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Exact semantics of NSThread executation states?
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Exact semantics of NSThread executation states?


  • Subject: Exact semantics of NSThread executation states?
  • From: Sean McBride <email@hidden>
  • Date: Tue, 12 Jul 2016 17:52:58 -0400
  • Organization: Rogue Research Inc.

Hi all,

NSThread has at least 3 execution state properties: executing, finished, cancelled.  Alas, the docs don't say much about what they mean beyond circular definitions like "A Boolean value that indicates whether the receiver is executing".

I have code where I create an NSThread, add a runloop source, then invoke "start" on the thread.  I have assumed that once I invoke "start" that "isExecuting" should give YES.  Literally:

	[myThread start];
	assert([myThread isExecuting]);

On 10.11.5 and earlier this *seems* to always be true, but on 10.12b2 it's not.  I'm trying to understand if my assumption was wrong or if it's an OS bug.

Thanks,

--
____________________________________________________________
Sean McBride, B. Eng                 email@hidden
Rogue Research                        www.rogue-research.com
Mac Software Developer              Montréal, Québec, Canada



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