MySQL 8.0.29
Source Code Documentation
table_variables_by_thread.h
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22
23#ifndef TABLE_VARIABLES_BY_THREAD_H
24#define TABLE_VARIABLES_BY_THREAD_H
25
26/**
27 @file storage/perfschema/table_variables_by_thread.h
28 Table VARIABLES_BY_THREAD (declarations).
29*/
30
31#include <sys/types.h>
32
33#include "my_base.h"
34#include "my_inttypes.h"
40
41class Field;
42class Plugin_table;
43struct PFS_thread;
44struct TABLE;
45struct THR_LOCK;
46
47/**
48 @addtogroup performance_schema_tables
49 @{
50*/
51
52/**
53 A row of table
54 PERFORMANCE_SCHEMA.VARIABLES_BY_THREAD.
55*/
57 /** Column THREAD_ID. */
59 /** Column VARIABLE_NAME. */
61 /** Column VARIABLE_VALUE. */
63};
64
65/**
66 Position of a cursor on
67 PERFORMANCE_SCHEMA.VARIABLES_BY_THREAD.
68 Index 1 on thread (0 based)
69 Index 2 on system variable (0 based)
70*/
73
74 inline void reset(void) {
75 m_index_1 = 0;
76 m_index_2 = 0;
77 }
78
79 inline bool has_more_thread(void) {
81 }
82
83 inline void next_thread(void) {
84 m_index_1++;
85 m_index_2 = 0;
86 }
87};
88
90 public:
93 m_key_1("THREAD_ID"),
94 m_key_2("VARIABLE_NAME") {}
95
96 ~PFS_index_variables_by_thread() override = default;
97
98 virtual bool match(PFS_thread *pfs);
99 virtual bool match(const System_variable *pfs);
100
101 private:
104};
105
106/** Table PERFORMANCE_SCHEMA.VARIABLES_BY_THREAD. */
109
110 public:
111 /** Table share */
114 static ha_rows get_row_count();
115
116 void reset_position(void) override;
117
118 int rnd_init(bool scan) override;
119 int rnd_next() override;
120 int rnd_pos(const void *pos) override;
121
122 int index_init(uint idx, bool sorted) override;
123 int index_next() override;
124
125 protected:
126 int read_row_values(TABLE *table, unsigned char *buf, Field **fields,
127 bool read_all) override;
129
130 public:
131 ~table_variables_by_thread() override = default;
132
133 protected:
134 int make_row(PFS_thread *thread, const System_variable *system_var);
135
136 private:
137 /** Table share lock. */
139 /** Table definition. */
141
142 /** Current THD variables. */
144 /** Current row. */
146 /** Current position. */
148 /** Next position. */
150
152};
153
154/** @} */
155#endif
Definition: field.h:573
size_t get_row_count()
Definition: pfs_buffer_container.h:464
Definition: pfs_engine_table.h:299
An abstract PERFORMANCE_SCHEMA table.
Definition: pfs_engine_table.h:69
Definition: table_variables_by_thread.h:89
PFS_key_variable_name m_key_2
Definition: table_variables_by_thread.h:103
virtual bool match(PFS_thread *pfs)
Definition: table_variables_by_thread.cc:46
PFS_index_variables_by_thread()
Definition: table_variables_by_thread.h:91
~PFS_index_variables_by_thread() override=default
PFS_key_thread_id m_key_1
Definition: table_variables_by_thread.h:102
Definition: table_helper.h:1250
Definition: table_helper.h:1531
System variable cache.
Definition: pfs_variable.h:607
Class to hold information regarding a table to be created on behalf of a plugin.
Definition: plugin_table.h:39
System variable derived from sys_var object.
Definition: pfs_variable.h:170
Table PERFORMANCE_SCHEMA.VARIABLES_BY_THREAD.
Definition: table_variables_by_thread.h:107
int index_init(uint idx, bool sorted) override
Definition: table_variables_by_thread.cc:173
static PFS_engine_table * create(PFS_engine_table_share *)
Definition: table_variables_by_thread.cc:98
PFS_index_variables_by_thread * m_opened_index
Definition: table_variables_by_thread.h:151
void reset_position(void) override
Reset the cursor position to the beginning of the table.
Definition: table_variables_by_thread.cc:121
static Plugin_table m_table_def
Table definition.
Definition: table_variables_by_thread.h:140
int rnd_init(bool scan) override
Initialize table scan.
Definition: table_variables_by_thread.cc:126
pos_t m_pos
Current position.
Definition: table_variables_by_thread.h:147
int rnd_pos(const void *pos) override
Fetch a row by position.
Definition: table_variables_by_thread.cc:156
static ha_rows get_row_count()
Definition: table_variables_by_thread.cc:102
static THR_LOCK m_table_lock
Table share lock.
Definition: table_variables_by_thread.h:138
int read_row_values(TABLE *table, unsigned char *buf, Field **fields, bool read_all) override
Read the current row values.
Definition: table_variables_by_thread.cc:245
int rnd_next() override
Fetch the next row in this cursor.
Definition: table_variables_by_thread.cc:133
table_variables_by_thread()
Definition: table_variables_by_thread.cc:115
static PFS_engine_table_share m_share
Table share.
Definition: table_variables_by_thread.h:112
int make_row(PFS_thread *thread, const System_variable *system_var)
Definition: table_variables_by_thread.cc:216
~table_variables_by_thread() override=default
PFS_system_variable_cache m_sysvar_cache
Current THD variables.
Definition: table_variables_by_thread.h:143
pos_variables_by_thread pos_t
Definition: table_variables_by_thread.h:108
row_variables_by_thread m_row
Current row.
Definition: table_variables_by_thread.h:145
pos_t m_next_pos
Next position.
Definition: table_variables_by_thread.h:149
int index_next() override
Find key in index, read record.
Definition: table_variables_by_thread.cc:186
char * pos
Definition: do_ctype.cc:76
This file includes constants used by all storage engines.
my_off_t ha_rows
Definition: my_base.h:1139
Some integer typedefs for easier portability.
unsigned long long int ulonglong
Definition: my_inttypes.h:55
Definition: buf0block_hint.cc:29
Generic buffer container.
PFS_thread_container global_thread_container
Performance schema tables (declarations).
Performance schema system and status variables (declarations).
static const LEX_CSTRING pfs
Definition: sql_show_processlist.cc:65
Performance schema instrumentation (declarations).
Position of a double cursor, for iterations using 2 nested loops.
Definition: pfs_engine_table.h:593
uint m_index_1
Outer index.
Definition: pfs_engine_table.h:595
uint m_index_2
Current index within index_1.
Definition: pfs_engine_table.h:597
A PERFORMANCE_SCHEMA table share.
Definition: pfs_engine_table.h:357
Instrumented thread implementation.
Definition: pfs_instr.h:372
Definition: table_helper.h:1086
Definition: table_helper.h:1099
Definition: table.h:1394
Definition: thr_lock.h:138
Position of a cursor on PERFORMANCE_SCHEMA.VARIABLES_BY_THREAD.
Definition: table_variables_by_thread.h:71
pos_variables_by_thread()
Definition: table_variables_by_thread.h:72
bool has_more_thread(void)
Definition: table_variables_by_thread.h:79
void next_thread(void)
Definition: table_variables_by_thread.h:83
void reset(void)
Definition: table_variables_by_thread.h:74
A row of table PERFORMANCE_SCHEMA.VARIABLES_BY_THREAD.
Definition: table_variables_by_thread.h:56
ulonglong m_thread_internal_id
Column THREAD_ID.
Definition: table_variables_by_thread.h:58
PFS_variable_value_row m_variable_value
Column VARIABLE_VALUE.
Definition: table_variables_by_thread.h:62
PFS_variable_name_row m_variable_name
Column VARIABLE_NAME.
Definition: table_variables_by_thread.h:60
Helpers to implement a performance schema table.
unsigned int uint
Definition: uca-dump.cc:29