use strict;
use threads;
use threads::shared;
use Math::BigInt;
use Data::Dump qw[ pp ];
use feature qw(say);

my @numbers = ( 1 .. 10 );

my %result : shared;

my @threads = map {
    threads->create( \&process, $_ );
} @numbers;

$_->join for @threads;

for my $key ( sort{ $a <=> $b } keys %result ) {
    say "$key : ", $result{ $key }, ' => ', $result{ $key }->bstr;
}

sub process {
    my $number    = shift;
    my $factorial = factorial($number);
    lock %result;
    $result{$number} = shared_clone( $factorial ); ## clone the object
}

sub factorial {
    my $number = shift;
    Math::BigInt->bfac($number);
}