Article View: comp.os.os2.programmer
Article #3174Re: Sharing Interrupts on a PS/2
From: John Radigan
Date: Tue, 04 Jun 1991 14:08
Date: Tue, 04 Jun 1991 14:08
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1243 bytes
From article <1991May31.194019.3122@dialogic.com>, by gerry@dialogic.com (Gerry Lachac):
> Driver A calls SetIRQ(3,ISRa) and later,
> Driver B calls SetIRQ(3,ISRb)
>
>
> When an interrupt 3 comes in, does OS/2 call Driver A's ISR first
> (since it was the first set) or Driver B's?
I quote from IBM OS/2 Programming Tools and Information 1.2, I/O Subsystems and
Device Support, Volume 1, page 2-20.
"POSITION RULE An interrupt handler that shares an interrupt level must
not depend on its position in the list of handlers for that inter-
rupt level."
There is no mention of the calling sequence applied by the interrupt manager.
--
John Radigan, Star Gate Technologies, Inc., Solon, Ohio
Email: jjr@sgtech.uucp Telephone: (216) 349-1860 x666
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!sdd.hp.com!spool.mu.edu!agate!usenet.ins.cwru.edu!ncoast!sgtech!sgtech.UUCP From: jjr@sgtech.UUCP (John Radigan) Newsgroups: comp.os.os2.programmer Subject: Re: Sharing Interrupts on a PS/2 Message-ID: <87@sgtech.UUCP> Date: 4 Jun 91 14:08:35 GMT Article-I.D.: sgtech.87 References: <1991May31.194019.3122@dialogic.com> Sender: news@sgtech.UUCP Lines: 21