src/common/hashtable/hashtable.h

   1 /*
   2  * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
   3  *
   4  * SPDX-License-Identifier: GPL-2.0-only
   5  *
   6  */
   7
   8 #ifndef _LTT_HT_H
   9 #define _LTT_HT_H
  10
  11 #include <urcu.h>
  12 #include <stdint.h>
  13
  14 #include <common/macros.h>
  15 #include <urcu/rculfhash.h>
  16
  17 extern unsigned long lttng_ht_seed;
  18
  19 typedef unsigned long (*hash_fct)(const void *_key, unsigned long seed);
  20 typedef cds_lfht_match_fct hash_match_fct;
  21
  22 enum lttng_ht_type {
  23         LTTNG_HT_TYPE_STRING,
  24         LTTNG_HT_TYPE_ULONG,
  25         LTTNG_HT_TYPE_U64,
  26         LTTNG_HT_TYPE_TWO_U64,
  27 };
  28
  29 struct lttng_ht {
  30         struct cds_lfht *ht;
  31         cds_lfht_match_fct match_fct;
  32         hash_fct hash_fct;
  33 };
  34
  35 struct lttng_ht_iter {
  36         struct cds_lfht_iter iter;
  37 };
  38
  39 struct lttng_ht_node_str {
  40         char *key;
  41         struct cds_lfht_node node;
  42         struct rcu_head head;
  43 };
  44
  45 struct lttng_ht_node_ulong {
  46         unsigned long key;
  47         struct cds_lfht_node node;
  48         struct rcu_head head;
  49 };
  50
  51 struct lttng_ht_node_u64 {
  52         uint64_t key;
  53         struct cds_lfht_node node;
  54         struct rcu_head head;
  55 };
  56
  57 struct lttng_ht_two_u64 {
  58         uint64_t key1;
  59         uint64_t key2;
  60 };
  61
  62 struct lttng_ht_node_two_u64 {
  63         struct lttng_ht_two_u64 key;
  64         struct cds_lfht_node node;
  65         struct rcu_head head;
  66 };
  67
  68 /* Hashtable new and destroy */
  69 struct lttng_ht *lttng_ht_new(unsigned long size, int type);
  70 void lttng_ht_destroy(struct lttng_ht *ht);
  71
  72 /* Specialized node init and free functions */
  73 void lttng_ht_node_init_str(struct lttng_ht_node_str *node, char *key);
  74 void lttng_ht_node_init_ulong(struct lttng_ht_node_ulong *node,
  75                 unsigned long key);
  76 void lttng_ht_node_init_u64(struct lttng_ht_node_u64 *node,
  77                 uint64_t key);
  78 void lttng_ht_node_init_two_u64(struct lttng_ht_node_two_u64 *node,
  79                 uint64_t key1, uint64_t key2);
  80 void lttng_ht_node_free_str(struct lttng_ht_node_str *node);
  81 void lttng_ht_node_free_ulong(struct lttng_ht_node_ulong *node);
  82 void lttng_ht_node_free_u64(struct lttng_ht_node_u64 *node);
  83 void lttng_ht_node_free_two_u64(struct lttng_ht_node_two_u64 *node);
  84
  85 void lttng_ht_lookup(struct lttng_ht *ht, const void *key,
  86                 struct lttng_ht_iter *iter);
  87
  88 /* Specialized add unique functions */
  89 void lttng_ht_add_unique_str(struct lttng_ht *ht,
  90                 struct lttng_ht_node_str *node);
  91 void lttng_ht_add_unique_ulong(struct lttng_ht *ht,
  92                 struct lttng_ht_node_ulong *node);
  93 void lttng_ht_add_unique_u64(struct lttng_ht *ht,
  94                 struct lttng_ht_node_u64 *node);
  95 void lttng_ht_add_unique_two_u64(struct lttng_ht *ht,
  96                 struct lttng_ht_node_two_u64 *node);
  97 struct lttng_ht_node_ulong *lttng_ht_add_replace_ulong(
  98                 struct lttng_ht *ht, struct lttng_ht_node_ulong *node);
  99 struct lttng_ht_node_u64 *lttng_ht_add_replace_u64(
 100                 struct lttng_ht *ht, struct lttng_ht_node_u64 *node);
 101 void lttng_ht_add_str(struct lttng_ht *ht,
 102                 struct lttng_ht_node_str *node);
 103 void lttng_ht_add_ulong(struct lttng_ht *ht,
 104                 struct lttng_ht_node_ulong *node);
 105 void lttng_ht_add_u64(struct lttng_ht *ht,
 106                 struct lttng_ht_node_u64 *node);
 107
 108 int lttng_ht_del(struct lttng_ht *ht, struct lttng_ht_iter *iter);
 109
 110 void lttng_ht_get_first(struct lttng_ht *ht,
 111                 struct lttng_ht_iter *iter);
 112 void lttng_ht_get_next(struct lttng_ht *ht, struct lttng_ht_iter *iter);
 113
 114 unsigned long lttng_ht_get_count(struct lttng_ht *ht);
 115
 116 struct lttng_ht_node_str *lttng_ht_iter_get_node_str(
 117                 struct lttng_ht_iter *iter);
 118 struct lttng_ht_node_ulong *lttng_ht_iter_get_node_ulong(
 119                 struct lttng_ht_iter *iter);
 120 struct lttng_ht_node_u64 *lttng_ht_iter_get_node_u64(
 121                 struct lttng_ht_iter *iter);
 122 struct lttng_ht_node_two_u64 *lttng_ht_iter_get_node_two_u64(
 123                 struct lttng_ht_iter *iter);
 124
 125 #endif /* _LTT_HT_H */