performSelector:onThread: when the target thread is blocked

Yes, I'm being lazy.

What happens when I call performSelector:onThread:... and pass in a thread that's currently blocked (on synchronous I/O, for instance)? Does the s开发者_如何学JAVAelector just get queued to be executed later?

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Yep. I'm pretty sure it gets added to the thread's runloop so it will be performed on the next iteration.