Path: utzoo!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!uunet!cs.utexas.edu!yale!eagle.wesleyan.edu!rcook
From: rcook@eagle.wesleyan.edu
Newsgroups: comp.sys.mac.programmer
Subject: my driver stalls!
Message-ID: <1990Nov11.232728.35684@eagle.wesleyan.edu>
Date: 12 Nov 90 04:27:27 GMT
Lines: 23

I am currently working on a driver that gets installed by an init and plays
a sound every Friday at 6pm (don't ask why--it's for a friend :-).  The init
apparently works, and receives noErr from the OpenDriver call.  The problem is
that the system crashes when the Finder is launched.  The usual problem is a
line 1111 error.  When I install the driver from within an application, there
is no problem as long as the application is running, but, again, when the
application quits and the finder starts up (or even when control is returned to
LSP 3.0) the system crashes.

The driver has a delay of 600 (every 10 seconds) and is marked 'locked' and
'system heap'.  To check if it was any of the code in the driver, I pared it
down so that it does nothing but return noErr on all calls and still the system
crashes.  I suspect is is not some sort of heap problem, because it isn't even
using local variables, let alone globals or making toolbox calls.

I need to know if there is some trick to having drivers remain installed and
running when you switch applications.  The driver is written using THINK Pascal
3.0.  I've read every tech note and every page of IM I could find relating to
this, and fond nothing.  Please e-mail or post anything you know on this
subject.  Thanks,

Randall Cook
rcook@eagle.wesleyan.edu