[NSThread isMainThread] is probably not what you want!
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does it have the semantics of running on the main thread though? Will calling UI state behave appropriately?
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yeah, because it's the same queue (so access to resources is still serial)
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not necessarily true - even if it runs serially w.r.t. main thread, there's main thread state.
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Do you mean there could be thread-local storage associated with the main thread? Yes, but That’s Bad™.
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Yes and that's how lots of the UI stuff works (e.g., [NSGraphicsContext currentContext]).
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I would imagine that UIKit is smart/new enough to use queue-specific data instead. /cc
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