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Article #4427Re: TSR PROGRAMMING PROBLEM
From: Charlap
Date: Tue, 29 Jan 1991 23:10
Date: Tue, 29 Jan 1991 23:10
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In article <5369@trantor.harris-atd.com> sonny@trantor.harris-atd.com (Bob Davis) writes: >In article <1991Jan29.173752.10045@bronze.ucs.indiana.edu> yawei@bronze.ucs.indiana.edu (mr. yawei) writes: >>In article <8256@ucdavis.ucdavis.edu> chiang@iris.ucdavis.edu (Tom Chiang) writes: >>> > [DELETIONS] >> >>This is called the DOS re-entrancy problem which anyone who is teaching >>you to write TSRs should have told you about. Simply speaking, DOS >>cannot be entered twice. Not quite. DOS re-enters itself all over the place. There is a scheduler interrupt (I forget what it is, though) which is very undocumented, which many hackers use for making re-entrant TSR's. Most notable of these is the DOS PRINT command, which uses the scheduler interrupt in order to do background printing. Does anyone have more info? Something was mentioned in the book "The MS-DOS BIBLE" by the Waite group, but it isn't too detailed. --- Dave (cd5340@mars.njit.edu)
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!bcm!dimacs.rutgers.edu!aramis.rutgers.edu!paul.rutgers.edu!njin!njitgw!mars.njit.edu!cd5340 From: cd5340@mars.njit.edu (Charlap) Newsgroups: comp.os.msdos.programmer Subject: Re: TSR PROGRAMMING PROBLEM Message-ID: <2168@njitgw.njit.edu> Date: 29 Jan 91 23:10:04 GMT References: <8256@ucdavis.ucdavis.edu> <1991Jan29.173752.10045@bronze.ucs.indiana.edu> <5369@trantor.harris-atd.com> Sender: news@njitgw.njit.edu Organization: New Jersey Institute of Technology Lines: 20