lock_t Struct Reference

Lock struct; protected by lock_sys latches. More...

#include <lock0priv.h>

Public Member Functions
	UT_LIST_NODE_T (lock_t) trx_locks
	list of the locks of the transaction More...
void	unlock_gap_lock ()
	Unlock the GAP Lock part of this Next Key Lock. More...
bool	is_record_lock () const
	Determine if the lock object is a record lock. More...
bool	is_predicate () const
	Determine if it is predicate lock. More...
bool	is_waiting () const
bool	is_gap () const
bool	is_record_not_gap () const
bool	is_next_key_lock () const
bool	is_insert_intention () const
bool	includes_supremum () const
uint32_t	type () const
lock_mode	mode () const
Locks_hashtable &	hash_table () const
	Get lock hash table. More...
trx_que_t	trx_que_state () const
std::ostream &	print (std::ostream &out) const
	Print the lock object into the given output stream. More...
std::string	type_mode_string () const
	Convert the member 'type_mode' into a human readable string. More...
const char *	type_string () const
Bitset< const byte >	bitset () const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. More...
Bitset< byte >	bitset ()
	Gets access to the LOCK_REC's bitmap, which indicates heap_no-s, which are the subject of this lock request. More...

Public Attributes
trx_t *	trx
	transaction owning the lock More...
dict_index_t *	index
	Index for a record lock. More...
lock_t *	hash
	Hash chain node for a record lock. More...
union {
lock_table_t   tab_lock
	Table lock. More...
lock_rec_t   rec_lock
	Record lock. More...
};
ulonglong	m_psi_internal_thread_id
	Performance schema thread that created the lock. More...
ulonglong	m_psi_event_id
	Performance schema event that created the lock. More...
uint32_t	type_mode
	The lock type and mode bit flags. More...
uint64_t	m_seq
	Timestamp when it was created. More...

Detailed Description

Lock struct; protected by lock_sys latches.

Member Function Documentation

bitset() [1/2]

Bitset< byte > lock_t::bitset ( )

inline

Gets access to the LOCK_REC's bitmap, which indicates heap_no-s, which are the subject of this lock request.

This should be used directly only in the lock-sys code. Use lock_rec_bitmap_reset(), lock_rec_reset_nth_bit(), lock_rec_set_nth_bit(), and lock_rec_get_nth_bit() wrappers instead. In particular this bitset might be shorter than actual number of heap_no-s on the page!

bitset() [2/2]

Bitset< const byte > lock_t::bitset ( ) const

inline

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

hash_table()

Locks_hashtable & lock_t::hash_table ( ) const

inline

Get lock hash table.

Returns

lock hash table

includes_supremum()

bool lock_t::includes_supremum ( ) const

inline

Returns

true iff this lock is (at least) on supremum pseudo-record

is_gap()

bool lock_t::is_gap ( ) const

inline

Returns

true if the gap lock bit is set

is_insert_intention()

bool lock_t::is_insert_intention ( ) const

inline

Returns

true if the insert intention bit is set

is_next_key_lock()

bool lock_t::is_next_key_lock ( ) const

inline

Returns

true iff the lock is a Next Key Lock

is_predicate()

bool lock_t::is_predicate ( ) const

inline

Determine if it is predicate lock.

Returns

true if predicate lock, false otherwise.

is_record_lock()

bool lock_t::is_record_lock ( ) const

inline

Determine if the lock object is a record lock.

Returns

true if record lock, false otherwise.

is_record_not_gap()

bool lock_t::is_record_not_gap ( ) const

inline

Returns

true if the not gap lock bit is set

is_waiting()

bool lock_t::is_waiting ( ) const

inline

Returns

true if the lock wait flag is set

mode()

lock_mode lock_t::mode ( ) const

inline

Returns

the precise lock mode

print()

std::ostream & lock_t::print ( std::ostream &  out ) const

inline

Print the lock object into the given output stream.

Parameters

[in,out]

out

the output stream

Returns

the given output stream.

trx_que_state()

trx_que_t lock_t::trx_que_state ( ) const

inline

Returns

the transaction's query thread state.

type()

uint32_t lock_t::type ( ) const

inline

Returns

the lock mode

type_mode_string()

std::string lock_t::type_mode_string ( ) const

inline

Convert the member 'type_mode' into a human readable string.

Returns

human readable string

type_string()

const char * lock_t::type_string ( ) const

inline

unlock_gap_lock()

void lock_t::unlock_gap_lock ( )

inline

Unlock the GAP Lock part of this Next Key Lock.

UT_LIST_NODE_T()

lock_t::UT_LIST_NODE_T

(

lock_t

)

list of the locks of the transaction

Member Data Documentation

union { ... } lock_t::@203

hash

lock_t* lock_t::hash

Hash chain node for a record lock.

The link node in a singly linked list, used by the hash table.

index

dict_index_t* lock_t::index

Index for a record lock.

m_psi_event_id

ulonglong lock_t::m_psi_event_id

Performance schema event that created the lock.

m_psi_internal_thread_id

ulonglong lock_t::m_psi_internal_thread_id

Performance schema thread that created the lock.

m_seq

uint64_t lock_t::m_seq

Timestamp when it was created.

rec_lock

lock_rec_t lock_t::rec_lock

Record lock.

tab_lock

lock_table_t lock_t::tab_lock

Table lock.

trx

trx_t* lock_t::trx

transaction owning the lock

type_mode

uint32_t lock_t::type_mode

The lock type and mode bit flags.

LOCK_GAP or LOCK_REC_NOT_GAP, LOCK_INSERT_INTENTION, wait flag, ORed

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

• storage/innobase/include/lock0priv.h