Merge tag 'v2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[mv-sheeva.git] / include / linux / timerqueue.h

diff --git a/include/linux/timerqueue.h b/include/linux/timerqueue.h
new file mode 100644 (file)
index 0000000..d24aaba
--- /dev/null
+++ b/include/linux/timerqueue.h
@@ -0,0 +1,50 @@
+#ifndef _LINUX_TIMERQUEUE_H
+#define _LINUX_TIMERQUEUE_H
+
+#include <linux/rbtree.h>
+#include <linux/ktime.h>
+
+
+struct timerqueue_node {
+       struct rb_node node;
+       ktime_t expires;
+};
+
+struct timerqueue_head {
+       struct rb_root head;
+       struct timerqueue_node *next;
+};
+
+
+extern void timerqueue_add(struct timerqueue_head *head,
+                               struct timerqueue_node *node);
+extern void timerqueue_del(struct timerqueue_head *head,
+                               struct timerqueue_node *node);
+extern struct timerqueue_node *timerqueue_iterate_next(
+                                               struct timerqueue_node *node);
+
+/**
+ * timerqueue_getnext - Returns the timer with the earlies expiration time
+ *
+ * @head: head of timerqueue
+ *
+ * Returns a pointer to the timer node that has the
+ * earliest expiration time.
+ */
+static inline
+struct timerqueue_node *timerqueue_getnext(struct timerqueue_head *head)
+{
+       return head->next;
+}
+
+static inline void timerqueue_init(struct timerqueue_node *node)
+{
+       RB_CLEAR_NODE(&node->node);
+}
+
+static inline void timerqueue_init_head(struct timerqueue_head *head)
+{
+       head->head = RB_ROOT;
+       head->next = NULL;
+}
+#endif /* _LINUX_TIMERQUEUE_H */