ACE_Asynch_Read_Dgram_Impl Class Reference

Abstract base class for all the concrete implementation classes that provide different implementations for the ACE_Asynch_Read_Dgram. More...

#include <Asynch_IO_Impl.h>

Inheritance diagram for ACE_Asynch_Read_Dgram_Impl:

Collaboration diagram for ACE_Asynch_Read_Dgram_Impl:

List of all members.

Public Member Functions
virtual	~ACE_Asynch_Read_Dgram_Impl (void)
virtual ssize_t	recv (ACE_Message_Block *message_block, size_t &number_of_bytes_recvd, int flags, int protocol_family, const void *act, int priority, int signal_number)=0
Protected Member Functions
	ACE_Asynch_Read_Dgram_Impl (void)
	Do-nothing constructor.

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Detailed Description

Abstract base class for all the concrete implementation classes that provide different implementations for the ACE_Asynch_Read_Dgram.

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Constructor & Destructor Documentation

ACE_Asynch_Read_Dgram_Impl::~ACE_Asynch_Read_Dgram_Impl

(

void

)

[virtual]

ACE_Asynch_Read_Dgram_Impl::ACE_Asynch_Read_Dgram_Impl

(

void

)

[protected]

Do-nothing constructor.

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Member Function Documentation

virtual ssize_t ACE_Asynch_Read_Dgram_Impl::recv	(	ACE_Message_Block *	message_block,
		size_t &	number_of_bytes_recvd,
		int	flags,
		int	protocol_family,
		const void *	act,
		int	priority,
		int	signal_number
	)		[pure virtual]

This starts off an asynchronous read. Upto <message_block->total_size()> will be read and stored in the message_block. message_block's <wr_ptr> will be updated to reflect the added bytes if the read operation is successful completed. Return code of 1 means immediate success and <number_of_bytes_recvd> will contain number of bytes read. The <ACE_Handler::handle_read_dgram> method will still be called. Return code of 0 means the IO will complete proactively. Return code of -1 means there was an error, use errno to get the error code.

Scatter/gather is supported on WIN32 by using the <message_block->cont()> method. Up to ACE_IOV_MAX message_block's are supported. Upto <message_block->size()> bytes will be read into each <message block>=""> for a total of <message_block->total_size()> bytes. All message_block's <wr_ptr>'s will be updated to reflect the added bytes for each message_block

Priority of the operation is specified by priority. On POSIX4-Unix, this is supported. Works like <nice> in Unix. Negative values are not allowed. 0 means priority of the operation same as the process priority. 1 means priority of the operation is one less than process. And so forth. On Win32, priority is a no-op. signal_number is the POSIX4 real-time signal number to be used for the operation. signal_number ranges from ACE_SIGRTMIN to ACE_SIGRTMAX. This argument is a no-op on non-POSIX4 systems.

Implemented in ACE_POSIX_Asynch_Read_Dgram.

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

• Asynch_IO_Impl.h
• Asynch_IO_Impl.cpp