sub pullDataFromDbWithDirectory {
    my $_dir = $_[0];

    if ($itemCount <= $maxNumberOfItems) {
        my @retval = grep { /^Dir|^File/ } qx($omnidb -filesystem $filesystem  '$label'  -listdir '$_dir');

        foreach my $item (@retval) {
            $itemCount++;
            (my $filename = $item) =~ s/^File\s+|^Dir\s+|\n//g;
            my $file = "$_dir/$filename";
            push(@data,$file);

            if ($item =~ /^Dir/) {
                $worker->enqueue($file);
                print "Add $file to queue\n" if $debug;
            }
        }
    }
}

sub doOperation () {
    my $ithread = threads->tid();
    do {
       my $folder = $worker->dequeue();
       print "Read $folder from queue with thread $ithread\n" if $debug;
       pullDataFromDbWithDirectory($folder);
   } while ($worker->pending());

   push(@IDLE_THREADS,$ithread);

}