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Re: [Xen-devel] [PATCH] tools/ocaml: Build fix following libxl API changes
- To: Anthony PERARD <anthony.perard@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 20 Sep 2019 18:50:37 +0100
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- Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Christian Lindig <christian.lindig@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, David Scott <dave@xxxxxxxxxx>
- Delivery-date: Fri, 20 Sep 2019 17:50:50 +0000
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On 20/09/2019 17:19, Anthony PERARD wrote:
> The following libxl API became asynchronous and gained an additional
> `ao_how' parameter:
> libxl_domain_pause()
> libxl_domain_unpause()
> libxl_send_trigger()
>
> Adapt the ocaml binding.
>
> Build tested only.
>
> Fixes: edaa631ddcee665cdfae1cf6bc7492c791e01ef4
> Fixes: 95627b87c3159928458ee586e8c5c593bdd248d8
> Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
This library is entirely unused, full of memory leaks, and has a number
of areas needing extremely careful design due to the differing
behaviours of the libxl and ocaml runtimes.
Another option would be to drop the bindings entirely.
> ---
>
> Notes:
> Currently, all libxl API that takes an `ao_how` have `?async:'a -> unit`
> in the ocaml definition (and an extra unused value unit in the c stub
> file), is that `unit` needed ?
>
> I tried to add it, but then for stub_xl_send_trigger() I had to use
> CAMLparam6, and that doesn't exist.
In the Ocaml FFI, with more than 5 parameters, the entire set of
parameters is spilled to memory as an array, so the C side of the
function ends with a CAMLparam2 (list pointer and number of entries),
and has extra marshalling to do.
~Andrew
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