ACE_POSIX_Asynch_Read_Dgram Class Reference

This class is a factory for starting off asynchronous reads on a UDP socket. More...

#include <POSIX_Asynch_IO.h>

Inheritance diagram for ACE_POSIX_Asynch_Read_Dgram:

Collaboration diagram for ACE_POSIX_Asynch_Read_Dgram:

List of all members.

Public Member Functions
	ACE_POSIX_Asynch_Read_Dgram (ACE_POSIX_Proactor *posix_proactor)
	Constructor.
virtual	~ACE_POSIX_Asynch_Read_Dgram (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)
Protected Member Functions
	ACE_POSIX_Asynch_Read_Dgram (void)
	Do-nothing constructor.

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Detailed Description

This class is a factory for starting off asynchronous reads on a UDP socket.

Once <open> is called, multiple asynchronous <read>s can be started using this class. An ACE_Asynch_Read_Dgram::Result will be passed back to the <handler> when the asynchronous reads completes through the <ACE_Handler::handle_read_stream> callback.

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Constructor & Destructor Documentation

ACE_POSIX_Asynch_Read_Dgram::ACE_POSIX_Asynch_Read_Dgram

(

ACE_POSIX_Proactor *

posix_proactor

)

Constructor.

ACE_POSIX_Asynch_Read_Dgram::~ACE_POSIX_Asynch_Read_Dgram

(

void

)

[virtual]

ACE_POSIX_Asynch_Read_Dgram::ACE_POSIX_Asynch_Read_Dgram

(

void

)

[protected]

Do-nothing constructor.

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Member Function Documentation

ssize_t ACE_POSIX_Asynch_Read_Dgram::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
	)		[virtual]

This method queues an asynchronous read. Up to message_block->total_size() bytes will be read and stored in the message_block beginning at its write pointer. The message_block write pointer will be updated to reflect any added bytes if the read operation is successful completed. 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. signal_number argument is a no-op on non-POSIX4 systems.

Note:

Unlike the Windows version of this facility, no indication of immediate success can be returned, and number_of_bytes_read is never used.

• flags Not used.
• protocol_family Not used.

  Return values:

  0	The IO will complete asynchronously.
  -1	There was an error; see errno to get the error code.

Implements ACE_Asynch_Read_Dgram_Impl.

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

• POSIX_Asynch_IO.h
• POSIX_Asynch_IO.cpp