Counter Namespace Reference

Sharded atomic counter. More...

Classes
struct	Shard
	Counter shard. More...

Typedefs
using	Type = uint64_t
using	N = std::atomic< Type >
using	Pad = byte[INNOBASE_CACHE_LINE_SIZE - sizeof(N)]
template<size_t COUNT = 128>
using	Shards = std::array< Shard, COUNT >
using	Function = std::function< void(const Type)>

Functions
template<size_t COUNT>
void	inc (Shards< COUNT > &shards, size_t id)
	Increment the counter of a shard by 1. More...
template<size_t COUNT>
void	add (Shards< COUNT > &shards, size_t id, size_t n)
	Increment the counter for a shard by n. More...
template<size_t COUNT>
Type	get (const Shards< COUNT > &shards, size_t id)
	Get the counter value for a shard. More...
template<size_t COUNT>
void	for_each (const Shards< COUNT > &shards, Function &&f)
	Iterate over the shards. More...
template<size_t COUNT>
Type	total (const Shards< COUNT > &shards)
	Get the total value of all shards. More...
template<size_t COUNT>
void	clear (Shards< COUNT > &shards)
	Clear the counter - reset to 0. More...

Detailed Description

Sharded atomic counter.

Typedef Documentation

Function

using Counter::Function = typedef std::function<void(const Type)>

N

using Counter::N = typedef std::atomic<Type>

Pad

using Counter::Pad = typedef byte[INNOBASE_CACHE_LINE_SIZE - sizeof(N)]

Shards

template<size_t COUNT = 128>

using Counter::Shards = typedef std::array<Shard, COUNT>

Type

using Counter::Type = typedef uint64_t

Function Documentation

add()

template<size_t COUNT>

void Counter::add ( Shards< COUNT > &  shards, size_t  id, size_t  n  )

inline

Increment the counter for a shard by n.

Parameters

[in,out]	shards	Sharded counter to increment.
[in]	id	Shard key.
[in]	n	Number to add.

clear()

template<size_t COUNT>

void Counter::clear ( Shards< COUNT > &  shards )

inline

Clear the counter - reset to 0.

Parameters

[in,out]

shards

Shards to clear.

for_each()

template<size_t COUNT>

void Counter::for_each ( const Shards< COUNT > &  shards, Function &&  f  )

inline

Iterate over the shards.

Parameters

[in]	shards	Shards to iterate over
[in]	f	Callback function

Returns

total value.

get()

template<size_t COUNT>

Type Counter::get ( const Shards< COUNT > &  shards, size_t  id  )

inline

Get the counter value for a shard.

Parameters

[in,out]	shards	Sharded counter to increment.
[in]	id	Shard key.

inc()

template<size_t COUNT>

void Counter::inc ( Shards< COUNT > &  shards, size_t  id  )

inline

Increment the counter of a shard by 1.

Parameters

[in,out]	shards	Sharded counter to increment.
[in]	id	Shard key.

total()

template<size_t COUNT>

Type Counter::total ( const Shards< COUNT > &  shards )

inline

Get the total value of all shards.

Parameters

[in]

shards

Shards to sum.

Returns

total value.