Open_table_context Class Reference

A context of open_tables() function, used to recover from a failed open_table() or open_routine() attempt. More...

#include <sql_base.h>

Public Types
enum	enum_open_table_action {   OT_NO_ACTION = 0 , OT_BACKOFF_AND_RETRY , OT_REOPEN_TABLES , OT_DISCOVER ,   OT_REPAIR , OT_FIX_ROW_TYPE }

Public Member Functions
	Open_table_context (THD *thd, uint flags)
	Open_table_context. More...
bool	recover_from_failed_open ()
	Recover from failed attempt of open table by performing requested action. More...
bool	request_backoff_action (enum_open_table_action action_arg, Table_ref *table)
	Check if we can back-off and set back off action if we can. More...
bool	can_recover_from_failed_open () const
const MDL_savepoint &	start_of_statement_svp () const
	When doing a back-off, we close all tables acquired by this statement. More...
ulong	get_timeout () const
uint	get_flags () const
void	set_has_protection_against_grl ()
	Set flag indicating that we have already acquired metadata lock protecting this statement against GRL while opening tables. More...
bool	has_protection_against_grl () const
bool	can_back_off () const

Private Attributes
THD *	m_thd
Table_ref *	m_failed_table
	For OT_DISCOVER, OT_REPAIR and OT_FIX_ROW_TYPE actions, the table list element for the table which definition should be re-discovered/updated or which should be repaired. More...
MDL_savepoint	m_start_of_statement_svp
ulong	m_timeout
	Lock timeout in seconds. More...
uint	m_flags
enum enum_open_table_action	m_action
	Back off action. More...
bool	m_has_locks
	Whether we had any locks when this context was created. More...
bool	m_has_protection_against_grl
	Indicates that in the process of opening tables we have acquired protection against global read lock. More...

Detailed Description

A context of open_tables() function, used to recover from a failed open_table() or open_routine() attempt.

Member Enumeration Documentation

enum_open_table_action

enum Open_table_context::enum_open_table_action

Enumerator
OT_NO_ACTION
OT_BACKOFF_AND_RETRY
OT_REOPEN_TABLES
OT_DISCOVER
OT_REPAIR
OT_FIX_ROW_TYPE

Member Function Documentation

can_back_off()

bool Open_table_context::can_back_off ( ) const

inline

can_recover_from_failed_open()

bool Open_table_context::can_recover_from_failed_open ( ) const

inline

get_flags()

uint Open_table_context::get_flags ( ) const

inline

get_timeout()

ulong Open_table_context::get_timeout ( ) const

inline

has_protection_against_grl()

bool Open_table_context::has_protection_against_grl ( ) const

inline

set_has_protection_against_grl()

void Open_table_context::set_has_protection_against_grl ( )

inline

Set flag indicating that we have already acquired metadata lock protecting this statement against GRL while opening tables.

start_of_statement_svp()

const MDL_savepoint & Open_table_context::start_of_statement_svp ( ) const

inline

When doing a back-off, we close all tables acquired by this statement.

Return an MDL savepoint taken at the beginning of the statement, so that we can rollback to it before waiting on locks.

Member Data Documentation

m_action

enum enum_open_table_action Open_table_context::m_action

private

Back off action.

m_failed_table

Table_ref* Open_table_context::m_failed_table

private

For OT_DISCOVER, OT_REPAIR and OT_FIX_ROW_TYPE actions, the table list element for the table which definition should be re-discovered/updated or which should be repaired.

m_flags

uint Open_table_context::m_flags

private

m_has_locks

bool Open_table_context::m_has_locks

private

Whether we had any locks when this context was created.

If we did, they are from the previous statement of a transaction, and we can't safely do back-off (and release them).

m_has_protection_against_grl

bool Open_table_context::m_has_protection_against_grl

private

Indicates that in the process of opening tables we have acquired protection against global read lock.

m_start_of_statement_svp

MDL_savepoint Open_table_context::m_start_of_statement_svp

private

m_thd

THD* Open_table_context::m_thd

private

m_timeout

ulong Open_table_context::m_timeout

private

Lock timeout in seconds.

Initialized to LONG_TIMEOUT when opening system tables or to the "lock_wait_timeout" system variable for regular tables.

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The documentation for this class was generated from the following files:

• sql/sql_base.h
• sql/sql_base.cc