From: Abhinav Saxena <abhinav061@...>
Date: 2009-09-11T19:08:23+09:00
Subject: Re: Global Mutex?

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I used something like this using "ln -s" system command. Used to work great=
,
so if you want a simple approach and implementation you can use it. One
catch: if the process which has the lock dies in between, you will have to
ensure locks are properly released.

BTW, "ln -s" approached worked with processes running on multiple machines
as well. But yes, all the machines had access to a small common working
directory.

Thanks,
Abhinav
--
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On Wed, Aug 26, 2009 at 8:31 PM, Brian Candler <b.candler@pobox.com> wrote:

> Aryk Grosz wrote:
> > Is there any thing in ruby that acts as a global mutex?
>
> Between multiple processes on the same machine: I'd suggest using
> File#flock on a local file (this probably won't work over NFS) with
> File::LOCK_EX. You can include File::LOCK_NB if you want to test the
> lock but not block if someone else has it.
>
> Between multiple processes on multiple machines: probably run a DRb
> server one one machine which has a local mutex and yields back to the
> caller.
> --
> Posted via http://www.ruby-forum.com/.
>
>

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