| 1 | #ifndef _URCU_RCULFHASH_H |
| 2 | #define _URCU_RCULFHASH_H |
| 3 | |
| 4 | #include <stdint.h> |
| 5 | #include <urcu-call-rcu.h> |
| 6 | |
| 7 | #ifdef __cplusplus |
| 8 | extern "C" { |
| 9 | #endif |
| 10 | |
| 11 | struct _rcu_ht_node { |
| 12 | struct rcu_ht_node *next; /* ptr | DUMMY_FLAG | REMOVED_FLAG */ |
| 13 | unsigned long reverse_hash; |
| 14 | }; |
| 15 | |
| 16 | struct rcu_ht_node { |
| 17 | /* cache-hot for iteration */ |
| 18 | struct _rcu_ht_node p; /* needs to be first field */ |
| 19 | void *key; |
| 20 | unsigned int key_len; |
| 21 | /* cache-cold for iteration */ |
| 22 | struct rcu_head head; |
| 23 | }; |
| 24 | |
| 25 | struct rcu_ht; |
| 26 | |
| 27 | /* |
| 28 | * Caution ! |
| 29 | * Ensure reader and writer threads are registered as urcu readers. |
| 30 | */ |
| 31 | |
| 32 | typedef unsigned long (*ht_hash_fct)(void *key, size_t length, |
| 33 | unsigned long seed); |
| 34 | typedef unsigned long (*ht_compare_fct)(void *key1, size_t key1_len, |
| 35 | void *key2, size_t key2_len); |
| 36 | |
| 37 | static inline |
| 38 | void ht_node_init(struct rcu_ht_node *node, void *key, |
| 39 | size_t key_len) |
| 40 | { |
| 41 | node->key = key; |
| 42 | node->key_len = key_len; |
| 43 | } |
| 44 | |
| 45 | /* |
| 46 | * init_size must be power of two. |
| 47 | */ |
| 48 | struct rcu_ht *ht_new(ht_hash_fct hash_fct, |
| 49 | ht_compare_fct compare_fct, |
| 50 | unsigned long hash_seed, |
| 51 | unsigned long init_size, |
| 52 | void (*ht_call_rcu)(struct rcu_head *head, |
| 53 | void (*func)(struct rcu_head *head))); |
| 54 | |
| 55 | int ht_destroy(struct rcu_ht *ht); |
| 56 | /* Count the number of nodes in the hash table. Call with rcu_read_lock held. */ |
| 57 | void ht_count_nodes(struct rcu_ht *ht, |
| 58 | unsigned long *count, |
| 59 | unsigned long *removed); |
| 60 | |
| 61 | /* Call with rcu_read_lock held. */ |
| 62 | struct rcu_ht_node *ht_lookup(struct rcu_ht *ht, void *key, size_t key_len); |
| 63 | |
| 64 | /* Call with rcu_read_lock held. */ |
| 65 | void ht_add(struct rcu_ht *ht, struct rcu_ht_node *node); |
| 66 | |
| 67 | /* |
| 68 | * Call with rcu_read_lock held. |
| 69 | * Returns the node added upon success. |
| 70 | * Returns the unique node already present upon failure. If ht_add_unique fails, |
| 71 | * the node passed as parameter should be freed by the caller. |
| 72 | */ |
| 73 | struct rcu_ht_node *ht_add_unique(struct rcu_ht *ht, struct rcu_ht_node *node); |
| 74 | |
| 75 | /* Call with rcu_read_lock held. */ |
| 76 | int ht_remove(struct rcu_ht *ht, struct rcu_ht_node *node); |
| 77 | |
| 78 | void ht_resize(struct rcu_ht *ht, int growth); |
| 79 | |
| 80 | #ifdef __cplusplus |
| 81 | } |
| 82 | #endif |
| 83 | |
| 84 | #endif /* _URCU_RCULFHASH_H */ |