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bec39940 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
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. | |
bec39940 DG |
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 |
bec39940 DG |
11 | * more details. |
12 | * | |
d14d33bf AM |
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. | |
bec39940 DG |
16 | */ |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <assert.h> | |
20 | #include <string.h> | |
21 | #include <urcu.h> | |
22 | #include <urcu/compiler.h> | |
23 | ||
990570ed DG |
24 | #include <common/common.h> |
25 | #include <common/defaults.h> | |
bec39940 | 26 | |
10a8a223 | 27 | #include "hashtable.h" |
bec39940 DG |
28 | #include "utils.h" |
29 | ||
30 | #define HASH_SEED 0x42UL /* The answer to life */ | |
31 | ||
32 | static unsigned long min_hash_alloc_size = 1; | |
33 | static unsigned long max_hash_buckets_size = (1UL << 20); | |
34 | ||
35 | /* | |
36 | * Match function for string node. | |
37 | */ | |
38 | static int match_str(struct cds_lfht_node *node, const void *key) | |
39 | { | |
40 | struct lttng_ht_node_str *match_node = | |
41 | caa_container_of(node, struct lttng_ht_node_str, node); | |
42 | ||
43 | return hash_match_key_str(match_node->key, (void *) key); | |
44 | } | |
45 | ||
46 | /* | |
47 | * Match function for ulong node. | |
48 | */ | |
49 | static int match_ulong(struct cds_lfht_node *node, const void *key) | |
50 | { | |
51 | struct lttng_ht_node_ulong *match_node = | |
52 | caa_container_of(node, struct lttng_ht_node_ulong, node); | |
53 | ||
54 | return hash_match_key_ulong((void *) match_node->key, (void *) key); | |
55 | } | |
56 | ||
57 | /* | |
58 | * Return an allocated lttng hashtable. | |
59 | */ | |
60 | struct lttng_ht *lttng_ht_new(unsigned long size, int type) | |
61 | { | |
62 | struct lttng_ht *ht; | |
63 | ||
64 | /* Test size */ | |
dc78d159 MD |
65 | if (!size) |
66 | size = DEFAULT_HT_SIZE; | |
bec39940 DG |
67 | |
68 | ht = zmalloc(sizeof(*ht)); | |
69 | if (ht == NULL) { | |
70 | PERROR("zmalloc lttng_ht"); | |
71 | goto error; | |
72 | } | |
73 | ||
74 | ht->ht = cds_lfht_new(size, min_hash_alloc_size, max_hash_buckets_size, | |
75 | CDS_LFHT_AUTO_RESIZE, NULL); | |
76 | /* | |
77 | * There is already an assert in the RCU hashtable code so if the ht is | |
78 | * NULL here there is a *huge* problem. | |
79 | */ | |
80 | assert(ht->ht); | |
81 | ||
82 | switch (type) { | |
83 | case LTTNG_HT_TYPE_STRING: | |
84 | ht->match_fct = match_str; | |
85 | ht->hash_fct = hash_key_str; | |
86 | break; | |
87 | case LTTNG_HT_TYPE_ULONG: | |
88 | ht->match_fct = match_ulong; | |
89 | ht->hash_fct = hash_key_ulong; | |
90 | break; | |
91 | default: | |
92 | ERR("Unknown lttng hashtable type %d", type); | |
93 | goto error; | |
94 | } | |
95 | ||
96 | DBG3("Created hashtable size %lu at %p of type %d", size, ht->ht, type); | |
97 | ||
98 | return ht; | |
99 | ||
100 | error: | |
101 | return NULL; | |
102 | } | |
103 | ||
104 | /* | |
105 | * Free a lttng hashtable. | |
106 | */ | |
107 | void lttng_ht_destroy(struct lttng_ht *ht) | |
108 | { | |
109 | int ret; | |
110 | ||
111 | ret = cds_lfht_destroy(ht->ht, NULL); | |
112 | assert(!ret); | |
cf5280ea | 113 | free(ht); |
bec39940 DG |
114 | } |
115 | ||
116 | /* | |
117 | * Init lttng ht node string. | |
118 | */ | |
119 | void lttng_ht_node_init_str(struct lttng_ht_node_str *node, char *key) | |
120 | { | |
121 | assert(node); | |
122 | ||
123 | node->key = key; | |
124 | cds_lfht_node_init(&node->node); | |
125 | } | |
126 | ||
127 | /* | |
128 | * Init lttng ht node unsigned long. | |
129 | */ | |
130 | void lttng_ht_node_init_ulong(struct lttng_ht_node_ulong *node, | |
131 | unsigned long key) | |
132 | { | |
133 | assert(node); | |
134 | ||
135 | node->key = key; | |
136 | cds_lfht_node_init(&node->node); | |
137 | } | |
138 | ||
139 | /* | |
140 | * Free lttng ht node string. | |
141 | */ | |
142 | void lttng_ht_node_free_str(struct lttng_ht_node_str *node) | |
143 | { | |
144 | assert(node); | |
145 | free(node); | |
146 | } | |
147 | ||
148 | /* | |
149 | * Free lttng ht node unsigned long. | |
150 | */ | |
151 | void lttng_ht_node_free_ulong(struct lttng_ht_node_ulong *node) | |
152 | { | |
153 | assert(node); | |
154 | free(node); | |
155 | } | |
156 | ||
157 | /* | |
158 | * Lookup function in hashtable. | |
159 | */ | |
160 | void lttng_ht_lookup(struct lttng_ht *ht, void *key, | |
161 | struct lttng_ht_iter *iter) | |
162 | { | |
163 | assert(ht); | |
164 | assert(ht->ht); | |
bec39940 DG |
165 | |
166 | cds_lfht_lookup(ht->ht, ht->hash_fct(key, HASH_SEED), | |
167 | ht->match_fct, key, &iter->iter); | |
168 | } | |
169 | ||
170 | /* | |
171 | * Add unique string node to hashtable. | |
172 | */ | |
173 | void lttng_ht_add_unique_str(struct lttng_ht *ht, | |
174 | struct lttng_ht_node_str *node) | |
175 | { | |
176 | struct cds_lfht_node *node_ptr; | |
177 | assert(ht); | |
178 | assert(ht->ht); | |
179 | assert(node); | |
180 | ||
181 | node_ptr = cds_lfht_add_unique(ht->ht, ht->hash_fct(node->key, HASH_SEED), | |
182 | ht->match_fct, node->key, &node->node); | |
183 | assert(node_ptr == &node->node); | |
184 | } | |
185 | ||
186 | /* | |
187 | * Add unique unsigned long node to hashtable. | |
188 | */ | |
189 | void lttng_ht_add_unique_ulong(struct lttng_ht *ht, | |
190 | struct lttng_ht_node_ulong *node) | |
191 | { | |
192 | struct cds_lfht_node *node_ptr; | |
193 | assert(ht); | |
194 | assert(ht->ht); | |
195 | assert(node); | |
196 | ||
197 | node_ptr = cds_lfht_add_unique(ht->ht, | |
198 | ht->hash_fct((void *) node->key, HASH_SEED), ht->match_fct, | |
199 | (void *) node->key, &node->node); | |
200 | assert(node_ptr == &node->node); | |
201 | } | |
202 | ||
702b1ea4 MD |
203 | /* |
204 | * Add replace unsigned long node to hashtable. | |
205 | */ | |
206 | struct lttng_ht_node_ulong *lttng_ht_add_replace_ulong(struct lttng_ht *ht, | |
207 | struct lttng_ht_node_ulong *node) | |
208 | { | |
209 | struct cds_lfht_node *node_ptr; | |
210 | assert(ht); | |
211 | assert(ht->ht); | |
212 | assert(node); | |
213 | ||
214 | node_ptr = cds_lfht_add_replace(ht->ht, | |
215 | ht->hash_fct((void *) node->key, HASH_SEED), ht->match_fct, | |
216 | (void *) node->key, &node->node); | |
217 | if (!node_ptr) { | |
218 | return NULL; | |
219 | } else { | |
220 | return caa_container_of(node_ptr, struct lttng_ht_node_ulong, node); | |
221 | } | |
222 | assert(node_ptr == &node->node); | |
223 | } | |
224 | ||
bec39940 DG |
225 | /* |
226 | * Delete node from hashtable. | |
227 | */ | |
228 | int lttng_ht_del(struct lttng_ht *ht, struct lttng_ht_iter *iter) | |
229 | { | |
230 | assert(ht); | |
231 | assert(ht->ht); | |
232 | assert(iter); | |
233 | ||
234 | return cds_lfht_del(ht->ht, iter->iter.node); | |
235 | } | |
236 | ||
237 | /* | |
238 | * Get first node in the hashtable. | |
239 | */ | |
240 | void lttng_ht_get_first(struct lttng_ht *ht, struct lttng_ht_iter *iter) | |
241 | { | |
242 | assert(ht); | |
243 | assert(ht->ht); | |
244 | assert(iter); | |
245 | ||
246 | cds_lfht_first(ht->ht, &iter->iter); | |
247 | } | |
248 | ||
249 | /* | |
250 | * Get next node in the hashtable. | |
251 | */ | |
252 | void lttng_ht_get_next(struct lttng_ht *ht, struct lttng_ht_iter *iter) | |
253 | { | |
254 | assert(ht); | |
255 | assert(ht->ht); | |
256 | assert(iter); | |
257 | ||
258 | cds_lfht_next(ht->ht, &iter->iter); | |
259 | } | |
260 | ||
261 | /* | |
262 | * Return the number of nodes in the hashtable. | |
263 | */ | |
264 | unsigned long lttng_ht_get_count(struct lttng_ht *ht) | |
265 | { | |
266 | long scb, sca; | |
267 | unsigned long count; | |
268 | ||
269 | assert(ht); | |
270 | assert(ht->ht); | |
271 | ||
272 | cds_lfht_count_nodes(ht->ht, &scb, &count, &sca); | |
273 | ||
274 | return count; | |
275 | } | |
276 | ||
277 | /* | |
278 | * Return lttng ht string node from iterator. | |
279 | */ | |
280 | struct lttng_ht_node_str *lttng_ht_iter_get_node_str( | |
281 | struct lttng_ht_iter *iter) | |
282 | { | |
283 | struct cds_lfht_node *node; | |
284 | ||
285 | assert(iter); | |
286 | node = cds_lfht_iter_get_node(&iter->iter); | |
287 | if (!node) { | |
288 | return NULL; | |
289 | } | |
290 | return caa_container_of(node, struct lttng_ht_node_str, node); | |
291 | } | |
292 | ||
293 | /* | |
294 | * Return lttng ht unsigned long node from iterator. | |
295 | */ | |
296 | struct lttng_ht_node_ulong *lttng_ht_iter_get_node_ulong( | |
297 | struct lttng_ht_iter *iter) | |
298 | { | |
299 | struct cds_lfht_node *node; | |
300 | ||
301 | assert(iter); | |
302 | node = cds_lfht_iter_get_node(&iter->iter); | |
303 | if (!node) { | |
304 | return NULL; | |
305 | } | |
306 | return caa_container_of(node, struct lttng_ht_node_ulong, node); | |
307 | } |