Interpreter change

[Andreas Raab]

Hi John -

> What I'd suggest here is setting a aioPollNeed flag
> 
> have forceaioPoll() that does
>     set the aioPollNeed flag
>     calls forceInterruptCheck()
> 
> in checkForInterrupts()
> check aioPollNeed, if true call aioPoll() and reset.

What for? We can just call ioProcessInterrupts() no matter what. If you 
really need to have extra tests for aio you can implement them in the 
support code, e.g.,

ioProcessInterrupts() {
   if(aioPollNeeded) aioPoll();
}

and leave the main VM without further modifications (I really dislike 
adding such unnecessary extensions to the VM itself - it's up to the 
support code to behave as stated, and if the stated behavior is to get 
out quickly, well, then the support code should just comply).

Cheers,
   - Andreas