Re: [Qemu-devel] [RFC PATCH V7 07/19] protect TBContext with tb_lock.

[Peter Maydell]

On 11 August 2015 at 09:34, Paolo Bonzini <address@hidden> wrote:
>
>
> On 11/08/2015 08:46, Frederic Konrad wrote:
>>> I think you should start easy and reuse the existing tb_lock code in
>>> cpu-exec.c:
>>
>> I think it's definitely not sufficient. Is user-mode multithread still
>> working today?
>
> For some definition of "working", yes.  It's not sufficient, but it's a
> good start.
>
> The main problem with user-mode multithreading is that there is no clear
> lock hierarchy between mmap_lock and tb_lock.  But this is not a problem
> for softmmu.

And also that we don't have a serious design for the locking at all.
I was hoping this would be something that would come out of the
multithreaded-TCG work...

-- PMM