If Parallel::Queue's threading worked for me I'd suggest the following.

use threads::shared;
use Parallel::Queue;

print concatenate_parallel( ['a' .. 'z'], 4 ) . "\n";

sub concatenate_parallel {
    my $result :shared;
    my @input = map {
        my $string = $_;
        sub {
            $result .= $string;
        };
    } @{ shift @_ };
    my $max_threads = shift @_;

    my $mgr = Parallel::Queue->construct( 'thread' );
    $mgr->runqueue( $max_threads, @input );

    return $result;
}

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In reply to Re: using parallel processing to concatenate a string, where order of concatenation doesn't matter by diotalevi
in thread using parallel processing to concatenate a string, where order of concatenation doesn't matter by tphyahoo

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