A circular buffer is a specific implementation of a queue which has the following features:

• If you have one reader and one writer working in parallel, there is no need for locking.
• No need for memory allocation.
• O(1) insertion at the tail and O(1) removal from the head.

All of these features are offered by a plain array based queue in Perl (see below), so I don't see the point of implementing a circular buffer in Perl unless its faster (but I doubt that).

my @q;
while (@q) {
   my $item = shift(@q);  # Insertion
   ...
   push @q, ...;          # Removal
   ...
}
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