[Libguestfs] [PATCH libnbd 1/7] api: Add semi-private function for freeing persistent data.

[Richard W.M. Jones]

On Mon, Aug 12, 2019 at 01:53:56PM -0500, Eric Blake wrote:
> We then have the design question of whether to make an OClosure type,
> where C has two functions nbd_aio_pread and nbd_aio_pread_callback for
> convenience, but where other languages have only a single nbd.aio_pread
> where the callback parameter is optional (the Closure type for
> pread_structured chunk and for block_status extent will still be
> mandatory; it is only the completion callback that is currently causing
> us twice the API because we are treating it as pseudo-optional).  Or
> maybe we just require C clients of nbd_aio_pread to always provide
> parameters for callbacks, but document that the completion callback and
> free callback pointers may be NULL.

I'll try to see what OClosure (and then getting rid of the _callback
variants, adding to the non-callback variants OClosure) will look like
tomorrow.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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