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Patch: glibc-2.3.5-obsd-alt-sys-queue.patch
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# Backport sys/queue.h from OpenBSD.
--- glibc-2.3.5/misc/sys/queue.h.orig 1999-06-08 21:03:17 +0000
+++ glibc-2.3.5/misc/sys/queue.h 2004-04-08 12:08:21 +0000
@@ -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.
- * 4. Neither the name of the University nor the names of its contributors
+ * 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.
*
@@ -26,29 +26,47 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
- * @(#)queue.h 8.3 (Berkeley) 12/13/93
+ * @(#)queue.h 8.5 (Berkeley) 8/20/94
*/
-#ifndef _SYS_QUEUE_H
-#define _SYS_QUEUE_H 1
+#ifndef _SYS_QUEUE_H_
+#define _SYS_QUEUE_H_
/*
- * This file defines three types of data structures: lists, tail queues,
- * and circular queues.
+ * This file defines five types of data structures: singly-linked lists,
+ * lists, simple queues, tail queues, and circular 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 after
- * an existing element or at the head of the list. A list may only be
- * traversed in the forward direction.
+ * 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 before or 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 after
- * an existing element, at the head of the list, or at the end of the
- * list. A tail queue may only be traversed in the forward direction.
+ * 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.
*
* 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
@@ -62,6 +80,78 @@
*/
/*
+ * Singly-linked List definitions.
+ */
+#define SLIST_HEAD(name, type) \
+struct name { \+ struct type *slh_first; /* first element */ \
+}
+
+#define SLIST_HEAD_INITIALIZER(head) \
+ { NULL }+
+#define SLIST_ENTRY(type) \
+struct { \+ struct type *sle_next; /* next element */ \
+}
+
+/*
+ * Singly-linked List access methods.
+ */
+#define SLIST_FIRST(head) ((head)->slh_first)
+#define SLIST_END(head) NULL
+#define SLIST_EMPTY(head) (SLIST_FIRST(head) == SLIST_END(head))
+#define SLIST_NEXT(elm, field) ((elm)->field.sle_next)
+
+#define SLIST_FOREACH(var, head, field) \
+ for((var) = SLIST_FIRST(head); \
+ (var) != SLIST_END(head); \
+ (var) = SLIST_NEXT(var, field))
+
+#define SLIST_FOREACH_PREVPTR(var, varp, head, field) \
+ for ((varp) = &SLIST_FIRST((head)); \
+ ((var) = *(varp)) != SLIST_END(head); \
+ (varp) = &SLIST_NEXT((var), field))
+
+/*
+ * Singly-linked List functions.
+ */
+#define SLIST_INIT(head) { \+ SLIST_FIRST(head) = SLIST_END(head); \
+}
+
+#define SLIST_INSERT_AFTER(slistelm, elm, field) do { \+ (elm)->field.sle_next = (slistelm)->field.sle_next; \
+ (slistelm)->field.sle_next = (elm); \
+} while (0)
+
+#define SLIST_INSERT_HEAD(head, elm, field) do { \+ (elm)->field.sle_next = (head)->slh_first; \
+ (head)->slh_first = (elm); \
+} while (0)
+
+#define SLIST_REMOVE_NEXT(head, elm, field) do { \+ (elm)->field.sle_next = (elm)->field.sle_next->field.sle_next; \
+} while (0)
+
+#define SLIST_REMOVE_HEAD(head, field) do { \+ (head)->slh_first = (head)->slh_first->field.sle_next; \
+} while (0)
+
+#define SLIST_REMOVE(head, elm, type, field) do { \+ if ((head)->slh_first == (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; \
+ } \
+} while (0)
+
+/*
* List definitions.
*/
#define LIST_HEAD(name, type) \
@@ -69,6 +159,9 @@ 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 */ \
@@ -76,35 +169,124 @@ struct { \}
/*
+ * List access methods
+ */
+#define LIST_FIRST(head) ((head)->lh_first)
+#define LIST_END(head) NULL
+#define LIST_EMPTY(head) (LIST_FIRST(head) == LIST_END(head))
+#define LIST_NEXT(elm, field) ((elm)->field.le_next)
+
+#define LIST_FOREACH(var, head, field) \
+ for((var) = LIST_FIRST(head); \
+ (var)!= LIST_END(head); \
+ (var) = LIST_NEXT(var, field))
+
+/*
* List functions.
*/
-#define LIST_INIT(head) { \- (head)->lh_first = NULL; \
-}
+#define LIST_INIT(head) do { \+ LIST_FIRST(head) = LIST_END(head); \
+} while (0)
-#define LIST_INSERT_AFTER(listelm, elm, field) { \+#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 (0)
-#define LIST_INSERT_HEAD(head, elm, field) { \+#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 (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 (0)
-#define LIST_REMOVE(elm, field) { \+#define LIST_REMOVE(elm, field) do { \if ((elm)->field.le_next != NULL) \
- (elm)->field.le_next->field.le_prev = \
+ (elm)->field.le_next->field.le_prev = \
(elm)->field.le_prev; \
*(elm)->field.le_prev = (elm)->field.le_next; \
+} while (0)
+
+#define LIST_REPLACE(elm, elm2, field) do { \+ if (((elm2)->field.le_next = (elm)->field.le_next) != NULL) \
+ (elm2)->field.le_next->field.le_prev = \
+ &(elm2)->field.le_next; \
+ (elm2)->field.le_prev = (elm)->field.le_prev; \
+ *(elm2)->field.le_prev = (elm2); \
+} while (0)
+
+/*
+ * Simple queue definitions.
+ */
+#define SIMPLEQ_HEAD(name, type) \
+struct name { \+ struct type *sqh_first; /* first element */ \
+ struct type **sqh_last; /* addr of last next element */ \
+}
+
+#define SIMPLEQ_HEAD_INITIALIZER(head) \
+ { NULL, &(head).sqh_first }+
+#define SIMPLEQ_ENTRY(type) \
+struct { \+ struct type *sqe_next; /* next element */ \
}
/*
+ * Simple queue access methods.
+ */
+#define SIMPLEQ_FIRST(head) ((head)->sqh_first)
+#define SIMPLEQ_END(head) NULL
+#define SIMPLEQ_EMPTY(head) (SIMPLEQ_FIRST(head) == SIMPLEQ_END(head))
+#define SIMPLEQ_NEXT(elm, field) ((elm)->field.sqe_next)
+
+#define SIMPLEQ_FOREACH(var, head, field) \
+ for((var) = SIMPLEQ_FIRST(head); \
+ (var) != SIMPLEQ_END(head); \
+ (var) = SIMPLEQ_NEXT(var, field))
+
+/*
+ * Simple queue functions.
+ */
+#define SIMPLEQ_INIT(head) do { \+ (head)->sqh_first = NULL; \
+ (head)->sqh_last = &(head)->sqh_first; \
+} while (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 (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 (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 (0)
+
+#define SIMPLEQ_REMOVE_HEAD(head, elm, field) do { \+ if (((head)->sqh_first = (elm)->field.sqe_next) == NULL) \
+ (head)->sqh_last = &(head)->sqh_first; \
+} while (0)
+
+/*
* Tail queue definitions.
*/
#define TAILQ_HEAD(name, type) \
@@ -113,55 +295,99 @@ struct name { \struct type **tqh_last; /* addr of last next element */ \
}
+#define TAILQ_HEAD_INITIALIZER(head) \
+ { NULL, &(head).tqh_first }+
#define TAILQ_ENTRY(type) \
struct { \struct type *tqe_next; /* next element */ \
struct type **tqe_prev; /* address of previous next element */ \
}
+/*
+ * tail queue access methods
+ */
+#define TAILQ_FIRST(head) ((head)->tqh_first)
+#define TAILQ_END(head) NULL
+#define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
+#define TAILQ_LAST(head, headname) \
+ (*(((struct headname *)((head)->tqh_last))->tqh_last))
+/* XXX */
+#define TAILQ_PREV(elm, headname, field) \
+ (*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
+#define TAILQ_EMPTY(head) \
+ (TAILQ_FIRST(head) == TAILQ_END(head))
+
+#define TAILQ_FOREACH(var, head, field) \
+ for((var) = TAILQ_FIRST(head); \
+ (var) != TAILQ_END(head); \
+ (var) = TAILQ_NEXT(var, field))
+
+#define TAILQ_FOREACH_REVERSE(var, head, headname, field) \
+ for((var) = TAILQ_LAST(head, headname); \
+ (var) != TAILQ_END(head); \
+ (var) = TAILQ_PREV(var, headname, field))
+
/*
* Tail queue functions.
*/
-#define TAILQ_INIT(head) { \+#define TAILQ_INIT(head) do { \(head)->tqh_first = NULL; \
(head)->tqh_last = &(head)->tqh_first; \
-}
+} while (0)
-#define TAILQ_INSERT_HEAD(head, elm, field) { \+#define TAILQ_INSERT_HEAD(head, elm, field) do { \if (((elm)->field.tqe_next = (head)->tqh_first) != NULL) \
- (elm)->field.tqe_next->field.tqe_prev = \
+ (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 (0)
-#define TAILQ_INSERT_TAIL(head, elm, field) { \+#define TAILQ_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 (0)
-#define TAILQ_INSERT_AFTER(head, listelm, elm, field) { \+#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->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 (0)
-#define TAILQ_REMOVE(head, elm, field) { \+#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 (0)
+
+#define TAILQ_REMOVE(head, elm, field) do { \if (((elm)->field.tqe_next) != NULL) \
- (elm)->field.tqe_next->field.tqe_prev = \
+ (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 (0)
+
+#define TAILQ_REPLACE(head, elm, elm2, field) do { \+ if (((elm2)->field.tqe_next = (elm)->field.tqe_next) != NULL) \
+ (elm2)->field.tqe_next->field.tqe_prev = \
+ &(elm2)->field.tqe_next; \
+ else \
+ (head)->tqh_last = &(elm2)->field.tqe_next; \
+ (elm2)->field.tqe_prev = (elm)->field.tqe_prev; \
+ *(elm2)->field.tqe_prev = (elm2); \
+} while (0)
/*
* Circular queue definitions.
@@ -172,6 +398,9 @@ struct name { \struct type *cqh_last; /* last element */ \
}
+#define CIRCLEQ_HEAD_INITIALIZER(head) \
+ { CIRCLEQ_END(&head), CIRCLEQ_END(&head) }+
#define CIRCLEQ_ENTRY(type) \
struct { \struct type *cqe_next; /* next element */ \
@@ -179,63 +408,98 @@ struct { \}
/*
+ * Circular queue access methods
+ */
+#define CIRCLEQ_FIRST(head) ((head)->cqh_first)
+#define CIRCLEQ_LAST(head) ((head)->cqh_last)
+#define CIRCLEQ_END(head) ((void *)(head))
+#define CIRCLEQ_NEXT(elm, field) ((elm)->field.cqe_next)
+#define CIRCLEQ_PREV(elm, field) ((elm)->field.cqe_prev)
+#define CIRCLEQ_EMPTY(head) \
+ (CIRCLEQ_FIRST(head) == CIRCLEQ_END(head))
+
+#define CIRCLEQ_FOREACH(var, head, field) \
+ for((var) = CIRCLEQ_FIRST(head); \
+ (var) != CIRCLEQ_END(head); \
+ (var) = CIRCLEQ_NEXT(var, field))
+
+#define CIRCLEQ_FOREACH_REVERSE(var, head, field) \
+ for((var) = CIRCLEQ_LAST(head); \
+ (var) != CIRCLEQ_END(head); \
+ (var) = CIRCLEQ_PREV(var, field))
+
+/*
* Circular queue functions.
*/
-#define CIRCLEQ_INIT(head) { \- (head)->cqh_first = (void *)(head); \
- (head)->cqh_last = (void *)(head); \
-}
+#define CIRCLEQ_INIT(head) do { \+ (head)->cqh_first = CIRCLEQ_END(head); \
+ (head)->cqh_last = CIRCLEQ_END(head); \
+} while (0)
-#define CIRCLEQ_INSERT_AFTER(head, listelm, elm, field) { \+#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)) \
+ if ((listelm)->field.cqe_next == CIRCLEQ_END(head)) \
(head)->cqh_last = (elm); \
else \
(listelm)->field.cqe_next->field.cqe_prev = (elm); \
(listelm)->field.cqe_next = (elm); \
-}
+} while (0)
-#define CIRCLEQ_INSERT_BEFORE(head, listelm, elm, field) { \+#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)) \
+ if ((listelm)->field.cqe_prev == CIRCLEQ_END(head)) \
(head)->cqh_first = (elm); \
else \
(listelm)->field.cqe_prev->field.cqe_next = (elm); \
(listelm)->field.cqe_prev = (elm); \
-}
+} while (0)
-#define CIRCLEQ_INSERT_HEAD(head, elm, field) { \+#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)) \
+ (elm)->field.cqe_prev = CIRCLEQ_END(head); \
+ if ((head)->cqh_last == CIRCLEQ_END(head)) \
(head)->cqh_last = (elm); \
else \
(head)->cqh_first->field.cqe_prev = (elm); \
(head)->cqh_first = (elm); \
-}
+} while (0)
-#define CIRCLEQ_INSERT_TAIL(head, elm, field) { \- (elm)->field.cqe_next = (void *)(head); \
+#define CIRCLEQ_INSERT_TAIL(head, elm, field) do { \+ (elm)->field.cqe_next = CIRCLEQ_END(head); \
(elm)->field.cqe_prev = (head)->cqh_last; \
- if ((head)->cqh_first == (void *)(head)) \
+ if ((head)->cqh_first == CIRCLEQ_END(head)) \
(head)->cqh_first = (elm); \
else \
(head)->cqh_last->field.cqe_next = (elm); \
(head)->cqh_last = (elm); \
-}
+} while (0)
-#define CIRCLEQ_REMOVE(head, elm, field) { \- if ((elm)->field.cqe_next == (void *)(head)) \
+#define CIRCLEQ_REMOVE(head, elm, field) do { \+ if ((elm)->field.cqe_next == CIRCLEQ_END(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)) \
+ if ((elm)->field.cqe_prev == CIRCLEQ_END(head)) \
(head)->cqh_first = (elm)->field.cqe_next; \
else \
(elm)->field.cqe_prev->field.cqe_next = \
(elm)->field.cqe_next; \
-}
-#endif /* sys/queue.h */
+} while (0)
+
+#define CIRCLEQ_REPLACE(head, elm, elm2, field) do { \+ if (((elm2)->field.cqe_next = (elm)->field.cqe_next) == \
+ CIRCLEQ_END(head)) \
+ (head).cqh_last = (elm2); \
+ else \
+ (elm2)->field.cqe_next->field.cqe_prev = (elm2); \
+ if (((elm2)->field.cqe_prev = (elm)->field.cqe_prev) == \
+ CIRCLEQ_END(head)) \
+ (head).cqh_first = (elm2); \
+ else \
+ (elm2)->field.cqe_prev->field.cqe_next = (elm2); \
+} while (0)
+
+#endif /* !_SYS_QUEUE_H_ */