#! perl -slw use strict; use threads ( stack_size => 4096 ); use Thread::Conveyor; my $belt = Thread::Conveyor->new( { maxboxes => 50, minboxes => 25, optimize => 'memory', # or 'cpu' }); async{ print while defined( $_ = $belt->take ); }->detach; $belt->put( $_ ) for 1 .. 10; $belt->put( undef );