Weak Reference proposal

[John Lenz]

The finalizer holdings, could itself could hold a reference to the
weakrefernce correct?

On Fri, Feb 19, 2016 at 12:30 AM, Dean Tribble <tribble at e-dean.com> wrote:

> Thanks for your comments.
>
> A practical answer to your question:  If you drop references to a
> subsystem that internally uses weak references, the "finalization" it would
> engage is just death throes. For example, if you drop an Xml parser, then
> there's no reason to muck out it's internal cache since that's going to be
> collected anyway. Thus, this variant is more expressive.
>
> It also breaks the retention properties of the system. In order to require
> the executor to run, *something *has to point at it (and the holdings)
> strongly. Otherwise for example the holdings and executor might not be
> retained (and you couldn't run finalization). You can end up with cycles of
> executors pointing at each other's targets such that neither can ever be
> collected because the system is keeping them around strongly.
>
> On Thu, Feb 18, 2016 at 10:42 PM, John Lenz <concavelenz at gmail.com> wrote:
>
>> This seems like a very solid proposal.  I like that the finalizers run on
>> their own turn (it had to be that way in retrospect).
>>
>> I'm unclear about one thing: the reasoning for not running finalizers
>> when weak-references them become unreferenced.  Did I misunderstand this?
>> Doesn't this force he "hard" reference to also a soft reference "weak
>> reference" to insure that finalizer run (such as closing a file, etc)?  If
>> aren't concerned about non-memory resources is there any point to having
>> holding at all?
>>
>>
>>
>> On Sun, Feb 14, 2016 at 11:35 PM, Dean Tribble <tribble at e-dean.com>
>> wrote:
>>
>>> I have posted a stage 1 proposal for weak references in ES7 for your
>>> perusal and feedback.
>>>
>>> https://github.com/tc39/proposal-weakrefs.git
>>>
>>> Thanks to Mark Miller and the authors of earlier proposals for help with
>>> the document and content!  Finally thanks to a few intrepid early reviewers
>>> for their edits, comments, and feedback.
>>>
>>> _______________________________________________
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>>>
>>>
>>
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>
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