Some simple stuff first:

• IO::Socket sets the socket to autoflush, so all your ->flush() are useless.

• $nonblocking = 1;
  ioctl($sock, 0x8004667e, \$nonblocking);
  [download]

  is an awful way of writing

  $sock->blocking(0);
  [download]

If I understand correctly, your problem is that two writes in quick succession end up being picked up by the second read of two reads in quick succession. If you consider that a problem, you're doing something majorly wrong. Maybe we can help you fix your actual problem if you tell us about it.

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