xenium::left_right< T > Struct Template Reference

Generic implementation of the LeftRight algorithm proposed by Ramalhete and Correia [RC15]. More...

#include <left_right.hpp>

Public Member Functions
	left_right (T source)
	Initialize the two underlying T instances with the specified source.
	left_right (T left, T right)
	Initializes the two underlying instances withe the specified sources.
	left_right ()=default
	Default constructs both underlying instances.
template<typename Func >
auto	read (Func &&func) const
	Performs a read operation on the active instance using the specified functor.
template<typename Func >
void	update (Func &&func)
	Performs an update operation on both underlying instances using the specified functor.

Detailed Description

template<typename T>
struct xenium::left_right< T >

Generic implementation of the LeftRight algorithm proposed by Ramalhete and Correia [RC15].

The LeftRight algorithm provides the following advantages when compared to a read-write-lock:

• writers never block readers, i.e., read operations are wait-free (population oblivious)
• readers never block writers, i.e., the updated data is immediately visible to new readers.

This is comes at the cost of a duplication of the underlying data structure, which also means that update operations have to be applied to both instances.

Template Parameters

T

Constructor & Destructor Documentation

left_right() [1/2]

template<typename T >

xenium::left_right< T >::left_right ( T  source )

inline

Initialize the two underlying T instances with the specified source.

The first instance is copy-constructed while the second one is move-constructed.

Parameters

source

the source used to initialize the two underlying instances.

left_right() [2/2]

template<typename T >

xenium::left_right< T >::left_right ( T  left, T  right  )

inline

Initializes the two underlying instances withe the specified sources.

Both instances are move-constructed from the specified sources.

Parameters

left	the source to initialize the left instance
right	the source to initialize the right instance

Member Function Documentation

read()

template<typename T >

template<typename Func >

auto xenium::left_right< T >::read ( Func &&  func ) const

inline

Performs a read operation on the active instance using the specified functor.

The functor func is called for the currently active instance. The instance is passed to the functor as a const reference.

This method simply returns the result of the call to func, i.e., the return type of this method corresponds to the return type of the func;

Template Parameters

Func

Parameters

func

Returns

the value returned by the call to func

update()

template<typename T >

template<typename Func >

void xenium::left_right< T >::update ( Func &&  func )

inline

Performs an update operation on both underlying instances using the specified functor.

The functor func is called twice - once for each underlying instance. The instance to be updated is passed as a non-const reference to func.

Template Parameters

Func

Parameters

func