'Unregister all registered services.'

def unregisterAllServices(self):

    if (not self.services):
        return
    now = currentTimeMillis()
    nextTime = now
    i = 0
    while (i < 3):
        if (now < nextTime):
            self.wait((nextTime - now))
            now = currentTimeMillis()
            continue
        out = DNSOutgoing((_FLAGS_QR_RESPONSE | _FLAGS_AA))
        for info in self.services.values():
            out.addAnswerAtTime(DNSPointer(info.type, _TYPE_PTR, _CLASS_IN, 0, info.name), 0)
            out.addAnswerAtTime(DNSService(info.name, _TYPE_SRV, _CLASS_IN, 0, info.priority, info.weight, info.port, info.server), 0)
            out.addAnswerAtTime(DNSText(info.name, _TYPE_TXT, _CLASS_IN, 0, info.text), 0)
            if info.address:
                out.addAnswerAtTime(DNSAddress(info.server, info.ip_type, _CLASS_IN, 0, info.address), 0)
        self.send(out)
        i += 1
        nextTime += _UNREGISTER_TIME
