Detailed Description

Implementation of file based on the Linux kernel interface for asynchronous I/O.

Definition at line 34 of file linuxaio_file.h.

Inheritance diagram for stxxl::linuxaio_file:

Collaboration diagram for stxxl::linuxaio_file:

Public Member Functions
	linuxaio_file (const std::string &filename, int mode, int queue_id=DEFAULT_LINUXAIO_QUEUE, int allocator_id=NO_ALLOCATOR, unsigned int device_id=DEFAULT_DEVICE_ID, int desired_queue_length=0)
	Constructs file object. More...

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

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

int	get_desired_queue_length () const

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

void	serve (void *buffer, offset_type offset, size_type bytes, request::request_type type)

Public Member Functions inherited from stxxl::ufs_file_base
	~ufs_file_base ()

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

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

bool	is_device () const
	return true if file is special device node More...

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

void	set_size (offset_type newsize)

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

void	unlink ()
	unlink file without closing it. More...

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

virtual	~file ()

void	add_request_ref ()
	increment referenced requests More...

virtual request_ptr	aread (void *buffer, offset_type pos, size_type bytes, const completion_handler &on_cmpl=completion_handler())=0
	Schedules an asynchronous read request to the file. More...

virtual request_ptr	awrite (void *buffer, offset_type pos, size_type bytes, const completion_handler &on_cmpl=completion_handler())=0
	Schedules an asynchronous write request to the file. More...

void	delete_request_ref ()
	decrement referenced requests More...

virtual 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...

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...

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

virtual void	serve (void *buffer, offset_type offset, size_type bytes, request::request_type type)=0

virtual void	set_size (offset_type newsize)=0
	Changes the size of the file. More...

Public Member Functions inherited from stxxl::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=completion_handler())

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

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

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

Private Attributes
int	desired_queue_length

Additional Inherited Members
Public Types inherited from stxxl::file
typedef request::offset_type	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 }
	Definition of acceptable file open modes. More...

typedef request::size_type	size_type
	the size of a request More...

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

static int	truncate (const char *path, external_size_type length)
	truncate a path to given length. Use this only if you dont have a fileio-specific object, which provides truncate(). More...

Static Public Attributes inherited from stxxl::file
static const unsigned int	DEFAULT_DEVICE_ID = (unsigned int)(-1)

static const int	DEFAULT_LINUXAIO_QUEUE = -2

static const int	DEFAULT_QUEUE = -1

static const int	NO_ALLOCATOR = -1

Protected Member Functions inherited from stxxl::ufs_file_base
	ufs_file_base (const std::string &filename, int mode)

void	_after_open ()

void	_set_size (offset_type newsize)

offset_type	_size ()

void	close ()

Protected Attributes inherited from stxxl::ufs_file_base
mutex	fd_mutex

int	file_des

const std::string	filename

bool	m_is_device
	is special device node More...

int	m_mode

Protected Attributes inherited from stxxl::file
unsigned int	m_device_id
	The file's physical device id (e.g. used for prefetching sequence calculation) More...

atomic_counted_object	m_request_ref
	count the number of requests referencing this file More...

Constructor & Destructor Documentation

stxxl::linuxaio_file::linuxaio_file	(	const std::string &	filename,
		int	mode,
		int	queue_id = `DEFAULT_LINUXAIO_QUEUE`,
		int	allocator_id = `NO_ALLOCATOR`,
		unsigned int	device_id = `DEFAULT_DEVICE_ID`,
		int	desired_queue_length = `0`
	)

inline

Constructs file object.

Parameters

filename	path of file
mode	open mode, see `stxxl::file::open_modes`
queue_id	disk queue identifier
allocator_id	linked disk_allocator
device_id	physical device identifier
desired_queue_length	queue length requested from kernel

Definition at line 49 of file linuxaio_file.h.

Member Function Documentation

request_ptr stxxl::linuxaio_file::aread	(	void *	buffer,
		offset_type	pos,
		size_type	bytes,
		const completion_handler &	on_cmpl = `completion_handler()`
	)

Definition at line 22 of file linuxaio_file.cpp.

request_ptr stxxl::linuxaio_file::awrite	(	void *	buffer,
		offset_type	pos,
		size_type	bytes,
		const completion_handler &	on_cmpl = `completion_handler()`
	)

Definition at line 35 of file linuxaio_file.cpp.

int stxxl::linuxaio_file::get_desired_queue_length ( ) const

inline

Definition at line 69 of file linuxaio_file.h.

const char * stxxl::linuxaio_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

Implements stxxl::file.

Definition at line 58 of file linuxaio_file.cpp.

void stxxl::linuxaio_file::serve	(	void *	buffer,
		offset_type	offset,
		size_type	bytes,
		request::request_type	type
	)

Definition at line 48 of file linuxaio_file.cpp.

References stxxl::request_interface::wait().

Member Data Documentation

int stxxl::linuxaio_file::desired_queue_length

private

Definition at line 39 of file linuxaio_file.h.

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

include/stxxl/bits/io/linuxaio_file.h
lib/io/linuxaio_file.cpp

Detailed Description

Public Member Functions

Private Attributes

Additional Inherited Members

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation