Re: [Xenomai] how to force task switch to primary mode

[Johann Obermayr <johann.obermayr@sigmatek.at>]

Hello,

Am 25.11.2015 um 18:20 schrieb JK.Behnke@web.de:
>     Hello,
>
>     an rtdm driver that I use requires the rt_dev_open call to be executed
>     in primary mode.
>     With xenomai 2.4.2 it was possible to switch to primary mode using
>     rt_task_set_mode(0, T_PRIMARY, NULL);
>
>     Now I use xenomai 2.6.3, but I can't find the T_PRIMARY flag.
>     Is there an other alternative to force the task to switch to primary
>     mode?
>
>     Would I have to change the rtdm driver, so xenomai performs the mode
>     switch automatically?
>
>     Thanks in advance for any hint.
>     Jochen
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>
in the file API.CHANGES:
2.5.5 -> 2.6.0

        * rt_task_set_mode() does not support the T_PRIMARY bit
          anymore; the latter has been replaced by T_CONFORMING, which
          is allowed in the setmask only, and only effective for
          real-time shadows.

      In other words,

      - rt_task_set_mode(clrmask, setmask=T_PRIMARY, &oldmode)
        becomes:
        rt_task_set_mode(clrmask, setmask=T_CONFORMING, &oldmode),
        forcing primary mode only for SCHED_FIFO Xenomai threads
        only. Nop otherwise (i.e. a non real-time shadow remains
        in relaxed mode after the syscall has returned, since this
        is its conforming runtime mode).

      - rt_task_set_mode(clrmask=T_CONFORMING, setmask, &oldmode)
      always begets -EINVAL.

Regards
   Johann