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From: wras@walt.cc.utexas.edu (Steve Mariotti)
Newsgroups: comp.sys.mac.programmer
Subject: VBL Tasks etc
Summary: vbls in the system heap vs. appl heap
Keywords: vertical retrace VBL interrupt
Message-ID: <29470@ut-emx.UUCP>
Date: 4 May 90 04:25:49 GMT
References: <555@argosy.UUCP> <584@dlogics.COM>
Sender: news@ut-emx.UUCP
Reply-To: wras@walt.cc.utexas.edu (Steve Mariotti)
Organization: The University of Texas at Austin, Austin, Texas
Lines: 25

I know this is probably a silly question, but say that a VBL task is installed
in the application heap.  If Multifinder is running, doesn't this present big
huge tremenous problems when this application is switched out?  Should the
task itself keep track of which A5 is current?  If so, whats the best way to
keep it in the task?

Are there advantages to just trying to install it in the system heap and then
remove it from there?  It doesn't seem like that would be necessary, but 
then I don't want it to come to a bone-shattering crash when multifinder
brings another app to the foreground.

Also, are there any code fragments floating about which demonstrate a self-
aware VBL task?  

Thanks a lot.

Ste
 ______  _____________________________________________________________________
| ____ |   Steve Mariotti -- University of Texas at Austin -- CS Undergrad(e) |
||    || ---------------------------------------------------------------------|
||    || wras@ccwf.cc.utexas.edu | csar242@ix1.cc.utexas.edu | AOL:SteveM16   |
| ---- | ---------------------------------------------------------------------|
|.  -- |          "Wouldn't be prudent, not at this juncture."                |
|______| ---------------------------------------------------------------------'
|______|          function introspanish(time : longint) : pain;