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

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

于 2012-8-29 19:11, Paolo Bonzini 写道:
> Il 29/08/2012 13:05, Wenchao Xia ha scritto:
>> +    printf("checking aio status for %d times.\n", check_times);
>> +    while (true == qb_aio_check(broker)) {
>> +        check_times++;
>> +        usleep(1);
>> +    }
>> +
>
> 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?

> Paolo
>


-- 
Best Regards

Wenchao Xia