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Re: [rtl] weird problem in Beta11
Stephen Walton wrote:
>
> On Mon, 20 Sep 1999, Edgar F. Hilton wrote:
>
> > So, what I did was to move my rt_task_init() and rt_task_delete() calls to my
> > init_module and cleanup_module routines. Now, I exclusively call
> > rt_task_make_periodic and rt_task_suspend each time I begin running my code or
> > terminating my code, respectively.
>
> I find this fascinating. I was doing this originally in some code I had
> which was set up to send a short string of characters via a serial port
> about 5 times per second to start and stop exposures on a CCD camera (one
> periodic task to start, one to stop). The code for this was very similar
> to the rectangle code in the serial demos directory. I used an RT-FIFO to
> wait for a user to request the camera to start exposing, stop exposing, or
> change the exposure time. When the module got a new time, it would do an
> rt_task_suspend() on the two tasks and then do an rt_task_make_periodic()
> on them again, but with different periods. I saw evidence, though, that
> the tasks were running twice each after this, and wound up with the
> rt_task_delete() calls when changing the exposure times. I found this
> worked fine.
>
> Is there a way to verify all of this by, for example, asking the RT kernel
> to printk() its current list of RT tasks?
>
I have made a small start on a /proc file system for RT tasks.
This would be the best way to go in my book.
Regards
Phil Wilshire
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