On Wed, Dec 1, 2010 at 3:33 AM, Evan Jones <ev...@mit.edu> wrote:

> The instanceof approach to switch between the two is a good idea. When I
> wrote my implementation, I was concerned about the thread-safeness issues,
> although I don't think I ever considered this particular version. However, I
> think this can be made thread-safe, even without volatile (although I only
> understand the JMM enough to be dangerous).

Well, Jeremy Manson literally wrote the book on the Java memory model, and
he says it works.  :)

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