rails/rails — pull request #6405 by pinetops (2012-05-20 14:47:28+00:00)
Title: Fix template compilation concurrency issue, and template caching concurrency

This rolls in josevalim's request for a comment for the fix for #6400.

Also two new commits fixing another concurrency issue #6404. First a simplistic implementation, then a more optimal one - but that probably needs further discussion.