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
9struct timerqueue_node {
10 struct rb_node node;
11 ktime_t expires;
12};
13
14struct timerqueue_head {
15 struct rb_root head;
16 struct timerqueue_node *next;
17};
18
19
20extern bool timerqueue_add(struct timerqueue_head *head,
21 struct timerqueue_node *node);
22extern bool timerqueue_del(struct timerqueue_head *head,
23 struct timerqueue_node *node);
24extern 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 */
35static inline
36struct timerqueue_node *timerqueue_getnext(struct timerqueue_head *head)
37{
38 return head->next;
39}
40
41static inline void timerqueue_init(struct timerqueue_node *node)
42{
43 RB_CLEAR_NODE(&node->node);
44}
45
46static 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