Dear wise monks,
sorry if that is a stupid question but I'm a biologist rather than a coder... I want to analyze some biological data. Therefore, I need to read and analyze 4 large files before I can actually analyze my own data. To save time I would like to read the 4 files in parallel using Parallel::Forkmanager. My problem is that I have no idea (even after google search) how to return the data back to the parent. Each subroutine generates a lot of different data structures such as hashes and arrays that I need later on in the parent process. Below is the code that I currently try. 
use Parallel::ForkManager;
$threads=4;
if($threads==1)
    {
    read_genome();
    read_mapfile();
    read_GTF();
    read_RM();
    }
else
    {
    @eval_code=("read_genome();","read_mapfile();","read_GTF();","read
+_RM();");
    my$pm=new Parallel::ForkManager($threads);
    foreach$eval_code(@eval_code)
        {
        $pm->start and next;
        eval$eval_code;
        $pm->finish;
        }
    $pm->wait_all_children;
    }

sub read_genome
    {
    # do something
    }
sub read_mapfile;
    {
    # do something
    }
sub read_GTF
    {
    # do something
    }
sub read_RM
    {
    # do something
    }

# use data generated in the subroutines

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In reply to Return all the data from child to parent with Parallel::Forkmanager by Microcebus

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