recordFetchedBlock concurrency

When multiple records are fetched, are the recordFetchedBlock's of CKQueryOperation executed concurrently (on multiple threads), or sequentially on 1 thread?

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yvsong
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It's always safest to assume that callbacks could be invoked on multiple concurrent queues. If you need to do work that has to be performed on a single queue, it might be best to manage a private serial queue and then you can dispatch blocks to it as your recordFetchedBlock handler is called.

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pdm
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It's always safest to assume that callbacks could be invoked on multiple concurrent queues. If you need to do work that has to be performed on a single queue, it might be best to manage a private serial queue and then you can dispatch blocks to it as your recordFetchedBlock handler is called.

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pdm
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