Thank you for your quick reply! I've looked into Parallell::ForkManager and IPC::Shareable but unfortunately they use Storable to exchange data (even worse, forkmanager writes Storable data onto disk :)) Then I've found subs::parallel which looks promising, and AFAIK doesn't use serialization.

  use Data::Dumper;
  use subs::parallel;

  my $baz = parallelize {
    my $h = {foo => 3};
    return $h;
  }; # returns immediately


  $baz and 1; # blocks
  print Dumper $baz;
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