This example might show you a way. One thing you might be missing is that the thread must reach the end of it's code block, or return, before it can be joined. So I usually use a shared var 'die' to signal a thread to return immediately. That way, if you want to exit without all those warnings, you set the 'die' = 1 for each thread, then join them after they have returned.

In the following example, I join them as they finish, but you can easily hold them in an unjoined condition, until all threads are done. I don't know why you would want that, but it would be easy to do.

#!/usr/bin/perl 
use warnings; 
use strict; 
use threads; 
use threads::shared; 
 
$| = 1;

my %threads;

foreach (1..10){
  share $threads{$_}{'die'};
  share $threads{$_}{'data'};
  $threads{$_}{'die'} = 0;
  $threads{$_}{'data'} = 0;
}

foreach (1..10) {
    $threads{$_}{'thread'} = threads->new('StartTest');
}

my @threads = (1..10);
while(1){
  foreach my $t (@threads){
        if($threads{$t}{'data'} > 5){
             $threads{$t}{'die'} = 1;
             $threads{$t}{'thread'}->join;
             @threads =  grep { $_ != $t } @threads;
        }
     }
if(scalar @threads == 0){last}
}

print "\n", "All threads done\n";
########################################################## 

sub StartTest {
    my $self = threads->self;

    print "Thread ", $self->tid, " started\n";

    while(1){
    if( $threads{$_}{'die'} == 1){return}
       else{
           print "From thread $self->",$threads{$_}{'data'}++,"\n";
           sleep 1;
        };
    }

    print "Thread ", $self->tid, " ending\n";
}
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