How to establish a priority to an interrupt handler

[Monica Puig-Pey <puigpeym@unican.es>]

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?

Thank you

Mónica
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