[TUHS] re: Raise of interrupt level necessary

Wolfgang Helbig helbig at Informatik.BA-Stuttgart.DE
Sun Dec 15 19:52:22 AEST 2002

>Date: Sat, 14 Dec 2002 15:27:40 -0800

Michael Davidson wrote:
>If you think that the "rule" is "no ISR can touch user space while
>interrupting a kernel process", then it is display() that breaks
>the rule.

The point is, that this rule leads to somewhat simpler and therefore
better code -- breaking the rule calls for some justification.
Calling display() from the clock-ISR is the only place where an ISR does
not conform to this rule.


Wolfgang Helbig

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