If I comment out the print line in

while ($threadCount)
{
    my $engine = $dataQueue->dequeue;
    my $content = $dataQueue->dequeue;
    #print "$engine returned: $content\n";
    $threadCount --;
}
[download]

I frequently get error (warning?) "A thread exited while two threads were running".

I am a thread newbie and don't know why this is happening, nor how "bad" this is, or if it's bad at all.

You may want to check back at What is the fastest way to download a bunch of web pages? where BrowserUK does something similar which doesn't give this warning. At least, not yet.

At any rate, thanks for giving me something to get my fingers dirty with in thread world.