From: Alexander <homm86@gmail.com>
Date: Thu, 26 Jan 2017 21:28:03 +0000 (+0300)
Subject: release exc_info even when exception is thrown
X-Git-Tag: v4.5.0~15^2~3
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=aa5c6d9fdc0dc94c5710ea23dfae77f99464cfb0;p=thirdparty%2Ftornado.git

release exc_info even when exception is thrown
remove extra references to the futures
---

diff --git a/tornado/gen.py b/tornado/gen.py
index b308ca7d0..60eecdb9d 100644
--- a/tornado/gen.py
+++ b/tornado/gen.py
@@ -960,6 +960,7 @@ class Runner(object):
         # of the coroutine.
         self.stack_context_deactivate = None
         if self.handle_yield(first_yielded):
+            gen = result_future = first_yielded = None
             self.run()
 
     def register_callback(self, key):
@@ -1018,8 +1019,10 @@ class Runner(object):
                         exc_info = sys.exc_info()
 
                     if exc_info is not None:
-                        yielded = self.gen.throw(*exc_info)
-                        exc_info = None
+                        try:
+                            yielded = self.gen.throw(*exc_info)
+                        finally:
+                            exc_info = None
                     else:
                         yielded = self.gen.send(value)