Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!newstop!exodus!dmaustin
From: dmaustin@vivid.sun.com (Darren Austin - I will not instigate revolution)
Newsgroups: comp.windows.x
Subject: Re: Debugging XView applications
Message-ID: <DMAUSTIN.90Sep18175303@vivid.sun.com>
Date: 19 Sep 90 00:53:03 GMT
References: <9009181745.AA01140@zia.aoc.nrao.edu>
Sender: news@exodus.Eng.Sun.COM
Organization: Sun Microsystems, Mountain View
Lines: 41
In-reply-to: cflatter@ZIA.AOC.NRAO.EDU's message of 18 Sep 90 17:45:21 GMT

In article <9009181745.AA01140@zia.aoc.nrao.edu> cflatter@ZIA.AOC.NRAO.EDU (Chris Flatters) writes:
   The following reached me via direct email but the reply is probably of
   interest to other xpert subscribers.

   > I have no problem running the program as it is, but when I tried to run the
   > program under dbx and setting a break point in the scroll list notify
   > handler, my olwm just went to lunch... it just locks up. Setting a
   > break point in the button notify routine does not cause the same problem.
   > I have not tried to dbx the program on a local machine yet.

   The cure is simply to set the client into synchronous mode.  The easiest
   way to do this without modifying the source code is to set a breakpoint
   on entry to main().  When the program reaches that point set the external
   variable _Xdebug to true.  Using dbx:

	$ dbx client
	Loading 12345 symbols...
	done
	(dbx) stop in main
	(dbx) run
	stopped in main [blah, blah, blah]
	(dbx) assign _Xdebug = 1

   --------------------------------------
   [%] I don't know what the critical event or events are.

Another tip for debugging XView programs is to use the -Wfsdb
command line option, which will keep XView from doing any grabs
of the server.  So instead of just typing "run", type
"run -Wfsdb". There are other command line options that allow you to
specify that only certain types of grabs shouldn't be done by
XView. You can use the -help option on any XView program to find out what
what is available and how to use them.

Happy debugging,
--Darren
--
Darren Austin                         |  All I have to do is find a
Window Systems Group		      |  one-legged nun walking a 
Sun Microsystems, Mountain View       |  goat and I win!
dmaustin@sun.com	              |