Something

    def __updateNametags(self):
        while True:
            self.__updateNametagsEvent.clear()
            ids = [x.userId_ for x in self.__avatars]
            prefetch = self.__serviceProvider.taskScheduler.start(self.__serviceProvider.avatarInfoManager.getAvatarInfos(ids))
            
            try:
                for pyAv in self.__avatars:
                    yield self.__updateNametag(pyAv)
            except Exception, e:
                logger.exception("Failed to update nametag for avatar %r, retrying in 15 seconds", pyAv)

            self.__updatedNametagsEvent.set()

            try:
                yield WaitForEvent(self.__updateNametagsEvent, 15)
            except Timeout:
                pass