def empty(self):
        maxsize, nextsize, message_count, timeout = wrapped(win32file.GetMailslotInfo, self._read_handle())
        return message_count == 0
Validates that the value is a valid foreign key
dataset/ETHPy150Open tjguk/winsys/winsys/ipc.py/Mailslot.empty--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-0.96/django/db/models/fields/related.py/manipulator_valid_rel_key