Added config.threadsafe! to toggle allow concurrency settings and disable the dependency loader

railties/CHANGELOG

 *Edge*
 
+* Added config.threadsafe! to toggle allow concurrency settings and disable the dependency loader [Josh Peek]
+
 * Turn cache_classes on by default [Josh Peek]
 
 * Added configurable eager load paths. Defaults to app/models, app/controllers, and app/helpers [Josh Peek]

railties/environments/production.rb

@@ -4,6 +4,9 @@
 # Code is not reloaded between requests
 config.cache_classes = true
 
+# Enable threaded mode
+# config.threadsafe!
+
 # Use a different logger for distributed setups
 # config.logger = SyslogLogger.new
 

railties/lib/initializer.rb

@@ -768,6 +768,18 @@ def set_root_path!
       ::RAILS_ROOT.replace @root_path
     end
 
+    # Enable threaded mode. Allows concurrent requests to controller actions and
+    # multiple database connections. Also disables automatic dependency loading
+    # after boot
+    def threadsafe!
+      self.cache_classes = true
+      self.dependency_loading = false
+      self.active_record.allow_concurrency = true
+      self.action_controller.allow_concurrency = true
+      self.to_prepare { Rails.cache.threadsafe! }
+      self
+    end
+
     # Loads and returns the contents of the #database_configuration_file. The
     # contents of the file are processed via ERB before being sent through
     # YAML::load.