lockid_t Class Reference

The means of identifying a desired or held lock. More...

#include <lock_s.h>

Public Member Functions
bool	operator< (lockid_t const &p) const
	comparison operator for lockid_t, used by lock manager More...
bool	operator== (const lockid_t &p) const
	equality operator for lockid_t More...
bool	operator!= (const lockid_t &p) const
	inequality operator for lockid_t More...
uint32_t	hash () const
	Used by lock cache. More...
void	zero ()
	clear out the lockid - initialize to mean nothing More...
StoreID	store () const
	extract store number lockid whose lspace() == t_store or has parent with lspace() == t_store More...
	lockid_t ()
	lockid_t (StoreID stid, const unsigned char *keystr, int16_t keylen)
	construct from key string in an index More...
	lockid_t (StoreID stid, const w_keystr_t &key)
	construct from key string in an index More...
	lockid_t (const lockid_t &i)
	copy constructor More...
lockid_t &	operator= (const lockid_t &i)
	copy operator More...

Private Member Functions
void	set_store (StoreID s)
void	_init_for_str (StoreID stid, const unsigned char *keystr, int16_t keylen)
uint64_t	hash64 (uint32_t seed, const unsigned char *str, int16_t len)

Private Attributes
union {
uint64_t   l [2]
uint32_t   w [4]
};

Friends
ostream &	operator<< (ostream &o, const lockid_t &i)

Detailed Description

The means of identifying a desired or held lock.

Lock manager requests (acquire, release, query) take an argument of this kind to identify the entity to be locked.

Currently, we have only lockid_t made from key. No other lock type exists in the main lock table. For intent locks, we use LIL (light-weight intent lock) which are separated from the main lock table. So, this object is drastically simplified from original Shore-MT.

Constructor & Destructor Documentation

lockid_t() [1/4]

lockid_t::lockid_t ( )

inline

lockid_t() [2/4]

lockid_t::lockid_t ( StoreID  stid, const unsigned char *  keystr, int16_t  keylen  )

inline

construct from key string in an index

lockid_t() [3/4]

lockid_t::lockid_t ( StoreID  stid, const w_keystr_t &  key  )

inline

construct from key string in an index

lockid_t() [4/4]

lockid_t::lockid_t ( const lockid_t &  i )

inline

copy constructor

Member Function Documentation

_init_for_str()

void lockid_t::_init_for_str ( StoreID  stid, const unsigned char *  keystr, int16_t  keylen  )

inlineprivate

hash()

uint32_t lockid_t::hash ( ) const

inline

Used by lock cache.

hash64()

uint64_t lockid_t::hash64 ( uint32_t  seed, const unsigned char *  str, int16_t  len  )

inlineprivate

operator!=()

bool lockid_t::operator!= ( const lockid_t &  p ) const

inline

inequality operator for lockid_t

operator<()

bool lockid_t::operator< ( lockid_t const &  p ) const

inline

comparison operator for lockid_t, used by lock manager

operator=()

lockid_t & lockid_t::operator= ( const lockid_t &  i )

inline

copy operator

operator==()

bool lockid_t::operator== ( const lockid_t &  p ) const

inline

equality operator for lockid_t

set_store()

void lockid_t::set_store ( StoreID  s )

inlineprivate

store()

StoreID lockid_t::store ( ) const

inline

extract store number lockid whose lspace() == t_store or has parent with lspace() == t_store

zero()

void lockid_t::zero ( )

inline

clear out the lockid - initialize to mean nothing

Friends And Related Function Documentation

operator<<

ostream& operator<< ( ostream &  o, const lockid_t &  i  )

friend

Member Data Documentation

@29

union { ... }

l and w are for convenience w[0] == vol w[1] == store w[2,3]== l[1] == key (its hash)

l

uint64_t lockid_t::l[2]

w

uint32_t lockid_t::w[4]

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

• src/sm/lock_s.h