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answers:

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Q: 

[sublayer array] insertSublayer:above: atomic if superLayer stays the same?

Setting:
* two threads
* one moves layers inside sublayer-array with insertSublayer:above:
* the other accesses superlayer of the moved layer at the very same time

Question:
* is superlayer of the moved layer nil in any moment of insertSublayer:above: or below:?

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