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Groups > comp.arch.embedded > #27952

Re: "Boost context" for task switching on embedded Linux on ARM

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George Neuner <gneuner2@comcast.net> writes:
> Multi-tasking with [setjmp/jmp_buf] is another issue.  It's generally
> pretty easy to set up a new stack, but initializing all the other CPU
> state for the new "task" can be problematic.  It was easier to do with
> simpler CPUs.  It still can be done with a modern CPU, but it is much
> more difficult to get everything right [the more so for lack of
> documentation].

This sounds pretty horrendous and compiler and hardware dependent.  You
are basically writing a miniature OS in your scheduler.  It helps if the
compiler docs explicitly say it's supposed to work.  Otherwise, if you
reverse engineer it for a particular compiler version, all bets are off
for the next one.

There are some very lightweight RTOS out there and it's probably saner
to just use one instead of a hack like this.

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"Boost context" for task switching on embedded Linux on ARM gp.kiwi@gmail.com - 2018-08-03 05:52 -0700
  Re: "Boost context" for task switching on embedded Linux on ARM George Neuner <gneuner2@comcast.net> - 2018-08-04 03:28 -0400
    Re: "Boost context" for task switching on embedded Linux on ARM Niklas Holsti <niklas.holsti@tidorum.invalid> - 2018-08-04 11:13 +0300
      Re: "Boost context" for task switching on embedded Linux on ARM George Neuner <gneuner2@comcast.net> - 2018-08-04 07:08 -0400
        Re: "Boost context" for task switching on embedded Linux on ARM George Neuner <gneuner2@comcast.net> - 2018-08-04 07:22 -0400
          Re: "Boost context" for task switching on embedded Linux on ARM graeme.prentice@gmail.com - 2018-08-04 04:49 -0700
            Re: "Boost context" for task switching on embedded Linux on ARM "gp...@gmail.com" <graeme.prentice@gmail.com> - 2018-08-04 05:25 -0700
              Re: "Boost context" for task switching on embedded Linux on ARM graeme.prentice@gmail.com - 2018-08-04 06:01 -0700
                Re: "Boost context" for task switching on embedded Linux on ARM George Neuner <gneuner2@comcast.net> - 2018-08-06 04:17 -0400
                Re: "Boost context" for task switching on embedded Linux on ARM Paul Rubin <no.email@nospam.invalid> - 2018-08-06 11:21 -0700
                Re: "Boost context" for task switching on embedded Linux on ARM Niklas Holsti <niklas.holsti@tidorum.invalid> - 2018-08-06 22:48 +0300
                Re: "Boost context" for task switching on embedded Linux on ARM gp.kiwi@gmail.com - 2018-08-07 04:43 -0700
                Re: "Boost context" for task switching on embedded Linux on ARM George Neuner <gneuner2@comcast.net> - 2018-08-07 15:10 -0400
                Re: "Boost context" for task switching on embedded Linux on ARM Niklas Holsti <niklas.holsti@tidorum.invalid> - 2018-08-07 22:41 +0300
                Re: "Boost context" for task switching on embedded Linux on ARM George Neuner <gneuner2@comcast.net> - 2018-08-08 00:42 -0400
                Re: "Boost context" for task switching on embedded Linux on ARM Niklas Holsti <niklas.holsti@tidorum.invalid> - 2018-08-08 08:21 +0300
                Re: "Boost context" for task switching on embedded Linux on ARM George Neuner <gneuner2@comcast.net> - 2018-08-09 10:55 -0400
                Re: "Boost context" for task switching on embedded Linux on ARM Niklas Holsti <niklas.holsti@tidorum.invalid> - 2018-08-09 22:14 +0300
            Re: "Boost context" for task switching on embedded Linux on ARM George Neuner <gneuner2@comcast.net> - 2018-08-06 04:04 -0400
              Re: "Boost context" for task switching on embedded Linux on ARM gp.kiwi@gmail.com - 2018-08-06 04:09 -0700
                Re: "Boost context" for task switching on embedded Linux on ARM George Neuner <gneuner2@comcast.net> - 2018-08-06 12:29 -0400

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