Fix: waiter: futex wait: handle spurious futex wakeups
[lttng-tools.git] / src / common / hashtable / hashtable.hpp
1 /*
2 * Copyright (C) 2011 EfficiOS Inc.
3 *
4 * SPDX-License-Identifier: GPL-2.0-only
5 *
6 */
7
8 #ifndef _LTT_HT_H
9 #define _LTT_HT_H
10
11 #include <urcu.h>
12 #include <stdint.h>
13 #include <memory>
14
15 #include <common/macros.hpp>
16 #include <lttng/lttng-export.h>
17 #include <urcu/rculfhash.h>
18
19 LTTNG_EXPORT extern unsigned long lttng_ht_seed;
20
21 typedef unsigned long (*hash_fct_type)(const void *_key, unsigned long seed);
22 typedef cds_lfht_match_fct hash_match_fct;
23
24 enum lttng_ht_type {
25 LTTNG_HT_TYPE_STRING,
26 LTTNG_HT_TYPE_ULONG,
27 LTTNG_HT_TYPE_U64,
28 LTTNG_HT_TYPE_TWO_U64,
29 };
30
31 struct lttng_ht_deleter;
32
33 struct lttng_ht {
34 using uptr = std::unique_ptr<lttng_ht, lttng_ht_deleter>;
35 struct cds_lfht *ht;
36 cds_lfht_match_fct match_fct;
37 hash_fct_type hash_fct;
38 };
39
40 struct lttng_ht_iter {
41 struct cds_lfht_iter iter;
42 };
43
44 struct lttng_ht_node_str {
45 char *key;
46 struct cds_lfht_node node;
47 struct rcu_head head;
48 };
49
50 struct lttng_ht_node_ulong {
51 unsigned long key;
52 struct cds_lfht_node node;
53 struct rcu_head head;
54 };
55
56 struct lttng_ht_node_u64 {
57 uint64_t key;
58 struct cds_lfht_node node;
59 struct rcu_head head;
60 };
61
62 struct lttng_ht_two_u64 {
63 uint64_t key1;
64 uint64_t key2;
65 };
66
67 struct lttng_ht_node_two_u64 {
68 struct lttng_ht_two_u64 key;
69 struct cds_lfht_node node;
70 struct rcu_head head;
71 };
72
73 /* Hashtable new and destroy */
74 struct lttng_ht *lttng_ht_new(unsigned long size, enum lttng_ht_type type);
75 void lttng_ht_destroy(struct lttng_ht *ht);
76 struct lttng_ht_deleter {
77 void operator()(lttng_ht *ht) { lttng_ht_destroy(ht); };
78 };
79
80 /* Specialized node init and free functions */
81 void lttng_ht_node_init_str(struct lttng_ht_node_str *node, char *key);
82 void lttng_ht_node_init_ulong(struct lttng_ht_node_ulong *node,
83 unsigned long key);
84 void lttng_ht_node_init_u64(struct lttng_ht_node_u64 *node,
85 uint64_t key);
86 void lttng_ht_node_init_two_u64(struct lttng_ht_node_two_u64 *node,
87 uint64_t key1, uint64_t key2);
88 void lttng_ht_node_free_str(struct lttng_ht_node_str *node);
89 void lttng_ht_node_free_ulong(struct lttng_ht_node_ulong *node);
90 void lttng_ht_node_free_u64(struct lttng_ht_node_u64 *node);
91 void lttng_ht_node_free_two_u64(struct lttng_ht_node_two_u64 *node);
92
93 void lttng_ht_lookup(struct lttng_ht *ht, const void *key,
94 struct lttng_ht_iter *iter);
95
96 /* Specialized add unique functions */
97 void lttng_ht_add_unique_str(struct lttng_ht *ht,
98 struct lttng_ht_node_str *node);
99 void lttng_ht_add_unique_ulong(struct lttng_ht *ht,
100 struct lttng_ht_node_ulong *node);
101 void lttng_ht_add_unique_u64(struct lttng_ht *ht,
102 struct lttng_ht_node_u64 *node);
103 void lttng_ht_add_unique_two_u64(struct lttng_ht *ht,
104 struct lttng_ht_node_two_u64 *node);
105 struct lttng_ht_node_ulong *lttng_ht_add_replace_ulong(
106 struct lttng_ht *ht, struct lttng_ht_node_ulong *node);
107 struct lttng_ht_node_u64 *lttng_ht_add_replace_u64(
108 struct lttng_ht *ht, struct lttng_ht_node_u64 *node);
109 void lttng_ht_add_str(struct lttng_ht *ht,
110 struct lttng_ht_node_str *node);
111 void lttng_ht_add_ulong(struct lttng_ht *ht,
112 struct lttng_ht_node_ulong *node);
113 void lttng_ht_add_u64(struct lttng_ht *ht,
114 struct lttng_ht_node_u64 *node);
115
116 int lttng_ht_del(struct lttng_ht *ht, struct lttng_ht_iter *iter);
117
118 void lttng_ht_get_first(struct lttng_ht *ht,
119 struct lttng_ht_iter *iter);
120 void lttng_ht_get_next(struct lttng_ht *ht, struct lttng_ht_iter *iter);
121
122 unsigned long lttng_ht_get_count(struct lttng_ht *ht);
123
124 struct lttng_ht_node_str *lttng_ht_iter_get_node_str(
125 struct lttng_ht_iter *iter);
126 struct lttng_ht_node_ulong *lttng_ht_iter_get_node_ulong(
127 struct lttng_ht_iter *iter);
128 struct lttng_ht_node_u64 *lttng_ht_iter_get_node_u64(
129 struct lttng_ht_iter *iter);
130 struct lttng_ht_node_two_u64 *lttng_ht_iter_get_node_two_u64(
131 struct lttng_ht_iter *iter);
132
133 #endif /* _LTT_HT_H */
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