Why ms-dos is non reentrant

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#1179

From: Pinar Aydemir
Date: Tue, 01 Sep 1992 12:20

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I almost hear everyday that msdos is non-reentrant.
It is non re-entrant so dont call a dos funcion from a Interrupt Service
Routine.
Since It is non reentrant, bla bla bla.

I looked at some books about OS, and the definition of reentrancy is
given as being unmodified (pure) code.So, what makes msdos non reentrant ?
Any information  is appreciated.
-Yasemin

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Path: arc1-ca.pugleaf.net!sparky!uunet!news.univie.ac.at!blekul11!frmop11!trearn!trmetu!a10742
Organization: Middle East Technical University - Computer Center
Date: Tuesday, 1 Sep 1992 12:20:42 TUR
From: Pinar Aydemir <A10742@TRMETU.BITNET>
Message-ID: <92245.122042A10742@TRMETU.BITNET>
Newsgroups: comp.os.msdos.programmer,comp.os.msdos.misc
Subject: Why ms-dos is non reentrant
Lines: 9