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From: greenber@timeinc.UUCP (Ross M. Greenberg)
Newsgroups: net.micro.pc
Subject: Re: Backround Processes under MSDOS??
Message-ID: <196@timeinc.UUCP>
Date: Tue, 21-May-85 00:36:28 EDT
Article-I.D.: timeinc.196
Posted: Tue May 21 00:36:28 1985
Date-Received: Fri, 24-May-85 07:36:28 EDT
References: <182@timeinc.UUCP> <38700006@ima.UUCP>
Reply-To: greenber@timeinc.UUCP (Ross M. Greenberg)
Organization: Time, Inc. - New York
Lines: 38

John Levine  (Levine @ YALE.ARPA) talks about ways to "suspend a process"
in MSDOS.  This was in reply to my request regarding the problems of
a non-renterant DOS.


John, the problem with the idea of modifying my code to allow for the
IRET and to install a second flag isn't so easily solved: remember that
code such as COMMAND.COM and commercial packages also call DOS, and
only expect a return from DOS with return code indicating success or
failure.

So, my "transparent" patches to DOS can't return without the
correct status/return code, which can only be determined upon
the return from the "real" DOS, which can only be done when DOS
isn't in use by another process.

So the question still remains: how can I suspend a process under MSDOS
without hogging the CPU and without issuing the IRET?? Again, using the
timer interrupt areas seem legit, but also seems to be a kludge. 

Any other ideas???

(Suggestions to get a different operating system should include the
money to buy one, thank you :-) )


-- 
------------------------------------------------------------------
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.
------
"There's something wrong in the world. There's always been. Something no one
has ever named or explained" --- Francisco d'Anconia