stxxl::request Class Reference

Detailed Description

Request object encapsulating basic properties like file and offset.

Definition at line 38 of file request.h.

Inheritance diagram for stxxl::request:

Collaboration diagram for stxxl::request:

Public Member Functions
	request (const completion_handler &on_compl, file *file, void *buffer, offset_type offset, size_type bytes, request_type type)
virtual	~request ()
void	check_alignment () const
void	check_errors ()
	Rises an exception if there were error with the I/O. More...
void	error_occured (const char *msg)
	Inform the request object that an error occurred during the I/O execution. More...
void	error_occured (const std::string &msg)
	Inform the request object that an error occurred during the I/O execution. More...
void *	get_buffer () const
file *	get_file () const
offset_type	get_offset () const
size_type	get_size () const
request_type	get_type () const
virtual const char *	io_type () const
	Identifies the type of I/O implementation. More...
std::ostream &	print (std::ostream &out) const
	Dumps properties of a request. More...
Public Member Functions inherited from stxxl::request_interface
virtual	~request_interface ()
virtual bool	add_waiter (onoff_switch *sw)=0
virtual bool	cancel ()=0
	Cancel a request. More...
virtual void	delete_waiter (onoff_switch *sw)=0
virtual bool	poll ()=0
	Polls the status of the request. More...
virtual void	wait (bool measure_time=true)=0
	Suspends calling thread until completion of the request. More...
Public Member Functions inherited from stxxl::atomic_counted_object
	atomic_counted_object ()
	new objects have zero reference count More...
	atomic_counted_object (const atomic_counted_object &)
	coping still creates a new object with zero reference count More...
	~atomic_counted_object ()
bool	dec_reference () const
	Call whenever resetting (i.e. overwriting) a pointer to the object. IMPORTANT: In case of self-assignment, call AFTER inc_reference(). More...
unsigned_type	get_reference_count () const
	Return the number of references to this object (for debugging) More...
void	inc_reference () const
	Call whenever setting a pointer to the object. More...
atomic_counted_object &	operator= (const atomic_counted_object &)
	assignment operator, leaves pointers unchanged More...
bool	unique () const
	Test if the counted_object is referenced by only one counting_ptr. More...

Protected Member Functions
void	check_nref (bool after=false)
Protected Member Functions inherited from stxxl::request_interface
virtual void	completed (bool canceled)=0
virtual void	notify_waiters ()=0

Protected Attributes
void *	m_buffer
size_type	m_bytes
compat_unique_ptr < stxxl::io_error >::result	m_error
file *	m_file
offset_type	m_offset
completion_handler	m_on_complete
request_type	m_type

Private Member Functions
void	check_nref_failed (bool after)

Additional Inherited Members
Public Types inherited from stxxl::request_interface
typedef stxxl::external_size_type	offset_type
enum	request_type { READ, WRITE }
typedef stxxl::internal_size_type	size_type

Constructor & Destructor Documentation

stxxl::request::request	(	const completion_handler &	on_compl,
		file *	file,
		void *	buffer,
		offset_type	offset,
		size_type	bytes,
		request_type	type
	)

Definition at line 21 of file request.cpp.

References stxxl::file::add_request_ref(), stxxl::atomic_counted_object::get_reference_count(), m_file, and STXXL_VERBOSE3_THIS.

stxxl::request::~request ( )

virtual

Definition at line 39 of file request.cpp.

References stxxl::atomic_counted_object::get_reference_count(), and STXXL_VERBOSE3_THIS.

Member Function Documentation

void stxxl::request::check_alignment

(

)

const

Definition at line 44 of file request.cpp.

References m_buffer, m_bytes, m_offset, STXXL_BLOCK_ALIGN, and STXXL_ERRMSG.

Referenced by stxxl::serving_request::serving_request().

void stxxl::request::check_errors ( )

inline

Rises an exception if there were error with the I/O.

Definition at line 88 of file request.h.

void stxxl::request::check_nref ( bool  after = false )

inlineprotected

Definition at line 97 of file request.h.

Referenced by stxxl::serving_request::serve().

void stxxl::request::check_nref_failed ( bool  after )

private

Definition at line 60 of file request.cpp.

References stxxl::atomic_counted_object::get_reference_count(), stxxl::file::io_type(), m_buffer, m_bytes, m_file, m_offset, m_type, stxxl::request_interface::READ, and STXXL_ERRMSG.

void stxxl::request::error_occured ( const char *  msg )

inline

Inform the request object that an error occurred during the I/O execution.

Definition at line 75 of file request.h.

Referenced by stxxl::serving_request::serve().

void stxxl::request::error_occured ( const std::string &  msg )

inline

Inform the request object that an error occurred during the I/O execution.

Definition at line 82 of file request.h.

void* stxxl::request::get_buffer ( ) const

inline

Definition at line 64 of file request.h.

file* stxxl::request::get_file ( ) const

inline

Definition at line 63 of file request.h.

Referenced by stxxl::disk_queues::add_request().

offset_type stxxl::request::get_offset ( ) const

inline

Definition at line 65 of file request.h.

size_type stxxl::request::get_size ( ) const

inline

Definition at line 66 of file request.h.

request_type stxxl::request::get_type ( ) const

inline

Definition at line 67 of file request.h.

Referenced by stxxl::request_queue_impl_qwqr::add_request(), and stxxl::request_queue_impl_qwqr::cancel_request().

const char * stxxl::request::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::request_interface.

Reimplemented in stxxl::serving_request.

Definition at line 75 of file request.cpp.

References stxxl::file::io_type(), and m_file.

std::ostream & stxxl::request::print ( std::ostream &  out ) const

virtual

Dumps properties of a request.

Implements stxxl::request_interface.

Definition at line 80 of file request.cpp.

References m_buffer, m_bytes, m_file, m_offset, m_type, and stxxl::request_interface::READ.

Referenced by stxxl::operator<<().

Member Data Documentation

void* stxxl::request::m_buffer

protected

Definition at line 48 of file request.h.

Referenced by check_alignment(), check_nref_failed(), print(), and stxxl::serving_request::serve().

size_type stxxl::request::m_bytes

protected

Definition at line 50 of file request.h.

Referenced by check_alignment(), check_nref_failed(), print(), and stxxl::serving_request::serve().

compat_unique_ptr<stxxl::io_error>::result stxxl::request::m_error

protected

Definition at line 44 of file request.h.

file* stxxl::request::m_file

protected

Definition at line 47 of file request.h.

Referenced by check_nref_failed(), stxxl::serving_request::io_type(), io_type(), print(), request(), and stxxl::serving_request::serve().

offset_type stxxl::request::m_offset

protected

Definition at line 49 of file request.h.

Referenced by check_alignment(), check_nref_failed(), print(), and stxxl::serving_request::serve().

completion_handler stxxl::request::m_on_complete

protected

Definition at line 43 of file request.h.

request_type stxxl::request::m_type

protected

Definition at line 51 of file request.h.

Referenced by check_nref_failed(), print(), and stxxl::serving_request::serve().

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

• include/stxxl/bits/io/request.h
• lib/io/request.cpp