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# 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:

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Collaboration diagram for ACE_Asynch_Read_Dgram_Impl:

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List of all members.

## Public Methods

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 Methods

| ACE_Asynch_Read_Dgram_Impl (void)
| Do-nothing constructor.

## Detailed Description

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

## 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.

## 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, and ACE_WIN32_Asynch_Read_Dgram.

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

- /export2/deucetmp/bala/release_try/ACE_wrappers/ace/Asynch_IO_Impl.h
- /export2/deucetmp/bala/release_try/ACE_wrappers/ace/Asynch_IO_Impl.cpp