rails/rails — pull request #6492 by pmahoney (2012-05-25 18:45:48+00:00)
Title: Fair connection pool2

Third attempt of https://github.com/rails/rails/pull/6488

I apologize for the mess.

@rafaelfranca this is probalby more what you had in mind (I squashed all my commits, and left @yahonda's separate).

@tenderlove could you review this one?