I am tearing my hair out here with yet another retain issue with the
NSAutounbinder. I don't know what I am doing to keep hitting these problems,
and unfortunately going back through peoples past (very helpful) replies to my
questions on both this and blocks+autorelease pools has not shed any light on
things for me.
The situation I have is I have a sheet on a window, with the sheet containing a
progress indicator (and time estimate). This has a window controller associated
with it, called CocoaProgressWindow (which is also the window delegate). I
release the window controller, and soon afterwards its retain count falls to
zero (as it should). However, this nasty NSAutounbinder thingy then jumps in
and re-retains it in some evil under-the-covers voodoo to do with avoiding
retain cycles (as I understand it). Unfortunately the balancing autorelease
only occurs 16 seconds later when I move the mouse! While not catastrophic this
is pretty annoying and looks rather embarrassing.
Can anybody suggest what might be happening here? I can only assume I am doing
something wrong somewhere along the line, although I cannot imagine what it
might be! I have recorded full callstacks of every time my retain/release is
called:
http://www.dur.ac.uk/j.m.taylor/complete-call-stack.txt
a version editing out the really obvious, balanced retain/releases that I know
about:
http://www.dur.ac.uk/j.m.taylor/call-stack-shortened.txt
and one edited down to just show the two dodgy callstacks at the end:
http://www.dur.ac.uk/j.m.taylor/call-stack-shortened-2.txt
In general terms, I am running some demanding work (generating a movie file) on
a GCD serial thread using dispatch_async and there is then a second nested
dispatch_async back onto the main queue, from which I release the window
controller. It is when that block is destroyed that the final "real" release
occurs and the NSAutounbinder stuff happens. This is under Snow Leopard, no GC
or ARC. It might be relevant that I am running with Mike Ash's
ZeroingWeakReference code compiled in, although the code in question here makes
no use of that facility whatsoever.
Can anybody speculate what my problem might be, and how I can deal with it?
Many thanks
Jonny
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