bucket_t Class Reference

Lock table hash table bucket. More...

#include <lock_bucket.h>

Public Member Functions
	bucket_t ()
	~bucket_t ()
lock_queue_t *	find_lock_queue (uint32_t hash)

Private Member Functions
lock_queue_t *	find_lock_queue_nocreate (uint32_t hash)
lock_queue_t *	find_lock_queue_create (uint32_t hash)

Private Attributes
srwlock_t	_queue_latch
lock_queue_t *	_queue

Friends
void	lock_core_m::dump (std::ostream &o)
void	lock_core_m::assert_empty () const

Detailed Description

Lock table hash table bucket.

Lock table's hash table is lock_core_m::_htab, which is an array of bucket_t's. Each bucket contains a linked list of lock_queue_t's and a latch that protects that list's _next pointers.

Constructor & Destructor Documentation

bucket_t()

bucket_t::bucket_t ( )

inline

~bucket_t()

bucket_t::~bucket_t ( )

inline

Member Function Documentation

find_lock_queue()

lock_queue_t * bucket_t::find_lock_queue ( uint32_t  hash )

inline

Finds or creates a lock queue for the given hash value.

find_lock_queue_create()

lock_queue_t * bucket_t::find_lock_queue_create ( uint32_t  hash )

inlineprivate

Find a lock queue for the given hash, creating a new lock queue if needed.

Returns

never returns NULL.

find_lock_queue_nocreate()

lock_queue_t * bucket_t::find_lock_queue_nocreate ( uint32_t  hash )

inlineprivate

Tries to find a lock queue for the given hash without creating a new lock queue. As this is a readonly access, much faster!

Returns

returns NULL if not found. In that case, call find_lock_queue_create().

Friends And Related Function Documentation

lock_core_m::assert_empty

void lock_core_m::assert_empty ( ) const

friend

lock_core_m::dump

void lock_core_m::dump ( std::ostream &  o )

friend

friending for unsafe dump as an exception to the latch protocol here.

Member Data Documentation

_queue

lock_queue_t* bucket_t::_queue

private

Pointer to the first lock_queue_ of our list; protected by _queue_latch.

_queue_latch

srwlock_t bucket_t::_queue_latch

private

Protects accesses to _queue and the _next pointers of the lock_queue_t's on that list only. We only keep this latch until we find or create the right lock_queue_t.

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

• src/sm/lock_bucket.h