There is a deadlock condition

I'm sorry, but I see no mention in that post of the term "deadlock", nor anything that I recognise as pertaining to it?

Indeed, to my reading, it confirms exactly what I said above. That if blocking IO is in progress, signals won't be seen until (and unless) the IO completes:

The sleep() function is especially implemented to return early when we receive an emulated signal (including a fake SIGALARM from our alarm() emulation).

But if you uncomment the accept() call, then the program will just hang forever instead (unless someone actually connects to the socket, of course).

That signals don't interrupt IO is neither a 'deadlock', nor an issue specific to pseudo-forks. It is purely a limitation of the signals implementation.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^4: Proposal how to make modules using fork more portable by BrowserUk
in thread Proposal how to make modules using fork more portable by Anonymous Monk

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.