[TUHS] CMU Mach sources?

[Ben Greenfield]

> On Jun 27, 2019, at 6:59 AM, arnold at skeeve.com wrote:
> 
> Larry McVoy writes:
>>>> OK, I'll bite.  Go read the source in the FreeBSD tree, which has been 
>>>> reduced in size by 60% according to someone on the team.  Then come
>>>> back and draw me a picture of what it does.
> 
> On Jun 27, 2019, at 12:01 AM, Lyndon Nerenberg <lyndon at orthanc.ca> wrote:
>>> Larry, it seems to me your argument is the Mach code should never
>>> have been incorporated into BSD in the first place.  That's fine,
>>> but it's not the Mach developers fault that happened, so maybe you
>>> should lay off them for not writing their research software to a
>>> production shop standard they were never a part of?
> 
> Ben Greenfield via TUHS <tuhs at minnie.tuhs.org> wrote:
>> My understanding is that the  BSD layer was a requirement from DARPA.
>> DARPA wanted a “normal” interface to the kernel and BSD was that interface.
> 
> Yes, Mach had to provide a BSD layer on top, but that's not the source
> of Larry's gripes.
> 
> It's the other way around. 4.4 BSD pulled the VM code out of Mach and
> into BSD to provide mmap and some level of portability off the Vax. From
> there the Mach code got into FreeBSD.  That's what Larry is complaining
> about and what Lyndon is saying isn't fair to the Mach guys.

Thank you for this clarification, so this conversation has been going on since the 80’s and gets ignited from time to time.

Thank you,

Ben


> 
> Thanks,
> 
> Arnold