Olaf Hering writes ("wating for backend changes (was Re: [PATCH v3 4/4] libxl:
add support for vscsi)"):
> How is new code supposed to wait for backend changes?
>
> Right now there are two APIs for that:
> - libxl__wait_for_backend loops for a while until it returns an error.
This is deprecated. I seem to remember I wrote a patch to clarify the
internal docs but it seems to be languishing in one of my outstanding
series.
> - libxl__ev_devstate_wait registers a watch and a timer.
New code should use this.
> In case of pvscsi there are three variants:
> - new, can use libxl__wait_device_connection
> - reconfigure, can use both of the above
> - remove, may use DEFINE_DEVICE_REMOVE and its
> libxl__initiate_device_remove
...
> The pci code in libxl uses just libxl__wait_for_backend. Looking through
> the history it seems the function was added just for pci. Is it a
> deprecated function, should callers get converted to
> libxl__ev_devstate_wait?
Ideally, yes.
Thanks,
Ian.
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