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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_TIMERQUEUE_H
#define _LINUX_TIMERQUEUE_H
#include <linux/rbtree.h>
#include <linux/ktime.h>
struct timerqueue_node {
struct rb_node node;
ktime_t expires;
};
struct timerqueue_head {
struct rb_root_cached rb_root;
};
extern bool timerqueue_add(struct timerqueue_head *head,
struct timerqueue_node *node);
extern bool timerqueue_del(struct timerqueue_head *head,
struct timerqueue_node *node);
extern struct timerqueue_node *timerqueue_iterate_next(
struct timerqueue_node *node);
/**
* timerqueue_getnext - Returns the timer with the earliest expiration time
*
* @head: head of timerqueue
*
* Returns a pointer to the timer node that has the earliest expiration time.
*/
static inline
struct timerqueue_node *timerqueue_getnext(struct timerqueue_head *head)
{
struct rb_node *leftmost = rb_first_cached(&head->rb_root);
return rb_entry_safe(leftmost, struct timerqueue_node, node);
}
static inline void timerqueue_init(struct timerqueue_node *node)
{
RB_CLEAR_NODE(&node->node);
}
static inline bool timerqueue_node_queued(struct timerqueue_node *node)
{
return !RB_EMPTY_NODE(&node->node);
}
static inline bool timerqueue_node_expires(struct timerqueue_node *node)
{
return node->expires;
}
static inline void timerqueue_init_head(struct timerqueue_head *head)
{
head->rb_root = RB_ROOT_CACHED;
}
#endif /* _LINUX_TIMERQUEUE_H */