[webkit-dev] JSC framework API proposal: setting a handler for enqueuing tasks

Maciej Stachowiak mjs at apple.com
Mon Jul 6 16:44:43 PDT 2015

Should JS be defining an event loop abstraction that WebCore then uses? That would be weird, because the required behavior of the even loop in web content is chock full of issues that are not at all related to JavaScript. JSC doesn't even know enough to run microtasks at all the right times (from reading the spec it seems that way, at least) for the Web case. Or are you saying it would have a fallback runloop for non-Web contents?


> On Jul 6, 2015, at 3:24 PM, Geoffrey Garen <ggaren at apple.com> wrote:
> I think it would be better for JavaScriptCore to handle micro tasks natively.
> It’s not so great for each client to need to reinvent the microtask runloop abstraction.
> Geoff
>> On Jul 6, 2015, at 10:05 AM, Yusuke SUZUKI <utatane.tea at gmail.com <mailto:utatane.tea at gmail.com>> wrote:
>> Hi WebKittens,
>> I've landed the update of the ES6 Promise implementation.
>> Through this work, I've experimentally added the internal private function, @enqueueJob(JS function, JS array for arguments).
>> This is corresponding to the ES6 spec EnqueueJob[1].
>> This EnqueueJob handler is now tightly integrated with WebCore's microtask infrastructure. So in JSC framework side, we cannot use this function.
>> As a result, current JSC framework disables Promise because there's no event loop abstraction.
>> So I propose the API configuring euqueueJob handler into JSC VM (That corresponds to the Realm in ECMA spec).
>> Like,
>> void JSContextGroupSetEnqueueJobCallback(JSContextGroupRef, JSEnqueueJobCallback, void* callbackData);
>> What do you think about this?
>> [1]: http://ecma-international.org/ecma-262/6.0/#sec-enqueuejob <http://ecma-international.org/ecma-262/6.0/#sec-enqueuejob>
>> Best Regards,
>> Yusuke Suzuki
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