John,

> Unfortunately we can't just remove it because older mac VM, mmm even 
> the current Mac VM does not trigger the event sensor semaphore.

Neither does the Windows VM and it doesn't matter the least bit. Just
trust me :-) Take out the #waitTimeoutMSecs call from ioProcess and
replace it with #wait and you'll see that the system is chugging along
just happily.

> This was based on a note from you way back... (see below)

The note specifically says "do whatever you like" in a synchronous
environment. It only matters in an async environment where you *must*
signal the input semaphore.

> Hence  my 
> comment about have some way to query the VM to see if it has true 
> async event support, then adjust things.

Just try it. It works. And rightly so.

Cheers,
  - Andreas