Did you read about what join does? It blocks. Try 

use threads;
my $thr = threads->create ( sub { for (5..10) { print $_,"\n";
                                   sleep(1);}});
my $thr2 = threads->create ( sub { for (10..19) { print $_,"\n";}});
$thr2->join();
$thr->join();

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In reply to Re: Thread parallel execution (join blocks) by Anonymous Monk
in thread Thread parallel execution by arunbhargav

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