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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 | ||
b6314938 | 30 | unsigned long lttng_ht_seed; |
bec39940 DG |
31 | |
32 | static unsigned long min_hash_alloc_size = 1; | |
13fe1164 | 33 | static unsigned long max_hash_buckets_size = 0; |
bec39940 DG |
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 | ||
d88aee68 DG |
57 | /* |
58 | * Match function for u64 node. | |
59 | */ | |
60 | static int match_u64(struct cds_lfht_node *node, const void *key) | |
61 | { | |
62 | struct lttng_ht_node_u64 *match_node = | |
63 | caa_container_of(node, struct lttng_ht_node_u64, node); | |
64 | ||
65 | return hash_match_key_u64(&match_node->key, (void *) key); | |
66 | } | |
67 | ||
bec39940 DG |
68 | /* |
69 | * Return an allocated lttng hashtable. | |
70 | */ | |
71 | struct lttng_ht *lttng_ht_new(unsigned long size, int type) | |
72 | { | |
73 | struct lttng_ht *ht; | |
74 | ||
75 | /* Test size */ | |
dc78d159 MD |
76 | if (!size) |
77 | size = DEFAULT_HT_SIZE; | |
bec39940 DG |
78 | |
79 | ht = zmalloc(sizeof(*ht)); | |
80 | if (ht == NULL) { | |
81 | PERROR("zmalloc lttng_ht"); | |
82 | goto error; | |
83 | } | |
84 | ||
85 | ht->ht = cds_lfht_new(size, min_hash_alloc_size, max_hash_buckets_size, | |
13fe1164 | 86 | CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); |
bec39940 DG |
87 | /* |
88 | * There is already an assert in the RCU hashtable code so if the ht is | |
89 | * NULL here there is a *huge* problem. | |
90 | */ | |
91 | assert(ht->ht); | |
92 | ||
93 | switch (type) { | |
94 | case LTTNG_HT_TYPE_STRING: | |
95 | ht->match_fct = match_str; | |
96 | ht->hash_fct = hash_key_str; | |
97 | break; | |
98 | case LTTNG_HT_TYPE_ULONG: | |
99 | ht->match_fct = match_ulong; | |
100 | ht->hash_fct = hash_key_ulong; | |
101 | break; | |
d88aee68 DG |
102 | case LTTNG_HT_TYPE_U64: |
103 | ht->match_fct = match_u64; | |
104 | ht->hash_fct = hash_key_u64; | |
105 | break; | |
bec39940 DG |
106 | default: |
107 | ERR("Unknown lttng hashtable type %d", type); | |
42305b36 | 108 | lttng_ht_destroy(ht); |
bec39940 DG |
109 | goto error; |
110 | } | |
111 | ||
112 | DBG3("Created hashtable size %lu at %p of type %d", size, ht->ht, type); | |
113 | ||
114 | return ht; | |
115 | ||
116 | error: | |
117 | return NULL; | |
118 | } | |
119 | ||
120 | /* | |
121 | * Free a lttng hashtable. | |
122 | */ | |
123 | void lttng_ht_destroy(struct lttng_ht *ht) | |
124 | { | |
125 | int ret; | |
126 | ||
127 | ret = cds_lfht_destroy(ht->ht, NULL); | |
128 | assert(!ret); | |
cf5280ea | 129 | free(ht); |
bec39940 DG |
130 | } |
131 | ||
132 | /* | |
133 | * Init lttng ht node string. | |
134 | */ | |
135 | void lttng_ht_node_init_str(struct lttng_ht_node_str *node, char *key) | |
136 | { | |
137 | assert(node); | |
138 | ||
139 | node->key = key; | |
140 | cds_lfht_node_init(&node->node); | |
141 | } | |
142 | ||
143 | /* | |
144 | * Init lttng ht node unsigned long. | |
145 | */ | |
146 | void lttng_ht_node_init_ulong(struct lttng_ht_node_ulong *node, | |
147 | unsigned long key) | |
148 | { | |
149 | assert(node); | |
150 | ||
151 | node->key = key; | |
152 | cds_lfht_node_init(&node->node); | |
153 | } | |
154 | ||
d88aee68 DG |
155 | /* |
156 | * Init lttng ht node uint64_t. | |
157 | */ | |
158 | void lttng_ht_node_init_u64(struct lttng_ht_node_u64 *node, | |
159 | uint64_t key) | |
160 | { | |
161 | assert(node); | |
162 | ||
163 | node->key = key; | |
164 | cds_lfht_node_init(&node->node); | |
165 | } | |
166 | ||
bec39940 DG |
167 | /* |
168 | * Free lttng ht node string. | |
169 | */ | |
170 | void lttng_ht_node_free_str(struct lttng_ht_node_str *node) | |
171 | { | |
172 | assert(node); | |
173 | free(node); | |
174 | } | |
175 | ||
176 | /* | |
177 | * Free lttng ht node unsigned long. | |
178 | */ | |
179 | void lttng_ht_node_free_ulong(struct lttng_ht_node_ulong *node) | |
180 | { | |
181 | assert(node); | |
182 | free(node); | |
183 | } | |
184 | ||
d88aee68 DG |
185 | /* |
186 | * Free lttng ht node uint64_t. | |
187 | */ | |
7972aab2 | 188 | void lttng_ht_node_free_u64(struct lttng_ht_node_u64 *node) |
d88aee68 DG |
189 | { |
190 | assert(node); | |
191 | free(node); | |
192 | } | |
193 | ||
bec39940 DG |
194 | /* |
195 | * Lookup function in hashtable. | |
196 | */ | |
197 | void lttng_ht_lookup(struct lttng_ht *ht, void *key, | |
198 | struct lttng_ht_iter *iter) | |
199 | { | |
200 | assert(ht); | |
201 | assert(ht->ht); | |
bec39940 | 202 | |
b6314938 | 203 | cds_lfht_lookup(ht->ht, ht->hash_fct(key, lttng_ht_seed), |
bec39940 DG |
204 | ht->match_fct, key, &iter->iter); |
205 | } | |
206 | ||
207 | /* | |
208 | * Add unique string node to hashtable. | |
209 | */ | |
210 | void lttng_ht_add_unique_str(struct lttng_ht *ht, | |
211 | struct lttng_ht_node_str *node) | |
212 | { | |
213 | struct cds_lfht_node *node_ptr; | |
214 | assert(ht); | |
215 | assert(ht->ht); | |
216 | assert(node); | |
217 | ||
b6314938 | 218 | node_ptr = cds_lfht_add_unique(ht->ht, ht->hash_fct(node->key, lttng_ht_seed), |
bec39940 DG |
219 | ht->match_fct, node->key, &node->node); |
220 | assert(node_ptr == &node->node); | |
221 | } | |
222 | ||
aefea3b7 DG |
223 | /* |
224 | * Add unsigned long node to hashtable. | |
225 | */ | |
226 | void lttng_ht_add_ulong(struct lttng_ht *ht, struct lttng_ht_node_ulong *node) | |
227 | { | |
228 | assert(ht); | |
229 | assert(ht->ht); | |
230 | assert(node); | |
231 | ||
b6314938 | 232 | cds_lfht_add(ht->ht, ht->hash_fct((void *) node->key, lttng_ht_seed), |
aefea3b7 DG |
233 | &node->node); |
234 | } | |
235 | ||
d88aee68 DG |
236 | /* |
237 | * Add uint64_t node to hashtable. | |
238 | ||
239 | */ | |
240 | void lttng_ht_add_u64(struct lttng_ht *ht, struct lttng_ht_node_u64 *node) | |
241 | { | |
242 | assert(ht); | |
243 | assert(ht->ht); | |
244 | assert(node); | |
245 | ||
246 | cds_lfht_add(ht->ht, ht->hash_fct(&node->key, lttng_ht_seed), | |
247 | &node->node); | |
248 | } | |
249 | ||
bec39940 DG |
250 | /* |
251 | * Add unique unsigned long node to hashtable. | |
252 | */ | |
253 | void lttng_ht_add_unique_ulong(struct lttng_ht *ht, | |
254 | struct lttng_ht_node_ulong *node) | |
255 | { | |
256 | struct cds_lfht_node *node_ptr; | |
257 | assert(ht); | |
258 | assert(ht->ht); | |
259 | assert(node); | |
260 | ||
261 | node_ptr = cds_lfht_add_unique(ht->ht, | |
b6314938 | 262 | ht->hash_fct((void *) node->key, lttng_ht_seed), ht->match_fct, |
bec39940 DG |
263 | (void *) node->key, &node->node); |
264 | assert(node_ptr == &node->node); | |
265 | } | |
266 | ||
d88aee68 DG |
267 | /* |
268 | * Add unique uint64_t node to hashtable. | |
269 | */ | |
270 | void lttng_ht_add_unique_u64(struct lttng_ht *ht, | |
271 | struct lttng_ht_node_u64 *node) | |
272 | { | |
273 | struct cds_lfht_node *node_ptr; | |
274 | assert(ht); | |
275 | assert(ht->ht); | |
276 | assert(node); | |
277 | ||
278 | node_ptr = cds_lfht_add_unique(ht->ht, | |
279 | ht->hash_fct(&node->key, lttng_ht_seed), ht->match_fct, | |
280 | &node->key, &node->node); | |
281 | assert(node_ptr == &node->node); | |
282 | } | |
283 | ||
702b1ea4 MD |
284 | /* |
285 | * Add replace unsigned long node to hashtable. | |
286 | */ | |
287 | struct lttng_ht_node_ulong *lttng_ht_add_replace_ulong(struct lttng_ht *ht, | |
288 | struct lttng_ht_node_ulong *node) | |
289 | { | |
290 | struct cds_lfht_node *node_ptr; | |
291 | assert(ht); | |
292 | assert(ht->ht); | |
293 | assert(node); | |
294 | ||
295 | node_ptr = cds_lfht_add_replace(ht->ht, | |
b6314938 | 296 | ht->hash_fct((void *) node->key, lttng_ht_seed), ht->match_fct, |
702b1ea4 MD |
297 | (void *) node->key, &node->node); |
298 | if (!node_ptr) { | |
299 | return NULL; | |
300 | } else { | |
301 | return caa_container_of(node_ptr, struct lttng_ht_node_ulong, node); | |
302 | } | |
303 | assert(node_ptr == &node->node); | |
304 | } | |
305 | ||
d88aee68 DG |
306 | /* |
307 | * Add replace unsigned long node to hashtable. | |
308 | */ | |
309 | struct lttng_ht_node_u64 *lttng_ht_add_replace_u64(struct lttng_ht *ht, | |
310 | struct lttng_ht_node_u64 *node) | |
311 | { | |
312 | struct cds_lfht_node *node_ptr; | |
313 | assert(ht); | |
314 | assert(ht->ht); | |
315 | assert(node); | |
316 | ||
317 | node_ptr = cds_lfht_add_replace(ht->ht, | |
318 | ht->hash_fct(&node->key, lttng_ht_seed), ht->match_fct, | |
319 | &node->key, &node->node); | |
320 | if (!node_ptr) { | |
321 | return NULL; | |
322 | } else { | |
323 | return caa_container_of(node_ptr, struct lttng_ht_node_u64, node); | |
324 | } | |
325 | assert(node_ptr == &node->node); | |
326 | } | |
327 | ||
bec39940 DG |
328 | /* |
329 | * Delete node from hashtable. | |
330 | */ | |
331 | int lttng_ht_del(struct lttng_ht *ht, struct lttng_ht_iter *iter) | |
332 | { | |
333 | assert(ht); | |
334 | assert(ht->ht); | |
335 | assert(iter); | |
336 | ||
337 | return cds_lfht_del(ht->ht, iter->iter.node); | |
338 | } | |
339 | ||
340 | /* | |
341 | * Get first node in the hashtable. | |
342 | */ | |
343 | void lttng_ht_get_first(struct lttng_ht *ht, struct lttng_ht_iter *iter) | |
344 | { | |
345 | assert(ht); | |
346 | assert(ht->ht); | |
347 | assert(iter); | |
348 | ||
349 | cds_lfht_first(ht->ht, &iter->iter); | |
350 | } | |
351 | ||
352 | /* | |
353 | * Get next node in the hashtable. | |
354 | */ | |
355 | void lttng_ht_get_next(struct lttng_ht *ht, struct lttng_ht_iter *iter) | |
356 | { | |
357 | assert(ht); | |
358 | assert(ht->ht); | |
359 | assert(iter); | |
360 | ||
361 | cds_lfht_next(ht->ht, &iter->iter); | |
362 | } | |
363 | ||
364 | /* | |
365 | * Return the number of nodes in the hashtable. | |
366 | */ | |
367 | unsigned long lttng_ht_get_count(struct lttng_ht *ht) | |
368 | { | |
369 | long scb, sca; | |
370 | unsigned long count; | |
371 | ||
372 | assert(ht); | |
373 | assert(ht->ht); | |
374 | ||
375 | cds_lfht_count_nodes(ht->ht, &scb, &count, &sca); | |
376 | ||
377 | return count; | |
378 | } | |
379 | ||
380 | /* | |
381 | * Return lttng ht string node from iterator. | |
382 | */ | |
383 | struct lttng_ht_node_str *lttng_ht_iter_get_node_str( | |
384 | struct lttng_ht_iter *iter) | |
385 | { | |
386 | struct cds_lfht_node *node; | |
387 | ||
388 | assert(iter); | |
389 | node = cds_lfht_iter_get_node(&iter->iter); | |
390 | if (!node) { | |
391 | return NULL; | |
392 | } | |
393 | return caa_container_of(node, struct lttng_ht_node_str, node); | |
394 | } | |
395 | ||
396 | /* | |
397 | * Return lttng ht unsigned long node from iterator. | |
398 | */ | |
399 | struct lttng_ht_node_ulong *lttng_ht_iter_get_node_ulong( | |
400 | struct lttng_ht_iter *iter) | |
401 | { | |
402 | struct cds_lfht_node *node; | |
403 | ||
404 | assert(iter); | |
405 | node = cds_lfht_iter_get_node(&iter->iter); | |
406 | if (!node) { | |
407 | return NULL; | |
408 | } | |
409 | return caa_container_of(node, struct lttng_ht_node_ulong, node); | |
410 | } | |
b6314938 | 411 | |
d88aee68 DG |
412 | /* |
413 | * Return lttng ht unsigned long node from iterator. | |
414 | */ | |
415 | struct lttng_ht_node_u64 *lttng_ht_iter_get_node_u64( | |
416 | struct lttng_ht_iter *iter) | |
417 | { | |
418 | struct cds_lfht_node *node; | |
419 | ||
420 | assert(iter); | |
421 | node = cds_lfht_iter_get_node(&iter->iter); | |
422 | if (!node) { | |
423 | return NULL; | |
424 | } | |
425 | return caa_container_of(node, struct lttng_ht_node_u64, node); | |
426 | } | |
427 | ||
b6314938 DG |
428 | /* |
429 | * lib constructor | |
430 | */ | |
d88aee68 | 431 | static void __attribute__((constructor)) _init(void) |
b6314938 DG |
432 | { |
433 | /* Init hash table seed */ | |
434 | lttng_ht_seed = (unsigned long) time(NULL); | |
435 | } |