MySQL 5.6.14 Source Code Document
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assoc.h
1 #ifndef ASSOC_H
2 #define ASSOC_H
3 
4 struct assoc {
5  /* how many powers of 2's worth of buckets we use */
6  unsigned int hashpower;
7 
8 
9  /* Main hash table. This is where we look except during expansion. */
10  hash_item** primary_hashtable;
11 
12  /*
13  * Previous hash table. During expansion, we look here for keys that haven't
14  * been moved over to the primary yet.
15  */
16  hash_item** old_hashtable;
17 
18  /* Number of items in the hash table. */
19  unsigned int hash_items;
20 
21  /* Flag: Are we in the middle of expanding now? */
22  bool expanding;
23 
24  /*
25  * During expansion we migrate values with bucket granularity; this is how
26  * far we've gotten so far. Ranges from 0 .. hashsize(hashpower - 1) - 1.
27  */
28  unsigned int expand_bucket;
29 };
30 
31 /* associative array */
32 ENGINE_ERROR_CODE assoc_init(struct default_engine *engine);
33 hash_item *assoc_find(struct default_engine *engine, uint32_t hash,
34  const char *key, const size_t nkey);
35 int assoc_insert(struct default_engine *engine, uint32_t hash,
36  hash_item *item);
37 void assoc_delete(struct default_engine *engine, uint32_t hash,
38  const char *key, const size_t nkey);
39 int start_assoc_maintenance_thread(struct default_engine *engine);
40 void stop_assoc_maintenance_thread(struct default_engine *engine);
41 
42 #endif