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
|
/* Copyright (c) 2000, 2011, Oracle and/or its affiliates. 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/* open a heap-database */
#include "heapdef.h"
#include "my_sys.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_ENTER("heap_open_from_share");
if (!(info= (HP_INFO*) my_malloc((uint) sizeof(HP_INFO) +
2 * share->max_key_length,
MYF(MY_ZEROFILL))))
{
DBUG_RETURN(0);
}
share->open_count++;
thr_lock_data_init(&share->lock,&info->lock,NULL);
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 DBUG_OFF
info->opt_flag= READ_CHECK_USED; /* Check when changing */
#endif
DBUG_PRINT("exit",("heap: 0x%lx reclength: %d records_in_block: %d",
(long) info, share->reclength,
share->block.records_in_block));
DBUG_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_ENTER("heap_open_from_share_and_register");
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);
DBUG_RETURN(info);
}
/**
Dereference a HEAP share and free it if it's not referenced.
We don't check open_count for internal tables since they
are always thread-local, i.e. referenced by a single thread.
*/
void heap_release_share(HP_SHARE *share, my_bool internal_table)
{
/* Couldn't open table; Remove the newly created table */
if (internal_table)
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_ENTER("heap_open");
mysql_mutex_lock(&THR_LOCK_heap);
if (!(share= hp_find_named_heap(name)))
{
my_errno= ENOENT;
mysql_mutex_unlock(&THR_LOCK_heap);
DBUG_RETURN(0);
}
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);
DBUG_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_ENTER("heap_find");
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: 0x%lx", (long) info));
DBUG_RETURN(info);
}
}
DBUG_RETURN((HP_SHARE *) 0);
}
|
