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while( my $node = $Qjob->dequeue ) {
    if( $node->{canBeSet} ) {
...
        $Q->enqueue( $node ); ## push back for next time.
    }
}

sub killThread{
    my $self = shift;
...
        my $amtInQ = $queue->pending();
        last if $done && $amtInQ == 0;
        ...

sub killThread{
    $queue->enqueue( undef );
}

while( 1 ) {
    my $node = $queue->dequeue; 
...
        $Q->enqueue( $node ); ## push back for next time.
    }
}