From: Ben Darnell <ben@bendarnell.com>
Date: Thu, 4 Nov 2010 18:47:34 +0000 (-0700)
Subject: Check for a closed connection in _add_io_state.
X-Git-Tag: v1.2.0~87
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2b44fac4ecf273aadc97dbcaa5abf1e3a1ee7dff;p=thirdparty%2Ftornado.git

Check for a closed connection in _add_io_state.

Closes #163.
---

diff --git a/tornado/iostream.py b/tornado/iostream.py
index 2897fdc77..4f321d557 100644
--- a/tornado/iostream.py
+++ b/tornado/iostream.py
@@ -359,6 +359,9 @@ class IOStream(object):
             raise IOError("Stream is closed")
 
     def _add_io_state(self, state):
+        if socket is None:
+            # connection has been closed, so there can be no future events
+            return
         if not self._state & state:
             self._state = self._state | state
             self.io_loop.update_handler(self.socket.fileno(), self._state)