use forks;
my $fork1 = async { return subroutine($param1, $param2); };
my $fork2 = async { return subroutine($param3, $param4); };
my $return1 = $fork1->join();
my $return2 = $fork2->join();
But there's no need for two forks.
use forks;
my $fork1 = async { return subroutine($param1, $param2); };
my $return2 = subroutine($param3, $param4);
my $return1 = $fork1->join();
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