Commit_order_lock_graph Class Reference

MDL subgraph inspector class to be used as a ticket to wait on by worker threads. More...

#include <rpl_replica_commit_order_manager.h>

Inheritance diagram for Commit_order_lock_graph:

Public Member Functions
	Commit_order_lock_graph (MDL_context &ctx, Commit_order_manager &mngr, uint32 worker_id)
	Constructor for the class. More...
virtual	~Commit_order_lock_graph () override=default
	Default destructor. More...
MDL_context *	get_ctx () const
	Retrieves the MDL context object associated with the underlying worker. More...
uint32	get_worker_id () const
	Retrieves the identifier for the underlying worker thread. More...
bool	accept_visitor (MDL_wait_for_graph_visitor *dvisitor) override
	Determines if the underlying worker is in deadlock with the MDL context encapsulated in the visitor parameter. More...
uint	get_deadlock_weight () const override
	Retrieves the deadlock weight to be used to replace a visitor victim's, when more than one deadlock is found. More...
Public Member Functions inherited from MDL_wait_for_subgraph
virtual	~MDL_wait_for_subgraph ()

Private Attributes
MDL_context &	m_ctx
	The MDL context object associated with the underlying worker. More...
Commit_order_manager &	m_mngr
	The Commit_order_manager instance associated with the underlying worker channel's Relay_log_info object. More...
uint32	m_worker_id {0}
	The identifier for the underlying worker thread. More...

Additional Inherited Members
Static Public Attributes inherited from MDL_wait_for_subgraph
static const uint	DEADLOCK_WEIGHT_CO = 0
static const uint	DEADLOCK_WEIGHT_DML = 25
static const uint	DEADLOCK_WEIGHT_ULL = 50
static const uint	DEADLOCK_WEIGHT_DDL = 100

Detailed Description

MDL subgraph inspector class to be used as a ticket to wait on by worker threads.

Each worker will create its own instance of this class and will use its own THD MDL_context to search for deadlocks.

Constructor & Destructor Documentation

Commit_order_lock_graph()

Commit_order_lock_graph::Commit_order_lock_graph	(	MDL_context &	ctx,
		Commit_order_manager &	mngr,
		uint32	worker_id
	)

Constructor for the class.

Parameters

ctx	The worker THD MDL context object.
mngr	The Commit_order_manager instance associated with the current channel's Relay_log_info object.
worker_id	The identifier of the worker targeted by this object.

~Commit_order_lock_graph()

virtual Commit_order_lock_graph::~Commit_order_lock_graph ( )

overridevirtualdefault

Default destructor.

Member Function Documentation

accept_visitor()

bool Commit_order_lock_graph::accept_visitor ( MDL_wait_for_graph_visitor *  dvisitor )

overridevirtual

Determines if the underlying worker is in deadlock with the MDL context encapsulated in the visitor parameter.

Parameters

dvisitor

The MDL graph visitor to check for deadlocks against.

Returns

true if a deadlock was found and false otherwise,

Implements MDL_wait_for_subgraph.

get_ctx()

MDL_context * Commit_order_lock_graph::get_ctx

(

)

const

Retrieves the MDL context object associated with the underlying worker.

Returns

A pointer to the MDL context associated with the underlying worker thread.

get_deadlock_weight()

uint Commit_order_lock_graph::get_deadlock_weight ( ) const

overridevirtual

Retrieves the deadlock weight to be used to replace a visitor victim's, when more than one deadlock is found.

Implements MDL_wait_for_subgraph.

get_worker_id()

uint32 Commit_order_lock_graph::get_worker_id

(

)

const

Retrieves the identifier for the underlying worker thread.

Returns

The identifier for the underlying worker thread.

Member Data Documentation

m_ctx

MDL_context& Commit_order_lock_graph::m_ctx

private

The MDL context object associated with the underlying worker.

m_mngr

Commit_order_manager& Commit_order_lock_graph::m_mngr

private

The Commit_order_manager instance associated with the underlying worker channel's Relay_log_info object.

m_worker_id

uint32 Commit_order_lock_graph::m_worker_id {0}

private

The identifier for the underlying worker thread.

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

• sql/rpl_replica_commit_order_manager.h
• sql/rpl_replica_commit_order_manager.cc