[webkit-dev] High Resolution Timer API proposal(s)

Justin Haygood jhaygood at reaktix.com
Fri Oct 3 10:25:16 PDT 2008

I'd say define it as a minimum precision of 1ms, but browser manufacturers
can define any precision they wish.


From: webkit-dev-bounces at lists.webkit.org
[mailto:webkit-dev-bounces at lists.webkit.org] On Behalf Of Mike Belshe
Sent: Friday, October 03, 2008 1:24 PM
To: Maciej Stachowiak
Cc: webkit-dev at lists.webkit.org
Subject: Re: [webkit-dev] High Resolution Timer API proposal(s)


Another devil's advocate argument:

Let's fast-forward for a year or two, and the hires timer exists in some
form.  Do we need to offer any protections against CPU spinning?


What if one browser (say the dominant market-leading browser at the time)
implements this with timers that have a 15ms granularity?  Consumers of this
API using a 1ms timer still incur a 15ms delay.  App programmers that don't
test on browsers that do offer hi-res timers will spin the CPU.  Since these
browsers by definition are not market leaders, they'll be forced to
re-introduce the clamp on the new API, and we'll be back where we started.
Is there a way to avoid repeating history?


Or am I missing something? :-)








On Thu, Oct 2, 2008 at 8:44 PM, Maciej Stachowiak <mjs at apple.com> wrote:

On Oct 2, 2008, at 8:27 PM, Cameron McCormack wrote:

> Maciej Stachowiak:
>> I think I will mention some of these possible variations when
>> proposing the spec. At Hixie's suggestion I will propose it as a
>> standalone spec on <public-webapps at w3.org>, I recommend that those
>> who
>> wish to follow the discussion subscribe to that list.
> Hixie mentioned at one point that he'd like to see WindowTimers in a
> separate spec, I think.  Now that there is the event loop stuff in
> HTML 5 I don't know whether that's still his opinion, but if it is,
> will
> you include setInterval()/setTimeout() in this Web Apps spec?  That
> would be useful for SVG in the future.

I think it would be a good idea to include the older existing timer
APIs, yes.


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