Re: Installing MLDBM::Sync, prerequisite to Apache::ASP

 
On Tuesday, October 14, 2008, at 08:41AM, "Vorländer, Martin" <[email protected]> wrote:
>Hi everybody!
>
>Has anybody here tried to install Apache::ASP with HP's 5.8.6 distribution?
>
>As far as I can see, it tries to use MLDBM for (state data) storage,
>wrapped in MLDBM::Sync for multi-process access. And that one is too
>unixy for VMS, I suppose (it uses flock(), and generates lots of errors
>during MMS TEST, naturally).
>
>Any hints?

I haven't tried what you're doing, but Perl 5.10 on VMS 8.3 or later supports flock() via emulation using the locking flags of fcntl().  That's probably the only way this would have a prayer of working out of the box.

There is also always the traditional answer to the question, "How do you lock a file on VMS?"  Answer: "Open it.'  That can be made as explicit as you like with:

my $fh = VMS::Stdio::vmsopen('file.dat', 'shr=nil');

If you're not having enough fun yet you could try writing your own MLDBM::Sync that subclasses VMS::IndexedFile and uses RMS record locks, but I'm not at all sure you get fine enough control of record-level locking that way.