Fix: compat futex duplicated lock and completion
[urcu.git] / urcu / rculfhash.h
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1#ifndef _URCU_RCULFHASH_H
2#define _URCU_RCULFHASH_H
ab7d5fc6 3
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4/*
5 * urcu/rculfhash.h
6 *
7 * Userspace RCU library - Lock-Free RCU Hash Table
8 *
9 * Copyright 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
0dcf4847 10 * Copyright 2011 - Lai Jiangshan <laijs@cn.fujitsu.com>
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11 *
12 * This library is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU Lesser General Public
14 * License as published by the Free Software Foundation; either
15 * version 2.1 of the License, or (at your option) any later version.
16 *
17 * This library is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * Lesser General Public License for more details.
21 *
22 * You should have received a copy of the GNU Lesser General Public
23 * License along with this library; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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25 *
26 * Include this file _after_ including your URCU flavor.
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27 */
28
674f7a69 29#include <stdint.h>
6d320126 30#include <urcu/compiler.h>
abc490a1 31#include <urcu-call-rcu.h>
7b17c13e 32#include <urcu-flavor.h>
abc490a1 33
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34#ifdef __cplusplus
35extern "C" {
36#endif
37
7f52427b 38/*
04db56f8 39 * cds_lfht_node: Contains the next pointers and reverse-hash
7f52427b 40 * value required for lookup and traversal of the hash table.
04db56f8 41 *
db00ccc3 42 * struct cds_lfht_node should be aligned on 8-bytes boundaries because
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43 * the three lower bits are used as flags. It is worth noting that the
44 * information contained within these three bits could be represented on
45 * two bits by re-using the same bit for REMOVAL_OWNER_FLAG and
46 * BUCKET_FLAG. This can be done if we ensure that no iterator nor
47 * updater check the BUCKET_FLAG after it detects that the REMOVED_FLAG
48 * is set. Given the minimum size of struct cds_lfht_node is 8 bytes on
49 * 32-bit architectures, we choose to go for simplicity and reserve
50 * three bits.
7f52427b 51 *
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52 * struct cds_lfht_node can be embedded into a structure (as a field).
53 * caa_container_of() can be used to get the structure from the struct
54 * cds_lfht_node after a lookup.
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55 *
56 * The structure which embeds it typically holds the key (or key-value
57 * pair) of the object. The caller code is responsible for calculation
58 * of the hash value for cds_lfht APIs.
ae62aa6a 59 */
14044b37 60struct cds_lfht_node {
3f2f3714 61 struct cds_lfht_node *next; /* ptr | REMOVAL_OWNER_FLAG | BUCKET_FLAG | REMOVED_FLAG */
04db56f8 62 unsigned long reverse_hash;
db00ccc3 63} __attribute__((aligned(8)));
abc490a1 64
7f52427b 65/* cds_lfht_iter: Used to track state while traversing a hash chain. */
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66struct cds_lfht_iter {
67 struct cds_lfht_node *node, *next;
68};
69
70static inline
71struct cds_lfht_node *cds_lfht_iter_get_node(struct cds_lfht_iter *iter)
72{
73 return iter->node;
74}
75
14044b37 76struct cds_lfht;
ab7d5fc6 77
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78/*
79 * Caution !
abc490a1 80 * Ensure reader and writer threads are registered as urcu readers.
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81 */
82
996ff57c 83typedef int (*cds_lfht_match_fct)(struct cds_lfht_node *node, const void *key);
abc490a1 84
f0c29ed7 85/*
14044b37 86 * cds_lfht_node_init - initialize a hash table node
0422d92c 87 * @node: the node to initialize.
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88 *
89 * This function is kept to be eventually used for debugging purposes
90 * (detection of memory corruption).
f0c29ed7 91 */
abc490a1 92static inline
04db56f8 93void cds_lfht_node_init(struct cds_lfht_node *node)
abc490a1 94{
abc490a1 95}
674f7a69 96
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97/*
98 * Hash table creation flags.
99 */
100enum {
101 CDS_LFHT_AUTO_RESIZE = (1U << 0),
5afadd12 102 CDS_LFHT_ACCOUNTING = (1U << 1),
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103};
104
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105struct cds_lfht_mm_type {
106 struct cds_lfht *(*alloc_cds_lfht)(unsigned long min_nr_alloc_buckets,
107 unsigned long max_nr_buckets);
108 void (*alloc_bucket_table)(struct cds_lfht *ht, unsigned long order);
109 void (*free_bucket_table)(struct cds_lfht *ht, unsigned long order);
110 struct cds_lfht_node *(*bucket_at)(struct cds_lfht *ht,
111 unsigned long index);
112};
113
114extern const struct cds_lfht_mm_type cds_lfht_mm_order;
308d1cb3 115extern const struct cds_lfht_mm_type cds_lfht_mm_chunk;
b0b55251 116extern const struct cds_lfht_mm_type cds_lfht_mm_mmap;
0b6aa001 117
674f7a69 118/*
7a9dcf9b 119 * _cds_lfht_new - API used by cds_lfht_new wrapper. Do not use directly.
674f7a69 120 */
b9c27904 121extern
0422d92c 122struct cds_lfht *_cds_lfht_new(unsigned long init_size,
0722081a 123 unsigned long min_nr_alloc_buckets,
747d725c 124 unsigned long max_nr_buckets,
b8af5011 125 int flags,
0b6aa001 126 const struct cds_lfht_mm_type *mm,
7b17c13e 127 const struct rcu_flavor_struct *flavor,
b7d619b0 128 pthread_attr_t *attr);
ab7d5fc6 129
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130/*
131 * cds_lfht_new - allocate a hash table.
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132 * @init_size: number of buckets to allocate initially. Must be power of two.
133 * @min_nr_alloc_buckets: the minimum number of allocated buckets.
134 * (must be power of two)
135 * @max_nr_buckets: the maximum number of hash table buckets allowed.
136 * (must be power of two)
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137 * @flags: hash table creation flags (can be combined with bitwise or: '|').
138 * 0: no flags.
139 * CDS_LFHT_AUTO_RESIZE: automatically resize hash table.
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140 * CDS_LFHT_ACCOUNTING: count the number of node addition
141 * and removal in the table
b7d619b0 142 * @attr: optional resize worker thread attributes. NULL for default.
7a9dcf9b 143 *
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144 * Return NULL on error.
145 * Note: the RCU flavor must be already included before the hash table header.
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146 *
147 * The programmer is responsible for ensuring that resize operation has a
148 * priority equal to hash table updater threads. It should be performed by
149 * specifying the appropriate priority in the pthread "attr" argument, and,
150 * for CDS_LFHT_AUTO_RESIZE, by ensuring that call_rcu worker threads also have
151 * this priority level. Having lower priority for call_rcu and resize threads
152 * does not pose any correctness issue, but the resize operations could be
153 * starved by updates, thus leading to long hash table bucket chains.
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154 * Threads calling cds_lfht_new are NOT required to be registered RCU
155 * read-side threads. It can be called very early. (e.g. before RCU is
156 * initialized)
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157 */
158static inline
0422d92c 159struct cds_lfht *cds_lfht_new(unsigned long init_size,
0722081a 160 unsigned long min_nr_alloc_buckets,
747d725c 161 unsigned long max_nr_buckets,
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162 int flags,
163 pthread_attr_t *attr)
7a9dcf9b 164{
7b17c13e 165 return _cds_lfht_new(init_size, min_nr_alloc_buckets, max_nr_buckets,
c1888f3a 166 flags, NULL, &rcu_flavor, attr);
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167}
168
f0c29ed7 169/*
14044b37 170 * cds_lfht_destroy - destroy a hash table.
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171 * @ht: the hash table to destroy.
172 * @attr: (output) resize worker thread attributes, as received by cds_lfht_new.
173 * The caller will typically want to free this pointer if dynamically
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174 * allocated. The attr point can be NULL if the caller does not
175 * need to be informed of the value passed to cds_lfht_new().
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176 *
177 * Return 0 on success, negative error value on error.
3df0c49c 178 * Threads calling this API need to be registered RCU read-side threads.
96914388 179 * cds_lfht_destroy should *not* be called from a RCU read-side critical
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180 * section. It should *not* be called from a call_rcu thread context
181 * neither.
f0c29ed7 182 */
b9c27904 183extern
b7d619b0 184int cds_lfht_destroy(struct cds_lfht *ht, pthread_attr_t **attr);
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185
186/*
14044b37 187 * cds_lfht_count_nodes - count the number of nodes in the hash table.
7f52427b 188 * @ht: the hash table.
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189 * @split_count_before: sample the node count split-counter before traversal.
190 * @count: traverse the hash table, count the number of nodes observed.
191 * @split_count_after: sample the node count split-counter after traversal.
0422d92c 192 *
f0c29ed7 193 * Call with rcu_read_lock held.
3df0c49c 194 * Threads calling this API need to be registered RCU read-side threads.
f0c29ed7 195 */
b9c27904 196extern
14044b37 197void cds_lfht_count_nodes(struct cds_lfht *ht,
7f52427b 198 long *split_count_before,
adc0de68 199 unsigned long *count,
7f52427b 200 long *split_count_after);
ab7d5fc6 201
f0c29ed7 202/*
14044b37 203 * cds_lfht_lookup - lookup a node by key.
0422d92c 204 * @ht: the hash table.
0422d92c 205 * @hash: the key hash.
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206 * @match: the key match function.
207 * @key: the current node key.
3a9c66db 208 * @iter: node, if found (output). *iter->node set to NULL if not found.
f0c29ed7 209 *
f0c29ed7 210 * Call with rcu_read_lock held.
3df0c49c 211 * Threads calling this API need to be registered RCU read-side threads.
7b783f81 212 * This function acts as a rcu_dereference() to read the node pointer.
f0c29ed7 213 */
b9c27904 214extern
6f554439 215void cds_lfht_lookup(struct cds_lfht *ht, unsigned long hash,
996ff57c 216 cds_lfht_match_fct match, const void *key,
6f554439 217 struct cds_lfht_iter *iter);
ab7d5fc6 218
f0c29ed7 219/*
3a9c66db 220 * cds_lfht_next_duplicate - get the next item with same key, after iterator.
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221 * @ht: the hash table.
222 * @match: the key match function.
04db56f8 223 * @key: the current node key.
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224 * @iter: input: current iterator.
225 * output: node, if found. *iter->node set to NULL if not found.
f0c29ed7 226 *
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227 * Uses an iterator initialized by a lookup or traversal. Important: the
228 * iterator _needs_ to be initialized before calling
229 * cds_lfht_next_duplicate.
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230 * Sets *iter-node to the following node with same key.
231 * Sets *iter->node to NULL if no following node exists with same key.
232 * RCU read-side lock must be held across cds_lfht_lookup and
233 * cds_lfht_next calls, and also between cds_lfht_next calls using the
234 * node returned by a previous cds_lfht_next.
235 * Call with rcu_read_lock held.
3df0c49c 236 * Threads calling this API need to be registered RCU read-side threads.
7b783f81 237 * This function acts as a rcu_dereference() to read the node pointer.
f0c29ed7 238 */
b9c27904 239extern
0422d92c 240void cds_lfht_next_duplicate(struct cds_lfht *ht,
996ff57c 241 cds_lfht_match_fct match, const void *key,
04db56f8 242 struct cds_lfht_iter *iter);
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243
244/*
245 * cds_lfht_first - get the first node in the table.
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246 * @ht: the hash table.
247 * @iter: First node, if exists (output). *iter->node set to NULL if not found.
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248 *
249 * Output in "*iter". *iter->node set to NULL if table is empty.
250 * Call with rcu_read_lock held.
3df0c49c 251 * Threads calling this API need to be registered RCU read-side threads.
7b783f81 252 * This function acts as a rcu_dereference() to read the node pointer.
4e9b9fbf 253 */
b9c27904 254extern
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255void cds_lfht_first(struct cds_lfht *ht, struct cds_lfht_iter *iter);
256
257/*
258 * cds_lfht_next - get the next node in the table.
0422d92c 259 * @ht: the hash table.
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260 * @iter: input: current iterator.
261 * output: next node, if exists. *iter->node set to NULL if not found.
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262 *
263 * Input/Output in "*iter". *iter->node set to NULL if *iter was
264 * pointing to the last table node.
265 * Call with rcu_read_lock held.
3df0c49c 266 * Threads calling this API need to be registered RCU read-side threads.
7b783f81 267 * This function acts as a rcu_dereference() to read the node pointer.
4e9b9fbf 268 */
b9c27904 269extern
4e9b9fbf 270void cds_lfht_next(struct cds_lfht *ht, struct cds_lfht_iter *iter);
ab7d5fc6 271
18117871 272/*
14044b37 273 * cds_lfht_add - add a node to the hash table.
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274 * @ht: the hash table.
275 * @hash: the key hash.
276 * @node: the node to add.
f0c29ed7 277 *
48ed1c18 278 * This function supports adding redundant keys into the table.
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279 * Call with rcu_read_lock held.
280 * Threads calling this API need to be registered RCU read-side threads.
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281 * This function issues a full memory barrier before and after its
282 * atomic commit.
f0c29ed7 283 */
b9c27904 284extern
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285void cds_lfht_add(struct cds_lfht *ht, unsigned long hash,
286 struct cds_lfht_node *node);
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287
288/*
14044b37 289 * cds_lfht_add_unique - add a node to hash table, if key is not present.
0422d92c 290 * @ht: the hash table.
6f554439 291 * @hash: the node's hash.
0422d92c 292 * @match: the key match function.
04db56f8 293 * @key: the node's key.
0422d92c 294 * @node: the node to try adding.
f0c29ed7 295 *
6878c72b 296 * Return the node added upon success.
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297 * Return the unique node already present upon failure. If
298 * cds_lfht_add_unique fails, the node passed as parameter should be
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299 * freed by the caller. In this case, the caller does NOT need to wait
300 * for a grace period before freeing the node.
f0c29ed7 301 * Call with rcu_read_lock held.
3df0c49c 302 * Threads calling this API need to be registered RCU read-side threads.
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303 *
304 * The semantic of this function is that if only this function is used
305 * to add keys into the table, no duplicated keys should ever be
306 * observable in the table. The same guarantee apply for combination of
9357c415 307 * add_unique and add_replace (see below).
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308 *
309 * Upon success, this function issues a full memory barrier before and
310 * after its atomic commit. Upon failure, this function acts like a
311 * simple lookup operation: it acts as a rcu_dereference() to read the
312 * node pointer. The failure case does not guarantee any other memory
313 * barrier.
18117871 314 */
b9c27904 315extern
adc0de68 316struct cds_lfht_node *cds_lfht_add_unique(struct cds_lfht *ht,
6f554439 317 unsigned long hash,
0422d92c 318 cds_lfht_match_fct match,
996ff57c 319 const void *key,
adc0de68 320 struct cds_lfht_node *node);
3eca1b8c 321
48ed1c18 322/*
9357c415 323 * cds_lfht_add_replace - replace or add a node within hash table.
0422d92c 324 * @ht: the hash table.
6f554439 325 * @hash: the node's hash.
0422d92c 326 * @match: the key match function.
04db56f8 327 * @key: the node's key.
0422d92c 328 * @node: the node to add.
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329 *
330 * Return the node replaced upon success. If no node matching the key
331 * was present, return NULL, which also means the operation succeeded.
332 * This replacement operation should never fail.
333 * Call with rcu_read_lock held.
3df0c49c 334 * Threads calling this API need to be registered RCU read-side threads.
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335 * After successful replacement, a grace period must be waited for before
336 * freeing the memory reserved for the returned node.
337 *
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338 * The semantic of replacement vs lookups and traversals is the
339 * following: if lookups and traversals are performed between a key
340 * unique insertion and its removal, we guarantee that the lookups and
341 * traversals will always find exactly one instance of the key if it is
342 * replaced concurrently with the lookups.
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343 *
344 * Providing this semantic allows us to ensure that replacement-only
345 * schemes will never generate duplicated keys. It also allows us to
9357c415 346 * guarantee that a combination of add_replace and add_unique updates
48ed1c18 347 * will never generate duplicated keys.
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348 *
349 * This function issues a full memory barrier before and after its
350 * atomic commit.
48ed1c18 351 */
b9c27904 352extern
9357c415 353struct cds_lfht_node *cds_lfht_add_replace(struct cds_lfht *ht,
6f554439 354 unsigned long hash,
0422d92c 355 cds_lfht_match_fct match,
996ff57c 356 const void *key,
adc0de68 357 struct cds_lfht_node *node);
48ed1c18 358
f0c29ed7 359/*
929ad508 360 * cds_lfht_replace - replace a node pointed to by iter within hash table.
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361 * @ht: the hash table.
362 * @old_iter: the iterator position of the node to replace.
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363 * @hash: the node's hash.
364 * @match: the key match function.
365 * @key: the node's key.
366 * @new_node: the new node to use as replacement.
f0c29ed7 367 *
9357c415 368 * Return 0 if replacement is successful, negative value otherwise.
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369 * Replacing a NULL old node or an already removed node will fail with
370 * -ENOENT.
371 * If the hash or value of the node to replace and the new node differ,
372 * this function returns -EINVAL without proceeding to the replacement.
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373 * Old node can be looked up with cds_lfht_lookup and cds_lfht_next.
374 * RCU read-side lock must be held between lookup and replacement.
375 * Call with rcu_read_lock held.
3df0c49c 376 * Threads calling this API need to be registered RCU read-side threads.
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377 * After successful replacement, a grace period must be waited for before
378 * freeing the memory reserved for the old node (which can be accessed
379 * with cds_lfht_iter_get_node).
380 *
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381 * The semantic of replacement vs lookups is the same as
382 * cds_lfht_add_replace().
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383 *
384 * Upon success, this function issues a full memory barrier before and
385 * after its atomic commit. Upon failure, this function does not issue
386 * any memory barrier.
9357c415 387 */
b9c27904 388extern
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389int cds_lfht_replace(struct cds_lfht *ht,
390 struct cds_lfht_iter *old_iter,
391 unsigned long hash,
392 cds_lfht_match_fct match,
393 const void *key,
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394 struct cds_lfht_node *new_node);
395
396/*
397 * cds_lfht_del - remove node pointed to by iterator from hash table.
0422d92c 398 * @ht: the hash table.
bc8c3c74 399 * @node: the node to delete.
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400 *
401 * Return 0 if the node is successfully removed, negative value
402 * otherwise.
bc8c3c74 403 * Deleting a NULL node or an already removed node will fail with a
9357c415 404 * negative value.
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405 * Node can be looked up with cds_lfht_lookup and cds_lfht_next,
406 * followed by use of cds_lfht_iter_get_node.
9357c415 407 * RCU read-side lock must be held between lookup and removal.
f0c29ed7 408 * Call with rcu_read_lock held.
3df0c49c 409 * Threads calling this API need to be registered RCU read-side threads.
48ed1c18 410 * After successful removal, a grace period must be waited for before
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411 * freeing the memory reserved for old node (which can be accessed with
412 * cds_lfht_iter_get_node).
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413 * Upon success, this function issues a full memory barrier before and
414 * after its atomic commit. Upon failure, this function does not issue
415 * any memory barrier.
f0c29ed7 416 */
b9c27904 417extern
bc8c3c74 418int cds_lfht_del(struct cds_lfht *ht, struct cds_lfht_node *node);
ab7d5fc6 419
df55172a 420/*
3a9c66db 421 * cds_lfht_is_node_deleted - query whether a node is removed from hash table.
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422 *
423 * Return non-zero if the node is deleted from the hash table, 0
424 * otherwise.
425 * Node can be looked up with cds_lfht_lookup and cds_lfht_next,
426 * followed by use of cds_lfht_iter_get_node.
427 * RCU read-side lock must be held between lookup and call to this
428 * function.
429 * Call with rcu_read_lock held.
430 * Threads calling this API need to be registered RCU read-side threads.
7b783f81 431 * This function does not issue any memory barrier.
df55172a 432 */
b9c27904 433extern
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434int cds_lfht_is_node_deleted(struct cds_lfht_node *node);
435
f0c29ed7 436/*
14044b37 437 * cds_lfht_resize - Force a hash table resize
0422d92c 438 * @ht: the hash table.
1475579c 439 * @new_size: update to this hash table size.
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440 *
441 * Threads calling this API need to be registered RCU read-side threads.
7b783f81 442 * This function does not (necessarily) issue memory barriers.
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443 * cds_lfht_resize should *not* be called from a RCU read-side critical
444 * section.
f0c29ed7 445 */
b9c27904 446extern
1475579c 447void cds_lfht_resize(struct cds_lfht *ht, unsigned long new_size);
464a1ec9 448
6d320126 449/*
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450 * Note: it is safe to perform element removal (del), replacement, or
451 * any hash table update operation during any of the following hash
452 * table traversals.
7b783f81 453 * These functions act as rcu_dereference() to read the node pointers.
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454 */
455#define cds_lfht_for_each(ht, iter, node) \
456 for (cds_lfht_first(ht, iter), \
457 node = cds_lfht_iter_get_node(iter); \
458 node != NULL; \
459 cds_lfht_next(ht, iter), \
460 node = cds_lfht_iter_get_node(iter))
461
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462#define cds_lfht_for_each_duplicate(ht, hash, match, key, iter, node) \
463 for (cds_lfht_lookup(ht, hash, match, key, iter), \
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464 node = cds_lfht_iter_get_node(iter); \
465 node != NULL; \
466 cds_lfht_next_duplicate(ht, match, key, iter), \
467 node = cds_lfht_iter_get_node(iter))
468
469#define cds_lfht_for_each_entry(ht, iter, pos, member) \
470 for (cds_lfht_first(ht, iter), \
471 pos = caa_container_of(cds_lfht_iter_get_node(iter), \
bdffa73a 472 __typeof__(*(pos)), member); \
0b0627bf 473 &(pos)->member != NULL; \
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474 cds_lfht_next(ht, iter), \
475 pos = caa_container_of(cds_lfht_iter_get_node(iter), \
bdffa73a 476 __typeof__(*(pos)), member))
6d320126 477
6f554439 478#define cds_lfht_for_each_entry_duplicate(ht, hash, match, key, \
6d320126 479 iter, pos, member) \
6f554439 480 for (cds_lfht_lookup(ht, hash, match, key, iter), \
6d320126 481 pos = caa_container_of(cds_lfht_iter_get_node(iter), \
bdffa73a 482 __typeof__(*(pos)), member); \
0b0627bf 483 &(pos)->member != NULL; \
6d320126
MD
484 cds_lfht_next_duplicate(ht, match, key, iter), \
485 pos = caa_container_of(cds_lfht_iter_get_node(iter), \
bdffa73a 486 __typeof__(*(pos)), member))
6d320126 487
01389791
MD
488#ifdef __cplusplus
489}
490#endif
491
a42cc659 492#endif /* _URCU_RCULFHASH_H */
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