timerqueue.h

 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/timerqueue_types.h>
 7
 8extern bool timerqueue_add(struct timerqueue_head *head,
 9			   struct timerqueue_node *node);
10extern bool timerqueue_del(struct timerqueue_head *head,
11			   struct timerqueue_node *node);
12extern struct timerqueue_node *timerqueue_iterate_next(
13						struct timerqueue_node *node);
14
15/**
16 * timerqueue_getnext - Returns the timer with the earliest expiration time
17 *
18 * @head: head of timerqueue
19 *
20 * Returns a pointer to the timer node that has the earliest expiration time.
21 */
22static inline
23struct timerqueue_node *timerqueue_getnext(struct timerqueue_head *head)
24{
25	struct rb_node *leftmost = rb_first_cached(&head->rb_root);
26
27	return rb_entry_safe(leftmost, struct timerqueue_node, node);
28}
29
30static inline void timerqueue_init(struct timerqueue_node *node)
31{
32	RB_CLEAR_NODE(&node->node);
33}
34
35static inline bool timerqueue_node_queued(struct timerqueue_node *node)
36{
37	return !RB_EMPTY_NODE(&node->node);
38}
39
40static inline void timerqueue_init_head(struct timerqueue_head *head)
41{
42	head->rb_root = RB_ROOT_CACHED;
43}
44#endif /* _LINUX_TIMERQUEUE_H */