From: Charles Oliver Nutter <headius@...>
Date: 2012-06-26T10:23:46+09:00
Subject: Re: Is "a,b=c,d" atomic? or do I need a Mutex?

On Sun, Jun 10, 2012 at 11:51 AM, Bartosz Dziewoński
<matma.rex@gmail.com> wrote:
> It is atomic on MRI. It may or may not be on other interpreters, if
> you care about them. (But probably should be as an element of the
> syntax.)

I would not bet on it being atomic, since Ruby's context-switch
boundaries are not formally defined. However, atomicity is only
important if you expect that a non-atomic assignment would produce
different results than an atomic one, which is unlikely in this case.

Of course, if it matters, you shouldn't rely on this being atomic.

- Charlie