[release/10.0] Revert "Use a ReaderWriterLockSlim in RcwCache"#120372
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agocke merged 1 commit intorelease/10.0from Oct 6, 2025
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[release/10.0] Revert "Use a ReaderWriterLockSlim in RcwCache"#120372agocke merged 1 commit intorelease/10.0from
agocke merged 1 commit intorelease/10.0from
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This reverts commit a074813.
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Backport of #120370 to release/10.0
/cc @AaronRobinsonMSFT
Customer Impact
This results in a random crash for scenarios involving
ComWrappers. Reported by partner teams in #119986and #120347.
Regression
This was regressed in #117792, which was an attempt to address a performance regression reported in #120347. At this point it has also become apparent that this approach didn't address the performance regression and instead uses the stronger guarantee of a simple lock.
Testing
This is resetting the functionality back to the known good implementation of using a simple lock.
Risk
Low from a functionality perspective, but Med from a risk perspective. However, the Med risk is narrowly impacting
ComWrapperscenarios (for example, WinRT).