The lock system struct. More...

#include <lock0lock.h>

Public Member Functions
	lock_sys_t (size_t n_cells)

Public Attributes
locksys::Latches	latches
	The latches protecting queues of record and table locks. More...

Locks_hashtable	rec_hash
	The hash table of the record (LOCK_REC) locks, except for predicate (LOCK_PREDICATE) and predicate page (LOCK_PRDT_PAGE) locks. More...

Locks_hashtable	prdt_hash
	The hash table of predicate (LOCK_PREDICATE) locks. More...

Locks_hashtable	prdt_page_hash
	The hash table of the predicate page (LOCK_PRD_PAGE) locks. More...

uint32_t	n_resizes
	number of calls to lock_sys_resize() so far. More...

char	pad2 [ut::INNODB_CACHE_LINE_SIZE]
	Padding to avoid false sharing of wait_mutex field. More...

Lock_mutex	wait_mutex
	The mutex protecting the next two fields. More...

srv_slot_t *	waiting_threads
	Array of user threads suspended while waiting for locks within InnoDB. More...

srv_slot_t *	last_slot
	The highest slot ever used in the waiting_threads array. More...

bool	rollback_complete
	true if rollback of all recovered transactions is complete. More...

std::chrono::steady_clock::duration	n_lock_max_wait_time
	Max lock wait time observed, for innodb_row_lock_time_max reporting. More...

os_event_t	timeout_event
	Set to the event that is created in the lock wait monitor thread. More...

std::atomic< uint64_t >	m_seq
	Lock timestamp counter, used to assign lock->m_seq on creation. More...

Detailed Description

The lock system struct.

Constructor & Destructor Documentation

◆ lock_sys_t()

lock_sys_t::lock_sys_t ( size_t n_cells )

inline

Member Data Documentation

◆ last_slot

srv_slot_t* lock_sys_t::last_slot

The highest slot ever used in the waiting_threads array.

Protected by lock_sys->wait_mutex.

◆ latches

locksys::Latches lock_sys_t::latches

The latches protecting queues of record and table locks.

◆ m_seq

std::atomic<uint64_t> lock_sys_t::m_seq

Lock timestamp counter, used to assign lock->m_seq on creation.

◆ n_lock_max_wait_time

std::chrono::steady_clock::duration lock_sys_t::n_lock_max_wait_time

Max lock wait time observed, for innodb_row_lock_time_max reporting.

◆ n_resizes

uint32_t lock_sys_t::n_resizes

number of calls to lock_sys_resize() so far.

Used to determine if iterators should be invalidated. Modified under global exclusive lock_sys latch. Read under global shared lock_sys latch.

◆ pad2

char lock_sys_t::pad2[ut::INNODB_CACHE_LINE_SIZE]

Padding to avoid false sharing of wait_mutex field.

◆ prdt_hash

Locks_hashtable lock_sys_t::prdt_hash

The hash table of predicate (LOCK_PREDICATE) locks.

◆ prdt_page_hash

Locks_hashtable lock_sys_t::prdt_page_hash

The hash table of the predicate page (LOCK_PRD_PAGE) locks.

◆ rec_hash

Locks_hashtable lock_sys_t::rec_hash

The hash table of the record (LOCK_REC) locks, except for predicate (LOCK_PREDICATE) and predicate page (LOCK_PRDT_PAGE) locks.

◆ rollback_complete

bool lock_sys_t::rollback_complete

true if rollback of all recovered transactions is complete.

Protected by exclusive global lock_sys latch.

◆ timeout_event

os_event_t lock_sys_t::timeout_event

Set to the event that is created in the lock wait monitor thread.

A value of 0 means the thread is not active

◆ wait_mutex

Lock_mutex lock_sys_t::wait_mutex

The mutex protecting the next two fields.

◆ waiting_threads

srv_slot_t* lock_sys_t::waiting_threads

Array of user threads suspended while waiting for locks within InnoDB.

Protected by the lock_sys->wait_mutex.

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

storage/innobase/include/lock0lock.h

Public Member Functions

Public Attributes