From: James Croft <crofty_james@...>
Date: 2007-12-15T23:38:27+09:00
Subject: Question about sockets/listeners

hi, i'm very new to ruby and so i'd be very grateful of any help on
this.  I am writing a script that listens for UDP packets on a
particular port.  This is very easy using 'socket'.  I then want to make
a script that simulates lots of clients sending UDP packets to the
listener.  These clients should send a UDP packet from a particular port
and then listen for a response on that same port.  For this reason, I am
trying to run each simulated client in a different thread.  A simplified
version of what i have done so far is shown below, however, when I run
this, the client stops sending packets after the 66th one.  Can someone
explain this to me please?  why is it stopping at 66?  which limit am i
hitting?

Also, any suggestions on how to improve the code will be gratefully
received.  Thanks

#### Listener.rb ####
require "socket"

socket = UDPSocket.open
socket.bind("",1500)

while true
  message, details = socket.recvfrom(512)
  p message
end


#### Clients.rb ####
require 'socket'

SERVER_IP = "127.0.0.1"
SERVER_PORT = 1500

packets=[]
threads =[]
# Build an array of packets
for i in 1..100
  packets << "packet#{i}"
end

# For Packet to be sent, start a new thread
for packets_to_send in packets
  sleep 0.1
  threads << Thread.new(packets_to_send) do |packet|

  #Generate a random port
  port = rand(60000)

  # Open a socket on that port
  socket = UDPSocket.open
    socket.bind("",port)

  # Send the packet
  puts "Sending #{packet}"
  socket.send(packet, 0, SERVER_IP, SERVER_PORT)

  while true
    message, message_details = socket.recvfrom(512)
  end

  end
end
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