Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!elroy.jpl.nasa.gov!decwrl!fernwood!portal!cup.portal.com!Howard_Reed_Johnson
From: Howard_Reed_Johnson@cup.portal.com
Newsgroups: comp.sys.novell
Subject: Re: Undocumented IPX / SPX Functions ---- HELP !!!!
Message-ID: <42122@cup.portal.com>
Date: 8 May 91 08:06:14 GMT
References: <8547.28218efb@dit.ie>
Organization: The Portal System (TM)
Lines: 17

Mario Barzil <tgaffney@dit.ie> asks:

> Is there a CRITICAL Section Flag in IPX to prevent Interrupt
> driven programs re-entering IPX?

IPX uses critical sections to control reentrancy *within* IPX, but
this state is only available to the LAN driver at times when it is
being called by IPX.  It does not prevent ECB's from being submitted
to IPX.

> I am working on a routine which receives data on interrupt from a
> remote pc and passes it on to IPX.  It works OK if only One PC
> is using IPX, But collisions HANG the PC with the CARD.

IPX Event Service Routines must be reentrant.  If an event is being
serviced by an ESR and another event arrives, the new event must be
queued internally by that ESR.