Hi! pascal.
First of all, I am sorry for missing your first letter and i had no experience of RTAI.
I am going to explain what i am thinking as a solution in case of RTL.
I hope you can use RTL instead of RTAI.
But the following method is not verified.
1. Install your linux interrupt handler as a soft interrupt handler using
'rtl_get_soft_irq()'
2. In real-time interrupt handler, use 'rtl_global_pend_irq()' to call your linux
interrupt handler.
----- Original Message -----
From: "Pascal Charest" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, June 21, 2000 1:54 AM
Subject: Re: [rtl] Interrupts
> Hi,
>
> So, if I can't call Linux interrupt handler within an RTAI handler, can
> I use two independant handlers ; one from RTAI and the other from Linux?
>
> I've a driver that uses Linux interrupt handler. Then, I want a
> realtime process that is calling by the same interrupt. When I'm using
> rt_request_global_irq() and doing nothing in my handler, the system
> restart or all is ok ; it depends of the Linux driver I use.
>
> How can I activate, if I can, Linux handler using the same irq? I've
> used rt_pend_linux_irq() in my handler but it may crash too.
>
> Pascal
> Charest
>
> Karim Yaghmour wrote:
> >
> > Hello Pascal,
> >
> > I beleive the problem comes from the fact that you are calling the
> > Linux interrupt handler from within an RTAI handler. Since Linux
> > interrupt handlers might call on lock mechanisms redirected by
> > RTAI, this is where things get messy.
> >
> > Rather than using rt_request_global_irq(), try using rt_request_linux_irq().
> > What this will do is add your handler to the list of handlers linux
> > will call when the IRQ happens. Therefore, the normal handler gets
> > called and so does yours. Your handler can then use RTAI locking
> > mechanisms to do it's work.
> >
> > This is actually currently used from within the RTAI schedulers to
> > try recovering lost jiffies (this is from start_rt_timer in the upscheduler):
> > rt_request_linux_irq(TIMER_8254_IRQ, recover_jiffies, "rtai_sched",
>recover_jiffies);
> >
> > The recover_jiffies function now gets called every time a timer
> > interrupt gets to Linux.
> >
> > J'espere que ca pourra vous aider ...
> >
> > Karim
> >
> > Pascal Charest wrote:
> > >
> > > Hi,
> > >
> > > I'm trying to catch interruptions with rtai and forcing the linux
> > > interrupt handler, but I don't know how to do it correctly. In fact, I
> > > want to use different drivers with my rt_process and to make them
> > > realtime without changing their code. There is a example of what I want
> > > to do :
> > >
> > > void handler(int irq)
> > > {
> > > ... forcing linux interrupt handler
> > > ... doing my own work
> > > }
> > >
> > > int init_module()
> > > {
> > > ...
> > > rt_request_global_irq(IRQ, (void*)handler);
> > > rt_startup_irq(IRQ);
> > > ...
> > > }
> > >
> > > When I try something, linux stops or the computer restarts when the
> > > interrupt occurs ; it depends of the rt fonctions I use in my handler.
> > > Do someone know how to do it?
> > >
> > > Thanks in advance,
> > >
> > > Pascal Charest
> > > -- [rtl] ---
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> > > For more information on Real-Time Linux see:
> > > http://www.rtlinux.org/rtlinux/
> >
> > --
> > ===================================================
> > Karim Yaghmour
> > [EMAIL PROTECTED]
> > Operating System Consultant
> > (Linux kernel, real-time and distributed systems)
> > ===================================================
> > -- [rtl] ---
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>
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