1 files changed, 25 insertions, 0 deletions
diff --git a/actionpack/lib/action_view/body_parts/concurrent_block.rb b/actionpack/lib/action_view/body_parts/concurrent_block.rb
new file mode 100644
index 0000000000..28a3a3bf4d
--- /dev/null
+++ b/actionpack/lib/action_view/body_parts/concurrent_block.rb
@@ -0,0 +1,25 @@
+module ActionView
+  module BodyParts
+    class ConcurrentBlock
+      def initialize(&block)
+        @block = block
+        @body = []
+        start
+      end
+
+      def to_s
+        finish
+        @body.join
+      end
+
+      protected
+        def start
+          @worker = Thread.new { @block.call(@body) }
+        end
+
+        def finish
+          @worker.join if @worker && @worker.alive?
+        end
+    end
+  end
+end