use strict;
use warnings;

my @array1 = funct_array($par1,$par2,$filename);
my %hash1 = funct_hash($par1,$par2,$par3,$filename);
# there are more tables/lists like this

# then followed process that
# takes the pre-generated value from @array1 and %hash1.
# Thus both @array1 and %hash1 must be completed first.

#  Subroutine list

sub funct_array {
    my ($p1,$p2,$fn) = @_;
    my @array_result;
    # Run some time consuming process
    return @array_resutlt;
}

sub funct_hash{
    my ($p1,$p2,$fn) = @_;
    my %hash_result;
    # Run some time consuming process
    return %hash_resutlt;
}


##</code><code>##

use strict;
use warnings;
use threads;
use Data::Dumper;

my $array1 = threads->new(\&funct_array,($par1,$par2,$filename));
my $hash1 = threads->new(\&funct_hash,($par1,$par2,$par3,$filename));

# Then I tried to see the content of the array
# with Data Dumper

print Dumper $array->join;
print Dumper $hash1->join;

# But I couldn't see any value of @array1 and 
# %hash1 that I can use for the later process

#  Subroutine list

sub funct_array {
    my ($p1,$p2,$fn) = @_;
    my @array_result;
    # Run some time consuming process
    return @array_resutlt;
}

sub funct_hash{
    my ($p1,$p2,$fn) = @_;
    my %hash_result;
    # Run some time consuming process
    return \%hash_resutlt;
}