Rails thread unsafety (active record specifically) was the last block on making multi-threaded apps. JRuby, Mongrel, were multithreaded before that. Mongrel has

Rails thread unsafety (active record specifically) was the last block on making multi-threaded apps. JRuby, Mongrel, were multithreaded before that. Mongrel has semaphore around main rails call. I assume once you remove it with Rails 2.2 and jRuby it should be multi-threaded. What am I missing?