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Re: [Qemu-devel] [PATCH 1.1] coroutine: Avoid ucontext usage on i386 Lin

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH 1.1] coroutine: Avoid ucontext usage on i386 Linux host
Date: Wed, 9 May 2012 22:27:59 +0100

On 9 May 2012 21:59, Anthony Liguori <address@hidden> wrote:
> On 05/09/2012 03:46 PM, Peter Maydell wrote:
>> Longer term (ie post 1.1) I'm strongly in favour of kicking
>> out coroutines, because I think there clearly is no single
>> solid portable implementation possible. C just isn't designed
>> to allow them; better not to try to swim against the current.

> Unfortunately, voting for code to be different doesn't actually make it
> different.

Yeah, I agree with this sentiment...

> If you're volunteering to rewrite the block layer to not require coroutines
> (either by using a state machine or by using re-entrant threads and fixing
> any locking issues associated with that) that's wonderful.
> But we decided to not do synchronous I/O years ago and still haven't removed
> it all from the tree.  Coroutines got us much closer to getting rid of
> synchronous I/O.

...but I would at least like us to take the position that we don't
introduce *more* users of coroutines.

-- PMM

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