Hello Monks,
Apologies if this question is deemed absurd, but can someone tell me why I am not able to pass a string or reference to the run_on_finish sub?

This code: 

#!usr/bin/perl

use Parallel::ForkManager;

my $MAX_PROCESSES=10;

$pm = new Parallel::ForkManager($MAX_PROCESSES);

$pm->run_on_finish(
    sub {
      my ($pid, $exit_code, $ident, $signal, $core) = @_;
      print "$pid $exit_code $ident $signal $core\n";
    }
  );

foreach ( a .. f ) {
  my $pid = $pm->start($_) and next;
  my $exit_code = 40;
  $pm->finish($exit_code);
}

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predictably produces this: 
20151 40 a 0 0
20152 40 b 0 0
20153 40 c 0 0
20154 40 d 0 0
20155 40 e 0 0

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change:
  my $exit_code = 40;

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to 
  my $exit_code = 'forty';

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and you get:
20963 0 a 0 0
20965 0 c 0 0
20966 0 d 0 0
20967 0 e 0 0

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or: 
  my $exit_code = \'forty';

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and you get: 
22040 192 a 0 0
22041 192 b 0 0
22042 192 c 0 0
22043 192 d 0 0
22044 192 e 0 0

[download]
Just wondering.
There are other ways to do what I need to do (of course, it's Perl) but I'd love to know what is happening here.
D

In reply to passing string/refs to run_on_finish with Parallel::ForkManager by digdoug

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