Add the possibility in epoll to disable timeout in a python's select compatible way.

git-svn-id: https://svn.erp5.org/repos/neo/branches/prototype3@275 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/epoll.py

@@ -75,8 +75,11 @@ class Epoll(object):
         self.events = epoll_event_array()
 
     def poll(self, timeout = 1):
-        timeout *= 1000
-        timeout = int(timeout)
+        if timeout is None:
+            timeout = -1
+        else:
+            timeout *= 1000
+            timeout = int(timeout)
         while 1:
             n = epoll_wait(self.efd, byref(self.events), self.maxevents, 
                            timeout)