Path: utzoo!utgpu!water!watmath!clyde!bellcore!decvax!decwrl!sun!pitstop!sundc!seismo!uunet!mcvax!unido!rmi!kkaempf
From: kkaempf@rmi.UUCP (Klaus Kaempf)
Newsgroups: comp.sys.amiga
Subject: Re: Problem with Cause()
Keywords: .tech (split? vote NO!)
Message-ID: <874@rmi.UUCP>
Date: 13 Feb 88 14:24:00 GMT
Reply-To: kkaempf@rmi.de (Klaus Kaempf)
Organization: RMI Net, Aachen, W.Germany
Lines: 23
Posted: Sat Feb 13 15:24:00 1988

In article <8801271950.AA24675@cory.Berkeley.EDU>
dillon@CORY.BERKELEY.EDU (Matt Dillon) writes:
> Try setting the interrupt.is_Node.ln_Type to something
> other than NT_SOFTINT. (I haven't tried this myself, but
> the ROM code for Cause() seems to ignore interrupt nodes
> set to NT_SOFTINT.

It's not really ignored. "Cause()" does the following:

1. Change node type from NT_INTERRUPT to NT_SOFTINT.
2. Link the interrupt structure according to priority into
   the appropriate exec-softint-list.
3. Request a software interrupt.

The software interrupt handler then processes all the five
softint lists and restores the node type to NT_INTERRUPT
after removing the node from the list. So this node type is
used to avoid double queueing of a single software interrupt
structure.

!ralph

Ralph Babel, Falkenweg 3, D-6204 Taunusstein, FRGermany