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[NSApp runModalSession] from Carbon app

I have a carbon app that should bring up a modal cocoa window. The app is multithreaded, with some of the threads being cooperative.

To bring up the modal window, I originally called [NSApp runModalForWindow], but I noted that this would not allow my cooperative thread to run. I therefore tried [NSApp runModalSession], e.g. as follows:

CocoaDialog* controller = [[ConvolutionDialog alloc] initWithNib:@"Convolution"];
NSModalSession session = [NSApp beginModalSessionForWindow: [controller window]];

while (1)
{ if ([NSApp runModalSession:session] != NSRunContinuesResponse)
break;
YieldToAnyThread();
}
[NSApp endModalSession:session];

[controller release];

I was hoping that runModalSession would return to the loop whenever it had nothing to do (according to the documentation, as far as I understood it, it should do that) so I can call YieldToAnyThread, giving my cooperative threads an opportunity to execute. However, I note that runModalSession returns only when the window is dismissed, and therefore I don't get the opportunity to call YieldToAnyThread.

Any advice what I am doing wrong here? Does runModalSession work as designed, or is this a bug? Any other way for achieving what I am trying to do?

TIA

Kurt Sutter

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