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
8 extern bool timerqueue_add(struct timerqueue_head *head,
9 struct timerqueue_node *node);
10 extern bool timerqueue_del(struct timerqueue_head *head,
11 struct timerqueue_node *node);
12 extern 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 */
22 static inline
23 struct 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
30 static inline void timerqueue_init(struct timerqueue_node *node)
31 {
32 RB_CLEAR_NODE(&node->node);
33 }
34
35 static inline bool timerqueue_node_queued(struct timerqueue_node *node)
36 {
37 return !RB_EMPTY_NODE(&node->node);
38 }
39
40 static inline void timerqueue_init_head(struct timerqueue_head *head)
41 {
42 head->rb_root = RB_ROOT_CACHED;
43 }
44 #endif /* _LINUX_TIMERQUEUE_H */
45
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