Re: [MacPerl] Any issues with multiple processes on cgis?

[wbsnipes@nando.net (Will Snipes)]

Here's a little perl module semaphore.pm that will help you out.

It creates a semaphore file in a predetermined directory (which you
need to change for your system) and lets you test that file to see
if it exists.  Using this you can lock out changes to a file for
multiprocessing.

It works with MacPerl and Unix perl both above version 5.
Use check_sem.pl to test it and see how it works.

Regards,
Will

>Does anyone know if there is a potential problem with a cgi perl script
>opening a dbm file  due to possible multiple simultaneous users?
>
>I think the basic question is, is it possible to get multiple instances of
>the same Perl script trying to open the same file, or do scripts run to
>completion before another web request can be processed? (Or is this server
>dependent?  I develop on Mac but scripts run on Unix).
>
>I'm using dbm files that the scripts use read-only, but I have to give
>read/write permission to get them to open successfully on the server I'm
>running on. I'm worried about collisions if two instances of the same
>script get running simultaneously.
>
>--John Springer
> _______________________________________________________________________
> |        Can you use a creative, Internet-savvy marketing guy?        |
> |      Check Me Out at <http://www.scruznet.com/~springer/HireMe>     |
> |                                                                     |
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Will Snipes                          wbsnipes@intersol.org