My problem is that threads::shared can't share complex data structures and objects. How can this be solved?

use threads;
use threads::shared;

use Devel::Pointer;

{
  package foo;
  sub new { bless [rand 100] }
  sub blah { print "in blah()\n" }
}

my $obj = foo->new();
$obj->blah();
print "$obj: @$obj\n";

my $o : shared = address_of($obj);
$t = threads->new(sub {
  print "\tin thread\n\t";
  my $obj2 = deref($o);
  $obj2->blah();
  print "\t$obj2: @$obj2\n";
});
$t->join;

__output__

in blah()
foo=ARRAY(0x804beec): 43.5769482822256
        in thread
        in blah()
        foo=ARRAY(0x804beec): 43.5769482822256
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broquaint