Hi, can someone explain what happens when you fork from a thread? In my case the script will get stuck. Sample code that will not finish: 
#!/usr/bin/perl
use threads;

sub something_1 {
  my $thr;
  foreach (1..10){
    my $q = threads->create(\&something_2, $_);
    $thr->{$_} = $q;
  }
  while (1) {
    foreach (keys %$thr) {
      if ($thr->{$_}->is_joinable()){
    $thr->{$_}->join();
    delete $thr->{$_};
      }
    }
    print "trying:". (scalar keys %$thr)."\n";
    last if not scalar keys %$thr;
    sleep 1;
  }
}

sub something_2 {
  my $a = shift;
  my $pid = fork();
  if ($pid==0) {
    print "cocot $a\n";
    exit(0);
  } else {
    waitpid($pid, 0);
    print "done $a\n";
  }
}

# my $q = threads->create(\&something_1);
something_1;

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Also I think I understand the following error, but can I get a clean exit somehow? 
Perl exited with active threads:
    9 running and unjoined
    0 finished and unjoined
    0 running and detached

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EDIT post a simpler example. the original one was with a fork from a thread from a thread

In reply to problems with fork from thread by cristi1979

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