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Many people have been using Thread.critical for locking because Ruby
1.8's Mutex is relatively slow.  Since 1.9 will not have
Thread.critical, I think it would be good to optimize Mutex in 1.8 so
people can become accustomed to using it today.

Is someone already working on a faster Mutex for 1.8?  If not, I'd be
interested in doing so.

-mental

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