On Thu, Sep 07, 2000 at 02:23:55PM +0200, Paolo Mantegazza wrote:
> > There is no such thing as a dynamic real time memory manager.
>
> In fact I was just betting there will be one in the future :-).
When we get infinite memory, sure.
> In fact we (I, Steve and Pierre) discussed a similar solution before
> they implemented theirs ideas, but they denied its usefulness because
> was too much not deterministic, and they needed a truly fast minimal
> latency dynamic memory manager for their applications.
The solution of having a cache on the RT side does not make the system
deterministic. What may become deterministic is that a yes/no result is
in bounded time. But what remains is that the thread depending on this
system is now non-deterministic in operation.
This is not necessarily terrible, note that rtfifos to user processes
force a more limited type of nondeterminism -- but this is in a context where
a deterministic RT thread connects to a non-deterministc process.
> Note also that RTAI calls what you name soft interrupts as system
I didn't make up the name "soft interrupts".
--
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Victor Yodaiken
Finite State Machine Labs: The RTLinux Company.
www.fsmlabs.com www.rtlinux.com
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