urcu/rculfhash.h

   1 #ifndef _URCU_RCULFHASH_H
   2 #define _URCU_RCULFHASH_H
   3
   4 #include <stdint.h>
   5 #include <urcu-call-rcu.h>
   6
   7 struct rcu_ht_node {
   8         struct rcu_ht_node *next;
   9         void *key;
  10         size_t key_len;
  11         unsigned long hash;
  12         unsigned long reverse_hash;
  13         unsigned int dummy;
  14         struct rcu_head head;
  15 };
  16
  17 struct rcu_ht;
  18
  19 /*
  20  * Caution !
  21  * Ensure reader and writer threads are registered as urcu readers.
  22  */
  23
  24 typedef unsigned long (*ht_hash_fct)(void *key, size_t length,
  25                                      unsigned long seed);
  26 typedef unsigned long (*ht_compare_fct)(void *key1, size_t key1_len,
  27                                         void *key2, size_t key2_len);
  28
  29 static inline
  30 void ht_node_init(struct rcu_ht_node *node, void *key,
  31                   size_t key_len)
  32 {
  33         node->key = key;
  34         node->key_len = key_len;
  35         node->dummy = 0;
  36 }
  37
  38 /*
  39  * init_size must be power of two.
  40  */
  41 struct rcu_ht *ht_new(ht_hash_fct hash_fct,
  42                       ht_compare_fct compare_fct,
  43                       unsigned long hash_seed,
  44                       unsigned long init_size,
  45                       void (*ht_call_rcu)(struct rcu_head *head,
  46                                 void (*func)(struct rcu_head *head)));
  47
  48 int ht_destroy(struct rcu_ht *ht);
  49 /* Count the number of nodes in the hash table. Call with rcu_read_lock held. */
  50 void ht_count_nodes(struct rcu_ht *ht,
  51                 unsigned long *count,
  52                 unsigned long *removed);
  53
  54 /* Call with rcu_read_lock held. */
  55 struct rcu_ht_node *ht_lookup(struct rcu_ht *ht, void *key, size_t key_len);
  56
  57 /* Call with rcu_read_lock held. */
  58 void ht_add(struct rcu_ht *ht, struct rcu_ht_node *node);
  59
  60 /* Call with rcu_read_lock held. */
  61 int ht_add_unique(struct rcu_ht *ht, struct rcu_ht_node *node);
  62
  63 /* Call with rcu_read_lock held. */
  64 int ht_remove(struct rcu_ht *ht, struct rcu_ht_node *node);
  65
  66 void ht_resize(struct rcu_ht *ht, int growth);
  67
  68 #endif /* _URCU_RCULFHASH_H */