Reorganize ActionController folder structure

1 files changed, 16 insertions, 0 deletions

diff --git a/actionpack/lib/action_controller/dispatch/rack/lock.rb b/actionpack/lib/action_controller/dispatch/rack/lock.rb
new file mode 100644
index 0000000000..c50762216e
--- /dev/null
+++ b/actionpack/lib/action_controller/dispatch/rack/lock.rb
@@ -0,0 +1,16 @@
+module ActionController
+  class Lock
+    FLAG = 'rack.multithread'.freeze
+
+    def initialize(app, lock = Mutex.new)
+      @app, @lock = app, lock
+    end
+
+    def call(env)
+      old, env[FLAG] = env[FLAG], false
+      @lock.synchronize { @app.call(env) }
+    ensure
+      env[FLAG] = old
+    end
+  end
+end