locksys::Latches::Page_shards Class Reference

Public Member Functions
	Page_shards ()
	~Page_shards ()
const Lock_mutex &	get_mutex (const page_id_t &page_id) const
	Returns the mutex which (together with the global latch) protects the page shard which contains record locks for records from the given page. More...
Lock_mutex &	get_mutex (const page_id_t &page_id)
	Returns the mutex which (together with the global latch) protects the page shard which contains record locks for records from the given page. More...
Lock_mutex &	get_mutex (const uint64_t cell_id)
	Returns the mutex which (together with the global latch) protects the page shard which contains record locks from given cell of hash tables. More...

Static Private Member Functions
static size_t	get_shard (const page_id_t &page_id)
	Identifies the page shard which contains record locks for records from the given page. More...

Private Attributes
Padded_mutex	mutexes [SHARDS_COUNT]
	Each shard is protected by a separate mutex. More...

Constructor & Destructor Documentation

Page_shards()

locksys::Latches::Page_shards::Page_shards

(

)

~Page_shards()

locksys::Latches::Page_shards::~Page_shards

(

)

Member Function Documentation

get_mutex() [1/3]

Lock_mutex & locksys::Latches::Page_shards::get_mutex

(

const page_id_t &

page_id

)

Returns the mutex which (together with the global latch) protects the page shard which contains record locks for records from the given page.

Parameters

[in]

page_id

The space_id and page_no of the page

Returns

The mutex responsible for the shard containing the page

get_mutex() [2/3]

const Lock_mutex & locksys::Latches::Page_shards::get_mutex

(

const page_id_t &

page_id

)

const

Returns the mutex which (together with the global latch) protects the page shard which contains record locks for records from the given page.

Parameters

[in]

page_id

The space_id and page_no of the page

Returns

The mutex responsible for the shard containing the page

get_mutex() [3/3]

Lock_mutex & locksys::Latches::Page_shards::get_mutex

(

const uint64_t

cell_id

)

Returns the mutex which (together with the global latch) protects the page shard which contains record locks from given cell of hash tables.

Parameters

[in]

cell_id

The cell_id of the hash table

Returns

The mutex responsible for the shard containing the page

get_shard()

size_t locksys::Latches::Page_shards::get_shard ( const page_id_t &  page_id )

staticprivate

Identifies the page shard which contains record locks for records from the given page.

Parameters

[in]

page_id

The space_id and page_no of the page

Returns

Integer in the range [0..lock_sys_t::SHARDS_COUNT)

Member Data Documentation

mutexes

Padded_mutex locksys::Latches::Page_shards::mutexes[SHARDS_COUNT]

private

Each shard is protected by a separate mutex.

Mutexes are padded to avoid false sharing issues with cache.

---

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

• storage/innobase/include/lock0latches.h
• storage/innobase/lock/lock0latches.cc