Re: [Qemu-devel] Do we need CONFIG_AIO?

[Avi Kivity]

Todd T. Fries wrote:
> Penned by Stefano Stabellini on 20090525 12:49.08, we have:
> | Christoph Hellwig wrote:
> | 
> | > Currently all aio code in the raw-posix block driver depends on a
> | > CONFIG_AIO symbol that gets set based on the availability of the
> | > pthreads library.  Beeing able to rely on unconditional aio support
> | > means we could remove the whole code for plain bdrv_read/bdrv_write
> | > in raw-posix.c which is about 300 lines of code and a duplicated code
> | > path.  Is there any Posix-ish platform qemu supports that does not
> | > have pthreads support?
> | > 
> | 
> | MiniOS.
> | I would appreciate if you keep that flag.
>
> You seem to be under the illusion that pthreads implies AIO.
>   

He isn't.

> OpenBSD has two flavors of threads libraries (arguably one is not
> fit for consumption yet) and neither provide AIO.
>
> This flag is most useful for OpenBSD as well.
>   

Qemu's CONFIG_AIO requires thread support from the host, not posix aio 
support.

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