RESOLVED FIXED 235353
[meta] Perform media networking operation off the main thread 
https://bugs.webkit.org/show_bug.cgi?id=235353
Summary [meta] Perform media networking operation off the main thread
Jean-Yves Avenard [:jya]
Reported 2022-01-19 04:09:49 PST
When playing multiple CRABS videos we can end up with a deadlock between the main thread and the CoreMedia player. Currently data coming via PlatformMediaResourceLoader/PlatformMediaResourceClient comes on the main thread. When we have a sync call from the content process to the GPU Process to query status of the CoreMedia player this last one could be waiting for data to arrive on the main process. As the data will never come with the main thread blocked ; we end up in a deadlock. This can be checked with this page: https://webkit.apple.com/demos/bin/video/many-video-elements.html Steps to reproduce: 1. Load <https://webkit.apple.com/demos/bin/video/many-video-elements.html> in Safari 2. Tap the “50” button to create 50 media elements 3. Playback will stall with < 50 elements successfully created By moving the networking operations off the main thread, we could avoid a deadlock.
Attachments
WIP1 (8.76 KB, patch)
2022-01-19 04:21 PST, Jean-Yves Avenard [:jya] 		no flags
DetailsFormatted DiffDiff
WIP2 (59.05 KB, patch)
2022-01-20 06:01 PST, Jean-Yves Avenard [:jya] 		ews-feeder: commit-queue-
DetailsFormatted DiffDiff
WIP3 (85.73 KB, patch)
2022-01-24 06:46 PST, Jean-Yves Avenard [:jya] 		ews-feeder: commit-queue-
DetailsFormatted DiffDiff
WIP3 (85.91 KB, patch)
2022-01-24 07:22 PST, Jean-Yves Avenard [:jya] 		ews-feeder: commit-queue-
DetailsFormatted DiffDiff
WIP4 (93.85 KB, patch)
2022-01-25 00:30 PST, Jean-Yves Avenard [:jya] 		ews-feeder: commit-queue-
DetailsFormatted DiffDiff
WIP4 (94.59 KB, patch)
2022-01-25 06:17 PST, Jean-Yves Avenard [:jya] 		ews-feeder: commit-queue-
DetailsFormatted DiffDiff
WIP6 (95.34 KB, patch)
2022-01-30 20:13 PST, Jean-Yves Avenard [:jya] 		ews-feeder: commit-queue-
DetailsFormatted DiffDiff
WIP6 (92.65 KB, patch)
2022-01-31 00:07 PST, Jean-Yves Avenard [:jya] 		ews-feeder: commit-queue-
DetailsFormatted DiffDiff
Show Obsolete (3) View All Add attachment proposed patch, testcase, etc.
Jean-Yves Avenard [:jya]
Comment 1 2022-01-19 04:10:13 PST
rdar://84517825
Jean-Yves Avenard [:jya]
Comment 2 2022-01-19 04:21:28 PST
Created attachment 449473 [details] WIP1
Jean-Yves Avenard [:jya]
Comment 3 2022-01-20 06:01:04 PST
Created attachment 449568 [details] WIP2
Jean-Yves Avenard [:jya]
Comment 4 2022-01-24 06:46:12 PST
Created attachment 449809 [details] WIP3
Jean-Yves Avenard [:jya]
Comment 5 2022-01-24 07:22:35 PST
Created attachment 449811 [details] WIP3
Jean-Yves Avenard [:jya]
Comment 6 2022-01-25 00:30:40 PST
Created attachment 449903 [details] WIP4
Jean-Yves Avenard [:jya]
Comment 7 2022-01-25 06:17:33 PST
Created attachment 449924 [details] WIP4
Jean-Yves Avenard [:jya]
Comment 8 2022-01-30 20:13:53 PST
Created attachment 450374 [details] WIP6 Fix crashes related to use of AtomString in ResourceResponse
Jean-Yves Avenard [:jya]
Comment 9 2022-01-31 00:07:20 PST
Created attachment 450386 [details] WIP6 Fix crashes when GPU->WebContent connection is closed
Jean-Yves Avenard [:jya]
Comment 10 2022-05-18 05:22:56 PDT
Pull request: https://github.com/WebKit/WebKit/pull/719
EWS
Comment 11 2022-05-28 06:27:31 PDT
Committed r294999 (251097@main): <https://commits.webkit.org/251097@main> Reviewed commits have been landed. Closing PR #719 and removing active labels.
Ryan Haddad
Comment 12 2022-05-31 16:36:30 PDT
This change was reverted in https://commits.webkit.org/251166@main because it introduced https://bugs.webkit.org/show_bug.cgi?id=241159
Jean-Yves Avenard [:jya]
Comment 13 2024-01-24 02:29:07 PST
Pull request: https://github.com/WebKit/WebKit/pull/23156
EWS
Comment 14 2024-01-30 19:33:04 PST
Committed 273804@main (75bfd79c190e): <https://commits.webkit.org/273804@main> Reviewed commits have been landed. Closing PR #23156 and removing active labels.
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