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
  23 #include "rculfhash.h"
  24 #include "rculfhash-internal.h"
  25
  26 extern unsigned long lttng_ht_seed;
  27
  28 typedef unsigned long (*hash_fct)(void *_key, unsigned long seed);
  29 typedef cds_lfht_match_fct hash_match_fct;
  30
  31 enum lttng_ht_type {
  32         LTTNG_HT_TYPE_STRING,
  33         LTTNG_HT_TYPE_ULONG,
  34 };
  35
  36 struct lttng_ht {
  37         struct cds_lfht *ht;
  38         cds_lfht_match_fct match_fct;
  39         hash_fct hash_fct;
  40 };
  41
  42 struct lttng_ht_iter {
  43         struct cds_lfht_iter iter;
  44 };
  45
  46 struct lttng_ht_node_str {
  47         char *key;
  48         struct cds_lfht_node node;
  49         struct rcu_head head;
  50 };
  51
  52 struct lttng_ht_node_ulong {
  53         unsigned long key;
  54         struct cds_lfht_node node;
  55         struct rcu_head head;
  56 };
  57
  58 /* Hashtable new and destroy */
  59 extern struct lttng_ht *lttng_ht_new(unsigned long size, int type);
  60 extern void lttng_ht_destroy(struct lttng_ht *ht);
  61
  62 /* Specialized node init and free functions */
  63 extern void lttng_ht_node_init_str(struct lttng_ht_node_str *node, char *key);
  64 extern void lttng_ht_node_init_ulong(struct lttng_ht_node_ulong *node,
  65                 unsigned long key);
  66 extern void lttng_ht_node_free_str(struct lttng_ht_node_str *node);
  67 extern void lttng_ht_node_free_ulong(struct lttng_ht_node_ulong *node);
  68
  69 extern void lttng_ht_lookup(struct lttng_ht *ht, void *key,
  70                 struct lttng_ht_iter *iter);
  71
  72 /* Specialized add unique functions */
  73 extern void lttng_ht_add_unique_str(struct lttng_ht *ht,
  74                 struct lttng_ht_node_str *node);
  75 extern void lttng_ht_add_unique_ulong(struct lttng_ht *ht,
  76                 struct lttng_ht_node_ulong *node);
  77 extern struct lttng_ht_node_ulong *lttng_ht_add_replace_ulong(
  78                 struct lttng_ht *ht, struct lttng_ht_node_ulong *node);
  79 extern void lttng_ht_add_ulong(struct lttng_ht *ht,
  80                 struct lttng_ht_node_ulong *node);
  81
  82 extern int lttng_ht_del(struct lttng_ht *ht, struct lttng_ht_iter *iter);
  83
  84 extern void lttng_ht_get_first(struct lttng_ht *ht,
  85                 struct lttng_ht_iter *iter);
  86 extern void lttng_ht_get_next(struct lttng_ht *ht, struct lttng_ht_iter *iter);
  87
  88 extern unsigned long lttng_ht_get_count(struct lttng_ht *ht);
  89
  90 extern struct lttng_ht_node_str *lttng_ht_iter_get_node_str(
  91                 struct lttng_ht_iter *iter);
  92 extern struct lttng_ht_node_ulong *lttng_ht_iter_get_node_ulong(
  93                 struct lttng_ht_iter *iter);
  94
  95 #endif /* _LTT_HT_H */