Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.arch.embedded > #28475

Re: How to avoid a task not executed in a real-time OS?

Show all headers | View raw

Am 21.01.2019 um 13:40 schrieb Robert Willy:

> A watch-dog can avoid a task not called in a real-time system.

No, it really can't.  It can only _react_ to a supervised task not
having been called in time.  But it cannot keep that from happening in
the first place, i.e. it cannot "avoid" it.  Nor can it usually
guarantee that a bite of the dog will actually resolve the issue.

> But in a RTOS, what is the right answer for it?

Quite probably the same, because there is not really a difference
between "real-time system" and "RTOS".

Any sufficiently badly designed application can fail to perform some
task before its allotted deadline.  If that renders the performance of
said application unacceptable, that means the buzz-word "real-time" has
been applied to it correctly --- quite often it isn't.

Nor is there such a thing as "the" right answer to the question "what
should I do if this happened to me?"  Like for all somewhat interesting
questions, the only universally applicable answer is "It depends."

In a perfect world the answer might be "Just make sure your system has
sufficient resources in all areas that this simply cannot happen, and
then some" --- but in most corners of this here reality bean-counters
will tell you, in excruciating detail if you insist, why that answer is
completely not incorrect, but actually blasphemous.

Back to comp.arch.embedded | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

How to avoid a task not executed in a real-time OS? Robert Willy <rxjwg98@gmail.com> - 2019-01-21 04:40 -0800
  Re: How to avoid a task not executed in a real-time OS? John Speth <johnspeth@yahoo.com> - 2019-01-21 06:27 -0800
  Re: How to avoid a task not executed in a real-time OS? Stef <stef33d@yahooI-N-V-A-L-I-D.com.invalid> - 2019-01-21 17:55 +0100
  Re: How to avoid a task not executed in a real-time OS? Richard Damon <Richard@Damon-Family.org> - 2019-01-21 13:05 -0500
    Re: How to avoid a task not executed in a real-time OS? upsidedown@downunder.com - 2019-01-22 08:05 +0200
  Re: How to avoid a task not executed in a real-time OS? Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2019-01-21 22:44 +0100
  Re: How to avoid a task not executed in a real-time OS? David Brown <david.brown@hesbynett.no> - 2019-01-22 09:19 +0100
    Re: How to avoid a task not executed in a real-time OS? Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2019-01-22 22:10 +0100
      Re: How to avoid a task not executed in a real-time OS? Dave Nadler <drn@nadler.com> - 2019-01-22 13:28 -0800
      Re: How to avoid a task not executed in a real-time OS? David Brown <david.brown@hesbynett.no> - 2019-01-23 08:57 +0100
        Re: How to avoid a task not executed in a real-time OS? Paul Rubin <no.email@nospam.invalid> - 2019-01-23 13:13 -0800
          Re: How to avoid a task not executed in a real-time OS? David Brown <david.brown@hesbynett.no> - 2019-01-24 08:31 +0100
  Re: How to avoid a task not executed in a real-time OS? George Neuner <gneuner2@comcast.net> - 2019-01-22 05:01 -0500
  Re: How to avoid a task not executed in a real-time OS? StateMachineCOM <statemachineguru@gmail.com> - 2019-01-28 07:17 -0800
    Re: How to avoid a task not executed in a real-time OS? "A.P.Richelieu" <aprichelieu@gmail.com> - 2019-01-28 20:15 +0100
      Re: How to avoid a task not executed in a real-time OS? StateMachineCOM <statemachineguru@gmail.com> - 2019-01-28 12:31 -0800
        Re: How to avoid a task not executed in a real-time OS? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2019-01-28 16:22 -0500
          Re: How to avoid a task not executed in a real-time OS? Clifford Heath <no.spam@please.net> - 2019-01-29 10:17 +1100
            Re: How to avoid a task not executed in a real-time OS? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2019-01-29 10:08 -0500
              Re: How to avoid a task not executed in a real-time OS? StateMachineCOM <statemachineguru@gmail.com> - 2019-01-29 09:30 -0800
                Re: How to avoid a task not executed in a real-time OS? Tom Gardner <spamjunk@blueyonder.co.uk> - 2019-01-29 18:22 +0000
                Re: How to avoid a task not executed in a real-time OS? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2019-01-29 13:50 -0500
                Re: How to avoid a task not executed in a real-time OS? Clifford Heath <no.spam@please.net> - 2019-01-30 09:45 +1100
                Re: How to avoid a task not executed in a real-time OS? Tom Gardner <spamjunk@blueyonder.co.uk> - 2019-01-30 00:56 +0000
          Re: How to avoid a task not executed in a real-time OS? Reinhardt Behm <rbehm@hushmail.com> - 2019-01-30 13:32 +0800
        Re: How to avoid a task not executed in a real-time OS? "A.P.Richelieu" <aprichelieu@gmail.com> - 2019-01-30 19:07 +0100
  Re: How to avoid a task not executed in a real-time OS? StateMachineCOM <statemachineguru@gmail.com> - 2019-01-30 12:31 -0800
    Re: How to avoid a task not executed in a real-time OS? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2019-01-30 16:23 -0500
    Re: How to avoid a task not executed in a real-time OS? "A.P.Richelieu" <aprichelieu@gmail.com> - 2019-01-31 06:05 +0100
    Re: How to avoid a task not executed in a real-time OS? kegs@provalid.com (Kent Dickey) - 2019-02-02 10:44 -0600
      Re: How to avoid a task not executed in a real-time OS? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2019-02-02 12:19 -0500

csiph-web