On Sat, 03 Jun 2006 21:34:20 +0200, David T. Lewis <lewis at mail.msen.com>  
wrote:

> On Sat, Jun 03, 2006 at 08:32:26PM +0200, Bruno Luca wrote:
>> On Sat, 03 Jun 2006 15:27:32 +0200, David T. Lewis <lewis at mail.msen.com>
>> wrote:
>>
>> >On Sat, Jun 03, 2006 at 01:06:30PM +0200, Bruno Luca wrote:
>> >The #signalSemaphoreWithIndex: method provides a general way to signal
>> >a semaphore in the Squeak image from the VM. It works on any platform,
>> >including of course Windows. This provides a very nice mechanism for
>> >a Process in Squeak "wake up" when some external event happens.
>>
>> I didn't try any implementation yet, but i guess i need a threaded loop  
>> to
>> check when a Semaphore has been signaled, right?
>
> Yes. For an example, look at InputSensor>>installInterruptWatcher.
> This starts a Smalltalk Process (aka thread) that wakes up when you
> hit the interrupt key. The VM watches for you to hit the interrupt
> key, then calls #signalSemaphoreWithIndex: to activate the interrupt
> watcher process. The interrupt watch process just waits quietly in
> the background until somebody wakes it up, then it takes over and
> tries to interrupt whatever Process was running at the time you
> hit the interrupt key.
>

Yes i've took a look at InputSensor.

> I assume that you have already loaded VMMaker into your image.
> If not, load it from SqueakMap and you'll be able to see all the
> code that makes this work. Also, if you open a ProcessBrowser
> (from the "Tools" tab) you will see several processes that run
> in the background and rely on semaphore signals to wake up and
> do their respective jobs.
>
> Dave
>

Thanks :)

-- 
www.lethalman.net - Thoughts about computer technologies