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From: D0430@PUCC.BITNET (Paul Lansky)
Newsgroups: net.unix-wizards
Subject: DELAY
Message-ID: <1142@PUCC.BITNET>
Date: Tue, 30-Sep-86 23:35:01 EDT
Article-I.D.: PUCC.1142
Posted: Tue Sep 30 23:35:01 1986
Date-Received: Fri, 3-Oct-86 00:51:06 EDT
Reply-To: D0430@PUCC.BITNET
Organization: Princeton University Computing Center, Princeton, New Jersey
Lines: 16

In a driver we have for some D-A converters (under Ultrix 1.1)
I put a DELAY(bignumber) (about 1/2 second) in at clean-up time to
give the DACs a chance to reset themselves properly.  This has
the effect, however, of suspending all system activity for that
amount of time.  From the looks of the code (in machdep.c) I don't
see why this would happen since there seems to be no relevant spl().
I ain't no wizard so I may be missing something fundamental.
Can someone suggest an alternate approach?
 
Thanks
 
Paul Lansky
Music Department
Princeton University
            {seismo,ucbvax} .. princeton!winnie!paul
or d0430@pucc (on bitnet)