Implementation of some file methods based on serving_request. More...

Inheritance diagram for disk_queued_file:

Collaboration diagram for disk_queued_file:

Public Member Functions
	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
virtual void	serve (const request *req)=0 throw (io_error)

void	add_request_ref ()

void	delete_request_ref ()

int	get_request_nref ()

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

virtual offset_type	size ()=0
	Returns size of the file. More...

virtual int	get_physical_device_id () const

virtual void	lock ()=0
	Locks file for reading and writing (acquires a lock in the file system) 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)

virtual void	remove ()

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

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 some file methods based on serving_request.

Member Function Documentation

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

virtual

Schedules an asynchronous read request to the file.

Parameters

buffer	pointer to memory buffer to read into
pos	file position to start read from
bytes	number of bytes to transfer
on_cmpl	I/O completion handler

Returns: request_ptr request object, which can be used to track the status of the operation

Implements file.

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

virtual

Schedules an asynchronous write request to the file.

Parameters

buffer	pointer to memory buffer to write from
pos	starting file position to write
bytes	number of bytes to transfer
on_cmpl	I/O completion handler

Returns: request_ptr request object, which can be used to track the status of the operation

Implements file.

virtual int disk_queued_file::get_allocator_id ( ) const

inlinevirtual

Returns the file's allocator.

Implements file.

virtual int disk_queued_file::get_queue_id ( ) const

inlinevirtual

Returns the identifier of the file's queue.

Remarks: Files allocated on the same physical device usually share the same queue

Implements file.

Referenced by aread(), and awrite().

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