Path: utzoo!censor!geac!jtsv16!uunet!cs.utexas.edu!tut.cis.ohio-state.edu!ucbvax!UXA.CSO.UIUC.EDU!ha90353
From: ha90353@UXA.CSO.UIUC.EDU (Homayoon Akhiani)
Newsgroups: comp.sys.sgi
Subject: (none)
Message-ID: <8911141920.AA13449@uxa.cso.uiuc.edu>
Date: 14 Nov 89 19:20:37 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
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real-time needed

At Aviation Research Lab of University of Illinios, we have a setup consisting
of IRIS 3000's series.  We have a real-time interactive flight simulator.
We need to be able to detect certain events in milliseconds range.
The program consists of a big loop, which creates a frame and check for 
different events.  To record the time of the event, we use times() function
however, if the generation of the frame takes a long time then the timestamp
for the event would be invalid.
The events are joysticks activites send through a serial port from AT machine.
The events will go into a queue till the main loop get the event detection 
part and start processing the events.  
Is there anyway to setup an interupt service or anything else to make the
IRIS timing more accurate ? ( HOW ? )
( It is not a good idea to time stamp the events with the AT, because then
  the AT clock and the IRIS clock must be synchronized. )


Homayoon Akhiani
University of Illinois
Urbana/Champaign
ha90353@uxa.cso.uiuc.edu
akhiani@s.cs.uiuc.edu