Re: [Pharo-dev] finalization

[Ben Coman]

I'm documenting what I'm learning in a format for a blog post that
might be the basis for something.

cheers -ben

On Wed, Sep 7, 2016 at 3:40 AM, stepharo  wrote:
> Ben
>
> no stress. Now what I would love is an example that we can put in the uFFI
> chapter :)
>
> Stef
>
>
> Le 6/9/16 à 17:32, Ben Coman a écrit :
>
>> Apologies.   What a bogus post!   I must have been really tripping
>>
>> On Tue, Sep 6, 2016 at 9:26 PM, Ben Coman  wrote:
>>>
>>> I thought I was starting to get a grip on how finalization work.  I
>>> made this example...
>>>
>>>  Object subclass: #MyObject
>>>  instanceVariableNames: ''
>>>  classVariableNames: ''
>>>  package: 'Play'
>>>
>>>  MyObject>>autoRelease
>>> ^ self class finalizationRegistry add: self
>>>
>>>  MyObject>>finalize
>>>  Transcript crShow: 'Finalizing MyObject'
>>>
>>>  o := MyObject new autoRelease.
>>>  o := nil.
>>>  Smalltalk garbageCollect.   ==> 'Finalizing MyObject'
>>>
>>> So far so good.  Extrapolating... I would *expect* this...
>>>
>>>  oc := OrderedCollection new.
>>>  10 timesRepeat: [ oc add: Libclang getClangVersion ].
>>>  oc removeAll.
>>>  oc := nil.
>>>  Smalltalk garbageCollect.
>>>
>>> ...to print 'Finalizing MyObject' ten times, but it does nothing!!
>>>
>> Duh! I didn't send autorelease inside the timesRepeat above...
>>
>> Duh^2 !!  that example didn't even refer to MyObject!
>>
>> Of course fixing those two things to get...
>>  10 timesRepeat: [ oc add: MyObject new autoRelease. ].
>> works perfectly!
>>
>>> Such a simple example feeds my naive presumption that the system seems
>>> broken. So could someone help me interpret this result ?
>>
>> Sorry for the noise.  Pure PIBKAM**.  Couldn't see the trees for the
>> forest.
>>
>> cheers -ben
>>
>>
>> **problem is between keyboard and mouse.
>>
>>
>
>

Re: [Pharo-dev] finalization

[stepharo]

Ben

no stress. Now what I would love is an example that we can put in the 
uFFI chapter :)


Stef


Le 6/9/16 à 17:32, Ben Coman a écrit :

Apologies.   What a bogus post!   I must have been really tripping

On Tue, Sep 6, 2016 at 9:26 PM, Ben Coman  wrote:

I thought I was starting to get a grip on how finalization work.  I
made this example...

 Object subclass: #MyObject
 instanceVariableNames: ''
 classVariableNames: ''
 package: 'Play'

 MyObject>>autoRelease
^ self class finalizationRegistry add: self

 MyObject>>finalize
 Transcript crShow: 'Finalizing MyObject'

 o := MyObject new autoRelease.
 o := nil.
 Smalltalk garbageCollect.   ==> 'Finalizing MyObject'

So far so good.  Extrapolating... I would *expect* this...

 oc := OrderedCollection new.
 10 timesRepeat: [ oc add: Libclang getClangVersion ].
 oc removeAll.
 oc := nil.
 Smalltalk garbageCollect.

...to print 'Finalizing MyObject' ten times, but it does nothing!!


Duh! I didn't send autorelease inside the timesRepeat above...

Duh^2 !!  that example didn't even refer to MyObject!

Of course fixing those two things to get...
 10 timesRepeat: [ oc add: MyObject new autoRelease. ].
works perfectly!


Such a simple example feeds my naive presumption that the system seems
broken. So could someone help me interpret this result ?

Sorry for the noise.  Pure PIBKAM**.  Couldn't see the trees for the forest.

cheers -ben


**problem is between keyboard and mouse.

Re: [Pharo-dev] finalization

[Ben Coman]

Apologies.   What a bogus post!   I must have been really tripping

On Tue, Sep 6, 2016 at 9:26 PM, Ben Coman  wrote:
> I thought I was starting to get a grip on how finalization work.  I
> made this example...
>
> Object subclass: #MyObject
> instanceVariableNames: ''
> classVariableNames: ''
> package: 'Play'
>
> MyObject>>autoRelease
>^ self class finalizationRegistry add: self
>
> MyObject>>finalize
> Transcript crShow: 'Finalizing MyObject'
>
> o := MyObject new autoRelease.
> o := nil.
> Smalltalk garbageCollect.   ==> 'Finalizing MyObject'
>
> So far so good.  Extrapolating... I would *expect* this...
>
> oc := OrderedCollection new.
> 10 timesRepeat: [ oc add: Libclang getClangVersion ].
> oc removeAll.
> oc := nil.
> Smalltalk garbageCollect.
>
> ...to print 'Finalizing MyObject' ten times, but it does nothing!!
>

Duh! I didn't send autorelease inside the timesRepeat above...

Duh^2 !!  that example didn't even refer to MyObject!

Of course fixing those two things to get...
10 timesRepeat: [ oc add: MyObject new autoRelease. ].
works perfectly!

> Such a simple example feeds my naive presumption that the system seems
> broken. So could someone help me interpret this result ?

Sorry for the noise.  Pure PIBKAM**.  Couldn't see the trees for the forest.

cheers -ben


**problem is between keyboard and mouse.