Beefy Boxes and Bandwidth Generously Provided by pair Networks
P is for Practical

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
Hi all

I need to implement a cron daemon which runs jobs such as sending emails, clearing caches, updating search indexes etc.

The whole daemony forky thing is foreign to me. I've spent some time looking at Proc::Daemon, Schedule::Cron, perlipc etc, but I'm a bit confused as to where to begin and what is possible/easy.

Essentially, what I want to achieve is:

Dispatcher daemon - allows modules to register with it - when a job is scheduled, calls the job and forks -- job tries to obtain a lock -- if it fails, count++ if count > max --> warn -- if lock obtained -- run job to completion -- appends messages to a log shared by all jobs -- unlock -- exit -- if receives a SIGINT -- stops all forked children -- exits
The forked process should not share data with the parent process, and each time a job starts, it should start with a fresh slate - this I assume is an 'of course' with fork, but what if there were just SOME data that I would like to be loaded only once and shared with the forked processes, is this possible?

The details I can figure out, but some pointers would be appreciated.

many thanks

In reply to A perl daemon by clinton

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, 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, 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.
  • Log In?

    What's my password?
    Create A New User
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others lurking in the Monastery: (3)
    As of 2021-04-19 02:24 GMT
    Find Nodes?
      Voting Booth?

      No recent polls found