Hope this helps. It worked for me with AS Perl 5.8.4 and Windows XP.

use Tk;
use Tk::ROText;
use threads;
use Thread::Queue;

use strict;
use warnings;

my $mw = MainWindow->new();
my $t = $mw->Scrolled('ROText', -width => 40, -height=>20, -scrollbars
+=>"e")->pack();
my $b = $mw->Button(-command => sub {threads->create(\&cook)}, -text=>
+"Click")->pack();
my $q = Thread::Queue->new();

$t->after(1000, \&eat);
MainLoop;


sub eat {
    while (my $l = $q->dequeue_nb()) {
        $t->insert('end', $l); 
        $t->update();
    }
    $t->after(1, \&eat);
}

sub cook {
    print "thread created\n";
    my ($in, $out);
    open($in, "e.pl |");
    while (<$in>) {
        print "got $_"; 
        $q->enqueue($_);
    } 
    close($in);
}
[download]

Here is the other process I used:

use strict;
use warnings;

for (1..10000000) {
    print $_, "\r\n";

}
[download]