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Re: [Qemu-devel] [RFC] block: Removed coroutine ownership assumption

From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] [RFC] block: Removed coroutine ownership assumption
Date: Wed, 27 Jun 2012 09:11:20 +0100

On Wed, Jun 27, 2012 at 8:59 AM, Peter Maydell <address@hidden> wrote:
> On 27 June 2012 08:48, Stefan Hajnoczi <address@hidden> wrote:
>> I'd like to see your code though because I still don't understand why
>> it relies on the exact yield behavior.  Have you pushed it to a public
>> git repo?
> I haven't seen Peter's code either, but his complaint makes sense
> to me -- the whole point of coroutines is that you can rely on
> the exact yield behaviour, surely.

Not if you call coroutine_fn functions - these are explicitly marked
as functions that yield.  For example block or net I/O.

The issue here is that there are some block.h functions that are not
marked coroutine_fn but actually yield if running inside coroutine
context.  I think we could get rid of them with a little bit of work.


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