RE: sharing data (can ISR be pre-empted???) correction!

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hi list,

i think i stand corrected, as someone pointed out an ISR for a high priority interrupt
can preempt an ISR for a low priority one....


- mandeep


-----Original Message----- From: kernelnewbies-bounce@nl.linux.org [mailto:kernelnewbies-bounce@nl.linux.org]On Behalf Of mandeep sandhu Sent: Friday, June 04, 2004 3:28 PM To: amith@multitech.co.in Cc: kernelnewbies@nl.linux.org Subject: Re: sharing data (can ISR be pre-empted???)


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@multitech.co.in>
To: mandeep sandhu <msandhu_d@hotmail.com>
CC: KERNEL <kernelnewbies@nl.linux.org>
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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