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
|
/* Copyright (c) 2000, 2025, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is designed to work with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have either included with
the program or referenced in the documentation.
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, version 2.0, 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/* open a heap-database */
#include <errno.h>
#include <sys/types.h>
#include "my_dbug.h"
#include "my_inttypes.h"
#include "my_sys.h"
#include "mysql/service_mysql_alloc.h"
#include "storage/heap/heapdef.h"
/*
Open heap table based on HP_SHARE structure
NOTE
This doesn't register the table in the open table list.
*/
HP_INFO *heap_open_from_share(HP_SHARE *share, int mode) {
HP_INFO *info;
DBUG_TRACE;
if (!(info = (HP_INFO *)my_malloc(
hp_key_memory_HP_INFO,
(uint)sizeof(HP_INFO) + 2 * share->max_key_length,
MYF(MY_ZEROFILL)))) {
return nullptr;
}
share->open_count++;
/*
Don't initialize THR_LOCK_DATA for internal temporary tables as it
is not used for them anyway (and THR_LOCK is not initialized for them
too).
*/
if (share->open_list.data != nullptr)
thr_lock_data_init(&share->lock, &info->lock, nullptr);
info->s = share;
info->lastkey = (uchar *)(info + 1);
info->recbuf = (uchar *)(info->lastkey + share->max_key_length);
info->mode = mode;
info->current_record = (ulong)~0L; /* No current record */
info->lastinx = info->errkey = -1;
#ifndef NDEBUG
info->opt_flag = READ_CHECK_USED; /* Check when changing */
#endif
DBUG_PRINT("exit", ("heap: %p reclength: %d records_in_block: %d", info,
share->reclength, share->block.records_in_block));
return info;
}
/*
Open heap table based on HP_SHARE structure and register it
*/
HP_INFO *heap_open_from_share_and_register(HP_SHARE *share, int mode) {
HP_INFO *info;
DBUG_TRACE;
mysql_mutex_lock(&THR_LOCK_heap);
if ((info = heap_open_from_share(share, mode))) {
info->open_list.data = (void *)info;
heap_open_list = list_add(heap_open_list, &info->open_list);
/* Unpin the share, it is now pinned by the file. */
share->open_count--;
}
mysql_mutex_unlock(&THR_LOCK_heap);
return info;
}
/**
Dereference a HEAP share and free it if it's not referenced.
We needn't check open_count for single instances.
*/
void heap_release_share(HP_SHARE *share, bool single_instance) {
/* Couldn't open table; Remove the newly created table */
if (single_instance)
hp_free(share);
else {
mysql_mutex_lock(&THR_LOCK_heap);
if (--share->open_count == 0) hp_free(share);
mysql_mutex_unlock(&THR_LOCK_heap);
}
}
/*
Open heap table based on name
NOTE
This register the table in the open table list. so that it can be
found by future heap_open() calls.
*/
HP_INFO *heap_open(const char *name, int mode) {
HP_INFO *info;
HP_SHARE *share;
DBUG_TRACE;
mysql_mutex_lock(&THR_LOCK_heap);
if (!(share = hp_find_named_heap(name))) {
set_my_errno(ENOENT);
mysql_mutex_unlock(&THR_LOCK_heap);
return nullptr;
}
if ((info = heap_open_from_share(share, mode))) {
info->open_list.data = (void *)info;
heap_open_list = list_add(heap_open_list, &info->open_list);
}
mysql_mutex_unlock(&THR_LOCK_heap);
return info;
}
/* map name to a heap-nr. If name isn't found return 0 */
HP_SHARE *hp_find_named_heap(const char *name) {
LIST *pos;
HP_SHARE *info;
DBUG_TRACE;
DBUG_PRINT("enter", ("name: %s", name));
for (pos = heap_share_list; pos; pos = pos->next) {
info = (HP_SHARE *)pos->data;
if (!strcmp(name, info->name)) {
DBUG_PRINT("exit", ("Old heap_database: %p", info));
return info;
}
}
return (HP_SHARE *)nullptr;
}
|
