I share Rick's worry about weak maps. It's not clear how to make an
efficient GC in the presence of weak maps.
As Brendan rightly points out there is already a lot of complexity in
the GC of a typical JS implementation because it is interacting with
the (typically) reference counted, C++ based
On Oct 29, 2010, at 12:08 AM, Erik Corry wrote:
One of the hallmarks of a real language implementation vs. a 'toy
scripting language' ala PHP is a good GC. I'd really like to see
someone do a low-latency GC with weak maps before we hobble the
language with something that can't be implemented
2010/10/29 Brendan Eich bren...@mozilla.com:
On Oct 29, 2010, at 12:08 AM, Erik Corry wrote:
One of the hallmarks of a real language implementation vs. a 'toy
scripting language' ala PHP is a good GC. I'd really like to see
someone do a low-latency GC with weak maps before we hobble the
Rick and Erik,
I share your concerns about the importance of efficient GC for JavaScript.
However, based upon direct experience, I'm not particularly concerned about the
impact of Weak maps. The ES Harmony Weak Maps is derived from the Ephemeron
concept first developed at Digitalk. We first
On 2010-10-28, at 17:10, Hudson, Rick wrote:
GC implementation
Software stacks on multicores will need GCs to become increasingly concurrent
and latency free. Weak maps cause concurrent GCs and additional mutator
synchronizations. While a concurrent GC already has to do some
On Oct 29, 2010, at 3:57 AM, Erik Corry wrote:
2010/10/29 Brendan Eich bren...@mozilla.com:
On Oct 29, 2010, at 12:08 AM, Erik Corry wrote:
One of the hallmarks of a real language implementation vs. a 'toy
scripting language' ala PHP is a good GC. I'd really like to see
someone do a
On Oct 29, 2010, at 12:08 AM, Erik Corry wrote:
Let's be careful not to add things to the language that will limit
implementations from getting the sorts of modern GC implementations
that Java and .NET have.
Yet don't Java and .NET have weak-keyed maps of some sort?
/be
On 10/29/10 10:51, Brendan Eich wrote:
On Oct 29, 2010, at 12:08 AM, Erik Corry wrote:
Let's be careful not to add things to the language that will limit
implementations from getting the sorts of modern GC implementations
that Java and .NET have.
Yet don't Java and .NET have weak-keyed maps
-Original Message-
From: es-discuss-boun...@mozilla.org [mailto:es-discuss-
boun...@mozilla.org] On Behalf Of felix
Sent: Friday, October 29, 2010 12:18 PM
To: Brendan Eich
...
Yet don't Java and .NET have weak-keyed maps of some sort?
Java has WeakHashMap, which is a map of
Oops, typo fixed below
-Original Message-
From: es-discuss-boun...@mozilla.org [mailto:es-discuss-
boun...@mozilla.org] On Behalf Of Allen Wirfs-Brock
Sent: Friday, October 29, 2010 12:24 PM
To: felix; Brendan Eich
Cc: Andreas Gal; es-discuss
Subject: RE: Concerns about weak refs
-discuss-boun...@mozilla.org] On
Behalf Of Allen Wirfs-Brock
Sent: Friday, October 29, 2010 3:04 PM
To: Allen Wirfs-Brock; felix; Brendan Eich
Cc: Andreas Gal; es-discuss
Subject: RE: Concerns about weak refs and weak maps.
Oops, typo fixed below
-Original Message-
From: es-discuss-boun
On 10/29/10 15:18, Jim Deville wrote:
C# 4.0 has WeakMap's too, and one of the goals was to work around the cyclical
reference issue:
http://blogs.msdn.com/b/clrteam/archive/2009/05/18/the-conditional-weak-table-enabling-dynamic-object-properties.aspx
mono implements ConditionalWeakTable
On Oct 29, 2010, at 4:01 PM, felix wrote:
On 10/29/10 15:18, Jim Deville wrote:
C# 4.0 has WeakMap's too, and one of the goals was to work around the
cyclical reference issue:
On Oct 28, 2010, at 2:10 PM, Hudson, Rick wrote:
I have concerns about weak refs and weak maps, one concern related to
usability, one related to performance bugs, and another other related to
changing the complexity of the GC algorithm.
Hi Rick, your comments are on target, but I'll differ
: Brendan Eich [mailto:bren...@mozilla.com]
Sent: Thursday, October 28, 2010 2:39 PM
To: Hudson, Rick
Cc: es-discuss; Andreas Gal
Subject: Re: Concerns about weak refs and weak maps.
On Oct 28, 2010, at 2:10 PM, Hudson, Rick wrote:
I have concerns about weak refs and weak maps, one concern related
On Oct 28, 2010, at 5:41 PM, Hudson, Rick wrote:
Hi Brendan,
I think we all agree that EcmaScript, the language, should not contain
threads with shared memory constructs such as locks or transactions. We seem
to disagree as to whether EcmaScript, the implementation, should be
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