[Boost-users] multiple or single joins on asio socket

Subject: [Boost-users] multiple or single joins on asio socket
From: Lee MacDonald (lee.macdonald_at_[hidden])
Date: 2009-10-22 05:42:27

Guys,
 
I have a application running on Linux using boost 1.35, that receives
packets to several different multicast addresses, but on the same port
and interface.  For each different multicast address I perform the
following:
 
// create a new socket 
socket_(ioService) 

// set the listen end point to that of the multicast address and port 

boost::asio::ip::udp::endpoint listenEndPoint(multicastAddress.to_v4(),
port);

// we need to be able to reuse the underlyling socket created as more
than one asio socket will share it.

socket_.set_option(boost::asio::ip::udp::socket::reuse_address(true));

socket_.bind(listenEndPoint);

// perform the actual join to the multicast group

socket_.set_option(boost::asio::ip::multicast::join_group(destAddress.to
_v4(), interfaceAddress.to_v4())); 

So I bind to a seperate asio socket instance for each multicast address
and then perform a join to that address, hence each asio socket only has
a single join associated with it.  
 
Is a better approach to have a single asio socket instance and perform a
join for each multicast address that shares the port & interface?  If
so, how would I set listenEndPoint? Is there any performance differences
between the two?  Are there better approaches?
 
Thanks.
 
Lee MacDonald
 

 
Schneider Trading
4th Floor,
25 Copthall Avenue
London EC2R 7BP

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