#!/usr/bin/perl
use IO::Handle;
use strict;
use warnings;

my $pos= tell *DATA;

  my $x= IO::Handle->new();
  $x->fdopen(fileno(DATA), "r");
  seek $x, $pos, 0;
  print "Start c $pos\n";
  #sleep 4;
  while (<$x>) {
    print "c: $_"; #sleep 1;
  }
  print "stop c\n";
  my $y= IO::Handle->new();
  $y->fdopen(fileno(DATA), "r");
  seek $y, $pos, 0;
  print "Start p $pos\n";
  while (<$y>) {
    print "p: $_"; #sleep 1;
  }
  print "stop p\n";
__DATA__
a
b
c
d
e