ACE_Asynch_Operation Class Reference

This is an interface base class for all asynch operations. The resposiblility of this class is to forward all methods to its delegation/implementation class, e.g., ACE_WIN32_Asynch_Operation or ACE_POSIX_Asynch_Operation. More...

#include <Asynch_IO.h>

Inheritance diagram for ACE_Asynch_Operation:

Public Member Functions
int	open (ACE_Handler &handler, ACE_HANDLE handle, const void *completion_key, ACE_Proactor *proactor)
int	cancel (void)
ACE_Proactor *	proactor (void) const
	Return the underlying proactor. More...
virtual	~ACE_Asynch_Operation (void)
	Destructor. More...

Protected Member Functions
	ACE_Asynch_Operation (void)
	Constructor. More...
virtual ACE_Asynch_Operation_Impl *	implementation (void) const =0
	Return the underlying implementation class. More...
ACE_Proactor *	get_proactor (ACE_Proactor *user_proactor, ACE_Handler &handler) const
	Get a proactor for/from the user. More...

Detailed Description

This is an interface base class for all asynch operations. The resposiblility of this class is to forward all methods to its delegation/implementation class, e.g., ACE_WIN32_Asynch_Operation or ACE_POSIX_Asynch_Operation.

There are some attributes and functionality which is common to all asychronous operations. The delegation classes of this class will factor out this code.

Constructor & Destructor Documentation

ACE_Asynch_Operation::~ACE_Asynch_Operation ( void  )

virtual

Destructor.

ACE_Asynch_Operation::ACE_Asynch_Operation ( void  )

protected

Constructor.

Member Function Documentation

int ACE_Asynch_Operation::cancel

(

void

)

(Attempts to) cancel the asynchronous operation pending against the {handle} registered with this Operation.

All completion notifications for the I/O operations will occur normally.

= Return Values:

-1 : Operation failed. (can get only in POSIX). 0 : All the operations were cancelled. 1 : All the operations were already finished in this handle. Unable to cancel them. 2 : Atleast one of the requested operations cannot be cancelled.

There is slight difference in the semantics between NT and POSIX platforms which is given below.

= Win32 :

cancels all pending accepts operations that were issued by the calling thread. The function does not cancel asynchronous operations issued by other threads. All I/O operations that are canceled will complete with the error ERROR_OPERATION_ABORTED.

= POSIX:

Attempts to cancel one or more asynchronous I/O requests currently outstanding against the {handle} registered in this operation. For requested operations that are successfully canceled, the associated error status is set to ECANCELED.

ACE_Proactor * ACE_Asynch_Operation::get_proactor ( ACE_Proactor *  user_proactor, ACE_Handler &  handler  ) const

protected

Get a proactor for/from the user.

virtual ACE_Asynch_Operation_Impl* ACE_Asynch_Operation::implementation ( void  ) const

protectedpure virtual

Return the underlying implementation class.

Implemented in ACE_Asynch_Write_Dgram, ACE_Asynch_Read_Dgram, ACE_Asynch_Transmit_File, ACE_Asynch_Connect, ACE_Asynch_Accept, ACE_Asynch_Write_File, ACE_Asynch_Read_File, ACE_Asynch_Write_Stream, and ACE_Asynch_Read_Stream.

int ACE_Asynch_Operation::open	(	ACE_Handler &	handler,
		ACE_HANDLE	handle,
		const void *	completion_key,
		ACE_Proactor *	proactor
	)

Initializes the factory with information which will be used with each asynchronous call. If ({handle} == ACE_INVALID_HANDLE), {ACE_Handler::handle} will be called on the {handler} to get the correct handle.

ACE_Proactor * ACE_Asynch_Operation::proactor

(

void

)

const

Return the underlying proactor.

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

• Asynch_IO.h
• Asynch_IO.cpp