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Date: Mon, 01 Oct 2007 20:42:55 +0200
From: Jan Kiszka <jan.kiszka@domain.hid>
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Subject: Re: [Xenomai-help] [Adeos-main] EBUSY error with rt_intr_create API
	for timer interrupt
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To: poornima r <rpoornar@domain.hid>
Cc: xenomai-help <xenomai@xenomai.org>

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poornima r wrote:
> Hello,
>=20
> I am trying to register an handler for the timer
> interrupt with the following call in my init_module()
> (kernel space) for xenomai domain.
>=20
> err =3D=20
> 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.

> =20
> When I try inseting my module, I get EBUSY error.
>=20
> Is there any problem with the interrupt object
> creation mode (I_SHARED)?
> Why is this error when interrupts can be shared
> between=20
> 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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