lupin.rb

require 'socket'

def say(*args)
  STDOUT.puts *args
  STDOUT.flush
end

Thread.abort_on_exception = true

s1 = TCPServer.new("127.0.0.1", 9000)

say "Before s1#accept"
s1_t = Thread.new do
  begin
    s1.accept
  rescue Exception => err
    say "s1#accept raised #{err.inspect}"
  end
end

say "After s1#accept thread block"

say "Sleeping for 10 seconds"
sleep 10

say "Closing s1"
s1.close
say "Waiting for s1 thread to join()"
s1_t.join
say "s1 thread joined"

exit 0