Foreign Event Sources

[David Chisnall]

Hi,

I have been looking at the NSRunLoop class and its helpers and the  
documentation is a little bit spotty in places.  There are three cases  
I have come across recently:

1) Wanting to handle X11 events in an NSRunLoop
2) Wanting to handle events coming from a file descriptor.
3) Wanting to handle events coming from an external (C) library's  
runloop implementation.

The first of these seems like it ought to be possible, since the X11  
backends turn X11 events into NSEvents and so I ought to be able to  
wrap the others up.

The second ought to be efficient since there appears to be logic for  
using select or similar to see if there is data waiting from elsewhere.

The third ought to be possible by either spawning another thread using  
the foreign API's blocking mode and pass events into the main runloop,  
although this doesn't seem particularly efficient and so can't be used  
for things that require low latency, such as audio processing.

Is any of this documented somewhere?

David