hmm, i think ive got my answer here
so for join(), that should be something like

use threads;
my @kiddies;

foreach(1..10) 
{
     print "$$ starting loop $_";
    
    push @kiddies, threads->new(\&thisWasAnElse);

    print "$$ exiting loop $_";
}

sub thisWasAnElse 
{
    print "\tchild ", threads->tid() " created ok";
    sleep(int(rand(10)));
    print "\tchild", threads->tid() , " done, outta here";
}  

foreach @kiddies { $_->join(); }
[download]

can i safely detach() inside the first foreach loop?

well the downloads complete, so lets see what happens...