Re: sharing data (can ISR be pre-empted???)

["mandeep sandhu" <msandhu_d@xxxxxxxxxxx>]

speaking from  purely 2.4's perspective i don't think an ISR can be 
interrupted
by another ISR because interrupts are disabled while processing an ISR.

and i think ISR's don't have a priority assoicated with them, rather 
INTERRUPTS have
a priority (ISR is a software thing!).

-mandeep

> From: amith <amith@xxxxxxxxxxxxxxx>
> To: mandeep sandhu <msandhu_d@xxxxxxxxxxx>
> CC: KERNEL <kernelnewbies@xxxxxxxxxxxx>
> Subject: Re: sharing data (can ISR be pre-empted???)
> Date: Fri, 04 Jun 2004 14:55:29 +0530
>
> mandeep sandhu wrote:
>
> > can another ISR preempt the current executing ISR!
> > during execution of ISR's are'nt the interrupts disabled?
> >
> > do ISR's also have priority associated with them???
> >
> > i think b4 executing an ISR the kernel calls "preempt-disable"
> > (not very sure though....)???
> >
> > - /dev/mandeep
> >
> >
> > i have read that an ISR can be interrupted by a higer priority ISR,  i 
> > know it in theory , someone could illustrate with an example ? and please 
> > do correct me if i am wrong ?
>
> regards,
> Amith

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