Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!bionet!agate!saturn!ucscd.UCSC.EDU!biling
From: biling@ucscd.UCSC.EDU (Doug Rosener)
Newsgroups: comp.sys.mac.programmer
Subject: Turning off interrupts
Message-ID: <6683@saturn.ucsc.edu>
Date: 15 Mar 89 04:01:36 GMT
References: <457@sys.uea.ac.uk> <7550@polya.Stanford.EDU> <27058@apple.Apple.COM> <477@sys.uea.ac.uk>
Sender: usenet@saturn.ucsc.edu
Reply-To: biling@ucscd.UCSC.EDU (Doug Rosener)
Organization: University of California, Santa Cruz; CATS
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I am writing a program that is very sensitive to timing.  Right after a
picture is displayed, a routine which digitizes the operators voice is
activated. Idealy, there is no delay, but a fixed <1ms delay is
acceptable.

Right now I am getting variable delay (~10ms). Is it the interrupts?

I am not clear about the mac os.  If I turn off the interrupts for the
68000 while this part of the program is running, 
will I ruin anything (assuming I don't care about keeping the tick 
count and time accurate?).  Will the display suffer?

If it is okay to turn off the interrupts, is there a convenient way to
do this hi-level?.


Thanks
Doug Rosener
biling@ucscd.BITNET
biling@ucscd.ucsc.EDU