1 #ifndef _LINUX_TIMERQUEUE_H
2 #define _LINUX_TIMERQUEUE_H
3 
4 #include <linux/rbtree.h>
5 #include <linux/ktime.h>
6 
7 
8 struct timerqueue_node {
9 	struct rb_node node;
10 	ktime_t expires;
11 };
12 
13 struct timerqueue_head {
14 	struct rb_root head;
15 	struct timerqueue_node *next;
16 };
17 
18 
19 extern void timerqueue_add(struct timerqueue_head *head,
20 				struct timerqueue_node *node);
21 extern void timerqueue_del(struct timerqueue_head *head,
22 				struct timerqueue_node *node);
23 extern struct timerqueue_node *timerqueue_iterate_next(
24 						struct timerqueue_node *node);
25 
26 /**
27  * timerqueue_getnext - Returns the timer with the earliest expiration time
28  *
29  * @head: head of timerqueue
30  *
31  * Returns a pointer to the timer node that has the
32  * earliest expiration time.
33  */
34 static inline
timerqueue_getnext(struct timerqueue_head * head)35 struct timerqueue_node *timerqueue_getnext(struct timerqueue_head *head)
36 {
37 	return head->next;
38 }
39 
timerqueue_init(struct timerqueue_node * node)40 static inline void timerqueue_init(struct timerqueue_node *node)
41 {
42 	RB_CLEAR_NODE(&node->node);
43 }
44 
timerqueue_init_head(struct timerqueue_head * head)45 static inline void timerqueue_init_head(struct timerqueue_head *head)
46 {
47 	head->head = RB_ROOT;
48 	head->next = NULL;
49 }
50 #endif /* _LINUX_TIMERQUEUE_H */
51