> On Dec 7, 2015, at 5:06 PM, Rick Mann <rm...@latencyzero.com> wrote: > > I don't see a good way to do this, though. I don't see any way to be sure > that all the canceled tasks canceled or completed, because I don't > necessarily get a call back to tell me each one is canceled. Any of them > could complete just before or just after I cancel (or at the same time).
If you do the work on the operation queue that the delegates are called on, there shouldn’t be race conditions like this — you’re essentially doing it single-threaded just like in the old days of NSURLConnection and runloops. Just cancel all the tasks for which you haven’t yet gotten a completion/failure callback. —Jens
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