From 3ce6d3daeeeda0fc25206ef99048467307aa0cbe Mon Sep 17 00:00:00 2001
From: Ben Darnell <ben@bendarnell.com>
Date: Mon, 11 Oct 2010 17:02:15 -0700
Subject: [PATCH] Run all IOStream callbacks inside a NullContext so that
 exception handlers are run in the right order.

---
 tornado/iostream.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tornado/iostream.py b/tornado/iostream.py
index 0a4fd8f75..ef1288b0a 100644
--- a/tornado/iostream.py
+++ b/tornado/iostream.py
@@ -177,7 +177,10 @@ class IOStream(object):
 
     def _run_callback(self, callback, *args, **kwargs):
         try:
-            callback(*args, **kwargs)
+            # Use a NullContext to ensure that all StackContexts are run
+            # inside our blanket exception handler rather than outside.
+            with stack_context.NullContext():
+                callback(*args, **kwargs)
         except:
             logging.error("Uncaught exception, closing connection.",
                           exc_info=True)
-- 
2.47.2