The PID file also serves another purpose: it allows external resources to communicate with the service in a specified manner.
I would say, that's the only
reason to use PID files. There's no need to use PID files to prevent simultaneous access to resources; for that, lock files are enough. And if all you care about is preventing concurrent running of the same program (which is what the OP needs), all you need to do is obtain a lock on yourself (no external files needed):
flock DATA, LOCK_EX or die "Another instance is already running";
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
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:
Outside of code tags, you may need to use entities for some characters:
- 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
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||