From: homm <homm86@gmail.com>
Date: Sun, 28 Apr 2013 19:25:28 +0000 (+0400)
Subject: Avoid circular references in StackContext and ExceptionStackContext.
X-Git-Tag: v3.1.0~95^2~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d1cc3c99e4e8d1bdb936dbbcc6cb963d6bef2e1e;p=thirdparty%2Ftornado.git

Avoid circular references in StackContext and ExceptionStackContext.
---

diff --git a/tornado/stack_context.py b/tornado/stack_context.py
index 8804d42d8..ec94a1b8e 100644
--- a/tornado/stack_context.py
+++ b/tornado/stack_context.py
@@ -151,6 +151,9 @@ class StackContext(object):
                     'stack_context inconsistency (may be caused by yield '
                     'within a "with StackContext" block)')
 
+            # Break up a reference to itself to allow for faster GC on CPython.
+            self.new_contexts = None
+
 
 class ExceptionStackContext(object):
     """Specialization of StackContext for exception handling.
@@ -190,6 +193,9 @@ class ExceptionStackContext(object):
                     'stack_context inconsistency (may be caused by yield '
                     'within a "with StackContext" block)')
 
+            # Break up a reference to itself to allow for faster GC on CPython.
+            self.new_contexts = None
+
 
 class NullContext(object):
     """Resets the `StackContext`.