Thd_mem_cnt Class Reference

#include <sql_class.h>

Public Member Functions
	Thd_mem_cnt ()
	~Thd_mem_cnt ()
void	set_thd (THD *thd)
void	enable ()
void	disable ()
void	alloc_cnt (size_t size)
	Increase memory counter at 'alloc' operation. More...
void	free_cnt (size_t size)
	Decrease memory counter at 'free' operation. More...
int	reset ()
	Function resets current memory counter mode and adjusts global memory counter according to thread memory counter. More...
void	flush ()
	Function flushes memory counters before deleting the memory counter object. More...
void	restore_mode ()
	Restore original memory counter mode. More...
void	no_error_mode ()
	Set NO ERROR memory counter mode. More...
void	set_curr_mode (uint mode_arg)
	Function sets current memory counter mode. More...
void	set_orig_mode (uint mode_arg)
	Function sets original memory counter mode. More...
bool	is_error () const
	Check if memory counter error is issued. More...
void	set_thd_error_status () const
	Set THD error status using memory counter diagnostics area. More...

Private Member Functions
int	generate_error (int err_no, ulonglong mem_limit, ulonglong mem_size)
	Generate OOM error and set therad to KILL_CONNECTION state. More...
bool	is_error_mode () const
	Check if memory counter is in error mode. More...
bool	is_error_log_mode () const
	Check if memory counter is in error log mode. More...

Private Attributes
bool	m_enabled {false}
THD *	m_thd {nullptr}
Diagnostics_area	m_da {false}
ulonglong	mem_counter {0}
ulonglong	max_conn_mem {0}
ulonglong	glob_mem_counter {0}
uint	curr_mode {MEM_CNT_DEFAULT}
uint	orig_mode {MEM_CNT_DEFAULT}
bool	is_connection_stage {true}

Constructor & Destructor Documentation

Thd_mem_cnt()

Thd_mem_cnt::Thd_mem_cnt ( )

inline

~Thd_mem_cnt()

Thd_mem_cnt::~Thd_mem_cnt ( )

inline

Member Function Documentation

alloc_cnt()

void Thd_mem_cnt::alloc_cnt

(

size_t

size

)

Increase memory counter at 'alloc' operation.

Update global memory counter.

Parameters

size	amount of memory allocated.

disable()

void Thd_mem_cnt::disable

(

)

enable()

void Thd_mem_cnt::enable ( )

inline

flush()

void Thd_mem_cnt::flush

(

)

Function flushes memory counters before deleting the memory counter object.

free_cnt()

void Thd_mem_cnt::free_cnt

(

size_t

size

)

Decrease memory counter at 'free' operation.

Parameters

size	amount of memory freed.

generate_error()

int Thd_mem_cnt::generate_error ( int  err_no, ulonglong  mem_limit, ulonglong  mem_size  )

private

Generate OOM error and set therad to KILL_CONNECTION state.

Do nothing if thread is already killed or any error is already issued.

Parameters

err_no	Error number.
mem_limit	Memory limit.
mem_size	Memory size.

Returns

-1 if OOM error is generated, 0 otherwise.

is_error()

bool Thd_mem_cnt::is_error ( ) const

inline

Check if memory counter error is issued.

Return values

true	if memory counter error is issued, false otherwise.

is_error_log_mode()

bool Thd_mem_cnt::is_error_log_mode ( ) const

inlineprivate

Check if memory counter is in error log mode.

Return values

true	if memory counter is in error log mode, false otherwise.

is_error_mode()

bool Thd_mem_cnt::is_error_mode ( ) const

inlineprivate

Check if memory counter is in error mode.

Return values

true	if memory counter is in error mode, false otherwise.

no_error_mode()

void Thd_mem_cnt::no_error_mode ( )

inline

Set NO ERROR memory counter mode.

reset()

int Thd_mem_cnt::reset

(

void

)

Function resets current memory counter mode and adjusts global memory counter according to thread memory counter.

Returns

-1 if OOM error, 0 otherwise.

restore_mode()

void Thd_mem_cnt::restore_mode ( )

inline

Restore original memory counter mode.

set_curr_mode()

void Thd_mem_cnt::set_curr_mode ( uint  mode_arg )

inline

Function sets current memory counter mode.

Parameters

mode_arg

current memory counter mode.

set_orig_mode()

void Thd_mem_cnt::set_orig_mode ( uint  mode_arg )

inline

Function sets original memory counter mode.

Parameters

mode_arg

original memory counter mode.

set_thd()

void Thd_mem_cnt::set_thd ( THD *  thd )

inline

set_thd_error_status()

void Thd_mem_cnt::set_thd_error_status

(

)

const

Set THD error status using memory counter diagnostics area.

Member Data Documentation

curr_mode

uint Thd_mem_cnt::curr_mode {MEM_CNT_DEFAULT}

private

glob_mem_counter

ulonglong Thd_mem_cnt::glob_mem_counter {0}

private

is_connection_stage

bool Thd_mem_cnt::is_connection_stage {true}

private

m_da

Diagnostics_area Thd_mem_cnt::m_da {false}

private

m_enabled

bool Thd_mem_cnt::m_enabled {false}

private

m_thd

THD* Thd_mem_cnt::m_thd {nullptr}

private

max_conn_mem

ulonglong Thd_mem_cnt::max_conn_mem {0}

private

mem_counter

ulonglong Thd_mem_cnt::mem_counter {0}

private

orig_mode

uint Thd_mem_cnt::orig_mode {MEM_CNT_DEFAULT}

private

---

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

• sql/sql_class.h
• sql/sql_class.cc