$$ which i'm thinking can be reset at one point or another.

As long as you're on a system that uses incremental process ID's, you will probably be safe. Process ID's cycle when the maximum has been reached (I think it's 65535 on my system) when they're incremental, but forking that often in a single second is very unlikely.

However, Not all PIDs are simple incremental. Some are randomly chosen, and in that case, especially with short running scripts, you have a greater chance of having two identical IDs.

My concern doesn't deal with $^T

It contains the start time of the program (read: interpreter), which can cause problems if your interpreter is a long running interpreter like mod_perl or one of the many fast-perl-CGI things that avoid forking interpreters. Better is to use time, which returns the current time. 

- Yes, I reinvent wheels.
- Spam: Visit eurotraQ.

In reply to Re: method of ID'ing by Juerd
in thread method of ID'ing by Parham

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.