ut0counter.h File Reference

Counter utility class. More...

#include <my_rdtsc.h>
#include "univ.i"
#include "os0thread.h"
#include "ut0cpu_cache.h"
#include "ut0dbg.h"
#include <array>
#include <atomic>
#include <functional>

Go to the source code of this file.

Classes
struct	generic_indexer_t< Type, N >
	Get the offset into the counter array. More...
struct	counter_indexer_t< Type, N >
	Use the result of my_timer_cycles(), which mainly uses RDTSC for cycles, to index into the counter array. More...
struct	single_indexer_t< Type, N >
	For counters where N=1. More...
class	ib_counter_t< Type, N, Indexer >
	Class for using fuzzy counters. More...
struct	Counter::Shard
	Counter shard. More...
struct	Counter::Shards< COUNT >

Namespaces
namespace	Counter
	Sharded atomic counter.

Macros
#define	default_indexer_t   counter_indexer_t

Typedefs
using	Counter::Type = uint64_t
using	Counter::N = std::atomic< Type >
using	Counter::Pad = byte[ut::INNODB_CACHE_LINE_SIZE - sizeof(N)]
using	Counter::Function = std::function< void(const Type)>

Functions
template<size_t COUNT>
Type	Counter::add (Shards< COUNT > &shards, size_t id, size_t n)
	Increment the counter for a shard by n. More...
template<size_t COUNT>
Type	Counter::sub (Shards< COUNT > &shards, size_t id, size_t n)
	Decrement the counter for a shard by n. More...
template<size_t COUNT>
Type	Counter::inc (Shards< COUNT > &shards, size_t id)
	Increment the counter of a shard by 1. More...
template<size_t COUNT>
Type	Counter::dec (Shards< COUNT > &shards, size_t id)
	Decrement the counter of a shard by 1. More...
template<size_t COUNT>
Type	Counter::get (const Shards< COUNT > &shards, size_t id) noexcept
	Get the counter value for a shard. More...
template<size_t COUNT>
void	Counter::for_each (const Shards< COUNT > &shards, Function &&f) noexcept
	Iterate over the shards. More...
template<size_t COUNT>
Type	Counter::total (const Shards< COUNT > &shards) noexcept
	Get the total value of all shards. More...
template<size_t COUNT>
void	Counter::clear (Shards< COUNT > &shards) noexcept
	Clear the counter - reset to 0. More...
template<size_t COUNT>
void	Counter::copy (Shards< COUNT > &dst, const Shards< COUNT > &src) noexcept
	Copy the counters, overwrite destination. More...
template<size_t COUNT>
void	Counter::add (Shards< COUNT > &dst, const Shards< COUNT > &src) noexcept
	Accumulate the counters, add source to destination. More...

Variables
constexpr uint32_t	IB_N_SLOTS = 64
	Default number of slots to use in ib_counter_t. More...
constexpr auto	Counter::Memory_order = std::memory_order_relaxed
	Relaxed order by default. More...

Detailed Description

Counter utility class.

Created 2012/04/12 by Sunny Bains

Macro Definition Documentation

default_indexer_t

#define default_indexer_t   counter_indexer_t

Variable Documentation

IB_N_SLOTS

constexpr uint32_t IB_N_SLOTS = 64

constexpr

Default number of slots to use in ib_counter_t.