I know about issues with threads (I've been bitten by them
before), and I understand it's a deadlock problem, but these are
threads spawned by AppKit itself. And I am not updating anything
at the point where the freeze happens. I'm simply putting the
window on-screen. As I wrote, a similar deadlock problem appeared
at the same time with a panel that would freeze when putting it on-
screen, but I was able to fix it simply by recreating the panel
from scratch in Interface Builder. Yet, this simple solution
doesn't seem to work for the window at hand. It looks like it may
be time to call in Apple DTS. I'd rather have used my support
incident for something more exciting....
I think you have a 3rd thread involved in this issue that you
didn't list or possibly somehow you hit an exception that causes an
unrolling of things without correctly unlocking the view hierarchy
lock. Look for console error messages from your application and
look at other threads in your application.
Well, when I pause the app during the deadlock with an empty doc open
there are ever only two threads, so I'm not aware of any more
threads. Although the app is multi-threaded pretty much from the
start, there are not necessarily threads spawned by it at the point
of the deadlock. (The freeze happens whether an untitled empty
document is opened or a document with a lot of pages, with a custom
process spawned into the background still processing a number of
items (in which case there are three threads when the app is paused,
the two deadlocked ones and the app's worker thread).)
Can't find meaningful error messages.
What I _have_ discovered meanwhile is that if I bring up the window
in question before opening any document windows, then close it, the
next time I bring it up with any document windows open everything
works fine. Interestingly, if I open a document first, then close it,
and with no document windows open then bring up the problem window
then the deadlock still happens. I'll investigate this tomorrow with
a fresh head, since I think this might provide a lead.
