include/linux/timerqueue.h

   1 #ifndef _LINUX_TIMERQUEUE_H
   2 #define _LINUX_TIMERQUEUE_H
   3
   4 #include <linux/rbtree.h>
   5 #include <linux/ktime.h>
   6
   7
   8 struct timerqueue_node {
   9         struct rb_node node;
  10         ktime_t expires;
  11 };
  12
  13 struct timerqueue_head {
  14         struct rb_root head;
  15         struct timerqueue_node *next;
  16 };
  17
  18
  19 extern bool timerqueue_add(struct timerqueue_head *head,
  20                            struct timerqueue_node *node);
  21 extern bool timerqueue_del(struct timerqueue_head *head,
  22                            struct timerqueue_node *node);
  23 extern 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
  32  * earliest expiration time.
  33  */
  34 static inline
  35 struct timerqueue_node *timerqueue_getnext(struct timerqueue_head *head)
  36 {
  37         return head->next;
  38 }
  39
  40 static inline void timerqueue_init(struct timerqueue_node *node)
  41 {
  42         RB_CLEAR_NODE(&node->node);
  43 }
  44
  45 static inline void timerqueue_init_head(struct timerqueue_head *head)
  46 {
  47         head->head = RB_ROOT;
  48         head->next = NULL;
  49 }
  50 #endif /* _LINUX_TIMERQUEUE_H */