From: "Frédéric Gava" <gava@univ-paris12.fr>
To: "Janne Hellsten" <janne@hybrid.fi>, <caml-list@yquem.inria.fr>
Subject: Re: [Caml-list] interprocess mutex
Date: Wed, 16 Feb 2005 20:37:09 +0100 [thread overview]
Message-ID: <006301c5145e$e83fbde0$0100a8c0@mshome.net> (raw)
In-Reply-To: <421395A4.3030909@hybrid.fi>
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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prev parent reply other threads:[~2005-02-16 19:35 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-16 18:49 Janne Hellsten
2005-02-16 19:06 ` [Caml-list] " Alex Baretta
2005-02-16 19:59 ` Janne Hellsten
2005-02-16 19:37 ` Frédéric Gava [this message]
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