use strict;
use warnings;

use MCE::Shared;

tie my @data, 'MCE::Shared';

if ( ! defined ( my $pid = fork() ) ) {
   die "Cannot fork!: $!";
}
elsif ( $pid == 0 ) {
   # Child
   my $item;
   sleep 1;

   for ( my $i = 1; $i <= 10; $i++ ) {
      $item = shift @data;
      $item = '' if ( ! defined $item );

      print "Child: $item\n";
   }
}
else {
   # Parent
   for ( my $i = 1; $i <= 10; $i++ ) {
      push @data, $i;
      print "Parent: @data\n";
   }

   waitpid( $pid, 0 );
}