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From: info-mac@uw-beaver (info-mac)
Newsgroups: fa.info-mac
Subject: Re: Vertical Retrace
Message-ID: <1520@uw-beaver>
Date: Mon, 27-Aug-84 02:01:56 EDT
Article-I.D.: uw-beaver>.1520
Posted: Mon Aug 27 02:01:56 1984
Date-Received: Wed, 22-Aug-84 00:36:52 EDT
Sender: daemon@uw-beave
Organization: U of Washington Computer Science
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From: Michael Rubin 
	Does anyone know why the Memory Manager shouldn't be
	called by vertical-retrace tasks?

Probably because the Memory Manager isn't reentrant; if it happened to be in
the middle of an operation when a vertical-retrace interrupt happened, and the
retrace task called it too, its data structures would get trashed.  It just
wasn't designed for multitasking.
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