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Re: diag_printf


At 14:19 05/03/2003 -0700, you wrote:
On Wed, 2003-03-05 at 14:08, Pete Barrie wrote:
> At 13:58 05/03/2003 -0700, you wrote:
> >On Wed, 2003-03-05 at 13:53, Pete Barrie wrote:
> > > Can somebody tell me what the mutual exclusion issues are with
> > diag_printf()
> > > I cannot find anything specific in the documentation.
> >
> >What sort of issues are you thinking about?
>
> I was wondering whether it was thread-safe.
> I take it that it isn't...
>

It is because interrupts are always off for the duration of
the call to diag_printf().

Gary, many thanks for that clarification. I understand exactly how it is set up now.



Pete



>
> Thanks
>
> Pete
>
>
>
> >'diag_printf()' is designed to be "straight to the hardware",
> >mainly used for diagnostic purposes.  As such, it will access
> >the hardware directly, without any regard for other threads
> >or uses of the diagnostic device.  If you are using a serial
> >port that is also used for diag_printf(), then the diagnostic
> >purpose simply wins.  Other uses of the same hardware are
> >possible, but they need to be cognizant of these facts.
> >
> >--
> >.--------------------------------------------------------.
> >|       Mind: Embedded Linux and eCos Development        |
> >|--------------------------------------------------------|
> >| Gary Thomas              email:  gary dot thomas at mind dot be   |
> >| Mind ( http://mind.be )  tel:    +1 (970) 229-1963     |
> >| gpg: http://www.chez-thomas.org/gary/gpg_key.asc       |
> >'--------------------------------------------------------'
> >
> >
> >--
> >Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
> >and search the list archive: http://sources.redhat.com/ml/ecos-discuss
--
.--------------------------------------------------------.
|       Mind: Embedded Linux and eCos Development        |
|--------------------------------------------------------|
| Gary Thomas              email:  gary dot thomas at mind dot be   |
| Mind ( http://mind.be )  tel:    +1 (970) 229-1963     |
| gpg: http://www.chez-thomas.org/gary/gpg_key.asc       |
'--------------------------------------------------------'


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