Re: [Qemu-devel] [PATCH v3 2/5] [RFC] libqblock, user example

[Wenchao Xia <xiawenc@linux.vnet.ibm.com>]

于 2012-8-30 15:46, Paolo Bonzini 写道:
> Il 30/08/2012 03:59, Wenchao Xia ha scritto:
>>>>
>>>
>>> Busy waiting is not acceptable, and this is the reason why I had
>>> suggested to keep AIO out of the design for now.
>>>
>>> You need to provide an implementation of AIO for either glib or
>>> something else, but this is best done within QEMU first (and only later
>>> moved to libqblock).
>>>
>>    It is similar to qemu's "select" type of AIO, while (true ==
>> qb_aio_check(broker) is not neccessary but an example here
>> to ensure write i/o is executed first.
>>    Do you mean qemu's aio should be improved to another type of
>> AIO API instead of select type? which kind of AIO api is preferred?
>
> Using GSource to integrate with the QEMU main loop would be an idea.
> qemu_aio_wait would remain.
>
> However, this is not relevant to libqblock.  My point is that APIs are
> hard to get right, and even harder if you try to do too many things in
> the first iteration.
>
> Paolo
>
>
  OK, I got your point, will focus on a small set of API in the first
version, then bring AIO with GSource in next step.

-- 
Best Regards

Wenchao Xia