Mutexed_map_thd_srv_session Class Reference

std::map of THD* as key and Srv_session* as value guarded by a read-write lock. More...

Classes
class	Do_Impl

Public Member Functions
bool	init ()
	Initializes the map. More...
bool	deinit ()
	Deinitializes the map. More...
Srv_session *	find (const THD *key)
	Searches for an element with in the map. More...
bool	add (const THD *key, const void *plugin, Srv_session *session)
	Add an element to the map. More...
bool	remove (const THD *key)
	Removes an element from the map. More...
void	remove_all_of_plugin (const void *plugin, unsigned int &removed)
	Removes all elements which have been added with plugin as plugin name. More...
bool	clear ()
	Empties the map. More...
unsigned int	size ()
	Returns the number of elements in the maps. More...

Private Types
typedef std::pair< const void *, Srv_session * >	map_value_t

Private Attributes
std::map< const THD *, map_value_t >	collection
bool	initted
bool	psi_initted
mysql_rwlock_t	LOCK_collection
PSI_rwlock_key	key_LOCK_collection

Detailed Description

std::map of THD* as key and Srv_session* as value guarded by a read-write lock.

RW lock is used instead of a mutex, as find() is a hot spot due to the sanity checks it is used for - when a pointer to a closed session is passed.

Member Typedef Documentation

map_value_t

typedef std::pair<const void *, Srv_session *> Mutexed_map_thd_srv_session::map_value_t

private

Member Function Documentation

add()

bool Mutexed_map_thd_srv_session::add ( const THD *  key, const void *  plugin, Srv_session *  session  )

inline

Add an element to the map.

Parameters

key	key
plugin	secondary key
session	object to be added to the collection

Return values

false	success
true	failure

clear()

bool Mutexed_map_thd_srv_session::clear ( )

inline

Empties the map.

Returns

false success true failure

deinit()

bool Mutexed_map_thd_srv_session::deinit ( void  )

inline

Deinitializes the map.

Returns

false success true failure

find()

Srv_session * Mutexed_map_thd_srv_session::find ( const THD *  key )

inline

Searches for an element with in the map.

Parameters

key	Key of the element

Returns

value of the element

Return values

NULL	if not found

init()

bool Mutexed_map_thd_srv_session::init ( void  )

inline

Initializes the map.

Returns

false success true failure

remove()

bool Mutexed_map_thd_srv_session::remove ( const THD *  key )

inline

Removes an element from the map.

Parameters

key

key

Returns

false success true failure

remove_all_of_plugin()

void Mutexed_map_thd_srv_session::remove_all_of_plugin ( const void *  plugin, unsigned int &  removed  )

inline

Removes all elements which have been added with plugin as plugin name.

Parameters

plugin	key
removed	OUT Number of removed elements

size()

unsigned int Mutexed_map_thd_srv_session::size ( )

inline

Returns the number of elements in the maps.

Member Data Documentation

collection

std::map<const THD *, map_value_t> Mutexed_map_thd_srv_session::collection

private

initted

bool Mutexed_map_thd_srv_session::initted

private

key_LOCK_collection

PSI_rwlock_key Mutexed_map_thd_srv_session::key_LOCK_collection

private

LOCK_collection

mysql_rwlock_t Mutexed_map_thd_srv_session::LOCK_collection

private

psi_initted

bool Mutexed_map_thd_srv_session::psi_initted

private

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

• sql/srv_session.cc