in swift if a long running throwing function is called from the main thread will I be blocking my UI? Or do throwing functions occur asynchronously automatically? Just wondering if I should dispatch it off the main thread or if that will be redundant.
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a throwing function is not different from any other function. – njzk2 May 19 '16 at 22:11
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The function will run on which ever queue you call it on. If it is a long running function as you say I would suggest firing it off on a background queue so that you don't risk it tying up your main queue.
If you would like more background info (pun intended) checkout Objc.IO article Concurrency APIs on OS X and iOS
This diagram is from the article and quite useful for visualizing queues.
Peter Hornsby
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