Implementation of file based on new[] and memcpy. More...

#include <mem_file.h>

Inheritance diagram for mem_file:

Collaboration diagram for mem_file:

Public Member Functions
	mem_file (int queue_id=DEFAULT_QUEUE, int allocator_id=NO_ALLOCATOR)
	constructs file object More...

void	serve (const request *req) throw (io_error)

offset_type	size ()
	Returns size of the file. More...

void	set_size (offset_type newsize)
	Changes the size of the file. More...

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

void	discard (offset_type offset, offset_type size)
	Discard a region of the file (mark it unused) some specialized file types may need to know freed regions. More...

const char *	io_type () const
	Identifies the type of I/O implementation. More...

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_cmpl)
	Schedules an asynchronous read request to the file. More...

request_ptr	awrite (void *buffer, offset_type pos, size_type bytes, const completion_handler &on_cmpl)
	Schedules an asynchronous write request to the file. More...

virtual int	get_queue_id () const
	Returns the identifier of the file's queue. More...

virtual int	get_allocator_id () const
	Returns the file's allocator. More...

Public Member Functions inherited from file
void	add_request_ref ()

void	delete_request_ref ()

int	get_request_nref ()

virtual int	get_physical_device_id () const

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

virtual void	remove ()

Additional Inherited Members
Public Types inherited from file
enum	open_mode { RDONLY = 1, WRONLY = 2, RDWR = 4, CREAT = 8, DIRECT = 16, TRUNC = 32, SYNC = 64, NO_LOCK = 128 }
	Definition of acceptable file open modes. More...

typedef request::offset_type	offset_type

typedef request::size_type	size_type

Static Public Attributes inherited from file
static const int	DEFAULT_QUEUE = -1

static const int	NO_QUEUE = -2

static const int	NO_ALLOCATOR = -1

Protected Member Functions inherited from file
	file ()
	Initializes file object. More...

Detailed Description

Implementation of file based on new[] and memcpy.

Constructor & Destructor Documentation

inline

constructs file object

Parameters

disk	disk(file) identifier

virtual

Discard a region of the file (mark it unused) some specialized file types may need to know freed regions.

Reimplemented from file.

const char * mem_file::io_type ( ) const

virtual

Identifies the type of I/O implementation.

Returns: pointer to null terminated string of characters, containing the name of I/O implementation

Reimplemented from file.

void mem_file::lock ( )

virtual

Locks file for reading and writing (acquires a lock in the file system)

Implements file.

void mem_file::set_size ( offset_type newsize )

virtual

Changes the size of the file.

Parameters

newsize new file size

Implements file.

file::offset_type mem_file::size ( )

virtual

Returns size of the file.

Implements file.

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