thank you very much for your precious advice, and the example code. to give you an update on my code, as i've done it so far: 
sub event_handler {
   my $worker_thread = sub { 
          my $row = shift;
          my $event = SOD::EventCooker->new($row);
          if (exists $p_ids{$row->{'ev_p_id'}}) {
             lock $sessions{$p_ids{$row->{'ev_p_id'}}};
             my $session = thaw sessions{$p_ids{$row->{'ev_p_id'}}};
             $event->evaluate($session->{PLAYER}->{GAMESTATS});
             $sessions{$p_ids{$row->{'ev_p_id'}}} = freeze $session;
          }
          else {
             $event->evaluate;
          }
      };

   my $dist_thread = sub { 
          my @threads;
          my $thread_time = time;
          my $dbh = DBI->connect("DBI:mysql:database=$appdata{DBBASE}"
+, $appdata{DBUSER}, $appdata{DBPASS},
          { RaiseError => 1, AutoCommit => 1 }) || die $dbh->errstr;
          my $res = $dbh->selectall_hashref("SELECT * FROM event WHERE
+ ev_time<=$thread_time", 'ev_time');
          $dbh->do("DELETE FROM event WHERE ev_time<=$thread_time"); 

          map {
              push @threads, threads->new($worker_thread->($res->{$_})
+);
          } sort keys(%$res);
          map {
             $_->detach;
          } @threads;
          $dbh->disconnect;
          undef $dbh;
      };
   
   while (1) {
      sleep 1;
      last if $tflag;
      threads->new($dist_thread)->detach;
   }   
}

[download]
i assume that a combination of our two approaches might be sufficient even for time of high traffic & loads.

language is a virus from outer space.

In reply to Re^2: a question on threads by thcsoft
in thread a question on threads by thcsoft

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.