From: Wejn <lists+rubytalk@...>
Date: 2002-11-06T01:25:31+09:00
Subject: Re: UDPSocket - bidirectional communication through one socket?

>  Well, probably UDP is not the best ...

Well, for my project UDP is just one of the transports. BTW, TCP on *fast*
networks scales really *bad*. It's congestion avoidance/control algorithms
aren't good for the "slow ends, fast core" networks. My goal is to write
first (test only) implementation of the protocol stack for active routers
- and it must have UDP as one of its transports (at the end it would have
to be completely protocol independent, but that's another story).
 
>  How do you use ::select ?

u = UDPSocket.new
u.bind('0.0.0.0', ARGV[0])
# part of thread1 (reader):
loop do
  s = select([u], nil, nil, 0.01)
  next if s.nil? or s[0].size.zero?
  x = u.recvfrom(65535)
  # ... processing here
end
# ... and here comes the rest - second thread2 (writer), ...

> <snipped code here>

Well ... that's great ... but I need to use just one host:port pair for
each endpoint and that's (imho) the problem. I'm unable to use 'u' from
the example above to simultaneously reading from/writing to network. :(
If there's no possibility to use it in the way:

     host1:X <---------------------> host2:X

i'll have to use the (bad) model:
    
      host1:X ----------------------> host2:Y
      host1:Y <---------------------- host2:X

but I'm still trying to avoid that, if possible.

W.
-- 
              Wejn <lists+rubytalk(at)box.cz>
(svamberk.net's Linux section, fi.muni.cz student, linuxfan)
>>>         Bored?  Want hours of entertainment?         <<<
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