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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
/* Copyright (c) 2012, 2023, 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 also distributed 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 included with MySQL.
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,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
/**
@file storage/perfschema/table_md_locks.cc
Table METADATA_LOCKS (implementation).
*/
#include "my_global.h"
#include "my_thread.h"
#include "pfs_instr.h"
#include "pfs_column_types.h"
#include "pfs_column_values.h"
#include "table_md_locks.h"
#include "pfs_global.h"
#include "pfs_buffer_container.h"
#include "field.h"
THR_LOCK table_metadata_locks::m_table_lock;
PFS_engine_table_share_state
table_metadata_locks::m_share_state = {
false /* m_checked */
};
PFS_engine_table_share
table_metadata_locks::m_share=
{
{ C_STRING_WITH_LEN("metadata_locks") },
&pfs_readonly_acl,
table_metadata_locks::create,
NULL, /* write_row */
NULL, /* delete_all_rows */
table_metadata_locks::get_row_count,
sizeof(PFS_simple_index),
&m_table_lock,
{ C_STRING_WITH_LEN("CREATE TABLE metadata_locks("
"OBJECT_TYPE VARCHAR(64) not null comment 'Object type. One of BACKUP, COMMIT, EVENT, FUNCTION, GLOBAL, LOCKING SERVICE, PROCEDURE, SCHEMA, TABLE, TABLESPACE, TRIGGER (unused) or USER LEVEL LOCK.',"
"OBJECT_SCHEMA VARCHAR(64) comment 'Object schema.',"
"OBJECT_NAME VARCHAR(64) comment 'Object name.',"
"OBJECT_INSTANCE_BEGIN BIGINT unsigned not null comment 'Address in memory of the instrumented object.',"
"LOCK_TYPE VARCHAR(32) not null comment 'Lock type. One of BACKUP_FTWRL1, BACKUP_START, BACKUP_TRANS_DML, EXCLUSIVE, INTENTION_EXCLUSIVE, SHARED, SHARED_HIGH_PRIO, SHARED_NO_READ_WRITE, SHARED_NO_WRITE, SHARED_READ, SHARED_UPGRADABLE or SHARED_WRITE.',"
"LOCK_DURATION VARCHAR(32) not null comment 'Lock duration. One of EXPLICIT (locks released by explicit action, for example a global lock acquired with FLUSH TABLES WITH READ LOCK) , STATEMENT (locks implicitly released at statement end) or TRANSACTION (locks implicitly released at transaction end).',"
"LOCK_STATUS VARCHAR(32) not null comment 'Lock status. One of GRANTED, KILLED, PENDING, POST_RELEASE_NOTIFY, PRE_ACQUIRE_NOTIFY, TIMEOUT or VICTIM.',"
"SOURCE VARCHAR(64) comment 'Source file containing the instrumented code that produced the event, as well as the line number where the instrumentation occurred. This allows one to examine the source code involved.',"
"OWNER_THREAD_ID BIGINT unsigned comment 'Thread that requested the lock.',"
"OWNER_EVENT_ID BIGINT unsigned comment 'Event that requested the lock.')")},
false, /* m_perpetual */
false, /* m_optional */
&m_share_state
};
PFS_engine_table* table_metadata_locks::create(void)
{
return new table_metadata_locks();
}
ha_rows
table_metadata_locks::get_row_count(void)
{
return global_mdl_container.get_row_count();
}
table_metadata_locks::table_metadata_locks()
: PFS_engine_table(&m_share, &m_pos),
m_row_exists(false), m_pos(0), m_next_pos(0)
{}
void table_metadata_locks::reset_position(void)
{
m_pos.m_index= 0;
m_next_pos.m_index= 0;
}
int table_metadata_locks::rnd_next(void)
{
PFS_metadata_lock *pfs;
m_pos.set_at(&m_next_pos);
PFS_mdl_iterator it= global_mdl_container.iterate(m_pos.m_index);
pfs= it.scan_next(& m_pos.m_index);
if (pfs != NULL)
{
make_row(pfs);
m_next_pos.set_after(&m_pos);
return 0;
}
return HA_ERR_END_OF_FILE;
}
int table_metadata_locks::rnd_pos(const void *pos)
{
PFS_metadata_lock *pfs;
set_position(pos);
pfs= global_mdl_container.get(m_pos.m_index);
if (pfs != NULL)
{
make_row(pfs);
return 0;
}
return HA_ERR_RECORD_DELETED;
}
void table_metadata_locks::make_row(PFS_metadata_lock *pfs)
{
pfs_optimistic_state lock;
m_row_exists= false;
/* Protect this reader against a metadata lock destroy */
pfs->m_lock.begin_optimistic_lock(&lock);
m_row.m_identity= pfs->m_identity;
m_row.m_mdl_type= pfs->m_mdl_type;
m_row.m_mdl_duration= pfs->m_mdl_duration;
m_row.m_mdl_status= pfs->m_mdl_status;
/* Disable source file and line to avoid stale __FILE__ pointers. */
m_row.m_source_length= 0;
m_row.m_owner_thread_id= static_cast<ulong>(pfs->m_owner_thread_id);
m_row.m_owner_event_id= static_cast<ulong>(pfs->m_owner_event_id);
if (m_row.m_object.make_row(& pfs->m_mdl_key))
return;
if (pfs->m_lock.end_optimistic_lock(&lock))
m_row_exists= true;
}
int table_metadata_locks::read_row_values(TABLE *table,
unsigned char *buf,
Field **fields,
bool read_all)
{
Field *f;
if (unlikely(! m_row_exists))
return HA_ERR_RECORD_DELETED;
/* Set the null bits */
assert(table->s->null_bytes == 1);
buf[0]= 0;
for (; (f= *fields) ; fields++)
{
if (read_all || bitmap_is_set(table->read_set, f->field_index))
{
switch(f->field_index)
{
case 0: /* OBJECT_TYPE */
case 1: /* OBJECT_SCHEMA */
case 2: /* OBJECT_NAME */
m_row.m_object.set_nullable_field(f->field_index, f);
break;
case 3: /* OBJECT_INSTANCE */
set_field_ulonglong(f, (intptr) m_row.m_identity);
break;
case 4: /* LOCK_TYPE */
set_field_mdl_type(f, m_row.m_mdl_type, m_row.m_object.m_object_type == OBJECT_TYPE_BACKUP);
break;
case 5: /* LOCK_DURATION */
set_field_mdl_duration(f, m_row.m_mdl_duration);
break;
case 6: /* LOCK_STATUS */
set_field_mdl_status(f, m_row.m_mdl_status);
break;
case 7: /* SOURCE */
set_field_varchar_utf8(f, m_row.m_source, m_row.m_source_length);
break;
case 8: /* OWNER_THREAD_ID */
if (m_row.m_owner_thread_id != 0)
set_field_ulonglong(f, m_row.m_owner_thread_id);
else
f->set_null();
break;
case 9: /* OWNER_EVENT_ID */
if (m_row.m_owner_event_id != 0)
set_field_ulonglong(f, m_row.m_owner_event_id);
else
f->set_null();
break;
default:
assert(false);
}
}
}
return 0;
}
|
