It is possible to pass result to parent process, and is quite easy. You can use Parallel::ForkManager for example: 
use 5.010;
use strict;
use warnings;

use Parallel::ForkManager;
use Data::Printer;

my $pm = Parallel::ForkManager->new(2);

$pm->run_on_finish(
    sub {
        # result from the child will be passed as 6th arg to callback
        my $res = $_[5];
        p $res;
    }
);

for (1..3) {
    $pm->start and next;
    # from here and till $pm->finish child process running
    # do something useful and store result in $res
    my $res = { aaa => $_ };
    # this will terminate child and pass $res to parent process
    $pm->finish(0, $res);
}

$pm->wait_all_children;

[download]

In reply to Re^3: Threads memory consumption by zwon
in thread Threads memory consumption by mojo2405

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.