You might try something like this untested code. Also see controlling threads with Tk: while loop vs. signals
# catch window close button to clean up threads
$mw->protocol('WM_DELETE_WINDOW' => sub { &clean_exit });
sub clean_exit{
my @running_threads = threads->list;
if (scalar(@running_threads) < 1){print "\nFinished\n";exit}
else{
# $die = 1; # a shared var I usually use
# to tell threads to return
foreach my $thr (@running_threads){
$thr->join;
}
exit;
}
}
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