[Webkit-unassigned] [Bug 164193] Implement requestIdleCallback

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=164193

--- Comment #13 from Michael Catanzaro <mcatanzaro at gnome.org> ---
> Only problem could be if a secondary thread is doing something that will imminently cause a task to post to the main thread.

Actually, it's also possible that higher-priority timeouts are already scheduled on the main thread that might be about to post. That could be detected automatically by implementing a rule that idles do not dispatch if a timeout is scheduled within the next n milliseconds. But if we set n too high then we could accidentally denial of service every idle callback, so not sure it's a good idea, probably again not part of the minimal viable solution. I'm inclined to ignore all of this and schedule the idle callbacks whenever there is no other non-idle priority source to be dispatched on the current run loop iteration. Simple is often best; if it doesn't work well in practice, then we can deal with added complexity later on.

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