-/*
+/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* 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
+ * 4. 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.
*
* SUCH DAMAGE.
*
* @(#)queue.h 8.5 (Berkeley) 8/20/94
+ * $FreeBSD: src/sys/sys/queue.h,v 1.68 2006/10/24 11:20:29 ru Exp $
*/
-#ifndef _SYS_QUEUE_H_
+#ifndef _SYS_QUEUE_H_
#define _SYS_QUEUE_H_
+#include <sys/cdefs.h>
+
/*
- * This file defines five types of data structures: singly-linked lists,
- * lists, simple queues, tail queues, and circular queues.
+ * This file defines four types of data structures: singly-linked lists,
+ * singly-linked tail queues, lists 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 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 singly-linked 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
+ * 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, at the head of the list, or at the
+ * end of the list. Elements being removed from the head of the tail queue
+ * should use the explicit macro for this purpose for optimum efficiency.
+ * A singly-linked tail queue may only be traversed in the forward direction.
+ * Singly-linked tail queues are ideal for applications with large datasets
+ * and few or no removals or for implementing a FIFO 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
* 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
* 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.
*
- * A circle 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 circle queue may be traversed in either direction, but has a more
- * complex end of list detection.
- *
* For details on the use of these macros, see the queue(3) manual page.
+ *
+ *
+ * SLIST LIST STAILQ TAILQ
+ * _HEAD + + + +
+ * _HEAD_INITIALIZER + + + +
+ * _ENTRY + + + +
+ * _INIT + + + +
+ * _EMPTY + + + +
+ * _FIRST + + + +
+ * _NEXT + + + +
+ * _PREV - - - +
+ * _LAST - - + +
+ * _FOREACH + + + +
+ * _FOREACH_SAFE + + + +
+ * _FOREACH_REVERSE - - - +
+ * _FOREACH_REVERSE_SAFE - - - +
+ * _INSERT_HEAD + + + +
+ * _INSERT_BEFORE - + - +
+ * _INSERT_AFTER + + + +
+ * _INSERT_TAIL - - + +
+ * _CONCAT - - + +
+ * _REMOVE_HEAD + - + -
+ * _REMOVE + + + +
+ *
*/
+#ifdef QUEUE_MACRO_DEBUG
+/* Store the last 2 places the queue element or head was altered */
+struct qm_trace {
+ char * lastfile;
+ int lastline;
+ char * prevfile;
+ int prevline;
+};
+
+#define TRACEBUF struct qm_trace trace;
+#define TRASHIT(x) do {(x) = (void *)-1;} while (0)
+
+#define QMD_TRACE_HEAD(head) do { \
+ (head)->trace.prevline = (head)->trace.lastline; \
+ (head)->trace.prevfile = (head)->trace.lastfile; \
+ (head)->trace.lastline = __LINE__; \
+ (head)->trace.lastfile = __FILE__; \
+} while (0)
+
+#define QMD_TRACE_ELEM(elem) do { \
+ (elem)->trace.prevline = (elem)->trace.lastline; \
+ (elem)->trace.prevfile = (elem)->trace.lastfile; \
+ (elem)->trace.lastline = __LINE__; \
+ (elem)->trace.lastfile = __FILE__; \
+} while (0)
+
+#else
+#define QMD_TRACE_ELEM(elem)
+#define QMD_TRACE_HEAD(head)
+#define TRACEBUF
+#define TRASHIT(x)
+#endif /* QUEUE_MACRO_DEBUG */
/*
- * List definitions.
- */
-#define LIST_HEAD(name, type) \
-struct name { \
- struct type *lh_first; /* first element */ \
-}
-
-#define LIST_HEAD_INITIALIZER(head) \
- { NULL }
-
-#define LIST_ENTRY(type) \
-struct { \
- struct type *le_next; /* next element */ \
- struct type **le_prev; /* address of previous next element */ \
-}
-
-/*
- * List functions.
- */
-#define LIST_INIT(head) do { \
- (head)->lh_first = NULL; \
-} while (/*CONSTCOND*/0)
-
-#define LIST_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 LIST_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 LIST_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 LIST_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 LIST_FOREACH(var, head, field) \
- for ((var) = ((head)->lh_first); \
- (var); \
- (var) = ((var)->field.le_next))
-
-/*
- * List access methods.
- */
-#define LIST_EMPTY(head) ((head)->lh_first == NULL)
-#define LIST_FIRST(head) ((head)->lh_first)
-#define LIST_NEXT(elm, field) ((elm)->field.le_next)
-
-
-/*
- * Singly-linked List definitions.
+ * Singly-linked List declarations.
*/
#define SLIST_HEAD(name, type) \
struct name { \
/*
* Singly-linked List functions.
*/
+#define SLIST_EMPTY(head) ((head)->slh_first == NULL)
+
+#define SLIST_FIRST(head) ((head)->slh_first)
+
+#define SLIST_FOREACH(var, head, field) \
+ for ((var) = SLIST_FIRST((head)); \
+ (var); \
+ (var) = SLIST_NEXT((var), field))
+
+#define SLIST_FOREACH_SAFE(var, head, field, tvar) \
+ for ((var) = SLIST_FIRST((head)); \
+ (var) && ((tvar) = SLIST_NEXT((var), field), 1); \
+ (var) = (tvar))
+
+#define SLIST_FOREACH_PREVPTR(var, varp, head, field) \
+ for ((varp) = &SLIST_FIRST((head)); \
+ ((var) = *(varp)) != NULL; \
+ (varp) = &SLIST_NEXT((var), field))
+
#define SLIST_INIT(head) do { \
- (head)->slh_first = NULL; \
-} while (/*CONSTCOND*/0)
+ SLIST_FIRST((head)) = NULL; \
+} while (0)
#define SLIST_INSERT_AFTER(slistelm, elm, field) do { \
- (elm)->field.sle_next = (slistelm)->field.sle_next; \
- (slistelm)->field.sle_next = (elm); \
-} while (/*CONSTCOND*/0)
+ SLIST_NEXT((elm), field) = SLIST_NEXT((slistelm), field); \
+ SLIST_NEXT((slistelm), field) = (elm); \
+} while (0)
#define SLIST_INSERT_HEAD(head, elm, field) do { \
- (elm)->field.sle_next = (head)->slh_first; \
- (head)->slh_first = (elm); \
-} while (/*CONSTCOND*/0)
+ SLIST_NEXT((elm), field) = SLIST_FIRST((head)); \
+ SLIST_FIRST((head)) = (elm); \
+} while (0)
-#define SLIST_REMOVE_HEAD(head, field) do { \
- (head)->slh_first = (head)->slh_first->field.sle_next; \
-} while (/*CONSTCOND*/0)
+#define SLIST_NEXT(elm, field) ((elm)->field.sle_next)
#define SLIST_REMOVE(head, elm, type, field) do { \
- if ((head)->slh_first == (elm)) { \
+ if (SLIST_FIRST((head)) == (elm)) { \
SLIST_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; \
+ struct type *curelm = SLIST_FIRST((head)); \
+ while (SLIST_NEXT(curelm, field) != (elm)) \
+ curelm = SLIST_NEXT(curelm, field); \
+ SLIST_NEXT(curelm, field) = \
+ SLIST_NEXT(SLIST_NEXT(curelm, field), field); \
} \
-} while (/*CONSTCOND*/0)
-
-#define SLIST_FOREACH(var, head, field) \
- for((var) = (head)->slh_first; (var); (var) = (var)->field.sle_next)
-
-/*
- * Singly-linked List access methods.
- */
-#define SLIST_EMPTY(head) ((head)->slh_first == NULL)
-#define SLIST_FIRST(head) ((head)->slh_first)
-#define SLIST_NEXT(elm, field) ((elm)->field.sle_next)
+ TRASHIT((elm)->field.sle_next); \
+} while (0)
+#define SLIST_REMOVE_HEAD(head, field) do { \
+ SLIST_FIRST((head)) = SLIST_NEXT(SLIST_FIRST((head)), field); \
+} while (0)
/*
* Singly-linked Tail queue declarations.
*/
-#define STAILQ_HEAD(name, type) \
+#define STAILQ_HEAD(name, type) \
struct name { \
- struct type *stqh_first; /* first element */ \
- struct type **stqh_last; /* addr of last next element */ \
+ struct type *stqh_first;/* first element */ \
+ struct type **stqh_last;/* addr of last next element */ \
}
#define STAILQ_HEAD_INITIALIZER(head) \
/*
* Singly-linked Tail queue functions.
*/
+#define STAILQ_CONCAT(head1, head2) do { \
+ if (!STAILQ_EMPTY((head2))) { \
+ *(head1)->stqh_last = (head2)->stqh_first; \
+ (head1)->stqh_last = (head2)->stqh_last; \
+ STAILQ_INIT((head2)); \
+ } \
+} while (0)
+
+#define STAILQ_EMPTY(head) ((head)->stqh_first == NULL)
+
+#define STAILQ_FIRST(head) ((head)->stqh_first)
+
+#define STAILQ_FOREACH(var, head, field) \
+ for((var) = STAILQ_FIRST((head)); \
+ (var); \
+ (var) = STAILQ_NEXT((var), field))
+
+
+#define STAILQ_FOREACH_SAFE(var, head, field, tvar) \
+ for ((var) = STAILQ_FIRST((head)); \
+ (var) && ((tvar) = STAILQ_NEXT((var), field), 1); \
+ (var) = (tvar))
+
#define STAILQ_INIT(head) do { \
- (head)->stqh_first = NULL; \
- (head)->stqh_last = &(head)->stqh_first; \
-} while (/*CONSTCOND*/0)
+ STAILQ_FIRST((head)) = NULL; \
+ (head)->stqh_last = &STAILQ_FIRST((head)); \
+} while (0)
+
+#define STAILQ_INSERT_AFTER(head, tqelm, elm, field) do { \
+ if ((STAILQ_NEXT((elm), field) = STAILQ_NEXT((tqelm), field)) == NULL)\
+ (head)->stqh_last = &STAILQ_NEXT((elm), field); \
+ STAILQ_NEXT((tqelm), field) = (elm); \
+} while (0)
#define STAILQ_INSERT_HEAD(head, elm, field) do { \
- if (((elm)->field.stqe_next = (head)->stqh_first) == NULL) \
- (head)->stqh_last = &(elm)->field.stqe_next; \
- (head)->stqh_first = (elm); \
-} while (/*CONSTCOND*/0)
+ if ((STAILQ_NEXT((elm), field) = STAILQ_FIRST((head))) == NULL) \
+ (head)->stqh_last = &STAILQ_NEXT((elm), field); \
+ STAILQ_FIRST((head)) = (elm); \
+} while (0)
#define STAILQ_INSERT_TAIL(head, elm, field) do { \
- (elm)->field.stqe_next = NULL; \
+ STAILQ_NEXT((elm), field) = NULL; \
*(head)->stqh_last = (elm); \
- (head)->stqh_last = &(elm)->field.stqe_next; \
-} while (/*CONSTCOND*/0)
+ (head)->stqh_last = &STAILQ_NEXT((elm), field); \
+} while (0)
-#define STAILQ_INSERT_AFTER(head, listelm, elm, field) do { \
- if (((elm)->field.stqe_next = (listelm)->field.stqe_next) == NULL)\
- (head)->stqh_last = &(elm)->field.stqe_next; \
- (listelm)->field.stqe_next = (elm); \
-} while (/*CONSTCOND*/0)
+#define STAILQ_LAST(head, type, field) \
+ (STAILQ_EMPTY((head)) ? \
+ NULL : \
+ ((struct type *)(void *) \
+ ((char *)((head)->stqh_last) - __offsetof(struct type, field))))
-#define STAILQ_REMOVE_HEAD(head, field) do { \
- if (((head)->stqh_first = (head)->stqh_first->field.stqe_next) == NULL) \
- (head)->stqh_last = &(head)->stqh_first; \
-} while (/*CONSTCOND*/0)
+#define STAILQ_NEXT(elm, field) ((elm)->field.stqe_next)
#define STAILQ_REMOVE(head, elm, type, field) do { \
- if ((head)->stqh_first == (elm)) { \
+ if (STAILQ_FIRST((head)) == (elm)) { \
STAILQ_REMOVE_HEAD((head), field); \
- } else { \
- struct type *curelm = (head)->stqh_first; \
- while (curelm->field.stqe_next != (elm)) \
- curelm = curelm->field.stqe_next; \
- if ((curelm->field.stqe_next = \
- curelm->field.stqe_next->field.stqe_next) == NULL) \
- (head)->stqh_last = &(curelm)->field.stqe_next; \
} \
-} while (/*CONSTCOND*/0)
-
-#define STAILQ_FOREACH(var, head, field) \
- for ((var) = ((head)->stqh_first); \
- (var); \
- (var) = ((var)->field.stqe_next))
-
-/*
- * Singly-linked Tail queue access methods.
- */
-#define STAILQ_EMPTY(head) ((head)->stqh_first == NULL)
-#define STAILQ_FIRST(head) ((head)->stqh_first)
-#define STAILQ_NEXT(elm, field) ((elm)->field.stqe_next)
+ else { \
+ struct type *curelm = STAILQ_FIRST((head)); \
+ while (STAILQ_NEXT(curelm, field) != (elm)) \
+ curelm = STAILQ_NEXT(curelm, field); \
+ if ((STAILQ_NEXT(curelm, field) = \
+ STAILQ_NEXT(STAILQ_NEXT(curelm, field), field)) == NULL)\
+ (head)->stqh_last = &STAILQ_NEXT((curelm), field);\
+ } \
+ TRASHIT((elm)->field.stqe_next); \
+} while (0)
+#define STAILQ_REMOVE_HEAD(head, field) do { \
+ if ((STAILQ_FIRST((head)) = \
+ STAILQ_NEXT(STAILQ_FIRST((head)), field)) == NULL) \
+ (head)->stqh_last = &STAILQ_FIRST((head)); \
+} while (0)
/*
- * Simple queue definitions.
+ * List declarations.
*/
-#define SIMPLEQ_HEAD(name, type) \
+#define LIST_HEAD(name, type) \
struct name { \
- struct type *sqh_first; /* first element */ \
- struct type **sqh_last; /* addr of last next element */ \
+ struct type *lh_first; /* first element */ \
}
-#define SIMPLEQ_HEAD_INITIALIZER(head) \
- { NULL, &(head).sqh_first }
+#define LIST_HEAD_INITIALIZER(head) \
+ { NULL }
-#define SIMPLEQ_ENTRY(type) \
+#define LIST_ENTRY(type) \
struct { \
- struct type *sqe_next; /* next element */ \
+ struct type *le_next; /* next element */ \
+ struct type **le_prev; /* address of previous next element */ \
}
/*
- * Simple queue functions.
+ * List functions.
*/
-#define SIMPLEQ_INIT(head) do { \
- (head)->sqh_first = NULL; \
- (head)->sqh_last = &(head)->sqh_first; \
-} while (/*CONSTCOND*/0)
-
-#define SIMPLEQ_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 SIMPLEQ_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 SIMPLEQ_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 SIMPLEQ_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 SIMPLEQ_REMOVE(head, elm, type, field) do { \
- if ((head)->sqh_first == (elm)) { \
- SIMPLEQ_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 SIMPLEQ_FOREACH(var, head, field) \
- for ((var) = ((head)->sqh_first); \
- (var); \
- (var) = ((var)->field.sqe_next))
+#if (defined(_KERNEL) && defined(INVARIANTS))
+#define QMD_LIST_CHECK_HEAD(head, field) do { \
+ if (LIST_FIRST((head)) != NULL && \
+ LIST_FIRST((head))->field.le_prev != \
+ &LIST_FIRST((head))) \
+ panic("Bad list head %p first->prev != head", (head)); \
+} while (0)
+
+#define QMD_LIST_CHECK_NEXT(elm, field) do { \
+ if (LIST_NEXT((elm), field) != NULL && \
+ LIST_NEXT((elm), field)->field.le_prev != \
+ &((elm)->field.le_next)) \
+ panic("Bad link elm %p next->prev != elm", (elm)); \
+} while (0)
+
+#define QMD_LIST_CHECK_PREV(elm, field) do { \
+ if (*(elm)->field.le_prev != (elm)) \
+ panic("Bad link elm %p prev->next != elm", (elm)); \
+} while (0)
+#else
+#define QMD_LIST_CHECK_HEAD(head, field)
+#define QMD_LIST_CHECK_NEXT(elm, field)
+#define QMD_LIST_CHECK_PREV(elm, field)
+#endif /* (_KERNEL && INVARIANTS) */
+
+#define LIST_EMPTY(head) ((head)->lh_first == NULL)
+
+#define LIST_FIRST(head) ((head)->lh_first)
-/*
- * Simple queue access methods.
- */
-#define SIMPLEQ_EMPTY(head) ((head)->sqh_first == NULL)
-#define SIMPLEQ_FIRST(head) ((head)->sqh_first)
-#define SIMPLEQ_NEXT(elm, field) ((elm)->field.sqe_next)
+#define LIST_FOREACH(var, head, field) \
+ for ((var) = LIST_FIRST((head)); \
+ (var); \
+ (var) = LIST_NEXT((var), field))
+#define LIST_FOREACH_SAFE(var, head, field, tvar) \
+ for ((var) = LIST_FIRST((head)); \
+ (var) && ((tvar) = LIST_NEXT((var), field), 1); \
+ (var) = (tvar))
+
+#define LIST_INIT(head) do { \
+ LIST_FIRST((head)) = NULL; \
+} while (0)
+
+#define LIST_INSERT_AFTER(listelm, elm, field) do { \
+ QMD_LIST_CHECK_NEXT(listelm, field); \
+ 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)
+
+#define LIST_INSERT_BEFORE(listelm, elm, field) do { \
+ QMD_LIST_CHECK_PREV(listelm, field); \
+ (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)
+
+#define LIST_INSERT_HEAD(head, elm, field) do { \
+ QMD_LIST_CHECK_HEAD((head), field); \
+ 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)
+
+#define LIST_NEXT(elm, field) ((elm)->field.le_next)
+
+#define LIST_REMOVE(elm, field) do { \
+ QMD_LIST_CHECK_NEXT(elm, field); \
+ QMD_LIST_CHECK_PREV(elm, field); \
+ 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((elm)->field.le_next); \
+ TRASHIT((elm)->field.le_prev); \
+} while (0)
/*
- * Tail queue definitions.
+ * Tail queue declarations.
*/
-#define _TAILQ_HEAD(name, type, qual) \
+#define TAILQ_HEAD(name, type) \
struct name { \
- qual type *tqh_first; /* first element */ \
- qual type *qual *tqh_last; /* addr of last next element */ \
+ struct type *tqh_first; /* first element */ \
+ struct type **tqh_last; /* addr of last next element */ \
+ TRACEBUF \
}
-#define TAILQ_HEAD(name, type) _TAILQ_HEAD(name, struct type,)
#define TAILQ_HEAD_INITIALIZER(head) \
{ NULL, &(head).tqh_first }
-#define _TAILQ_ENTRY(type, qual) \
+#define TAILQ_ENTRY(type) \
struct { \
- qual type *tqe_next; /* next element */ \
- qual type *qual *tqe_prev; /* address of previous next element */\
+ struct type *tqe_next; /* next element */ \
+ struct type **tqe_prev; /* address of previous next element */ \
+ TRACEBUF \
}
-#define TAILQ_ENTRY(type) _TAILQ_ENTRY(struct type,)
/*
* Tail queue functions.
*/
+#if (defined(_KERNEL) && defined(INVARIANTS))
+#define QMD_TAILQ_CHECK_HEAD(head, field) do { \
+ if (!TAILQ_EMPTY(head) && \
+ TAILQ_FIRST((head))->field.tqe_prev != \
+ &TAILQ_FIRST((head))) \
+ panic("Bad tailq head %p first->prev != head", (head)); \
+} while (0)
+
+#define QMD_TAILQ_CHECK_TAIL(head, field) do { \
+ if (*(head)->tqh_last != NULL) \
+ panic("Bad tailq NEXT(%p->tqh_last) != NULL", (head)); \
+} while (0)
+
+#define QMD_TAILQ_CHECK_NEXT(elm, field) do { \
+ if (TAILQ_NEXT((elm), field) != NULL && \
+ TAILQ_NEXT((elm), field)->field.tqe_prev != \
+ &((elm)->field.tqe_next)) \
+ panic("Bad link elm %p next->prev != elm", (elm)); \
+} while (0)
+
+#define QMD_TAILQ_CHECK_PREV(elm, field) do { \
+ if (*(elm)->field.tqe_prev != (elm)) \
+ panic("Bad link elm %p prev->next != elm", (elm)); \
+} while (0)
+#else
+#define QMD_TAILQ_CHECK_HEAD(head, field)
+#define QMD_TAILQ_CHECK_TAIL(head, headname)
+#define QMD_TAILQ_CHECK_NEXT(elm, field)
+#define QMD_TAILQ_CHECK_PREV(elm, field)
+#endif /* (_KERNEL && INVARIANTS) */
+
+#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)
+
+#define TAILQ_EMPTY(head) ((head)->tqh_first == NULL)
+
+#define TAILQ_FIRST(head) ((head)->tqh_first)
+
+#define TAILQ_FOREACH(var, head, field) \
+ for ((var) = TAILQ_FIRST((head)); \
+ (var); \
+ (var) = TAILQ_NEXT((var), field))
+
+#define TAILQ_FOREACH_SAFE(var, head, field, tvar) \
+ for ((var) = TAILQ_FIRST((head)); \
+ (var) && ((tvar) = TAILQ_NEXT((var), field), 1); \
+ (var) = (tvar))
+
+#define TAILQ_FOREACH_REVERSE(var, head, headname, field) \
+ for ((var) = TAILQ_LAST((head), headname); \
+ (var); \
+ (var) = TAILQ_PREV((var), headname, field))
+
+#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))
+
#define TAILQ_INIT(head) do { \
- (head)->tqh_first = NULL; \
- (head)->tqh_last = &(head)->tqh_first; \
-} while (/*CONSTCOND*/0)
+ TAILQ_FIRST((head)) = NULL; \
+ (head)->tqh_last = &TAILQ_FIRST((head)); \
+ QMD_TRACE_HEAD(head); \
+} while (0)
+
+#define TAILQ_INSERT_AFTER(head, listelm, elm, field) do { \
+ QMD_TAILQ_CHECK_NEXT(listelm, field); \
+ 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)
+
+#define TAILQ_INSERT_BEFORE(listelm, elm, field) do { \
+ QMD_TAILQ_CHECK_PREV(listelm, field); \
+ (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)
#define TAILQ_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; \
+ QMD_TAILQ_CHECK_HEAD(head, field); \
+ if ((TAILQ_NEXT((elm), field) = TAILQ_FIRST((head))) != NULL) \
+ TAILQ_FIRST((head))->field.tqe_prev = \
+ &TAILQ_NEXT((elm), field); \
else \
- (head)->tqh_last = &(elm)->field.tqe_next; \
- (head)->tqh_first = (elm); \
- (elm)->field.tqe_prev = &(head)->tqh_first; \
-} while (/*CONSTCOND*/0)
+ (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)
#define TAILQ_INSERT_TAIL(head, elm, field) do { \
- (elm)->field.tqe_next = NULL; \
+ QMD_TAILQ_CHECK_TAIL(head, field); \
+ TAILQ_NEXT((elm), field) = NULL; \
(elm)->field.tqe_prev = (head)->tqh_last; \
*(head)->tqh_last = (elm); \
- (head)->tqh_last = &(elm)->field.tqe_next; \
-} while (/*CONSTCOND*/0)
+ (head)->tqh_last = &TAILQ_NEXT((elm), field); \
+ QMD_TRACE_HEAD(head); \
+ QMD_TRACE_ELEM(&(elm)->field); \
+} while (0)
-#define TAILQ_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 TAILQ_LAST(head, headname) \
+ (*(((struct headname *)((head)->tqh_last))->tqh_last))
-#define TAILQ_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 TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
+
+#define TAILQ_PREV(elm, headname, field) \
+ (*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
#define TAILQ_REMOVE(head, elm, field) do { \
- if (((elm)->field.tqe_next) != NULL) \
- (elm)->field.tqe_next->field.tqe_prev = \
+ QMD_TAILQ_CHECK_NEXT(elm, field); \
+ QMD_TAILQ_CHECK_PREV(elm, field); \
+ if ((TAILQ_NEXT((elm), field)) != NULL) \
+ TAILQ_NEXT((elm), field)->field.tqe_prev = \
(elm)->field.tqe_prev; \
- else \
+ else { \
(head)->tqh_last = (elm)->field.tqe_prev; \
- *(elm)->field.tqe_prev = (elm)->field.tqe_next; \
-} while (/*CONSTCOND*/0)
+ QMD_TRACE_HEAD(head); \
+ } \
+ *(elm)->field.tqe_prev = TAILQ_NEXT((elm), field); \
+ TRASHIT((elm)->field.tqe_next); \
+ TRASHIT((elm)->field.tqe_prev); \
+ QMD_TRACE_ELEM(&(elm)->field); \
+} while (0)
-#define TAILQ_FOREACH(var, head, field) \
- for ((var) = ((head)->tqh_first); \
- (var); \
- (var) = ((var)->field.tqe_next))
-#define TAILQ_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)))
+#ifdef _KERNEL
/*
- * Tail queue access methods.
+ * XXX insque() and remque() are an old way of handling certain queues.
+ * They bogusly assumes that all queue heads look alike.
*/
-#define TAILQ_EMPTY(head) ((head)->tqh_first == NULL)
-#define TAILQ_FIRST(head) ((head)->tqh_first)
-#define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
-#define TAILQ_LAST(head, headname) \
- (*(((struct headname *)((head)->tqh_last))->tqh_last))
-#define TAILQ_PREV(elm, headname, field) \
- (*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
+struct quehead {
+ struct quehead *qh_link;
+ struct quehead *qh_rlink;
+};
+#ifdef __CC_SUPPORTS___INLINE
-/*
- * Circular queue definitions.
- */
-#define CIRCLEQ_HEAD(name, type) \
-struct name { \
- struct type *cqh_first; /* first element */ \
- struct type *cqh_last; /* last element */ \
+static __inline void
+insque(void *a, void *b)
+{
+ struct quehead *element = (struct quehead *)a,
+ *head = (struct quehead *)b;
+
+ element->qh_link = head->qh_link;
+ element->qh_rlink = head;
+ head->qh_link = element;
+ element->qh_link->qh_rlink = element;
}
-#define CIRCLEQ_HEAD_INITIALIZER(head) \
- { (void *)&head, (void *)&head }
+static __inline void
+remque(void *a)
+{
+ struct quehead *element = (struct quehead *)a;
-#define CIRCLEQ_ENTRY(type) \
-struct { \
- struct type *cqe_next; /* next element */ \
- struct type *cqe_prev; /* previous element */ \
+ element->qh_link->qh_rlink = element->qh_rlink;
+ element->qh_rlink->qh_link = element->qh_link;
+ element->qh_rlink = 0;
}
-/*
- * Circular queue functions.
- */
-#define CIRCLEQ_INIT(head) do { \
- (head)->cqh_first = (void *)(head); \
- (head)->cqh_last = (void *)(head); \
-} while (/*CONSTCOND*/0)
-
-#define CIRCLEQ_INSERT_AFTER(head, listelm, elm, field) do { \
- (elm)->field.cqe_next = (listelm)->field.cqe_next; \
- (elm)->field.cqe_prev = (listelm); \
- if ((listelm)->field.cqe_next == (void *)(head)) \
- (head)->cqh_last = (elm); \
- else \
- (listelm)->field.cqe_next->field.cqe_prev = (elm); \
- (listelm)->field.cqe_next = (elm); \
-} while (/*CONSTCOND*/0)
-
-#define CIRCLEQ_INSERT_BEFORE(head, listelm, elm, field) do { \
- (elm)->field.cqe_next = (listelm); \
- (elm)->field.cqe_prev = (listelm)->field.cqe_prev; \
- if ((listelm)->field.cqe_prev == (void *)(head)) \
- (head)->cqh_first = (elm); \
- else \
- (listelm)->field.cqe_prev->field.cqe_next = (elm); \
- (listelm)->field.cqe_prev = (elm); \
-} while (/*CONSTCOND*/0)
-
-#define CIRCLEQ_INSERT_HEAD(head, elm, field) do { \
- (elm)->field.cqe_next = (head)->cqh_first; \
- (elm)->field.cqe_prev = (void *)(head); \
- if ((head)->cqh_last == (void *)(head)) \
- (head)->cqh_last = (elm); \
- else \
- (head)->cqh_first->field.cqe_prev = (elm); \
- (head)->cqh_first = (elm); \
-} while (/*CONSTCOND*/0)
-
-#define CIRCLEQ_INSERT_TAIL(head, elm, field) do { \
- (elm)->field.cqe_next = (void *)(head); \
- (elm)->field.cqe_prev = (head)->cqh_last; \
- if ((head)->cqh_first == (void *)(head)) \
- (head)->cqh_first = (elm); \
- else \
- (head)->cqh_last->field.cqe_next = (elm); \
- (head)->cqh_last = (elm); \
-} while (/*CONSTCOND*/0)
+#else /* !__CC_SUPPORTS___INLINE */
-#define CIRCLEQ_REMOVE(head, elm, field) do { \
- if ((elm)->field.cqe_next == (void *)(head)) \
- (head)->cqh_last = (elm)->field.cqe_prev; \
- else \
- (elm)->field.cqe_next->field.cqe_prev = \
- (elm)->field.cqe_prev; \
- if ((elm)->field.cqe_prev == (void *)(head)) \
- (head)->cqh_first = (elm)->field.cqe_next; \
- else \
- (elm)->field.cqe_prev->field.cqe_next = \
- (elm)->field.cqe_next; \
-} while (/*CONSTCOND*/0)
+void insque(void *a, void *b);
+void remque(void *a);
-#define CIRCLEQ_FOREACH(var, head, field) \
- for ((var) = ((head)->cqh_first); \
- (var) != (const void *)(head); \
- (var) = ((var)->field.cqe_next))
+#endif /* __CC_SUPPORTS___INLINE */
-#define CIRCLEQ_FOREACH_REVERSE(var, head, field) \
- for ((var) = ((head)->cqh_last); \
- (var) != (const void *)(head); \
- (var) = ((var)->field.cqe_prev))
+#endif /* _KERNEL */
-/*
- * Circular queue access methods.
- */
-#define CIRCLEQ_EMPTY(head) ((head)->cqh_first == (void *)(head))
-#define CIRCLEQ_FIRST(head) ((head)->cqh_first)
-#define CIRCLEQ_LAST(head) ((head)->cqh_last)
-#define CIRCLEQ_NEXT(elm, field) ((elm)->field.cqe_next)
-#define CIRCLEQ_PREV(elm, field) ((elm)->field.cqe_prev)
-
-#define CIRCLEQ_LOOP_NEXT(head, elm, field) \
- (((elm)->field.cqe_next == (void *)(head)) \
- ? ((head)->cqh_first) \
- : (elm->field.cqe_next))
-#define CIRCLEQ_LOOP_PREV(head, elm, field) \
- (((elm)->field.cqe_prev == (void *)(head)) \
- ? ((head)->cqh_last) \
- : (elm->field.cqe_prev))
-
-#endif /* sys/queue.h */
+#endif /* !_SYS_QUEUE_H_ */
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