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From: greenber@timeinc.UUCP (Ross M. Greenberg)
Newsgroups: net.micro.pc
Subject: Backround Processes under MSDOS??
Message-ID: <182@timeinc.UUCP>
Date: Tue, 14-May-85 09:09:05 EDT
Article-I.D.: timeinc.182
Posted: Tue May 14 09:09:05 1985
Date-Received: Thu, 16-May-85 21:16:33 EDT
Distribution: net
Organization: Time, Inc. - New York
Lines: 34

I'm in the process of writing up a backround processor of sorts under
MSDOS.  So I have already discovered the hard way that DOS is
non-re-entrant :-)

So I have taken over the DOS vector(s) and have the capability now
of determining if I am already in a DOS call.  The question that arises
is:

If I determine that I am in a dos call, how can I "suspend" the "process"
without executing an IRET.  Now the best method is probably to actually
execute the IRET, and then call the timer every 1/18.2 seconds to
determie if the guy that I'm executing can now call DOS.

I'd rather have a nice easy method (as the result of this program will
go public domain if it works).

Any ideas, suggestions, wishes??
I'll post the reults, etc.

Thanks!!

-- 
------------------------------------------------------------------
Ross M. Greenberg  @ Time Inc, New York 
              --------->{ihnp4 | vax135}!timeinc!greenber<---------

	Timeinc probably wouldn't acknowledge my existence, and has
	opinions of its own.  I highly doubt that they would make me
	their spokesperson.
------
"If ever the pleasure of one has to be bought by the pain of the other,
 there better be no trade. A trade by which one gains and the other
 loses is a fraud."         --- Dagny Taggart