How to establish a priority to an interrupt handler

Hi,

I'm using Ubuntu 10.04 with the 2.6.31-11-rt patch installed. I'm developing a PCI device driver using hardware interrupts.
As I read at the RT wiki
(https://rt.wiki.kernel.org/index.php/CONFIG_PREEMPT_RT_Patch ) interrupts are moved to kernel threads called Threaded Interrupts in the RT patch.

I would like to give a priority chosen by me to my IRQ handler, but I don't know how to do it, or if it is possible (it seems it is).

I've found (http://lwn.net/Articles/302043/ ) that what I had to use in order to get Threaded Interrupt is:

int request_threaded_irq(unsigned int irq, irq_handler_t handler,
irq_handler_t quick_check_handler, unsigned long flags, const char *name, void *dev)

But there is not priority there!

Using ps -eo pid,pri,rtprio,cmd I've seen my handler runs with priority 50.

I also used :

int request_irq (unsigned int irq, void (*handler) (int, void *, struct pt_regs *), unsigned long irqflags, const char *devname, void *dev_id);

and using ps command here my handler still runs with priority 50. Shouldn't it work as a non threaded interrupt then? Why 50 instead 99 or the highest priority one?

Which function should I use to chose the priority for the IRQ thread?

Is there any other function to call from this context where my handler could know its priority?

Please I wish to be personally CC'ed the answers/comments posted to the list in response to my posting because I'm not subscribed to the list.

Thank you very much

Mónica

Please note that
1) priorities are relative to the other priorites currently in use, so assigning a fixed priority does not make sense unless you know all the other priorites; and
2) it is the job of the administrator, not of the driver writer, to determine which device gets the highest priority.

Regards,
Clemens