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  1. or download this
    while ( !$stat{'done'} ) {
    if ( my $msg = $queue_up->dequeue() ) {
  2. or download this
    while ( !$stat{'done'} ) {
    if ( my $msg = $queue_up->dequeue_nb() ) {
...
        sleep 1; ## Use usleep or select for better responsiveness
    }
}