sub new {
    my $class = shift;
    #my $this = { 'field' => 1 };
    my $this = { };
    bless ($this,$class);
    tie $this->{'field'},'IPC::Shareable','kali';
    $this->{'field'} = 1;
    return ($this);
}
...
sub DO_newchild 
   {
    my $this = shift;
    if ($pid = fork)
    { #parent
        # $this->{'field'} = $newvalue;
        $num_children++;
        print 'parent '.$$.' | '.$this->{'field'}."\n";
        return;
    }
    else{
         #my $newvalue;
         #tie $newvalue,"IPC::Shareable",'kali';
         #Children can not return from this subroutine
         $SIG{INT} = 'DEFAULT';    #make SIGINT kill us as it did before
          while(1) {
            sleep 2;
            print 'child '.$$.' | '.$this->{'field'}."\n";
            #$newvalue = time();
            $this->{'field'} = time;
          }
      }
   exit;
}