If you don't need to share any variables or anything, my Async::Event::Interval can help you. It forks off a separate process and performs work outside of the main process based on a callback subroutine within the script (you can name this sub whatever you want). Here's a basic example. The 1 in the call to new() is how often the event fires, in seconds (floating point seconds work), so for 30 minutes, you'd put 1800. The callback sub is the work you want the event to do. I've tested it on Strawberry perl v5.24.1, and the same version on Linux.

use warnings;
use strict;

use Async::Event::Interval;
 
my $event
    = Async::Event::Interval->new(1, \&callback);
 
$event->start;

my $c = 1;

while (1){
    print "$c: in the main process...\n";
    $c++;
    sleep 10;
}

sub callback {
    print "we're alive!\n";
}
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Output:

1: in the main process...
we're alive!
we're alive!
we're alive!
we're alive!
we're alive!
we're alive!
we're alive!
we're alive!
we're alive!
we're alive!
2: in the main process...
we're alive!
we're alive!
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