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Re-entrancy, Thread-safety, Cocoa, and 1.4.1

Steve Klingsporn <email@hidden> wrote:
I hope that as part of all this, Cocoa becomes a little more
thread-safe.

I doubt it will. The problem you describe will happen in a Objective-C application, too. Pretty much every GUI framework is like that: Carbon, Cocoa, and Swing. UI updates are done in one thread. Otherwise, locks would have to be used for every UI call, which would have a horrible impact on performance. Instead, it is up to you to make sure the update happens on the main thread. For swing, you'd use SwingUtilities.invokeLater().

In Objective-C, you'd solve this problem by using performSelectorOnMainThread, which is declared on NSObject (and therefore available in pretty much every object). If there isn't a Cocoa-Java equivalent, I'd file a request for one. It is a very handy feature to have, though only available on 10.2.

(I'm using it for the exact situation you describe, updating an NSTextView with data received from a network thread.)

--
__________________________________________________________________________
"They that can give up essential liberty
Mark J. Lilback to obtain a little temporary safety
<email@hidden> deserve neither liberty or safety."
http://www.lilback.com/ -- Benjamin Franklin
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