[TUHS] A/UX [was Linux is on-topic]

[Larry McVoy]

On Tue, Jul 21, 2020 at 10:40:21PM -0700, Bakul Shah wrote:
> On Jul 21, 2020, at 8:13 PM, tytso at mit.edu wrote:
> > 
> > The issue is that there aren't that many good real-time programmers
> > Tavailable.  Furthermore, many real-time applications need to do a lot
> > more than data acquisition, so having access to POSIX API's in the
> > real time task is very attractive.  Sure, you can try to interchange
> > information between the real-time task and the POSIX task, but that's
> > a lot more complicated, and that's where the "not enough real-time
> > programmers" rears its head again.
> > 
> > ...
> > Sure, there will be some number of real-time task which needs
> > single-digit millisecond real-time guarantees --- in which case you
> > can write it in C using Real-time Linux.  And for those really cases
> > where you need latencies which are in the tens of microsecnds; then
> > yeah, at that point you might need specialized OS's.  But the cases
> > where you need fast, hard real-time is pretty rare compared to those
> > cases where real-time Java is sufficient.
> 
> 
> The approach taken by Massalin in their Synthesis Kernel seemed quite
> promising. 

One of the few CS PhD thesis worth reading.

http://www.scs.stanford.edu/nyu/04fa/sched/readings/synthesis.pdf