use threads;
use threads::shared;
{
    package A;
    use threads;
    use threads::shared;
    sub new {
        my $class = shift;
    	my $self = &share({});
      	print "Created $class at $self\n";
        return bless $self, $class;
    }
    sub get_s {
    }
    sub DESTROY {
        print "Destroy $_[0]\n";
    }
}

my $a :shared;
$a  = A->new();
for (1..2) {
    async {
        print "thread start\n";
        $a->get_s();
    }->join();
}