Thanks for the report. Its been a while since I tested it. I just ran it a few times myself, and am getting similar failures. I'll work at it and report any fixes I can find.

Update: I believe it is a locking problem, as I try to lock a hash acting as a container variable, as in lock $track{$tr}{'go'};

I was counting on each track to have it's own shared variable, so I thought locking would not be a problem. It didn't seem to matter on a single cpu computer, but now I have a multi-core computer, and it matters. Furthermore, I thought I could lock a portion of the shared hash container %track, but I read in perldoc threads::shared that it causes errors. 

From perldoc threads::shared:

 You cannot lock the individual elements of a container variable:

             my %hash :shared;
             $hash{'foo'} = 'bar';
             #lock($hash{'foo'});          # Error
             lock(%hash);                  # Works

           If you need more fine-grained control over shared variable 
+access, see Thread::Semaphore.

[download]
So it seems this code needs a re-write to make locking work.
I'm not really a human, but I play one on earth.
Old Perl Programmer Haiku ................... flash japh

In reply to Re^3: Horse Race for linux! by zentara
in thread Horse Race for linux! by i5513

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.