Re: [Xenomai-help] [Adeos-main] EBUSY error with rt_intr_create API for timer interrupt

[Jan Kiszka <jan.kiszka@domain.hid>]

[-- Attachment #1: Type: text/plain, Size: 1071 bytes --]

poornima r wrote:
> Hello,
> 
> I am trying to register an handler for the timer
> interrupt with the following call in my init_module()
> (kernel space) for xenomai domain.
> 
> err = 
> rt_intr_create(&intr_desc,"ir-xenomai",TIMER_INTERRUPT,
> &ir_handler,NULL, I_SHARED);

Xenomai questions are better addressed to Xenomai mailing lists. I moved
this thread therefore.

>  
> When I try inseting my module, I get EBUSY error.
> 
> Is there any problem with the interrupt object
> creation mode (I_SHARED)?
> Why is this error when interrupts can be shared
> between 
> Xenomai and Linux?

Generally, sharing IRQs between the RT and the non-RT (Linux) domain is
a very tricky thing that quickly makes your box instable or at least
indeterministic.

Specifically for sharing the timer IRQ, the Xenomai with the help of the
I-pipe patch provides fine APIs so that you don't need to mess with
internals, just have a look at the docs. Because Xenomai already manages
the timer IRQ in the RT domain, rt_intr_create denies the access.

Jan


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 249 bytes --]