tye predicts PEBKAC
Tell your friend, "Where's your code?". Fourth-party debugging without the code involved seems likely doomed. Posting a node about this seems like it really shouldn't have been your next step.
I like fcntl-based locks better than flock, so you could ask your friend to try using those instead (just in case flock is just fundamentally broken on his copy of Perl). See fcntl, Fcntl, and File::FcntlLock.
Update: http://www.nntp.perl.org/group/perl.perl5.porters/2009/04/msg145477.html was interesting, if perhaps more tangential than on-target here.
- tye
In reply to Re: Lightweight Solution To "Only 1 Process Running" On AIX (fcntl)
by tye
in thread Lightweight Solution To "Only 1 Process Running" On AIX
by Limbic~Region
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