From: Brian Candler <b.candler@...>
Date: 2009-08-27T00:01:06+09:00
Subject: Re: Global Mutex?

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.
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