>
> Besides, signalling the event semaphore from the VM will only work if  
> you
> have a multi-threaded VM implementation which can process incoming UI  
> events
> in parallel to the VM's loop. If you don't, then you'll only get new  
> events
> every 500ms or so (depending on what your VM interrupt check counter  
> says)
> so not stimulating the input semaphore is not an option given all the
> non-multithreaded implementations.

Well yes the mac os-x VM is a muti-threaded VM that has a separate  
thread for the UI events. That's
part of the carbon/cocoa event model. In fact the UI thread uses  
pthread locking to deposit events onto the
Squeak VM thread.

What I've done as a first pass is create a message to replace the  
inputSemaphore signal, that way one can
check out doing a Delay waitFor 1 millisecond to see how that affects  
cpu load.

As a subclass I've created a EventSensorVMDriven class which does  
nothing for the inputSemphoreSignal method, and relies on the  
mutli-threaded event driven VM to signal the semaphore when events  
actually are constructed and placed on the VM event queue. As part of  
the EventSensor install command I install the correct class based on  
the OS type and version information.

This seems to work fine. Others are welcome to try it and give feedback  
on how it feels or if there are issues.
Certainly I would like to hear about issue on multi-cpu macintoshes.

Please ensure the global Sensor is the right class after you've filed  
in and installed the changes.

Technically I can move towards this model on OS-9 too because it's  
pseudo -threaded underneath, but the signal inputSemaphore has been  
commented out for many years...


  --
======================================================================== 
===
John M. McIntosh <johnmci at smalltalkconsulting.com> 1-800-477-2659
Corporate Smalltalk Consulting Ltd.  http://www.smalltalkconsulting.com
======================================================================== 
===
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