I'm wondering about the timing of NSOperationQueue emptying.
In my Objective-C++ (Leopard) app, I have one opQueue of operations and the
very last thing each operation does is enqueue the results of a computation
back to the main thread.
NSPointerArray *ptr = [NSPointerArray pointerArrayWithStrongObjects];
[ptr addPointer:&PL];
[mainQueue enqueueNotification:[NSNotification
notificationWithName:@"compNotif"
object:ptr]
postingStyle:NSPostNow];
} // end of main()
I use NSPostNow instead of NSPostWhenIdle because the latter never posts!
(reason unknown) Also, I have garbage collection *required* and do not have
any retain/release statements anywhere.
PL, the output data, is a local std::list [C++ default Ctors/Dtors is
checked.] and the main thread collects these in a list of lists until all
have been collected at which point all NSOperations *should* be finished.
They aren't -- even though I use a separate countdown int as the sentinel.
Each time through the whole process, one operation (not always the same one)
remains in the opQueue, and isFinishd == NO, at the point when the opQueue
is due to be filled up again. [It is almost always one of the last
operations pushed onto the opQueue.] If I then
waitUntilAllOperationsAreFinished, the program hangs forever. Apparently,
this last operation never finishes although the other 1300 operations do and
they are all the same apart from input data.
Question: In Leopard, does an NSOperationQueue send a signal of its own when
an operation is terminating, something analogous to
applicationDidFinishLaunching? Could garbage collection be postponing the
queue clearing? I could not find any function that would force clearing the
opQueue. Is there one?
BTW, I cannot use Snow Leopard for this, at least at work, because I have
only a G5.
--
Mike McLaughlin
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