MDL_map_partition Class Reference

Public Member Functions
	MDL_map_partition ()
	~MDL_map_partition ()
MDL_lock *	find_or_insert (const MDL_key *mdl_key, my_hash_value_type hash_value)
void	remove (MDL_lock *lock)
my_hash_value_type	get_key_hash (const MDL_key *mdl_key) const

Detailed Description

A partition in a collection of all MDL locks. MDL_map is partitioned for scalability reasons. Maps MDL_key to MDL_lock instances.

Definition at line 121 of file mdl.cc.

Constructor & Destructor Documentation

MDL_map_partition::MDL_map_partition

(

)

Initialize the partition in the container with all MDL locks.

Definition at line 723 of file mdl.cc.

MDL_map_partition::~MDL_map_partition

(

)

Destroy the partition in container for all MDL locks.

Precondition

It must be empty.

Definition at line 754 of file mdl.cc.

Member Function Documentation

MDL_lock * MDL_map_partition::find_or_insert ( const MDL_key *  mdl_key, my_hash_value_type  hash_value  )

inline

Find MDL_lock object corresponding to the key and hash value in MDL_map partition, create it if it does not exist.

Return values

non-NULL	- Success. MDL_lock instance for the key with locked MDL_lock::m_rwlock.
NULL	- Failure (OOM).

Definition at line 818 of file mdl.cc.

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void MDL_map_partition::remove ( MDL_lock *  lock )

inline

Destroy MDL_lock object belonging to specific MDL_map partition or delegate this responsibility to whatever thread that holds the last outstanding reference to it.

Definition at line 986 of file mdl.cc.

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

• sql/mdl.cc