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";
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|