Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!usc!apple!Apple.COM!lsr
From: lsr@Apple.COM (Larry Rosenstein)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Is multifinder or finder running??
Message-ID: <5541@internal.Apple.COM>
Date: 1 Dec 89 18:52:18 GMT
Sender: usenet@Apple.COM
Organization: Objects-R-Us,  Apple Computer, Inc.
Lines: 24
References:<17708@ea.ecn.purdue.edu> <5499@internal.Apple.COM> <21640@ut-emx.UUCP>

In article <21640@ut-emx.UUCP> xdaa374@ut-emx.UUCP (Vance Strickland) 
writes:
> I would like to chack for the presence for task swapping:  specifically, 
I'd
> like to avoid running when the user has the ability to switch from one

This seems equivalent to the question "Does a sublaunch return to the 
caller?"  (Under MultiFinder, if you sublaunch a program, your application 
does not quit.)

The Tech Notes explain that this is a valid question, for which there is 
currently no explicit answer.  (In the future there may be a way to detect 
this.)  I think the best suggestion is to check for the presence of the 
_OSDispatch trap, and if it exists assume that task switching is present.  

Unfortunately, this isn't guaranteed to be true in the future; for 
example, a future system might provide the MultiFinder memory calls all 
the time.

Larry Rosenstein, Apple Computer, Inc.
Object Specialist

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