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Thread Safety of performSelector:withObject:afterDelay:?

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Thread Safety of performSelector:withObject:afterDelay:?

Subject: Thread Safety of performSelector:withObject:afterDelay:?
From: Jim Correia <email@hidden>
Date: Wed, 23 Nov 2005 12:45:16 -0500

In the thread safety summary at

http://developer.apple.com/documentation/Cocoa/Conceptual/ Multithreading/articles/CocoaSafety.html

NSObject is listed as being thread safe. Does this mean that

-[NSObject performSelector:withObject:afterDelay:]

is also thread safe, even though the implementation surely involves the run loop, which isn't thread safe?

Is the delayed invocation scheduled on the current run loop, or the main run loop?

Finally, is there a built-in "Cocoa" way to determine if I am currently executing in the context of the main thread? Or must I write my own convenience wrapper for that test?

Thanks,
Jim


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