Dereference the current YieldPoint as soon as it resolves.

These references could otherwise keep a chain of old references alive
(test code: https://groups.google.com/group/python-tornado/browse_thread/thread/37d3928817e4924d)

diff --git a/tornado/gen.py b/tornado/gen.py
index 885b604d33102d32bd409192b23daa5b1250ce8d..c2b8958751d7a5b84ce5406c6b5dffcf283f8db6 100644 (file)
--- a/tornado/gen.py
+++ b/tornado/gen.py
@@ -498,6 +498,7 @@ class Runner(object):
                         if not self.yield_point.is_ready():
                             return
                         next = self.yield_point.get_result()
+                        self.yield_point = None
                     except Exception:
                         self.exc_info = sys.exc_info()
                 try: