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# ACE_POSIX_Asynch_Write_Dgram Class Reference

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

`#include <POSIX_Asynch_IO.h>`

Inheritance diagram for ACE_POSIX_Asynch_Write_Dgram:

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Collaboration diagram for ACE_POSIX_Asynch_Write_Dgram:

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List of all members.

## Public Methods

| ACE_POSIX_Asynch_Write_Dgram (ACE_POSIX_Proactor *posix_proactor)
| Constructor.
virtual | ~ACE_POSIX_Asynch_Write_Dgram (void)
| Destructor.
virtual ssize_t | send (ACE_Message_Block *message_block, size_t &number_of_bytes_sent, int flags, const ACE_Addr &addr, const void *act, int priority, int signal_number)

## Protected Methods

| ACE_POSIX_Asynch_Write_Dgram (void)
| Do-nothing constructor.

## Detailed Description

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

Once <open> is called, multiple asynchronous <writes>s can started using this class. A ACE_Asynch_Write_Stream::Result will be passed back to the <handler> when the asynchronous write completes through the <ACE_Handler::handle_write_stream> callback.

## Constructor & Destructor Documentation

ACE_POSIX_Asynch_Write_Dgram::ACE_POSIX_Asynch_Write_Dgram | ( | ACE_POSIX_Proactor * | posix_proactor | ) |

| Constructor.

ACE_POSIX_Asynch_Write_Dgram::~ACE_POSIX_Asynch_Write_Dgram | ( | void |  | ) | `[virtual]`

| Destructor.

ACE_POSIX_Asynch_Write_Dgram::ACE_POSIX_Asynch_Write_Dgram | ( | void |  | ) | `[protected]`

| Do-nothing constructor.

## Member Function Documentation

ssize_t ACE_POSIX_Asynch_Write_Dgram::send | ( | ACE_Message_Block * | message_block,
|  | size_t & | number_of_bytes_sent,
|  | int | flags,
|  | const ACE_Addr & | addr,
|  | const void * | act,
|  | int | priority,
|  | int | signal_number
| ) | `[virtual]`

This starts off an asynchronous send. Up to <message_block->total_length()> will be sent. <message_block>'s <rd_ptr> will be updated to reflect the sent bytes if the send operation is successful completed. Return code of 1 means immediate success and number_of_bytes_sent is updated to number of bytes sent. The <ACE_Handler::handle_write_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.

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. <signal_number> is a no-op on non-POSIX4 systems.

Implements ACE_Asynch_Write_Dgram_Impl.

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

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