On 10 Jun '08, at 1:27 PM, Michael Ash wrote:
If there were a synchronous API the code would have to somehow jump down the stack to where you're waiting for A, while somehow leaving the stuff that's waiting for B live farther up the stack. This is quite simply impossible in a C-based language.
It's not impossible, but it would require either that every window ran in a separate thread (as in the BeOS) or that the Cocoa frameworks supported coroutines. Coroutines are quite feasible in C, using setjmp/ longjmp style trickery; but when I investigated this I saw that using them would probably seriously confuse Objective-C's exception handling, and possibly NSRunLoop too.
John, you should look at the Cocoa conceptual docs that describe the use of sheets. There are probably a bunch of examples of sheet usage in the sample code too, if you search for "beginSheetModalForWindow:".
—Jens
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