Re: [Xenomai-help] 3rd party task mode switches and inquiries

[Philippe Gerum <rpm@xenomai.org>]

On Mon, 2006-10-09 at 11:38 -0500, Jeff Weber wrote:
> I have a need for task t1 to switch task t2 to and from primary mode,
> using the native API.  The rt_task_set_mode() API does not have an
> argument for the target task, and assumes the current task.  How can I
> initiate a 3rd party task mode switch?
> 

You can't, it's forbidden. Too many indirect issues would become
possible as a result of allowing that. Only the current task can switch
its own mode.

> On a related note, the task info returned from rt_task_inquire() does
> not indicate task mode switches in the corresponding T_PRIMARY (0x200)
> bit, which is the bit used to command the mode switch.  However, a mode
> switch can be seen in the 0x100 status bit, which corresponds to the
> XNRELAX bit, (not in the public native/task.h API).  What's the best way
> to inquire if an arbitrary task is in primary or secondary mode?
> 

Testing XNRELAX is the current way to do it, since no native interface
exists yet. Before this happens, there's some sanitization to do first
(e.g. if T_PRIMARY is used to switch mode, it should be usable to check
the status word too, instead of having T_SECONDARY as XNRELAX but which
could not be used for switching modes).

> I am using Xenomai-2.2.0.
> 
> thanks,
> 	Jeff Weber
> 
> 
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-- 
Philippe.