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Date: -- (:)
From: Frédéric_Gava <gava@u...>
Subject: Re: [Caml-list] interprocess mutex
Hi,

you could also used threads. It is easier.
http://caml.inria.fr/ocaml/htmlman/manual038.html

After you could used "Mutex", "Condition" and "Event" to synchronise your
threads...

To synnchronise true "process", you could used "waitpid".

Regards,
Frédéric Gava



> Hello,
>
> I need to sequentialize two processes accessing the same GDBM database
> (OCaml's dbm library).  Since GDBM allows for only one writer at a time,
> I need a way to block until the previous writer has finished.  I think
> there is a way to do this with the original GDBM library since it claims
> to handle the file lockings properly -- I could block based on the
> returned error codes.  However, this functionality does not appear to be
> exposed through the Dbm module.
>
> Of course I can implement this blocking myself with an interprocess
> mutex.  But how can I implement such a mutex in OCaml?  I couldn't find
> anything from the standard library that would resemble my problem.
>
> Is it easily doable or do I need to go and start hacking C code?  I've
> never done it on Unix but I know it's easily done on Windows.
>
> Thanks in advance,
> Janne
>
> P.S.  I'm using GDBM merely as a cache between process invocations, so
> using a more heavyweight DB is out of the question.
>
>
>
>
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