591         with self._cnxset_tracker:

   591         with self._cnxset_tracker:

   592             old_cnxset = self._cnxset

   592             old_cnxset = self._cnxset

   593             if new_cnxset is old_cnxset:

   593             if new_cnxset is old_cnxset:

   594                 return #nothing to do

   594                 return #nothing to do

   595             if old_cnxset is not None:

   595             if old_cnxset is not None:

   596                 self._cnxset = None

   597                 self._cnxset = None

   597                 self.ctx_count -= 1

   598                 self.ctx_count -= 1

   598                 self._cnxset_tracker.forget(self.connectionid, old_cnxset)

   599                 self._cnxset_tracker.forget(self.connectionid, old_cnxset)

   599             if new_cnxset is not None:

   600             if new_cnxset is not None:

   600                 self._cnxset_tracker.record(self.connectionid, new_cnxset)

   601                 self._cnxset_tracker.record(self.connectionid, new_cnxset)