Ruby subthread stdout

test1.rb

require 'open3'

puts "test1.rb"

Open3.popen3("ruby test2.rb") do |stdin, stdout, stderr, wait_thr|
  while line = stdout.gets do
    puts line
  end
end

test2.rb

require 'socket'

puts "#{Time.now}"
puts "Starting socket server..."

server = TCPServer.new 2000
loop do
  client = server.accept
  client.puts "Time is #{Time.now}"
  while line = client.gets
    puts line.chomp
    break if line =~ /^\s*$/
  end
  client.close
  break
end