Fwd: "delay" keyword

Brendan Eich brendan at mozilla.org
Thu Jul 5 11:20:03 PDT 2012

You do realize this works in Firefox via a *nested* event loop. Not a 
coroutine or green thread under the hood, by which other events flow in 
the outer loop?

That makes it a bug, and I am willing to bet real money no other engine 
will adopt it as a feature.


Patrik Stutz wrote:
> NICE! Exactly like I requested it :P
> I also think that this isn't a Bug. It's far to good to be a bug. Such 
> complex things (as you told me it is) like stack pausing/resuming not 
> just are there by accident.
> It would be really interesting to know what the guys of the V8-Engine 
> think about this.
> 2012/7/5 Jussi Kalliokoski <jussi.kalliokoski at gmail.com 
> <mailto:jussi.kalliokoski at gmail.com>>
>     On Thu, Jul 5, 2012 at 8:50 PM, Brendan Eich <brendan at mozilla.org
>     <mailto:brendan at mozilla.org>> wrote:
>         Jussi Kalliokoski wrote:
>             Ok, here's the relevant blog post I mentioned writing:
>             blog.avd.io/posts/js-green-threads
>             <http://blog.avd.io/posts/js-green-threads>
>             <http://blog.avd.io/posts/js-green-threads> . You can
>             discuss / give feedback here or on HackerNews:
>             http://news.ycombinator.com/item?id=4203749 .
>         Seems like a bug in Firefox, a violation of HTML5 even. The
>         slow script dialog should not allow an event loop to nest.
>         Cc'ing Boris for his opinion (this may be a known bug on file,
>         my memory dims with age).
>     I don't think it's a bug, it seems to meaningful since all the
>     blocking calls have this behaviour. Looks like SM has stack
>     pausing / continuing in place as well; why, if not for this? Seems
>     reasonable to me. But if it's a bug, I'm extremely sorry I haven't
>     filed it, I didn't think it was a bug when I discovered it around Fx8.
>         Chrome doesn't run onmessage when I continue ("Wait") the
>         Kill-or-Wait sad tab dialog. Safari and Opera (12) seem not to
>         put up a slow script dialog, but perhaps I was impatient (I
>         wanted a minute or so).
>     Yes, this is Firefox-specific. I've tested all other browsers at
>     my disposal and they don't have this behavior. Seems like a good
>     idea adding it though, could make the browsers a lot more
>     responsive regardless of a few bad websites, and I don't think
>     those websites would break horribly because of this.
>     Cheers,
>     Jussi
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