The biggest problem I've had in 
   addressing embedding issues is the 
   inability to implement a robust 
   callback facility.  I would love to see 
   a sound embeddable, perhaps reentrant, 
   version of the VM.

Another approach would be to have the two sides
run in separate threads and communicate via a simple
message queue facility.  They can still exchange
pointers efficiently, but their calling conventions
and stacks don't have to mesh.  You can still give
the user the illusion of callbacks.

If preemption is a problem, you can either use system
threads and turn off preemption, or you can use SGI's
state thread library.

Tom.


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