On Jun 10, 2008, at 3:17 AM, Graham Cox wrote:
though out of curiosity I wonder if there is a way to do this "cooperatively" on the main thread without having to break up the loop doing the actual work. For example, in Carbon one can run the event loop for a short period or just for one event on each cycle of the loop - and this code can live in the progress dialog controller, so it works transparently with respect to the loop that drives the progress indicator. I'm not sure that approach is considered "good" in this day and age though I used it a lot on Mac OS 6/7/8/9. Just wondered if such an approach is feasible in Cocoa.
Yes, you can do that. You would typically use a NSTimer to repeatedly schedule small pieces of work to be performed on the main thread. You wouldn't have to use a modal session to do this - It is certainly not a requirement to lock out the user while processing data.
That said - No, it is not considered to be a good approach. It's almost impossible to implement it in such a way that it doesn't affect the user experience. It's typically much better, and more "future safe", to invest your time in a multi-threaded implementation.
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