OS9, hard or soft RTOS?

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OS9, hard or soft RTOS?
6 answers - 155 bytes -
Is S9 considered a 'hard' or 'soft' RTS, I think 'hard' but would like
confirmation.
Cheers,
Iain
No.1 | | 603 bytes | |
Iain Mackenzie <imk@dial.pipex.comwrote:
Is S9 considered a 'hard' or 'soft' RTS, I think 'hard' but would like
confirmation.
Cheers,
Iain

Soft, I'm afraid. All the Unixy stuff in there, and the dynamic
reconfiguration, means that it'd be virtually impossible to make hard
timing guarantees. Microware (or Radisys now) don't describe it as
a hard RTS themselves

It's rather a nice system, but it's in the sort of VxWorks/QNX/CE sector
of the market rather than deeply embedded hard realtime Ses.

pete
No.2 | | 1122 bytes | |
"Iain Mackenzie" <imk@dial.pipex.comwrote in news:cufit9$g7a$1
@internet.csl.co.uk:

Is S9 considered a 'hard' or 'soft' RTS, I think 'hard' but would like
confirmation.
Cheers,
Iain
--
Depends on what you are trying to do. If you use the features that use
dynamic loading and allocations then it will be soft. If you have all
software loaded and setup and the configuration does not change then it
will hang in there with the "hard" RTS's. S9 is extremely fexible and
can be configured as a multi-user S that dynamicly loads and starts
process with round robin time sharing, this will be a soft configuration.
You can also configure the S9 the where all of the processes startup at
boot time, nothing is dynamicly loading or starting, The scheduling is
priority based, and it will be a very deterministic RTS that will hang in
there with the highly embedded kernels. Even stripped down it will be
larger than the very highly embedded kernels, but you have a lot more
functionality.

Allan R. Batteiger
No.3 | | 900 bytes | |
Thanks Pete, but ooops, as a user I know that VxWorks is hard Real Time and
is definitely not in the same market sector as QNX & CE

Iain

"Pete Fenelon" <pete@stratos.fenelon.comwrote in message
news:crmfuc.7ju.ln@fenelon.com
Iain Mackenzie <imk@dial.pipex.comwrote:
>Is S9 considered a 'hard' or 'soft' RTS, I think 'hard' but would like
>confirmation.
>Cheers,
>Iain
>
Soft, I'm afraid. All the Unixy stuff in there, and the dynamic
reconfiguration, means that it'd be virtually impossible to make hard
timing guarantees. Microware (or Radisys now) don't describe it as
a hard RTS themselves

It's rather a nice system, but it's in the sort of VxWorks/QNX/CE sector
of the market rather than deeply embedded hard realtime Ses.

pete
No.4 | | 376 bytes | |
Iain Mackenzie <imk@dial.pipex.comwrote:
Thanks Pete, but ooops, as a user I know that VxWorks is hard Real Time and
is definitely not in the same market sector as QNX & CE

Depends on how hard you think hard is. For automotive powertrain
applications, which most of our customers are concerned with, VxWorks
just doesn't cut the mustard.

pete
No.5 | | 310 bytes | |
Pete Fenelon wrote:

Depends on how hard you think hard is. For automotive powertrain
applications, which most of our customers are concerned with, VxWorks
just doesn't cut the mustard.

So which hard RTS are used in the automotive industry Pete?

Regards,
Volkan
No.6 | | 631 bytes | |
Volkan Arslan <Volkan_Arslan@gmx.netwrote:
Pete Fenelon wrote:
>
>Depends on how hard you think hard is. For automotive powertrain
>applications, which most of our customers are concerned with, VxWorks
>just doesn't cut the mustard.
>
So which hard RTS are used in the automotive industry Pete?

Mostly various implementations of SEK, an S standard created by/for
the automotive industry. There are higher-end systems in "infotainment",
but most automotive stuff tends to either use SEK, no S at all, or
custom-built cyclic solutions.

pete

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