You don't want a semaphore.
The simplest mechanism is:
while( my $workitem = sourceOfWork() ) {
sleep 1 while $Q->pending > MAXQ;
$Q->enqueue( $workitem );
}
Thanks, that looks to be a much more sensible approach compared with what I was doing with semaphores.
That should teach me to read algorithoms online that are intened for other languages or problem domains where near realtime responses are required.
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