On 8 Dec 2015, at 01:58, Rick Mann <rm...@latencyzero.com> wrote:

> Also, I presume this only works if the queue is a serial queue, but the docs 
> say it doesn't have to be such.

You really want your NSURLSession delegate queue to be a serial queue.  It's 
going to be very hard to maintain coherent state otherwise.  Moreover, your 
delegate queue work should be fast, so serialisation isn't a problem.  If you 
need to do real work in this context, that work itself should be farmed off to 
a separate thread/queue/NSOperation.

On 8 Dec 2015, at 03:52, Rick Mann <rm...@latencyzero.com> wrote:

> And, the answer is no. My completion block gets called MANY more times after 
> I invalidate and cancel the session.

I'm confused by this.  Are you looking to invalidate the session or not?  If 
you don't mind invalidating the session (-invalidateAndCancel), you should be 
able to kick off the new work your -URLSession:didBecomeInvalidWithError: 
delegate callback, which is the last callback you'll get for this session and 
which will arrive after all your task cancellation callbacks have run.

Share and Enjoy
--
Quinn "The Eskimo!"                    <http://www.apple.com/developer/>
Apple Developer Relations, Developer Technical Support, Core OS/Hardware



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