On Sep 15, 2008, at 5:18 PM, Quincey Morris wrote:
On Sep 15, 2008, at 14:35, Ken Thomases wrote:
It's possible that it's not safe to release a NSOperation until
after it returns YES to [NSOperation isFinished].
I don't think there needs to be anything specific in the
documentation. In the absence of a documented exception, we should
assume it follows the usual Cocoa memory management conventions.
That is, if you need to continue to access the NSOperation, you
need to hold ownership of it. If you don't care about accessing it
in the future, you need not. The NSOperationQueue is expected to
do whatever is necessary for it to carry out its responsibilities.
If it needs to retain the NSOperation objects, and we can guess
that it probably does need that, it will. You, as a client,
shouldn't care though.
The question is not really about what NSOperationQueue does, but
whether it's safe to release a NSOperation while it's executing. If
not (as seems likely), then even if you don't otherwise care about
accessing it in the future, you must not release it until
'isFinished' returns YES.
I think you mean "whether it's safe to _deallocate_ an NSOperation
while it's executing". But again, Cocoa's memory management
conventions don't put that onus on you, the client. If it's not safe,
then it's the responsibility of either NSOperation or NSOperationQueue
to protect against it, not yours. Your only responsibility is to
express the period over which you need the object to stick around for
your purposes.
If the client were to bear such responsibility, then _that_ would be
an exception to the conventions, and that would have to be
documented. In the absence of such documentation, the assumption is
that the client doesn't bear that responsibility.
Regards,
Ken
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