[squeak-dev] EventSensor wait2ms (Re: [ANN] Croquet OpenGL on Squeaksource)

John M McIntosh johnmci at smalltalkconsulting.com
Tue Mar 23 17:50:14 UTC 2010

When the *high priority* task looking at the mouse location in the Browser see the cursor move between the browser windows it would change the cursor. Then invoke a tight loop to see when the cursor reentered a browser pane. This would drive 100,000 peekPosition  starving the regular morphic loop.  The result was that at the time the cursor would *stick* between browser panes if your timing was *just* right. 

It would appear that all that code was refactored in the last 5 years. Still if you feel that looking at the mouse position 100,000 a second is worthwhile? 
you could rip it all out and hope there aren't side-effects.  Like someone launch a process, then peek for mouse up. Wonder who will get the CPU? The task doing the work? Or the hyper processing spin 100,000 peeks a second waiting for the mouse to go up? 

"Change Set:		EventSensorDelayOnHyperPolling
Date:			7 November 2005
Author:			johnmci at smalltalkconsulting.com

Attempt to ensure polling for event data does not drive cpu to 100%. Wait 2ms between looks at mouse position or for keyboard events. Usually these don't happen 100's of times per second anyways"!

On 2010-03-23, at 9:16 AM, Igor Stasenko wrote:

> On 23 March 2010 18:10, Andreas Raab <andreas.raab at gmx.de> wrote:
>> On 3/23/2010 4:46 AM, Bert Freudenberg wrote:
>>> Neat :) Works like a charm on my old MacBook Pro, about 400 fps.
>> Yeah, I was wondering why it's so much slower in trunk than in our internal
>> images or Croquet. First I thought it's the JIT but then I looked at a
>> profile and found EventSensor>>wait2ms called from several places in
>> EventSensor and indirectly via Sensor anyButtonPressed .
>> WTF? This isn't in any of the images I've ever used, does someone know why
>> we're doing this? Randomly waiting for 2ms and *no comment* as to what the
>> purpose of that wait might be? I'm in favor of ripping this out; there
>> should be absolutely no need to wait for 2ms in EventSensor.
> All senders of wait2ms seems having same author , and very small time frame:
> JMM 11/7/2005 14:39
> So, i suppose we could ask the author to comment this.
>> Cheers,
>>  - Andreas
> -- 
> Best regards,
> Igor Stasenko AKA sig.

John M. McIntosh <johnmci at smalltalkconsulting.com>   Twitter:  squeaker68882
Corporate Smalltalk Consulting Ltd.  http://www.smalltalkconsulting.com

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