# This child thread builds an encoded array of valid pairs.
#  "valid pairs" do not have any of the same bits set.
# Output format is row1_integer:row2_integer
my $DataQueue = Thread::Queue->new();
my ($thr) = threads->create({'context' => 'list'}, sub
{
	# I tried to use a shared hash of hashes, but the required work to explicity define the hash of hashes in the manner required by threads::shared was just too expensive.
	use integer;
	# This thread uses queues to get its parameter.
	my @ValidPairs=();
	my @output=();
	while (my $validNum = $DataQueue->dequeue())
	{
		!($validNum & $_) and push @output, $validNum .':'.$_ foreach (@ValidPairs);
		push (@ValidPairs, $validNum ); #must add number to this thread's list of valid numbers
	}
	return (@output);
});

#... Inside loop and logic to build numbers
	  # send this new number to the child thread waiting on queued parameters.
	  # The child thread builds the array of valid pairs 
	  $DataQueue->enqueue($i);
#... After block that builds the numbers
$DataQueue->enqueue(undef); #tell the child process to finish what has been queued and then exit.
my @encodedPairedNumbers = $thr->join();

#subsequent code decodes our encoded paired numbers into a hash of hashes