Drop ActionController::Base.allow_concurrency flag

actionpack/CHANGELOG

 *Edge*
 
+* Drop ActionController::Base.allow_concurrency flag [Josh Peek]
+
 * More efficient concat and capture helpers. Remove ActionView::Base.erb_variable.  [Jeremy Kemper]
 
 * Added page.reload functionality. Resolves #277. [Sean Huber]

actionpack/lib/action_controller/base.rb

@@ -283,13 +283,6 @@ class Base
     @@debug_routes = true
     cattr_accessor :debug_routes
 
-    # Indicates to Mongrel or Webrick whether to allow concurrent action
-    # processing. Your controller actions and any other code they call must
-    # also behave well when called from concurrent threads. Turned off by
-    # default.
-    @@allow_concurrency = false
-    cattr_accessor :allow_concurrency
-
     # Modern REST web services often need to submit complex data to the web application.
     # The <tt>@@param_parsers</tt> hash lets you register handlers which will process the HTTP body and add parameters to the
     # <tt>params</tt> hash. These handlers are invoked for POST and PUT requests.

railties/lib/webrick_server.rb

@@ -43,8 +43,6 @@ def initialize(type = "query", table = nil, stdin = nil)
 # can change this behavior by setting ActionController::Base.allow_concurrency
 # to true.
 class DispatchServlet < WEBrick::HTTPServlet::AbstractServlet
-  REQUEST_MUTEX = Mutex.new
-
   # Start the WEBrick server with the given options, mounting the
   # DispatchServlet at <tt>/</tt>.
   def self.dispatch(options = {})
@@ -73,15 +71,8 @@ def initialize(server, options) #:nodoc:
 
   def service(req, res) #:nodoc:
     unless handle_file(req, res)
-      begin
-        REQUEST_MUTEX.lock unless ActionController::Base.allow_concurrency
-        unless handle_dispatch(req, res)
-          raise WEBrick::HTTPStatus::NotFound, "`#{req.path}' not found."
-        end
-      ensure
-        unless ActionController::Base.allow_concurrency
-          REQUEST_MUTEX.unlock if REQUEST_MUTEX.locked?
-        end
+      unless handle_dispatch(req, res)
+        raise WEBrick::HTTPStatus::NotFound, "`#{req.path}' not found."
       end
     end
   end