Based on your previous questions1, you are probably talking about threads. As Corion pointed out, Thread::Queue provides queue functionality to threads. According to its documentation (reformatted for brevity):

Any data types supported by threads::shared can be passed via queues: a) Ordinary scalars, b) Array refs, c) Hash refs, d) Scalar refs, e) Objects based on the above. Ordinary scalars are added to queues as they are.

If not already thread-shared, the other complex data types will be cloned (recursively, if needed, …

Your question here is very vague (please read How do I post a question effectively?), but taking your meaning of "two dimensional queues" as literally as I can, I believe a simple anonymous array ref (constructed with  [ ... ]) would work for you. Something like this:

use Thread::Queue;

my $q = Thread::Queue->new;

# Later, in producer thread(s) ($first and $second
# represent the 2 dimensional tuple you wish to enqueue)
$q->enqueue( [ $first, $second ] ); # Anonymous array ref

# Later still, to signal the end of all elements:
$q->enqueue(undef);

# In the consumer thread(s):
while (defined (my $ref = $q->dequeue)) {
    my ($first, $second) = @$ref;   # Dereference array
    # ... Process $first and $second
}

[download]

That's pretty much the pattern. You should be able to easily adapt it to your needs. If not, write up a better description of what you need, and we'll help you from there.

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1. meena's recent threads: Create your own signal in Perl, Alarm In Perl

In reply to Re: How to create a two dimensional queue in Perl by rjt
in thread How to create a two dimensional queue in Perl by meena

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