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
|
/******************************************************
The simple hash table utility
(c) 1997 Innobase Oy
Created 5/20/1997 Heikki Tuuri
*******************************************************/
#include "ut0rnd.h"
/****************************************************************
Gets the nth cell in a hash table. */
UNIV_INLINE
hash_cell_t*
hash_get_nth_cell(
/*==============*/
/* out: pointer to cell */
hash_table_t* table, /* in: hash table */
ulint n) /* in: cell index */
{
ut_ad(n < table->n_cells);
return(table->array + n);
}
/*****************************************************************
Returns the number of cells in a hash table. */
UNIV_INLINE
ulint
hash_get_n_cells(
/*=============*/
/* out: number of cells */
hash_table_t* table) /* in: table */
{
return(table->n_cells);
}
/******************************************************************
Calculates the hash value from a folded value. */
UNIV_INLINE
ulint
hash_calc_hash(
/*===========*/
/* out: hashed value */
ulint fold, /* in: folded value */
hash_table_t* table) /* in: hash table */
{
return(ut_hash_ulint(fold, table->n_cells));
}
/****************************************************************
Gets the mutex index for a fold value in a hash table. */
UNIV_INLINE
ulint
hash_get_mutex_no(
/*==============*/
/* out: mutex number */
hash_table_t* table, /* in: hash table */
ulint fold) /* in: fold */
{
return(ut_2pow_remainder(fold, table->n_mutexes));
}
/****************************************************************
Gets the nth heap in a hash table. */
UNIV_INLINE
mem_heap_t*
hash_get_nth_heap(
/*==============*/
/* out: mem heap */
hash_table_t* table, /* in: hash table */
ulint i) /* in: index of the heap */
{
ut_ad(i < table->n_mutexes);
return(table->heaps[i]);
}
/****************************************************************
Gets the heap for a fold value in a hash table. */
UNIV_INLINE
mem_heap_t*
hash_get_heap(
/*==========*/
/* out: mem heap */
hash_table_t* table, /* in: hash table */
ulint fold) /* in: fold */
{
ulint i;
if (table->heap) {
return(table->heap);
}
i = hash_get_mutex_no(table, fold);
return(hash_get_nth_heap(table, i));
}
/****************************************************************
Gets the nth mutex in a hash table. */
UNIV_INLINE
mutex_t*
hash_get_nth_mutex(
/*===============*/
/* out: mutex */
hash_table_t* table, /* in: hash table */
ulint i) /* in: index of the mutex */
{
ut_ad(i < table->n_mutexes);
return(table->mutexes + i);
}
/****************************************************************
Gets the mutex for a fold value in a hash table. */
UNIV_INLINE
mutex_t*
hash_get_mutex(
/*===========*/
/* out: mutex */
hash_table_t* table, /* in: hash table */
ulint fold) /* in: fold */
{
ulint i;
i = hash_get_mutex_no(table, fold);
return(hash_get_nth_mutex(table, i));
}
|