Update <sys/queue.h>

Taken from FreeBSD.

1 files changed, 130 insertions, 61 deletions

diff --git a/include/bsd/queue.h b/include/bsd/queue.h
index e2dc909..f1f35c8 100644
--- a/include/bsd/queue.h
+++ b/include/bsd/queue.h
@@ -1,4 +1,4 @@
-/*
+/*-
  * Copyright (c) 1991, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
@@ -10,7 +10,7 @@
  * 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.
  *
@@ -27,11 +27,11 @@
  * SUCH DAMAGE.
  *
  *	@(#)queue.h	8.5 (Berkeley) 8/20/94
- * $FreeBSD: src/sys/sys/queue.h,v 1.58 2004/04/07 04:19:49 imp Exp $
+ * $FreeBSD$
  */
 
-#ifndef _SYS_QUEUE_H
-#define	_SYS_QUEUE_H
+#ifndef _SYS_QUEUE_H_
+#define	_SYS_QUEUE_H_
 
 #include <sys/cdefs.h>
 
@@ -96,12 +96,12 @@
  * _INSERT_AFTER		+	+	+	+
  * _INSERT_TAIL			-	-	+	+
  * _CONCAT			-	-	+	+
+ * _REMOVE_AFTER		+	-	+	-
  * _REMOVE_HEAD			+	-	+	-
  * _REMOVE			+	+	+	+
  *
  */
-#define	QUEUE_MACRO_DEBUG 0
-#if QUEUE_MACRO_DEBUG
+#ifdef QUEUE_MACRO_DEBUG
 /* Store the last 2 places the queue element or head was altered */
 struct qm_trace {
 	char * lastfile;
@@ -196,9 +196,14 @@ struct {								\
 		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);	\
+		SLIST_REMOVE_AFTER(curelm, field);			\
 	}								\
+	TRASHIT((elm)->field.sle_next);					\
+} while (0)
+
+#define SLIST_REMOVE_AFTER(elm, field) do {				\
+	SLIST_NEXT(elm, field) =					\
+	    SLIST_NEXT(SLIST_NEXT(elm, field), field);			\
 } while (0)
 
 #define	SLIST_REMOVE_HEAD(head, field) do {				\
@@ -287,10 +292,9 @@ struct {								\
 		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);\
+		STAILQ_REMOVE_AFTER(head, curelm, field);		\
 	}								\
+	TRASHIT((elm)->field.stqe_next);				\
 } while (0)
 
 #define	STAILQ_REMOVE_HEAD(head, field) do {				\
@@ -299,11 +303,26 @@ struct {								\
 		(head)->stqh_last = &STAILQ_FIRST((head));		\
 } while (0)
 
-#define	STAILQ_REMOVE_HEAD_UNTIL(head, elm, field) do {			\
-	if ((STAILQ_FIRST((head)) = STAILQ_NEXT((elm), field)) == NULL)	\
-		(head)->stqh_last = &STAILQ_FIRST((head));		\
+#define STAILQ_REMOVE_AFTER(head, elm, field) do {			\
+	if ((STAILQ_NEXT(elm, field) =					\
+	     STAILQ_NEXT(STAILQ_NEXT(elm, field), field)) == NULL)	\
+		(head)->stqh_last = &STAILQ_NEXT((elm), field);		\
+} while (0)
+
+#define STAILQ_SWAP(head1, head2, type) do {				\
+	struct type *swap_first = STAILQ_FIRST(head1);			\
+	struct type **swap_last = (head1)->stqh_last;			\
+	STAILQ_FIRST(head1) = STAILQ_FIRST(head2);			\
+	(head1)->stqh_last = (head2)->stqh_last;			\
+	STAILQ_FIRST(head2) = swap_first;				\
+	(head2)->stqh_last = swap_last;					\
+	if (STAILQ_EMPTY(head1))					\
+		(head1)->stqh_last = &STAILQ_FIRST(head1);		\
+	if (STAILQ_EMPTY(head2))					\
+		(head2)->stqh_last = &STAILQ_FIRST(head2);		\
 } while (0)
 
+
 /*
  * List declarations.
  */
@@ -325,6 +344,31 @@ struct {								\
  * List functions.
  */
 
+#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)
@@ -344,6 +388,7 @@ struct {								\
 } 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);				\
@@ -352,6 +397,7 @@ struct {								\
 } 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);				\
@@ -359,6 +405,7 @@ struct {								\
 } 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);					\
@@ -368,10 +415,24 @@ struct {								\
 #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)
+
+#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)
 
 /*
@@ -397,6 +458,37 @@ struct {								\
 /*
  * 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;		\
@@ -439,6 +531,7 @@ struct {								\
 } 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);				\
@@ -453,6 +546,7 @@ struct {								\
 } 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);				\
@@ -462,6 +556,7 @@ struct {								\
 } while (0)
 
 #define	TAILQ_INSERT_HEAD(head, elm, field) do {			\
+	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);				\
@@ -474,6 +569,7 @@ struct {								\
 } while (0)
 
 #define	TAILQ_INSERT_TAIL(head, elm, field) do {			\
+	QMD_TAILQ_CHECK_TAIL(head, field);				\
 	TAILQ_NEXT((elm), field) = NULL;				\
 	(elm)->field.tqe_prev = (head)->tqh_last;			\
 	*(head)->tqh_last = (elm);					\
@@ -491,6 +587,8 @@ struct {								\
 	(*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
 
 #define	TAILQ_REMOVE(head, elm, field) do {				\
+	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;				\
@@ -504,50 +602,21 @@ struct {								\
 	QMD_TRACE_ELEM(&(elm)->field);					\
 } while (0)
 
+#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)
 
-#ifdef _KERNEL
-
-/*
- * XXX insque() and remque() are an old way of handling certain queues.
- * They bogusly assumes that all queue heads look alike.
- */
-
-struct quehead {
-	struct quehead *qh_link;
-	struct quehead *qh_rlink;
-};
-
-#if defined(__GNUC__) || defined(__INTEL_COMPILER)
-
-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;
-}
-
-static __inline void
-remque(void *a)
-{
-	struct quehead *element = (struct quehead *)a;
-
-	element->qh_link->qh_rlink = element->qh_rlink;
-	element->qh_rlink->qh_link = element->qh_link;
-	element->qh_rlink = 0;
-}
-
-#else /* !(__GNUC__ || __INTEL_COMPILER) */
-
-void	insque(void *a, void *b);
-void	remque(void *a);
-
-#endif /* __GNUC__ || __INTEL_COMPILER */
-
-#endif /* _KERNEL */
-
-#endif /* !_SYS_QUEUE_H */
+#endif /* !_SYS_QUEUE_H_ */