how can i send real-time signal?

how can i send real-time signal?

[wael showair]

Hi All,
i m using linux-kernel 2.6.27 & a board of MPC8555 processor.
i have also DSP-core on the same board.

My aim is : Each time the DSP-core interrupts the MPC8555 processor, a
process in the user space will be informed by the arrival of this each
interrupt.

So i decided to use sw signals, in the ISR of the DSP-core interrupt i send
a SW signal to the user space process? Is this the best solution? are there
any better suggestion to achieve my aim? 

i used the kernel API send_sig_info because i want to send information with
the sent signal & my signal type was SIGUSR1

i could receive the SW signal successfully but i found out that the standard
SW signals are not queued if they r in the pending queue of the user space
process but the real-time signals do.
so i changed the type of the signal to SIGRTMIN but unfortunately i could
receive any SW signal from my ISR & i noticed that always the second
interrupt causes a kernel panic

so am i using the correct signal type?
am i using the correct kernel API to send a real-time SW signal?

plz help 
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Re: how can i send real-time signal?

[Benedikt Spranger]

Am Fri, 5 Jun 2009 10:41:56 -0700 (PDT)
schrieb wael showair <showair2003@yahoo.com>:

> My aim is : Each time the DSP-core interrupts the MPC8555 processor, a
> process in the user space will be informed by the arrival of this each
> interrupt.
You should have a look at drivers/uio...

> So i decided to use sw signals, in the ISR of the DSP-core interrupt
> i send a SW signal to the user space process? Is this the best
> solution? are there any better suggestion to achieve my aim? 
signals are expensive. Look at the UIO-Framework for a cheaper solution.
preallocated RT-Signals on the other Hand are fragile. Blocking reads
are cheaper and in case of preempt-RT, but not resticted to it, much
easier to handle.

Bene

Re: how can i send real-time signal?

[wael showair]

Am Fri, 5 Jun 2009 10:41:56 -0700 (PDT)
schrieb wael showair <showair2003@yahoo.com>:

> My aim is : Each time the DSP-core interrupts the MPC8555 processor, a
> process in the user space will be informed by the arrival of this each
> interrupt.
You should have a look at drivers/uio...

> So i decided to use sw signals, in the ISR of the DSP-core interrupt
> i send a SW signal to the user space process? Is this the best
> solution? are there any better suggestion to achieve my aim? 
signals are expensive. Look at the UIO-Framework for a cheaper solution.
preallocated RT-Signals on the other Hand are fragile. Blocking reads
are cheaper and in case of preempt-RT, but not resticted to it, much
easier to handle.

Bene
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