RESOLVED FIXED 224543
AudioSourceProviderAVFObjC uses atomic variables but also locks with mutex 
https://bugs.webkit.org/show_bug.cgi?id=224543
Summary AudioSourceProviderAVFObjC uses atomic variables but also locks with mutex
Kimmo Kinnunen
Reported 2021-04-14 05:58:35 PDT
AudioSourceProviderAVFObjC uses atomic variables but also locks with mutex This makes it hard to understand the code, as the atomic usage seems to be purposeless.
Attachments
Patch (4.73 KB, patch)
2021-04-14 06:00 PDT, Kimmo Kinnunen 		no flags
DetailsFormatted DiffDiff
View All Add attachment proposed patch, testcase, etc.
Kimmo Kinnunen
Comment 1 2021-04-14 06:00:49 PDT
Created attachment 425975 [details] Patch
Alexey Proskuryakov
Comment 2 2021-04-15 15:45:27 PDT
Comment on attachment 425975 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=425975&action=review > Source/WebCore/platform/graphics/avfoundation/AudioSourceProviderAVFObjC.mm:378 > + m_writeAheadCount = m_tapDescription->mSampleRate * earlyBy.toDouble(); I looked here as an example, and I don't see any mutex serializing the access.
Kimmo Kinnunen
Comment 3 2021-04-15 22:14:47 PDT
Comment on attachment 425975 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=425975&action=review >> Source/WebCore/platform/graphics/avfoundation/AudioSourceProviderAVFObjC.mm:378 >> + m_writeAheadCount = m_tapDescription->mSampleRate * earlyBy.toDouble(); > > I looked here as an example, and I don't see any mutex serializing the access. Taken up there in the caller, processCallback.
EWS
Comment 4 2021-04-20 04:38:45 PDT
Committed r276301 (236783@main): <https://commits.webkit.org/236783@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 425975 [details].
Ling Ho
Comment 5 2021-04-23 02:52:02 PDT
rdar://76893260
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