mem_file Class Reference [File implementations]

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

#include <mem_file.h>

Inheritance diagram for mem_file:

Collaboration diagram for mem_file:

List of all members.

Public Member Functions
	mem_file (int disk=-1)
	constructs file object
request_ptr	aread (void *buffer, stxxl::int64 pos, size_t bytes, completion_handler on_cmpl)
	Schedules asynchronous read request to the file.
request_ptr	awrite (void *buffer, stxxl::int64 pos, size_t bytes, completion_handler on_cmpl)
	Schedules asynchronous write request to the file.
stxxl::int64	size ()
	Returns size of the file.
void	set_size (stxxl::int64 newsize)
	Changes the size of the file.
void	lock ()
	Locks file for reading and writing.
void	delete_region (int64 offset, unsigned_type size)
	Some specialized file types may need to know freed regions.

---

Detailed Description

Implementation of file based on new[] and memcpy.

---

Constructor & Destructor Documentation

mem_file::mem_file

(

int

disk = -1

)

constructs file object

Parameters:

disk

disk(file) identifier

---

Member Function Documentation

request_ptr mem_file::aread	(	void *	buffer,
		stxxl::int64	pos,
		size_t	bytes,
		completion_handler	on_cmpl
	)			[virtual]

Schedules asynchronous read request to the file.

Parameters:

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

Returns:

request_ptr object, that can be used to track the status of the operation

Implements file.

References request_ptr::get(), and file::get_id().

request_ptr mem_file::awrite	(	void *	buffer,
		stxxl::int64	pos,
		size_t	bytes,
		completion_handler	on_cmpl
	)			[virtual]

Schedules 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 object, that can be used to track the status of the operation

Implements file.

References request_ptr::get(), and file::get_id().

void mem_file::delete_region	(	int64	offset,
		unsigned_type	size
	)			[virtual]

Some specialized file types may need to know freed regions.

Reimplemented from file.

void mem_file::lock

(

)

[virtual]

Locks file for reading and writing.

Reimplemented from file.

void mem_file::set_size

(

stxxl::int64

newsize

)

[virtual]

Changes the size of the file.

Parameters:

newsize

value of the new file size

Implements file.

stxxl::int64 mem_file::size

(

)

[virtual]

Returns size of the file.

Returns:

file size in bytes

Implements file.

---

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

• mem_file.h
• mem_file.cpp