Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!ucsd!ucbvax!NEXTASY2.EECS.WSU.EDU!dwatola
From: dwatola@NEXTASY2.EECS.WSU.EDU
Newsgroups: comp.sys.next
Subject: cthreads and modals
Message-ID: <9009220547.AA16749@nextasy2.eecs.wsu.edu>
Date: 22 Sep 90 04:40:28 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Lines: 25


I am having problems implementing a short program using the cthreads
package.  My program is a front-end to a circuit simulation package; it
accepts simulation parameters from a NeXT-style window and creates a
command line that is passes to system().  This is done in a method which is
cthread_detach(cthread_fork())'ed from the main code.  My hope was to
have this thread run the simulator in the background, then raise an alert
panel when it had finished.

Unfortunately, upon calling NXRunAlertPanel(), i get the error message
"Exception handlers were not properly removed," often followed by
"Attempt to remove unrecognized exception handler."  The program crashes,
usually leaving my application's window on the screen but removing the
icon, menu, and disabling the event loop.  Other times, though, it simply
eats CPU time.

This program works fine if I remove the NXRunAlertPanel() call.  So my question
is, is there some reason why the modal alert panel should not work from an
inferior thread?  Anyone out there got any ideas or educated guesses?

Thanks.

dave watola                        "Lucretia, my reflection, dance the ghost
dwatola@eecs.wsu.edu                with me..."
dwatola@nextasy2.eecs.wsu.edu                   - A. Eldritch