package p1;

our $var1 = 'var1-p1';#Note the change my->our

sub new {
    my $class = ref $_[0] ? ref shift : shift;
    my $self = {};
    bless $self, $class;
    return $self;
}

sub get_var1 {
    return $var1;
}

1;

##</code><code>##

package p2;

use p1;

our @ISA=qw(p1);

sub set_var1 {
    my $self = shift;
    my $new_var1 = shift;
    $p1::var1 = $new_var1;
    return $p1::var1;
}

1;