in reply to Re^2: How to call two programs simultaneously from a running program
in thread How to call two programs simultaneously from a running program

use threads;
use threads::shared;
...
my $Bresults:shared;
async {
    $Bresults = `perl B.pl`;
}->detach;

my $Cresults = `perl C.pl`;

sleep 1 until defined $Bresults;

my $Dresults = `perl D.pl $Bresults $Cresults`;

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