use strict;
use warnings;
use MCE::Child;
use Time::HiRes qw(sleep time);

STDOUT->autoflush(1);

sub background {
    my $id = shift;
    while (1) {
        MCE::Child->yield(0.200);
        print "Inside child #${id} ", time, $/;
        sleep 0.1;   # simulate work
    }
}

MCE::Child->create(\&background, $_) for 1..2;

for (1..5) {
    print "Parent ", $_, $/;
    sleep 1;
}

$_->kill->join for MCE::Child->list;

##</code><code>##

$ perl demo2.pl 
Parent 1
Inside child #1 1646276375.98194
Inside child #2 1646276376.18194
Inside child #1 1646276376.38187
Inside child #2 1646276376.58187
Inside child #1 1646276376.78162
Parent 2
Inside child #2 1646276376.98187
Inside child #1 1646276377.18188
Inside child #2 1646276377.38187
Inside child #1 1646276377.58188
Inside child #2 1646276377.78186
Parent 3
Inside child #1 1646276377.98187
Inside child #2 1646276378.18187
Inside child #1 1646276378.38187
Inside child #2 1646276378.58187
Inside child #1 1646276378.78187
Parent 4
Inside child #2 1646276378.98187
Inside child #1 1646276379.18188
Inside child #2 1646276379.38187
Inside child #1 1646276379.58187
Inside child #2 1646276379.78187
Parent 5
Inside child #1 1646276379.98187
Inside child #2 1646276380.18187
Inside child #1 1646276380.38188
Inside child #2 1646276380.58187
Inside child #1 1646276380.78187