[Adeos-main] EBUSY error with rt_intr_create API for timer interrupt

[Adeos-main] EBUSY error with rt_intr_create API for timer interrupt

[poornima r]

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);
 
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?


Poornima










 


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

[Jan Kiszka]

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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


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