ib_counter_t< Type, N, Indexer > Class Template Reference

Class for using fuzzy counters. More...

#include <ut0counter.h>

Public Member Functions
	ib_counter_t ()
	~ib_counter_t ()
bool	validate () 1
void	inc () 1
	If you can't use a good index id. More...
void	add (Type n) 1
	If you can't use a good index id. More...
void	add (size_t index, Type n) 1
	Use this if you can use a unique identifier, saves a call to get_rnd_index(). More...
void	dec () 1
	If you can't use a good index id. More...
void	sub (Type n) 1
	If you can't use a good index id. More...
void	sub (size_t index, Type n) 1
	Use this if you can use a unique identifier, saves a call to get_rnd_index(). More...
	operator Type () const 1
Type	operator[] (size_t index) const 1

Static Public Member Functions
static bool	is_fast ()

Private Attributes
Indexer< Type, N >	m_policy
	Indexer into the array. More...
Type	m_counter [(N+1) *(ut::INNODB_CACHE_LINE_SIZE/sizeof(Type))]
	Slot 0 is unused. More...

Detailed Description

template<typename Type, int N = IB_N_SLOTS, template< typename, int > class Indexer = default_indexer_t>
class ib_counter_t< Type, N, Indexer >

Class for using fuzzy counters.

The counter is not protected by any mutex and the results are not guaranteed to be 100% accurate but close enough. Creates an array of counters and separates each element by the ut::INNODB_CACHE_LINE_SIZE bytes

Constructor & Destructor Documentation

ib_counter_t()

template<typename Type , int N = IB_N_SLOTS, template< typename, int > class Indexer = default_indexer_t>

ib_counter_t< Type, N, Indexer >::ib_counter_t ( )

inline

~ib_counter_t()

template<typename Type , int N = IB_N_SLOTS, template< typename, int > class Indexer = default_indexer_t>

ib_counter_t< Type, N, Indexer >::~ib_counter_t ( )

inline

Member Function Documentation

add() [1/2]

template<typename Type , int N = IB_N_SLOTS, template< typename, int > class Indexer = default_indexer_t>

void ib_counter_t< Type, N, Indexer >::add ( size_t  index, Type  n  )

inline

Use this if you can use a unique identifier, saves a call to get_rnd_index().

Parameters

index	index into a slot
n	amount to increment

add() [2/2]

template<typename Type , int N = IB_N_SLOTS, template< typename, int > class Indexer = default_indexer_t>

void ib_counter_t< Type, N, Indexer >::add ( Type  n )

inline

If you can't use a good index id.

Parameters

n	is the amount to increment

dec()

template<typename Type , int N = IB_N_SLOTS, template< typename, int > class Indexer = default_indexer_t>

void ib_counter_t< Type, N, Indexer >::dec ( )

inline

If you can't use a good index id.

Decrement by 1.

inc()

template<typename Type , int N = IB_N_SLOTS, template< typename, int > class Indexer = default_indexer_t>

void ib_counter_t< Type, N, Indexer >::inc ( )

inline

If you can't use a good index id.

Increment by 1.

is_fast()

template<typename Type , int N = IB_N_SLOTS, template< typename, int > class Indexer = default_indexer_t>

static bool ib_counter_t< Type, N, Indexer >::is_fast ( )

inlinestatic

operator Type()

template<typename Type , int N = IB_N_SLOTS, template< typename, int > class Indexer = default_indexer_t>

ib_counter_t< Type, N, Indexer >::operator Type ( ) const

inline

operator[]()

template<typename Type , int N = IB_N_SLOTS, template< typename, int > class Indexer = default_indexer_t>

Type ib_counter_t< Type, N, Indexer >::operator[] ( size_t  index ) const

inline

sub() [1/2]

template<typename Type , int N = IB_N_SLOTS, template< typename, int > class Indexer = default_indexer_t>

void ib_counter_t< Type, N, Indexer >::sub ( size_t  index, Type  n  )

inline

Use this if you can use a unique identifier, saves a call to get_rnd_index().

Parameters

index	index into a slot
n	amount to decrement

sub() [2/2]

template<typename Type , int N = IB_N_SLOTS, template< typename, int > class Indexer = default_indexer_t>

void ib_counter_t< Type, N, Indexer >::sub ( Type  n )

inline

If you can't use a good index id.

Parameters

n	the amount to decrement

validate()

template<typename Type , int N = IB_N_SLOTS, template< typename, int > class Indexer = default_indexer_t>

bool ib_counter_t< Type, N, Indexer >::validate ( )

inline

Member Data Documentation

m_counter

template<typename Type , int N = IB_N_SLOTS, template< typename, int > class Indexer = default_indexer_t>

Type ib_counter_t< Type, N, Indexer >::m_counter[(N+1) *(ut::INNODB_CACHE_LINE_SIZE/sizeof(Type))]

private

Slot 0 is unused.

m_policy

template<typename Type , int N = IB_N_SLOTS, template< typename, int > class Indexer = default_indexer_t>

Indexer<Type, N> ib_counter_t< Type, N, Indexer >::m_policy

private

Indexer into the array.

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

• storage/innobase/include/ut0counter.h