1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_TIMERQUEUE_H
3 #define _LINUX_TIMERQUEUE_H
4 
5 #include <linux/rbtree.h>
6 #include <linux/ktime.h>
7 
8 
9 struct timerqueue_node {
10 	struct rb_node node;
11 	ktime_t expires;
12 };
13 
14 struct timerqueue_head {
15 	struct rb_root head;
16 	struct timerqueue_node *next;
17 };
18 
19 
20 extern bool timerqueue_add(struct timerqueue_head *head,
21 			   struct timerqueue_node *node);
22 extern bool timerqueue_del(struct timerqueue_head *head,
23 			   struct timerqueue_node *node);
24 extern struct timerqueue_node *timerqueue_iterate_next(
25 						struct timerqueue_node *node);
26 
27 /**
28  * timerqueue_getnext - Returns the timer with the earliest expiration time
29  *
30  * @head: head of timerqueue
31  *
32  * Returns a pointer to the timer node that has the
33  * earliest expiration time.
34  */
35 static inline
timerqueue_getnext(struct timerqueue_head * head)36 struct timerqueue_node *timerqueue_getnext(struct timerqueue_head *head)
37 {
38 	return head->next;
39 }
40 
timerqueue_init(struct timerqueue_node * node)41 static inline void timerqueue_init(struct timerqueue_node *node)
42 {
43 	RB_CLEAR_NODE(&node->node);
44 }
45 
timerqueue_init_head(struct timerqueue_head * head)46 static inline void timerqueue_init_head(struct timerqueue_head *head)
47 {
48 	head->head = RB_ROOT;
49 	head->next = NULL;
50 }
51 #endif /* _LINUX_TIMERQUEUE_H */
52