Re: Non blocking socket query.

From: Lawrie (stroker_ace_at_hotmail.com)
Date: 04/08/05 

Date: 8 Apr 2005 02:01:26 -0700

> I had a similar problem. The solution was to create a separate
persistent
> send
> data buffer for each socket connection. I would then use select to
> determine
> if any socket was ready to accept send data and then send as much as
I
> could.
> This solution requires that you do your own housekeeping on send
buffers,
> and
> you must periodically check (using select) to see if any more data
can be
> sent.

Okay, let me see If I have got this.

Inside my main loop I am doing two things:

1. Reading messages from input queue and adding them to each sockets
output buffer (Each socket instance is wrapped in a structure with
containing output buffer, status info etc).

2. Call select() with a short timeout. If any sockets are writeable
write as much data as possible to the socket.

Or in pseudo code:

do {

   check_input_queue;

   if (message arrived) {
      add_message_to each_sockets_output_buffer;
   }

   call select() with small timout.

   if (any socket is writeable)
   {
      write_as_much_data_as_possible_to_socket;
   )

} while (!fatal error)

I have one additional question:

I have set my sockets to write only using the shut function because I
want to prevent remote applications sending data to me. Is there any
way using select of detecting a remote disconnect?

Many thanks

Lawrie

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