Re: Weird display problem

• To: Bill Hibbard <billh@xxxxxxxxxxxxx>
• Subject: Re: Weird display problem
• From: Don Murray <dmurray@xxxxxxxxxxxxxxxx>
• Date: Tue, 16 Sep 2003 08:06:32 -0600

One more note-

Bill Hibbard wrote:

If you can toggle any layers on and off then there is no
deadlock, since all DataRenderer.doAction() methods are
invoked in a single loop (at about lines 1684-1699 of
DisplayImpl.java).

I agree.

A good way to analyze deadlocks is to run under jdb. When
you think you have a deadlock, enter the jdb commands
'suspend all' and 'where all'. This will give you a stack
dump with line numbers for each Thread, and you can see
where Threads are waiting inside synchronized() {...}
statements.

You can also get a thread dump at any time by:

- pressing Ctrl-Break on Windows
- sending a kill -QUIT <pid> on Solaris and linux or ctrl-/

See:

http://developer.java.sun.com/developer/technicalArticles/Programming/Stacktrace/

Don
*************************************************************
Don Murray                               UCAR Unidata Program
dmurray@xxxxxxxxxxxxxxxx                        P.O. Box 3000
(303) 497-8628                              Boulder, CO 80307
http://www.unidata.ucar.edu/staff/donm
*************************************************************

• References:
  • Re: Weird display problem
    • From: Bill Hibbard