In general, the guarantee is that B will do exactly as you say.... it will
read the new value or the old value.  Your question depends on a definition
of "now" that spans several machines.  That is a dangerous concept and if
your reasoning requires it, you are headed for trouble.

On Thu, Apr 29, 2010 at 2:58 AM, Chen Bangzhong <bangzh...@gmail.com> wrote:

> , what value will B read? new
> value or older value?
>

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