[Libguestfs] [PATCH libnbd 6/6] lib: Make all completion callbacks into OClosures.

[Eric Blake]

On 8/13/19 5:06 AM, Richard W.M. Jones wrote:
> This doesn't change the C API, except that it is now permitted to pass
> NULL, NULL for the completion callback.  For the Python and OCaml
> APIs the parameter changes to be an optional parameter.

As mentioned elsewhere in this series, we probably want to move
nbd_set_debug_callback to take an OClosure as well, to preserve
pre-series behavior of allowing a NULL fn to revert back to the default
debug handler.


> @@ -1874,9 +1873,8 @@ documented in C<nbd_pread_structured>.";
>    "aio_pread_structured_callback", {
>      default_call with
>      args = [ BytesPersistOut ("buf", "count"); UInt64 "offset";
> -             Closure chunk_closure;
> -             Closure completion_closure ];
> -    optargs = [ OFlags ("flags", cmd_flags) ];
> +             Closure chunk_closure ];
> +    optargs = [ OClosure completion_closure; OFlags ("flags", cmd_flags) ];

If we are too bothered by the inconsistency mentioned in patch 1 (in
that all closure names are fixed globally), we would rewrite this to

optargs = [ OClosure ("completion", completion_closure);
            OFlags ("flags", cmd_flags) ];

but I'm fine with what you have.

ACK.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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