Article View: comp.windows.ms.programmer
Article #1745Re: Allocating Fixed Memory
From: PETE YOXALL
Date: Tue, 19 Mar 1991 17:08
Date: Tue, 19 Mar 1991 17:08
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In article <1991Mar12.183751.26640@sunee.waterloo.edu> gpsteffl@sunee.waterloo.edu (Glenn Patrick Steffler) writes: > >GlobalDOSAlloc () is to be used to pass data to DOS TSR's or provide >buffers for real mode device drivers. Please use this sparingly. > It may be worth adding that this type of buffer only exists in the Windows virtual machine. If a VM switch occurs (e.g a DOS shell gets a timeslice), a TSR that had remembered the buffer address and tried to use it (maybe because a h/w interrupt occurs) would scribble where it shouldn't or read garbage. -- Peter Yoxall : email : petey@boldon-james-limited.co.uk Boldon James Ltd, Congleton, UK : phone : +44 260 280465
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!spool.mu.edu!snorkelwacker.mit.edu!bloom-beacon!eru!hagbard!sunic!mcsun!ukc!pyrltd!bjcong!petey From: petey@bjcong.bj.co.uk (PETE YOXALL) Newsgroups: comp.windows.ms.programmer Subject: Re: Allocating Fixed Memory Keywords: Fixed Memory Locking Message-ID: <1163@bjcong.bj.co.uk> Date: 19 Mar 91 17:08:34 GMT References: <23883@hydra.gatech.EDU> <1991Mar12.183751.26640@sunee.waterloo.edu> Reply-To: petey@bjcong.UUCP (PETE YOXALL) Organization: Boldon James Limited (Congleton, UK) Lines: 13