The only direct-from-the-OP way I can think of to avoid copying is to create a set of manipulation routines in C, which is capable of directly addressing the shared memory, and call those from Perl to do anything with the data.

One other idea, depending how picky you are about your definition of "shared memory" ... instead of using explicit shared memory, use data segments in a shared library. This will create access to the functions in the library and function names will get copied (e.g. using P5NCI::Library), but provided you use the right C-compiler directives when declaring the data, the operating system (*) will only load one copy of those segments into memory, irrespective of concurrent users.

(update * I say "the operating system" but I take it from various clues that it's Unix of course ;))

__________________________________________________________________________________

^M Free your mind!

In reply to Re: Share hash across processes by Moron
in thread Share hash across processes by bmac888

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.