Re: [Help-smalltalk] OOP leaking with registered object

[Roland Plüss]

On 04/05/2015 01:38 PM, Holger Hans Peter Freyther wrote:
> On Sun, Apr 05, 2015 at 12:16:36AM +0200, Roland Plüss wrote:
>
>> What you mean with shuting down all processes? As far as I know GST
>> knows only one process: the main process. When I'm outside the main
>> process should it not be the case that each call to gst_perform or
>> similar is conclusive, hence finishing up? So how would a finalization
>> listener work once you exit again the byte code? Similar how would
>> saving a snapshot work? There you have to also save the image and
>> somehow "exit" back into C++ land to shut down. Am I missing here something?
> I am referring to Smalltalk processes that continue to run. With
> spawning the "gst" application you have:
>
> st> Process allInstancesDo: [:each | each printNl]
> Process(nil at highIOPriority, terminated)
> Process('finalization listener' at timingPriority, waiting on a semaphore)
> Process('idle' at idlePriority, ready to run)
> Process('delay process' at timingPriority, waiting on a semaphore)
>
> So these processes run, they refer to objects. Now I don't know
> how many objects you want to be collected but you need to give up
> references and you need to make sure the finalization listener is
> woken up and runs
>
>
> 'finalization listener' process:
>
>
>     initialize [
>         ...
>
>         finalizerProcess :=
>                 [[gcSemaphore wait.  self startFinalizers] repeat]
>                         forkAt: Processor timingPriority.
>         ...
>     ]
>
>
>     startFinalizers [
>         "Private - Fire a low-priority process to finalize the objects"
>         <category: 'idle tasks'>
>         | local localFinalizerProcess |
>         local := gcArray.
>         gcArray := nil.
>
>         localFinalizerProcess := [:array | array do: [:each | each mourn]]
>                     newProcessWith: {local}.
>         localFinalizerProcess priority: Processor userSchedulingPriority.
>         localFinalizerProcess name: 'finalization worker'.
>         localFinalizerProcess resume
>     ]
>
So I need to run this 'finalization listener' process somehow and this
cleans up? How would I trigger this from C++? And as a follow up
question would it not be better to just call a full garbage collection
run? After all there is only supposed to be one application object
holding all the script sources one way or the other. I drop the
reference of this one at exit time so a garbage collector run should
clean all up properly. How can I run such a fill garbage collection from
C++?

-- 
Mit freundlichen Grüssen
Plüss Roland

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