LXR linux/include/linux/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/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_cached rb_root;
  16};
  17
  18
  19extern bool timerqueue_add(struct timerqueue_head *head,
  20                           struct timerqueue_node *node);
  21extern bool timerqueue_del(struct timerqueue_head *head,
  22                           struct timerqueue_node *node);
  23extern struct timerqueue_node *timerqueue_iterate_next(
  24                                                struct timerqueue_node *node);
  25
  26/**
  27 * timerqueue_getnext - Returns the timer with the earliest expiration time
  28 *
  29 * @head: head of timerqueue
  30 *
  31 * Returns a pointer to the timer node that has the earliest expiration time.
  32 */
  33static inline
  34struct timerqueue_node *timerqueue_getnext(struct timerqueue_head *head)
  35{
  36        struct rb_node *leftmost = rb_first_cached(&head->rb_root);
  37
  38        return rb_entry(leftmost, struct timerqueue_node, node);
  39}
  40
  41static inline void timerqueue_init(struct timerqueue_node *node)
  42{
  43        RB_CLEAR_NODE(&node->node);
  44}
  45
  46static inline bool timerqueue_node_queued(struct timerqueue_node *node)
  47{
  48        return !RB_EMPTY_NODE(&node->node);
  49}
  50
  51static inline bool timerqueue_node_expires(struct timerqueue_node *node)
  52{
  53        return node->expires;
  54}
  55
  56static inline void timerqueue_init_head(struct timerqueue_head *head)
  57{
  58        head->rb_root = RB_ROOT_CACHED;
  59}
  60#endif /* _LINUX_TIMERQUEUE_H */
  61