my $var :shared;
$var = 1;              # ok
$var = [];             # error
$var = &share([]);     # ok

##</code><code>##

my %hash :shared = ( ... );
$DataQueue->enqueue(\%hash);

##</code><code>##

# Fixed as per BrowserUK's reply.
# Initialization must be done after share.
my $href = share({});
%$href = ( ... );
$DataQueue->enqueue($href);

##</code><code>##

use Storable qw( freeze thaw );
my %hash = ( ... );
$DataQueue->enqueue(freeze(\%hash));