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Re: When exactly do you choose to use a RTOS (instead of a non-OS approach)?

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On 05/01/18 19:51, Paul Rubin wrote:
> StateMachineCOM <statemachineguru@gmail.com> writes:
>> Neither are the various ad hoc tweaks to the venerable "superloop". To
>> find out about the alternatives, I would recommend to google for the
>> phrase "beyond the RTOS".
>
> I looked at https://www.embeddedrelated.com/showarticle/951.php and the
> linked slideshare presentation.  I'm not that much of an OOP guy so I
> may have missed some of the jargon.  But it looks like you're advocating
> a traditional message-passing approach to concurrency, with some scheme
> for wrapping a separate event loop for each task.  You might like the
> Erlang OTP system which does something like that, with preemptive
> scheduling and no shared data between tasks.  It may be inadequate for
> low latency hard-real-time systems but works very well when there's a
> little bit more timing slack available (millisecond-level soft RT).

Or, with careful thought and decades of experience,
you can implement the RTOS in hardware.

See the multicore XMOS xCORE processors with xC
(a modern CSP/Occam), for embedded hard realtime
programs. "Hard" means the IDE/toolchain calculates
the min/max instruction times.

Processors with up to 32 cores and 4000MIPS, and
interrupt latencies of 10ns.

There is tightly integrated hardware plus software
support for i/o event processing and inter-core comms.
With that you don't need an RTOS :)

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Re: When exactly do you choose to use a RTOS (instead of a non-OS approach)? StateMachineCOM <statemachineguru@gmail.com> - 2018-01-05 09:47 -0800
  Re: When exactly do you choose to use a RTOS (instead of a non-OS approach)? Paul Rubin <no.email@nospam.invalid> - 2018-01-05 11:51 -0800
    Re: When exactly do you choose to use a RTOS (instead of a non-OS approach)? StateMachineCOM <statemachineguru@gmail.com> - 2018-01-05 15:30 -0800
      Re: When exactly do you choose to use a RTOS (instead of a non-OS approach)? Paul Rubin <no.email@nospam.invalid> - 2018-01-05 16:34 -0800
        Re: When exactly do you choose to use a RTOS (instead of a non-OS approach)? Les Cargill <lcargill99@comcast.com> - 2018-01-05 21:34 -0600
          Re: When exactly do you choose to use a RTOS (instead of a non-OS approach)? Paul Rubin <no.email@nospam.invalid> - 2018-01-05 19:52 -0800
            Re: When exactly do you choose to use a RTOS (instead of a non-OS approach)? Les Cargill <lcargill99@comcast.com> - 2018-01-06 16:42 -0600
              Re: When exactly do you choose to use a RTOS (instead of a non-OS approach)? Paul Rubin <no.email@nospam.invalid> - 2018-01-08 13:45 -0800
    Re: When exactly do you choose to use a RTOS (instead of a non-OS approach)? Tom Gardner <spamjunk@blueyonder.co.uk> - 2018-01-05 23:51 +0000
      Re: When exactly do you choose to use a RTOS (instead of a non-OS approach)? Paul Rubin <no.email@nospam.invalid> - 2018-01-05 16:35 -0800
        Re: When exactly do you choose to use a RTOS (instead of a non-OS approach)? Tom Gardner <spamjunk@blueyonder.co.uk> - 2018-01-06 09:45 +0000
          Re: When exactly do you choose to use a RTOS (instead of a non-OS approach)? upsidedown@downunder.com - 2018-01-06 12:32 +0200
            Re: When exactly do you choose to use a RTOS (instead of a non-OS approach)? Tom Gardner <spamjunk@blueyonder.co.uk> - 2018-01-06 11:16 +0000
              Re: When exactly do you choose to use a RTOS (instead of a non-OS approach)? upsidedown@downunder.com - 2018-01-07 13:35 +0200
                Re: When exactly do you choose to use a RTOS (instead of a non-OS approach)? Tom Gardner <spamjunk@blueyonder.co.uk> - 2018-01-07 13:55 +0000
            Re: When exactly do you choose to use a RTOS (instead of a non-OS approach)? Les Cargill <lcargill99@comcast.com> - 2018-01-06 16:49 -0600
              Re: When exactly do you choose to use a RTOS (instead of a non-OS approach)? Tom Gardner <spamjunk@blueyonder.co.uk> - 2018-01-07 01:39 +0000

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