Re: [Xen-devel] [PATCH][QEMU] Make active-timers thread-safe

[Ben Guthro <bguthro@xxxxxxxxxxxxxxx>]

After speaking with the original developer of this patch, it may have 
been a mistake to port it forward from the 3.1 codebase.
This submission was premature.
We will do some investigation to see if this is still a problem in unstable.

Apologies,
Ben

Daniel P. Berrange wrote:
> On Mon, Aug 27, 2007 at 02:58:26PM -0400, Ben Guthro wrote:
>   
> > Protect active_timers[] lists with mutexes so timers can be safely used 
> > from different threads.
> >     
> What code in QEMU is actually still using threads ? There used to be a Xen
> specific patch to the IDE layer to perform DMA ops in threads, but that was
> removed when xen-unstable synced with QEMU 0.9.0. Not aware of anything
> else using threads in the QEMU device model - its pretty dangerous because
> QEMU's internal data structures basically all assume single-threaded access.
>
> Regards,
> Dan.
>   

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