Innodb_data_lock_wait_iterator Class Reference

Inspect data lock waits for the innodb storage engine. More...

Inheritance diagram for Innodb_data_lock_wait_iterator:

Public Member Functions
bool	scan (PSI_server_data_lock_wait_container *container) override
	Scan for more data lock waits. More...
void	fetch (PSI_server_data_lock_wait_container *container, const char *requesting_engine_lock_id, size_t requesting_engine_lock_id_length, const char *blocking_engine_lock_id, size_t blocking_engine_lock_id_length) override
	Fetch a given data lock wait. More...
Public Member Functions inherited from PSI_engine_data_lock_wait_iterator
	PSI_engine_data_lock_wait_iterator ()=default
virtual	~PSI_engine_data_lock_wait_iterator ()=default

Static Private Member Functions
static size_t	report (PSI_server_data_lock_wait_container &container, const lock_t &wait_lock, bool with_filter, const lock_guid_t &filter_blocking_lock_guid=lock_guid_t())
	For a given wait_lock it will inform container about each lock which is blocking this wait_lock, subject to filtering defined for the container, and optionally by filter_blocking_lock_immutable_id if with_filter is true. More...

Private Attributes
All_locks_iterator	m_all_locks_iterator

Detailed Description

Inspect data lock waits for the innodb storage engine.

Member Function Documentation

fetch()

void Innodb_data_lock_wait_iterator::fetch ( PSI_server_data_lock_wait_container *  container, const char *  requesting_engine_lock_id, size_t  requesting_engine_lock_id_length, const char *  blocking_engine_lock_id, size_t  blocking_engine_lock_id_length  )

overridevirtual

Fetch a given data lock wait.

Parameters

container	The container to fill
requesting_engine_lock_id	The requesting lock id to search
requesting_engine_lock_id_length	The requesting lock id length
blocking_engine_lock_id	The blocking lock id to search
blocking_engine_lock_id_length	The blocking lock id length

Implements PSI_engine_data_lock_wait_iterator.

report()

size_t Innodb_data_lock_wait_iterator::report ( PSI_server_data_lock_wait_container &  container, const lock_t &  wait_lock, bool  with_filter, const lock_guid_t &  filter_blocking_lock_guid = lock_guid_t()  )

staticprivate

For a given wait_lock it will inform container about each lock which is blocking this wait_lock, subject to filtering defined for the container, and optionally by filter_blocking_lock_immutable_id if with_filter is true.

The with_filter is used to fetch just a single blocking lock, the one specified by its immutable id. Please note, that there is no guarantee that this blocking lock is still in the lock sys.

Parameters

[in,out]	container	The container to fill. Serves as both visitor and filter
[in]	wait_lock	The requesting lock which has to wait
[in]	with_filter	If true then filter_blocking_lock_immutable_id has to be passed, and means that only the lock with that immutable id (if still present and matches the container's filters) should be reported to the container. If false then all locks blocking the wait_lock are considered for reporting.
[in]	filter_blocking_lock_guid	if with_filter is true it further narrows the set of reported locks to just the one with given guid.

Returns

number of locks reported to the container

scan()

bool Innodb_data_lock_wait_iterator::scan ( PSI_server_data_lock_wait_container *  container )

overridevirtual

Scan for more data lock waits.

Parameters

container

The container to fill

Returns

true if the iterator is done

Implements PSI_engine_data_lock_wait_iterator.

Member Data Documentation

m_all_locks_iterator

All_locks_iterator Innodb_data_lock_wait_iterator::m_all_locks_iterator

private

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

• storage/innobase/handler/p_s.cc