From: Adam Sanderson <netghost@...>
Date: 2006-01-10T08:08:01+09:00
Subject: Re: Futures in Ruby

Interesting, I wasn't aware of that difference.  My assumption was that
asynchs in Io were just asynchronous calls that required no result
which is quite likely wrong.  I mostly went off of things I've gleaned
from the Java Concurrency package:
http://java.sun.com/j2se/1.5.0/docs/api/java/util/concurrent/package-summary.html

Your implementation appears to be more like mental's Promises
http://www.ruby-forum.com/topic/48121

They're all subtly different, handy constructs :)
  .adam