Re: [hatari-devel] Falcon Sound

[Eero Tamminen <oak@xxxxxxxxxxxxxx>]

Hi,

On 10/13/2016 12:56 AM, Miro Kropáček wrote:
> On 13 October 2016 at 07:17, Eero Tamminen <oak@xxxxxxxxxxxxxx> wrote:
>
> > Adding threading and locking on top of that, to be able to run few DSP
> > instructions at a time on separate core wouldn't help much and could
> > even slow down things.
>
> I'm not so sure about this. You could have something like a:
>
> <execute instruction>
> <wait until the tick reaches the original clock cycle time>
> <execute instruction> ...
>
> so you wouldn't synchronise to the CPU but to a time interval. So the CPU,
> DSP, Videl, SDMA ... could have all have a sense of time instead of
> interdependencies to each other.

You cannot rely just on host timing.  Processes & threads get
context switched at arbitrary points, so you will need also
locking.

Current OSes locking mechanisms spin CPU for a while in case lock
gets immediately released, and in a Falcon CPU<->DSP emulation which
would need to do that constantly, well...


	- Eero