diff --git a/eventlet/twisteds/__init__.py b/eventlet/twisteds/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/eventlet/twisteds/util.py b/eventlet/twisteds/util.py
new file mode 100644
index 0000000..1766753
--- /dev/null
+++ b/eventlet/twisteds/util.py
@@ -0,0 +1,14 @@
+from functools import wraps
+from eventlet.support.greenlet import greenlet
+from eventlet import greenlib
+from eventlet.api import get_hub
+
+def block_on(deferred):
+    cur = greenlet.getcurrent()
+    def cb(value):
+        greenlib.switch(cur, value)
+    def eb(err):
+        greenlib.switch(cur, exc=(err.type, err.value, err.tb))
+    deferred.addCallback(cb)
+    deferred.addErrback(eb)
+    return get_hub().switch()