Okay, I spoke too soon. Accessing a hash defined in the parent IS read/writable from run_on_finish(). 

my %rc_hash         = ();
my $MAX_PROCESSES    = 120;
my $pm = new Parallel::ForkManager($MAX_PROCESSES);
    
$pm->run_on_finish(
     sub { 
      my ($pid, $exit_code, $ident) = @_;
         print "run_on_finish: $ident (pid: $pid) exited " . "with cod
+e: [$exit_code]\n";
    $rc_hash{$pid} = $exit_code;
         }
);

$pm->run_on_start(
      sub {
          my ($pid,$ident)=@_;
          print "** $ident started, pid: $pid\n";
       }
 );

for(my $i=0; $i< @hosts; $i++){
          $pm->start($hosts[$i]) and next;   
           system(@some_command);
           $return_code = $? >> 8;
           $pm->finish($return_code);
}

foreach my $key (keys %rc_hash){
      print "$key => $rc_hash{$key}\n";
}

[download]

I made an incorrect assumption.. What I was trying to do earlier is use a database handle from run_on_finish() and that didn't work, so I thought it applied to all other variables. I am not sure why accessing a hash would work, but accessing a db handle wouldn't. Is this possible? 

my $dbh    = DBI->connect("DBI:mysql:database=mydb;host=$DB", "user", 
+"pass", {'RaiseError' => 1});
my $MAX_PROCESSES  = 120;
my $pm = new Parallel::ForkManager($MAX_PROCESSES);
    
$pm->run_on_finish(
     sub {
            my ($pid, $exit_code, $ident) = @_;       
            print "run_on_finish: $ident (pid: $pid) exited " . "with 
+code: [$exit_code]\n";
    insert_into_db(\$dbh, $pid, $exit_code);      
+    
          }
);
     $pm->run_on_start(
               sub {
                   my ($pid,$ident)=@_;
                   print "** $ident started, pid: $pid\n";
               }
               );

    for(my $i=0; $i< @hosts; $i++){
          $pm->start($hosts[$i]) and next;   
           system(@some_command);
           $return_code = $? >> 8;
           $pm->finish($return_code);
        }
$dbh->disconnect();

sub insert_into_db{
  my $dbhdl     = shift;
  my $pid       = shift;
  my $ret_code  = shift;

  $$dbhdl->do(INSERT INTO system_results ... .. );
}

[download]

If I can't use the db handle from run_on_finish(), I can still add the return code to %rc_hash and process them after $pm->finish(). Is this the right thing to do? thanks for the speedy responses. I hope I explained my problem a little better this time around.

In reply to Re^2: Parallel::ForkManager run_on_finish exit code handler by sojourn548
in thread Parallel::ForkManager run_on_finish exit code handler by sojourn548

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.