One possible solution to your problem would be to have a DBF file with a list of all files that are currently locked. The files themselves would not be locked via flock() but access to the DBF file would be gated through flock().
Advantage: locks will be maintained even if your server/client crashes and is then restarted;
Disadvantage: having all processes use the same file may create a bottleneck. To minimize the probability of this happening, make sure the DBF file is locked only when necessary.

Hope this helps.

--perlplexer

In reply to Re: Using flock() on files by perlplexer
in thread Using flock() on files by SiMac

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