head, elm, type, field) do { \ |
| if ((head)->slh_first == (elm)) { \ |
| QSLIST_REMOVE_HEAD((head), field); \ |
| } else { \ |
| struct type *curelm = (head)->slh_first; \ |
| while (curelm->field.sle_next != (elm)) \ |
| curelm = curelm->field.sle_next; \ |
| curelm->field.sle_next = curelm->field.sle_next->field.sle_next; \ |
| (elm)->field.sle_next = NULL; \ |
| } \ |
| } 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 { \ |
| typeof((head)->sqh_first) elm = (head)->sqh_first; \ |
| if (((head)->sqh_first = elm->field.sqe_next) == NULL) \ |
| (head)->sqh_last = &(head)->sqh_first; \ |
| elm->field.sqe_next = NULL; \ |
| } 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; \ |
| (elm)->field.sqe_next = NULL; \ |
| } \ |
| } 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_PREPEND(head1, head2) do { \ |
| if (!QSIMPLEQ_EMPTY((head2))) { \ |
| *(head2)->sqh_last = (head1)->sqh_first; \ |
| (head1)->sqh_first = (head2)->sqh_first; \ |
| 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_ATOMIC(head) (atomic_read(&((head)->sqh_first)) == NULL) |
| #define QSIMPLEQ_EMPTY(head) ((head)->sqh_first == NULL) |
| #define QSIMPLEQ_FIRST(head) ((head)->sqh_first) |
| #define QSIMPLEQ_NEXT(elm, field) ((elm)->field.sqe_next) |
| |
| typedef struct QTailQLink { |
| void *tql_next; |
| struct QTailQLink *tql_prev; |
| } QTailQLink; |
| |
| /* |
| * Tail queue definitions. The union acts as a poor man template, as if |
| * it were QTailQLink<type>. |
| */ |
| #define QTAILQ_HEAD(name, type) \ |
| union name { \ |
| struct type *tqh_first; /* first element */ \ |
| QTailQLink tqh_circ; /* link for circular backwards list */ \ |
| } |
| |
| #define QTAILQ_HEAD_INITIALIZER(head) \ |
| { .tqh_circ = { NULL, &(head).tqh_circ } } |
| |
| #define QTAILQ_ENTRY(type) \ |
| union { \ |
| struct type *tqe_next; /* next element */ \ |
| QTailQLink tqe_circ; /* link for circular backwards list */ \ |
| } |
| |
| /* |
| * Tail queue functions. |
| */ |
| #define QTAILQ_INIT(head) do { \ |
| (head)->tqh_first = NULL; \ |
| (head)->tqh_circ.tql_prev = &(head)->tqh_circ; \ |
| } 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_circ.tql_prev = \ |
| &(elm)->field.tqe_circ; \ |
| else \ |
| (head)->tqh_circ.tql_prev = &(elm)->field.tqe_circ; \ |
| (head)->tqh_first = (elm); \ |
| (elm)->field.tqe_circ.tql_prev = &(head)->tqh_circ; \ |
| } while (/*CONSTCOND*/0) |
| |
| #define QTAILQ_INSERT_TAIL(head, elm, field) do { \ |
| (elm)->field.tqe_next = NULL; \ |
| (elm)->field.tqe_circ.tql_prev = (head)->tqh_circ.tql_prev; \ |
| (head)->tqh_circ.tql_prev->tql_next = (elm); \ |
| (head)->tqh_circ.tql_prev = &(elm)->field.tqe_circ; \ |
| } 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_circ.tql_prev = \ |
| &(elm)->field.tqe_circ; \ |
| else \ |
| (head)->tqh_circ.tql_prev = &(elm)->field.tqe_circ; \ |
| (listelm)->field.tqe_next = (elm); \ |
| (elm)->field.tqe_circ.tql_prev = &(listelm)->field.tqe_circ; \ |
| } while (/*CONSTCOND*/0) |
| |
| #define QTAILQ_INSERT_BEFORE(listelm, elm, field) do { \ |
| (elm)->field.tqe_circ.tql_prev = (listelm)->field.tqe_circ.tql_prev; \ |
| (elm)->field.tqe_next = (listelm); \ |
| (listelm)->field.tqe_circ.tql_prev->tql_next = (elm); \ |
| (listelm)->field.tqe_circ.tql_prev = &(elm)->field.tqe_circ; \ |
| } while (/*CONSTCOND*/0) |
| |
| #define QTAILQ_REMOVE(head, elm, field) do { \ |
| if (((elm)->field.tqe_next) != NULL) \ |
| (elm)->field.tqe_next->field.tqe_circ.tql_prev = \ |
| (elm)->field.tqe_circ.tql_prev; \ |
| else \ |
| (head)->tqh_circ.tql_prev = (elm)->field.tqe_circ.tql_prev; \ |
| (elm)->field.tqe_circ.tql_prev->tql_next = (elm)->field.tqe_next; \ |
| (elm)->field.tqe_circ.tql_prev = NULL; \ |
| (elm)->field.tqe_circ.tql_next = NULL; \ |
| (elm)->field.tqe_next = NULL; \ |
| } while (/*CONSTCOND*/0) |
| |
| /* remove @left, @right and all elements in between from @head */ |
| #define QTAILQ_REMOVE_SEVERAL(head, left, right, field) do { \ |
| if (((right)->field.tqe_next) != NULL) \ |
| (right)->field.tqe_next->field.tqe_circ.tql_prev = \ |
| (left)->field.tqe_circ.tql_prev; \ |
| else \ |
| (head)->tqh_circ.tql_prev = (left)->field.tqe_circ.tql_prev; \ |
| (left)->field.tqe_circ.tql_prev->tql_next = (right)->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, field) \ |
| for ((var) = QTAILQ_LAST(head); \ |
| (var); \ |
| (var) = QTAILQ_PREV(var, field)) |
| |
| #define QTAILQ_FOREACH_REVERSE_SAFE(var, head, field, prev_var) \ |
| for ((var) = QTAILQ_LAST(head); \ |
| (var) && ((prev_var) = QTAILQ_PREV(var, field), 1); \ |
| (var) = (prev_var)) |
| |
| /* |
| * 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_IN_USE(elm, field) ((elm)->field.tqe_circ.tql_prev != NULL) |
| |
| #define QTAILQ_LINK_PREV(link) \ |
| ((link).tql_prev->tql_prev->tql_next) |
| #define QTAILQ_LAST(head) \ |
| ((typeof((head)->tqh_first)) QTAILQ_LINK_PREV((head)->tqh_circ)) |
| #define QTAILQ_PREV(elm, field) \ |
| ((typeof((elm)->field.tqe_next)) QTAILQ_LINK_PREV((elm)->field.tqe_circ)) |
| |
| #define field_at_offset(base, offset, type) \ |
| ((type *) (((char *) (base)) + (offset))) |
| |
| /* |
| * Raw access of elements of a tail queue head. Offsets are all zero |
| * because it's a union. |
| */ |
| #define QTAILQ_RAW_FIRST(head) \ |
| field_at_offset(head, 0, void *) |
| #define QTAILQ_RAW_TQH_CIRC(head) \ |
| field_at_offset(head, 0, QTailQLink) |
| |
| /* |
| * Raw access of elements of a tail entry |
| */ |
| #define QTAILQ_RAW_NEXT(elm, entry) \ |
| field_at_offset(elm, entry, void *) |
| #define QTAILQ_RAW_TQE_CIRC(elm, entry) \ |
| field_at_offset(elm, entry, QTailQLink) |
| /* |
| * Tail queue traversal using pointer arithmetic. |
| */ |
| #define QTAILQ_RAW_FOREACH(elm, head, entry) \ |
| for ((elm) = *QTAILQ_RAW_FIRST(head); \ |
| (elm); \ |
| (elm) = *QTAILQ_RAW_NEXT(elm, entry)) |
| /* |
| * Tail queue insertion using pointer arithmetic. |
| */ |
| #define QTAILQ_RAW_INSERT_TAIL(head, elm, entry) do { \ |
| *QTAILQ_RAW_NEXT(elm, entry) = NULL; \ |
| QTAILQ_RAW_TQE_CIRC(elm, entry)->tql_prev = QTAILQ_RAW_TQH_CIRC(head)->tql_prev; \ |
| QTAILQ_RAW_TQH_CIRC(head)->tql_prev->tql_next = (elm); \ |
| QTAILQ_RAW_TQH_CIRC(head)->tql_prev = QTAILQ_RAW_TQE_CIRC(elm, entry); \ |
| } while (/*CONSTCOND*/0) |
| |
| #define QLIST_RAW_FIRST(head) \ |
| field_at_offset(head, 0, void *) |
| |
| #define QLIST_RAW_NEXT(elm, entry) \ |
| field_at_offset(elm, entry, void *) |
| |
| #define QLIST_RAW_PREVIOUS(elm, entry) \ |
| field_at_offset(elm, entry + sizeof(void *), void *) |
| |
| #define QLIST_RAW_FOREACH(elm, head, entry) \ |
| for ((elm) = *QLIST_RAW_FIRST(head); \ |
| (elm); \ |
| (elm) = *QLIST_RAW_NEXT(elm, entry)) |
| |
| #define QLIST_RAW_INSERT_AFTER(head, prev, elem, entry) do { \ |
| *QLIST_RAW_NEXT(prev, entry) = elem; \ |
| *QLIST_RAW_PREVIOUS(elem, entry) = QLIST_RAW_NEXT(prev, entry); \ |
| *QLIST_RAW_NEXT(elem, entry) = NULL; \ |
| } while (0) |
| |
| #define QLIST_RAW_INSERT_HEAD(head, elm, entry) do { \ |
| void *first = *QLIST_RAW_FIRST(head); \ |
| *QLIST_RAW_FIRST(head) = elm; \ |
| *QLIST_RAW_PREVIOUS(elm, entry) = QLIST_RAW_FIRST(head); \ |
| if (first) { \ |
| *QLIST_RAW_NEXT(elm, entry) = first; \ |
| *QLIST_RAW_PREVIOUS(first, entry) = QLIST_RAW_NEXT(elm, entry); \ |
| } else { \ |
| *QLIST_RAW_NEXT(elm, entry) = NULL; \ |
| } \ |
| } while (0) |
| |
| #endif /* QEMU_SYS_QUEUE_H */ |
