Re: [Qemu-devel] [RFC PATCH 0/2] port network layer onto glib

[Peter Maydell]

On 13 March 2013 12:34, Anthony Liguori <address@hidden> wrote:
> AioContext is necessary for the block layer because the block layer
> still has synchronous I/O.  I think we should aim to replace all sync
> I/O in the long term with coroutine based I/O.

I think coroutines are dreadful and we should really not be moving
towards greater use of them. They're just really really not portable
and they don't fit with the C language, and they're a constant source
of problems.(For instance I have a bug I need to look into where we
seem to hang using the gthread coroutine backend but not sigaltstack.)

Use threads, or a genuinely asynchronous API, or a select/poll loop
with callbacks, but not more coroutines please.

-- PMM