On Dec 10, 2009, at 10:11 AM, Charles Jolley wrote:
That looks pretty much right on. Thanks Tom! Can anyone give any
insight as to how likely it is this might actually happen?
You want me to lay odds? ;-)
It might help to read these wiki pages, in this order:
http://wiki.ecmascript.org/doku.php?id=harmony:harmony
http://wiki.ecmascript.org/doku.php?id=harmony:proposals
http://wiki.ecmascript.org/doku.php?id=strawman:strawman
According to Goals 1(II) "libraries (possibly including the DOM)
shared by those applications" and 1(III) "code generators targeting
the new edition", weak references are pretty important.
I think we'll get some kind of weak reference / ephemeron support in
for the next edition, but we need to hash out details of what's
normative and what's implementation-dependent, and finalize things to
the point where implementors can take the chance to invest in
prototyping.
/be
-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
<[email protected]> 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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