Detailed Description

Implementation of file based on new[] and memcpy.

Definition at line 29 of file memory_file.hpp.

Inheritance diagram for memory_file:

Collaboration diagram for memory_file:

#include <memory_file.hpp>

Public Member Functions
	memory_file (int queue_id=DEFAULT_QUEUE, int allocator_id=NO_ALLOCATOR, unsigned int device_id=DEFAULT_DEVICE_ID)
	constructs file object. More...

	~memory_file ()

void	discard (offset_type offset, offset_type size) final

const char *	io_type () const final

void	lock () final
	Locks file for reading and writing (acquires a lock in the file system). More...

void	serve (void *buffer, offset_type offset, size_type bytes, request::read_or_write op) final

void	set_size (offset_type newsize) final

offset_type	size () final

Public Member Functions inherited from disk_queued_file
	disk_queued_file (int queue_id, int allocator_id)

request_ptr	aread (void *buffer, offset_type pos, size_type bytes, const completion_handler &on_complete=completion_handler()) override

request_ptr	awrite (void *buffer, offset_type pos, size_type bytes, const completion_handler &on_complete=completion_handler()) override

int	get_allocator_id () const override
	Returns the file's parallel disk block allocator number. More...

int	get_queue_id () const override

Public Member Functions inherited from file
	file (unsigned int device_id=DEFAULT_DEVICE_ID, file_stats *file_stats=nullptr)
	Construct a new file, usually called by a subclass. More...

	file (const file &)=delete
	non-copyable: delete copy-constructor More...

	file (file &&)=default
	move-constructor: default More...

virtual	~file ()

void	add_request_ref ()
	increment referenced requests More...

virtual void	close_remove ()
	close and remove file More...

void	delete_request_ref ()
	decrement referenced requests More...

virtual void	export_files (offset_type offset, offset_type length, std::string prefix)

unsigned int	get_device_id () const
	Returns the file's physical device id. More...

file_stats *	get_file_stats () const

size_t	get_request_nref ()
	return number of referenced requests More...

bool	need_alignment () const
	Returns need_alignment_. More...

file &	operator= (const file &)=delete
	non-copyable: delete assignment operator More...

file &	operator= (file &&)=default
	move-assignment operator: default More...

Public Member Functions inherited from ReferenceCounter
	ReferenceCounter () noexcept
	new objects have zero reference count More...

	ReferenceCounter (const ReferenceCounter &) noexcept
	coping still creates a new object with zero reference count More...

	~ReferenceCounter ()

bool	dec_reference () const noexcept
	Call whenever resetting (i.e. More...

void	inc_reference () const noexcept
	Call whenever setting a pointer to the object. More...

ReferenceCounter &	operator= (const ReferenceCounter &) noexcept
	assignment operator, leaves pointers unchanged More...

size_t	reference_count () const noexcept
	Return the number of references to this object (for debugging) More...

bool	unique () const noexcept
	Test if the ReferenceCounter is referenced by only one CountingPtr. More...

Private Attributes
std::mutex	mutex_
	sequentialize function calls More...

char *	ptr_
	pointer to memory area of "file" More...

offset_type	size_
	size of memory area More...

Additional Inherited Members
Public Types inherited from file
using	offset_type = request::offset_type
	the offset of a request, also the size of the file More...

enum	open_mode { RDONLY = 1, WRONLY = 2, RDWR = 4, CREAT = 8, DIRECT = 16, TRUNC = 32, SYNC = 64, NO_LOCK = 128, REQUIRE_DIRECT = 256 }

using	size_type = request::size_type
	the size of a request More...

Static Public Member Functions inherited from file
static int	unlink (const char *path)
	unlink path from filesystem More...

static int	truncate (const char *path, external_size_type length)

Static Public Attributes inherited from file
static const unsigned int	DEFAULT_DEVICE_ID = std::numeric_limits<unsigned int>::max()

static const int	DEFAULT_LINUXAIO_QUEUE = -2

static const int	DEFAULT_QUEUE = -1

static const int	NO_ALLOCATOR = -1

Protected Attributes inherited from file
unsigned int	device_id_

file_stats *	file_stats_

bool	need_alignment_ = false
	Flag whether read/write operations REQUIRE alignment. More...

tlx::reference_counter	request_ref_
	count the number of requests referencing this file More...