timeout could be None.

examples/djangotest/settings.py

@@ -1,5 +1,8 @@
 # Django settings for djangotest project.
 
+import platform
+PRODUCTION_MODE = platform.node().startswith('http')
+
 DEBUG = True
 TEMPLATE_DEBUG = DEBUG
 

gunicorn/util.py

@@ -80,7 +80,7 @@ def write(sock, data):
         
 def write_nonblock(sock, data):
     timeout = sock.gettimeout()
-    if sock.gettimeout() > 0.0:
+    if timeout != 0.0:
         try:
             sock.setblocking(0)
             return write(sock, data)