MDL_wait_for_graph_visitor Class Reference

#include <mdl.h>

Inheritance diagram for MDL_wait_for_graph_visitor:

Public Member Functions
virtual bool	enter_node (MDL_context *node)=0
virtual void	leave_node (MDL_context *node)=0
virtual bool	inspect_edge (MDL_context *dest)=0

Public Attributes
uint	m_lock_open_count

Detailed Description

An abstract class for inspection of a connected subgraph of the wait-for graph.

Definition at line 497 of file mdl.h.

Member Data Documentation

uint MDL_wait_for_graph_visitor::m_lock_open_count

XXX, hack: During deadlock search, we may need to inspect TABLE_SHAREs and acquire LOCK_open. Since LOCK_open is not a recursive mutex, count here how many times we "took" it (but only take and release once). Not using a native recursive mutex or rwlock in 5.5 for LOCK_open since it has significant performance impacts.

Definition at line 515 of file mdl.h.

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

• sql/mdl.h
• sql/mdl.cc