Move gaint lock into middleware

1 files changed, 18 insertions, 0 deletions

diff --git a/actionpack/lib/action_controller/lock.rb b/actionpack/lib/action_controller/lock.rb
new file mode 100644
index 0000000000..b4b0902f18
--- /dev/null
+++ b/actionpack/lib/action_controller/lock.rb
@@ -0,0 +1,18 @@
+module ActionController
+  class Lock
+    def initialize(app)
+      @app = app
+      @lock = Mutex.new
+    end
+
+    def call(env)
+      old_multithread = env["rack.multithread"]
+      env["rack.multithread"] = false
+      response = @lock.synchronize do
+        @app.call(env)
+      end
+      env["rack.multithread"] = old_multithread
+      response
+    end
+  end
+end