Bug 256073

Summary:	RemoteImageBufferProxyFlushState::waitForDidFlushOnSecondaryThread blocks on a task running on the main thread.
Product:	WebKit	Reporter:	Matt Woodrow <mattwoodrow>
Component:	Layout and Rendering	Assignee:	Matt Woodrow <mattwoodrow>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	bfulgham, commit-queue, simon.fraser, webkit-bug-importer, zalan
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified
Bug Depends on:	256210
Bug Blocks:	256694, 256779

Description Matt Woodrow 2023-04-27 21:30:42 PDT

We attempt to wait for flushes of RemoteImageBufferProxy on a background thread, but the 'didFlush' IPC message is received on the main thread.

This can mean it gets delayed (and we don't know the flush is completed) if the main thread is otherwise busy. This delays first-paint on CPLT.

Comment 1 Radar WebKit Bug Importer 2023-04-27 21:31:00 PDT

<rdar://problem/108642579>

Comment 2 Matt Woodrow 2023-04-27 21:43:56 PDT

Pull request: https://github.com/WebKit/WebKit/pull/13261

Comment 3 EWS 2023-05-01 23:39:07 PDT

Committed 263572@main (4d14bfb53b47): <https://commits.webkit.org/263572@main>

Reviewed commits have been landed. Closing PR #13261 and removing active labels.

Comment 4 WebKit Commit Bot 2023-05-02 09:51:21 PDT

Re-opened since this is blocked by bug 256210

Comment 5 Matt Woodrow 2023-05-09 13:53:26 PDT

Pull request: https://github.com/WebKit/WebKit/pull/13653

Comment 6 EWS 2023-05-11 17:03:36 PDT

Committed 263993@main (d2f31696424a): <https://commits.webkit.org/263993@main>

Reviewed commits have been landed. Closing PR #13653 and removing active labels.