ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index);
pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock);
if (ret < 0) {
ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index);
pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock);
if (ret < 0) {