src/common/hashtable/hashtable.h

   1 /*
   2  * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License, version 2 only,
   6  * as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #ifndef _LTT_HT_H
  19 #define _LTT_HT_H
  20
  21 #include <urcu.h>
  22 #include <stdint.h>
  23
  24 #include "rculfhash.h"
  25 #include "rculfhash-internal.h"
  26
  27 extern unsigned long lttng_ht_seed;
  28
  29 typedef unsigned long (*hash_fct)(void *_key, unsigned long seed);
  30 typedef cds_lfht_match_fct hash_match_fct;
  31
  32 enum lttng_ht_type {
  33         LTTNG_HT_TYPE_STRING,
  34         LTTNG_HT_TYPE_ULONG,
  35         LTTNG_HT_TYPE_U64,
  36         LTTNG_HT_TYPE_TWO_U64,
  37 };
  38
  39 struct lttng_ht {
  40         struct cds_lfht *ht;
  41         cds_lfht_match_fct match_fct;
  42         hash_fct hash_fct;
  43 };
  44
  45 struct lttng_ht_iter {
  46         struct cds_lfht_iter iter;
  47 };
  48
  49 struct lttng_ht_node_str {
  50         char *key;
  51         struct cds_lfht_node node;
  52         struct rcu_head head;
  53 };
  54
  55 struct lttng_ht_node_ulong {
  56         unsigned long key;
  57         struct cds_lfht_node node;
  58         struct rcu_head head;
  59 };
  60
  61 struct lttng_ht_node_u64 {
  62         uint64_t key;
  63         struct cds_lfht_node node;
  64         struct rcu_head head;
  65 };
  66
  67 struct lttng_ht_two_u64 {
  68         uint64_t key1;
  69         uint64_t key2;
  70 };
  71
  72 struct lttng_ht_node_two_u64 {
  73         struct lttng_ht_two_u64 key;
  74         struct cds_lfht_node node;
  75         struct rcu_head head;
  76 };
  77
  78 /* Hashtable new and destroy */
  79 extern struct lttng_ht *lttng_ht_new(unsigned long size, int type);
  80 extern void lttng_ht_destroy(struct lttng_ht *ht);
  81
  82 /* Specialized node init and free functions */
  83 extern void lttng_ht_node_init_str(struct lttng_ht_node_str *node, char *key);
  84 extern void lttng_ht_node_init_ulong(struct lttng_ht_node_ulong *node,
  85                 unsigned long key);
  86 extern void lttng_ht_node_init_u64(struct lttng_ht_node_u64 *node,
  87                 uint64_t key);
  88 extern void lttng_ht_node_init_two_u64(struct lttng_ht_node_two_u64 *node,
  89                 uint64_t key1, uint64_t key2);
  90 extern void lttng_ht_node_free_str(struct lttng_ht_node_str *node);
  91 extern void lttng_ht_node_free_ulong(struct lttng_ht_node_ulong *node);
  92 extern void lttng_ht_node_free_u64(struct lttng_ht_node_u64 *node);
  93 extern void lttng_ht_node_free_two_u64(struct lttng_ht_node_two_u64 *node);
  94
  95 extern void lttng_ht_lookup(struct lttng_ht *ht, void *key,
  96                 struct lttng_ht_iter *iter);
  97
  98 /* Specialized add unique functions */
  99 extern void lttng_ht_add_unique_str(struct lttng_ht *ht,
 100                 struct lttng_ht_node_str *node);
 101 extern void lttng_ht_add_unique_ulong(struct lttng_ht *ht,
 102                 struct lttng_ht_node_ulong *node);
 103 extern void lttng_ht_add_unique_u64(struct lttng_ht *ht,
 104                 struct lttng_ht_node_u64 *node);
 105 extern void lttng_ht_add_unique_two_u64(struct lttng_ht *ht,
 106                 struct lttng_ht_node_two_u64 *node);
 107 extern struct lttng_ht_node_ulong *lttng_ht_add_replace_ulong(
 108                 struct lttng_ht *ht, struct lttng_ht_node_ulong *node);
 109 extern struct lttng_ht_node_u64 *lttng_ht_add_replace_u64(
 110                 struct lttng_ht *ht, struct lttng_ht_node_u64 *node);
 111 extern void lttng_ht_add_str(struct lttng_ht *ht,
 112                 struct lttng_ht_node_str *node);
 113 extern void lttng_ht_add_ulong(struct lttng_ht *ht,
 114                 struct lttng_ht_node_ulong *node);
 115 extern void lttng_ht_add_u64(struct lttng_ht *ht,
 116                 struct lttng_ht_node_u64 *node);
 117
 118 extern int lttng_ht_del(struct lttng_ht *ht, struct lttng_ht_iter *iter);
 119
 120 extern void lttng_ht_get_first(struct lttng_ht *ht,
 121                 struct lttng_ht_iter *iter);
 122 extern void lttng_ht_get_next(struct lttng_ht *ht, struct lttng_ht_iter *iter);
 123
 124 extern unsigned long lttng_ht_get_count(struct lttng_ht *ht);
 125
 126 extern struct lttng_ht_node_str *lttng_ht_iter_get_node_str(
 127                 struct lttng_ht_iter *iter);
 128 extern struct lttng_ht_node_ulong *lttng_ht_iter_get_node_ulong(
 129                 struct lttng_ht_iter *iter);
 130 extern struct lttng_ht_node_u64 *lttng_ht_iter_get_node_u64(
 131                 struct lttng_ht_iter *iter);
 132 extern struct lttng_ht_node_two_u64 *lttng_ht_iter_get_node_two_u64(
 133                 struct lttng_ht_iter *iter);
 134
 135 #endif /* _LTT_HT_H */