def unregister(self, thread):
        """
        Unregisters an existing thread, so that this thread is no longer available.

        This function is mainly used during plugin deactivation.

        :param thread: Name of the thread
        """
        if thread not in self.threads.keys():
            self.log.warning("Can not unregister thread %s" % thread)
        else:
            del (self.threads[thread])
            self.__log.debug("Thread %s got unregistered" % thread)