From: MenTaLguY <mental@...>
Date: 2006-02-22T09:34:24+09:00
Subject: Re: [ANN] lazy.rb 0.9.5 -- transparent futures!

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On Wed, 2006-02-22 at 09:07 +0900, Daniel Nugent wrote:
> What's the purpouse of the spinlock in __synchronize__?

> To keep a Future's block from evaluating several times in parallel?

s/Future/Promise/, and you've got it.

It ensures that each promise only ever gets evaluated once, even when
multiple threads demand its result at the same time.

Nothing to do with futures in particular; I only require threadsafe for
futures because using futures guarantees that your program will have
multiple threads.

-mental

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