Weak references and destructors

Charles Jolley charles at sproutit.com
Thu Dec 10 10:11:08 PST 2009


That looks pretty much right on.  Thanks Tom!  Can anyone give any insight as to how likely it is this might actually happen?  

-C

On Dec 10, 2009, at 10:03 AM, Tom Van Cutsem wrote:

> Hi,
> 
> I think what you are looking for is this:
> http://wiki.ecmascript.org/doku.php?id=strawman:weak_references
> 
> Cheers,
> Tom
> 
> On Thu, Dec 10, 2009 at 9:44 AM, Charles Jolley <charles at sproutit.com> wrote:
> Hi,
> 
> I was wondering if any thought has gone into adding weak references and destructors to Harmony.
> 
> We are finding that as we build large, long running JS apps, it is very hard to keep memory under control using the built-in GC since any reference - even for caching - will prevent the memory from being reclaimed.
> 
> If we had a way to keep weak references for caches, the GC could reclaim a lot more of our memory automatically.  If a destructor were called before an object was dealloc'ed, we could clean up caches and tear down additional references, possibly allowing further memory to be reclaimed as well.
> 
> Of course I can implement something like explicit reference counting in existing ES engines to get around this but then we lose many of the benefits of automated GC.
> 
> -Charles
> 
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