Add support for non unique add string in hashtable
[lttng-tools.git] / src / common / hashtable / hashtable.h
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
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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.
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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
d14d33bf 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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11 * more details.
12 *
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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.
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16 */
17
18#ifndef _LTT_HT_H
19#define _LTT_HT_H
20
21#include <urcu.h>
d88aee68 22#include <stdint.h>
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23
24#include "rculfhash.h"
25#include "rculfhash-internal.h"
bec39940 26
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27extern unsigned long lttng_ht_seed;
28
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29typedef unsigned long (*hash_fct)(void *_key, unsigned long seed);
30typedef cds_lfht_match_fct hash_match_fct;
31
32enum lttng_ht_type {
33 LTTNG_HT_TYPE_STRING,
34 LTTNG_HT_TYPE_ULONG,
d88aee68 35 LTTNG_HT_TYPE_U64,
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36};
37
38struct lttng_ht {
39 struct cds_lfht *ht;
40 cds_lfht_match_fct match_fct;
41 hash_fct hash_fct;
42};
43
44struct lttng_ht_iter {
45 struct cds_lfht_iter iter;
46};
47
48struct lttng_ht_node_str {
49 char *key;
50 struct cds_lfht_node node;
51 struct rcu_head head;
52};
53
54struct lttng_ht_node_ulong {
55 unsigned long key;
56 struct cds_lfht_node node;
57 struct rcu_head head;
58};
59
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60struct lttng_ht_node_u64 {
61 uint64_t key;
62 struct cds_lfht_node node;
63 struct rcu_head head;
64};
65
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66/* Hashtable new and destroy */
67extern struct lttng_ht *lttng_ht_new(unsigned long size, int type);
68extern void lttng_ht_destroy(struct lttng_ht *ht);
69
70/* Specialized node init and free functions */
71extern void lttng_ht_node_init_str(struct lttng_ht_node_str *node, char *key);
72extern void lttng_ht_node_init_ulong(struct lttng_ht_node_ulong *node,
73 unsigned long key);
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74extern void lttng_ht_node_init_u64(struct lttng_ht_node_u64 *node,
75 uint64_t key);
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76extern void lttng_ht_node_free_str(struct lttng_ht_node_str *node);
77extern void lttng_ht_node_free_ulong(struct lttng_ht_node_ulong *node);
7972aab2 78extern void lttng_ht_node_free_u64(struct lttng_ht_node_u64 *node);
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79
80extern void lttng_ht_lookup(struct lttng_ht *ht, void *key,
81 struct lttng_ht_iter *iter);
82
83/* Specialized add unique functions */
84extern void lttng_ht_add_unique_str(struct lttng_ht *ht,
85 struct lttng_ht_node_str *node);
86extern void lttng_ht_add_unique_ulong(struct lttng_ht *ht,
87 struct lttng_ht_node_ulong *node);
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88extern void lttng_ht_add_unique_u64(struct lttng_ht *ht,
89 struct lttng_ht_node_u64 *node);
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90extern struct lttng_ht_node_ulong *lttng_ht_add_replace_ulong(
91 struct lttng_ht *ht, struct lttng_ht_node_ulong *node);
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92extern struct lttng_ht_node_u64 *lttng_ht_add_replace_u64(
93 struct lttng_ht *ht, struct lttng_ht_node_u64 *node);
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94extern void lttng_ht_add_str(struct lttng_ht *ht,
95 struct lttng_ht_node_str *node);
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96extern void lttng_ht_add_ulong(struct lttng_ht *ht,
97 struct lttng_ht_node_ulong *node);
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98extern void lttng_ht_add_u64(struct lttng_ht *ht,
99 struct lttng_ht_node_u64 *node);
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100
101extern int lttng_ht_del(struct lttng_ht *ht, struct lttng_ht_iter *iter);
102
103extern void lttng_ht_get_first(struct lttng_ht *ht,
104 struct lttng_ht_iter *iter);
105extern void lttng_ht_get_next(struct lttng_ht *ht, struct lttng_ht_iter *iter);
106
107extern unsigned long lttng_ht_get_count(struct lttng_ht *ht);
108
109extern struct lttng_ht_node_str *lttng_ht_iter_get_node_str(
110 struct lttng_ht_iter *iter);
111extern struct lttng_ht_node_ulong *lttng_ht_iter_get_node_ulong(
112 struct lttng_ht_iter *iter);
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113extern struct lttng_ht_node_u64 *lttng_ht_iter_get_node_u64(
114 struct lttng_ht_iter *iter);
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115
116#endif /* _LTT_HT_H */
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