1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
/*****************************************************************************
Copyright (c) 1997, 2009, Innobase Oy. All Rights Reserved.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA
*****************************************************************************/
/******************************************************
The simple hash table utility
Created 5/20/1997 Heikki Tuuri
*******************************************************/
#include "hash0hash.h"
#ifdef UNIV_NONINL
#include "hash0hash.ic"
#endif
#include "mem0mem.h"
/****************************************************************
Reserves the mutex for a fold value in a hash table. */
UNIV_INTERN
void
hash_mutex_enter(
/*=============*/
hash_table_t* table, /* in: hash table */
ulint fold) /* in: fold */
{
mutex_enter(hash_get_mutex(table, fold));
}
/****************************************************************
Releases the mutex for a fold value in a hash table. */
UNIV_INTERN
void
hash_mutex_exit(
/*============*/
hash_table_t* table, /* in: hash table */
ulint fold) /* in: fold */
{
mutex_exit(hash_get_mutex(table, fold));
}
/****************************************************************
Reserves all the mutexes of a hash table, in an ascending order. */
UNIV_INTERN
void
hash_mutex_enter_all(
/*=================*/
hash_table_t* table) /* in: hash table */
{
ulint i;
for (i = 0; i < table->n_mutexes; i++) {
mutex_enter(table->mutexes + i);
}
}
/****************************************************************
Releases all the mutexes of a hash table. */
UNIV_INTERN
void
hash_mutex_exit_all(
/*================*/
hash_table_t* table) /* in: hash table */
{
ulint i;
for (i = 0; i < table->n_mutexes; i++) {
mutex_exit(table->mutexes + i);
}
}
/*****************************************************************
Creates a hash table with >= n array cells. The actual number of cells is
chosen to be a prime number slightly bigger than n. */
UNIV_INTERN
hash_table_t*
hash_create(
/*========*/
/* out, own: created table */
ulint n) /* in: number of array cells */
{
hash_cell_t* array;
ulint prime;
hash_table_t* table;
prime = ut_find_prime(n);
table = mem_alloc(sizeof(hash_table_t));
array = ut_malloc(sizeof(hash_cell_t) * prime);
#if defined UNIV_AHI_DEBUG || defined UNIV_DEBUG
table->adaptive = FALSE;
#endif /* UNIV_AHI_DEBUG || UNIV_DEBUG */
table->array = array;
table->n_cells = prime;
table->n_mutexes = 0;
table->mutexes = NULL;
table->heaps = NULL;
table->heap = NULL;
table->magic_n = HASH_TABLE_MAGIC_N;
/* Initialize the cell array */
hash_table_clear(table);
return(table);
}
/*****************************************************************
Frees a hash table. */
UNIV_INTERN
void
hash_table_free(
/*============*/
hash_table_t* table) /* in, own: hash table */
{
ut_a(table->mutexes == NULL);
ut_free(table->array);
mem_free(table);
}
/*****************************************************************
Creates a mutex array to protect a hash table. */
UNIV_INTERN
void
hash_create_mutexes_func(
/*=====================*/
hash_table_t* table, /* in: hash table */
#ifdef UNIV_SYNC_DEBUG
ulint sync_level, /* in: latching order level of the
mutexes: used in the debug version */
#endif /* UNIV_SYNC_DEBUG */
ulint n_mutexes) /* in: number of mutexes, must be a
power of 2 */
{
ulint i;
ut_a(n_mutexes > 0);
ut_a(ut_is_2pow(n_mutexes));
table->mutexes = mem_alloc(n_mutexes * sizeof(mutex_t));
for (i = 0; i < n_mutexes; i++) {
mutex_create(table->mutexes + i, sync_level);
}
table->n_mutexes = n_mutexes;
}
|