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-rw-r--r--kern/queue.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/kern/queue.h b/kern/queue.h
index f0b4002..0080e78 100644
--- a/kern/queue.h
+++ b/kern/queue.h
@@ -321,6 +321,21 @@ void insque(queue_entry_t, queue_entry_t);
}
/*
+ * Macro: queue_replace
+ */
+#define queue_replace(head, to, from, type, field) \
+ { \
+ if ((head) == (from)->field.prev) \
+ (head)->next = (to); \
+ else \
+ ((type)((from)->field.prev))->field.next = (to); \
+ if ((head) == (from)->field.next) \
+ (head)->prev = (to); \
+ else \
+ ((type)((from)->field.next))->field.prev = (to); \
+}
+
+/*
* Macro: queue_assign
*/
#define queue_assign(to, from, type, field) \