void fd_ringbuffer_del(struct fd_ringbuffer *ring);
void fd_ringbuffer_set_parent(struct fd_ringbuffer *ring,
struct fd_ringbuffer *parent);
+will_be_deprecated
void fd_ringbuffer_reset(struct fd_ringbuffer *ring);
int fd_ringbuffer_flush(struct fd_ringbuffer *ring);
/* in_fence_fd: -1 for no in-fence, else fence fd