Bug 260478

Summary: [WPE][GTK] Enable requestIdleCallback
Product: WebKit Reporter: Michael Catanzaro <mcatanzaro>
Component: WebKitGTKAssignee: Nobody <webkit-unassigned>
Status: NEW ---    
Severity: Normal CC: bugs-noreply, rniwa
Priority: P2    
Version: WebKit Nightly Build   
Hardware: PC   
OS: Linux   
See Also: https://bugs.webkit.org/show_bug.cgi?id=164193

Description Michael Catanzaro 2023-08-21 12:26:49 PDT 
We need to enable requestIdleCallback, as in bug #260369. Ryosuke has left us this hint:

"""
You need to implement these functions: RunLoopObserver::schedule, RunLoopObserver::invalidate, and RunLoopObserver::isScheduled():

https://github.com/WebKit/WebKit/blob/main/Source/WebCore/platform/RunLoopObserver.cpp
"""

Unfortunately, looking at RunLoopObserverCF, I can't think of any way to map this to GMainContext, so it's probably not possible. We shouldn't try to modify GMainContext unless there are no other options. This requires further investigation.

--------------------------------------------

We should also think about the problem I describe here: https://bugs.webkit.org/show_bug.cgi?id=164193#c18, i.e. we need to make sure web content cannot perform a denial of service that would prevent WebKit from running WebKit's own callbacks.
Comment 1 Ryosuke Niwa 2023-08-21 14:01:22 PDT 
FWIW, the feature may work out of box right now because of the code I added to WindowEventLoop:
https://github.com/WebKit/WebKit/blob/main/Source/WebCore/dom/WindowEventLoop.cpp#L189

Might be worth testing to see if you can enable the feature anyway without implementing RunLoopObserver.