Add debug prints for issue tango-controls#292

tango/device_proxy.py

@@ -1209,7 +1209,6 @@ def __DeviceProxy__subscribe_event_global(self, event_type, cb,
                 "an object with a 'push_event' method.")
 
         event_id = self.__subscribe_event(event_type, cbfn, stateless)
-
         with self.__get_event_map_lock():
             se = self.__get_event_map()
             evt_data = se.get(event_id)
@@ -1247,10 +1246,10 @@ def __DeviceProxy__subscribe_event_attrib(self, attr_name, event_type,
         raise TypeError(
             "Parameter cb_or_queuesize should be a number, a"
             " callable object or an object with a 'push_event' method.")
-
+    print("__DeviceProxy.subscribe_event_attrib({}): before self.__subscribe_event".format(attr_name))
     event_id = self.__subscribe_event(
         attr_name, event_type, cb, filters, stateless, extract_as)
-
+    print("__DeviceProxy.subscribe_event_attrib({}): after self.__subscribe_event; id = {}".format(attr_name, event_id))
     with self.__get_event_map_lock():
         se = self.__get_event_map()
         evt_data = se.get(event_id)
@@ -1287,7 +1286,6 @@ def __DeviceProxy__unsubscribe_event(self, event_id):
     events_del = set()
     timestamp = time.time()
     se = self.__get_event_map()
-
     with self.__get_event_map_lock():
         # first delete event callbacks that have expire
         for evt_id, (_, expire_time) in self._pending_unsubscribe.items():
@@ -1303,7 +1301,9 @@ def __DeviceProxy__unsubscribe_event(self, event_id):
             raise KeyError("This device proxy does not own this subscription " + str(event_id))
         del se[event_id]
         self._pending_unsubscribe[event_id] = evt_info[0], timestamp + _UNSUBSCRIBE_LIFETIME
+    print("__DeviceProxy__unsubscribe_event({}): before self.__unsubscribe_event".format(event_id))
     self.__unsubscribe_event(event_id)
+    print("__DeviceProxy__unsubscribe_event({}): after self.__unsubscribe_event".format(event_id))
 
 
 def __DeviceProxy__unsubscribe_event_all(self):