Re: [PATCH v3 06/33] util/async: aio_co_schedule(): support reschedule in same ctx

[Paolo Bonzini]

On 16/04/21 10:08, Vladimir Sementsov-Ogievskiy wrote:
> With the following patch we want to call wake coroutine from thread.
> And it doesn't work with aio_co_wake:
> Assume we have no iothreads.
> Assume we have a coroutine A, which waits in the yield point for
> external aio_co_wake(), and no progress can be done until it happen.
> Main thread is in blocking aio_poll() (for example, in blk_read()).
>
> Now, in a separate thread we do aio_co_wake(). It calls  aio_co_enter(),
> which goes through last "else" branch and do aio_context_acquire(ctx).

I don't understand.  Why doesn't aio_co_enter go through the ctx != 
qemu_get_current_aio_context() branch and just do aio_co_schedule?  That 
was at least the idea behind aio_co_wake and aio_co_enter.

Paolo