Where and when? Link please?

Here and now.

Until you demonstrate it it is unfounded.

More explicity: 

thread 1        thread 2
--------------  --------------
tmp=refcount+1
                tmp=refcount+1
                refcount=tmp
refcount=tmp

[download]

The vertical axis is time.

You are stating on the record that you are totally unaware that Perl protects its internals with internal locking?

Yes. Are you saying it does?

You are stating outright that if I search this site I won't find a single occasion when you have indicated your knowledge of that internal locking?

To the best of my knowledge, yes.

In reply to Re^9: is ||= threadsafe? by ikegami
in thread is ||= threadsafe? by perl-diddler

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.