Add MemoryBarrier to SyncBlock Lock upgrade path#121355

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jkoritzinsky merged 8 commits intodotnet:mainfrom

jkoritzinsky:monitor-fix-testing

Nov 10, 2025

Commits on Nov 5, 2025

Try putting a memory barrier before the thin lock clearing to ensure that other threads observe the swapped-in and initialized lock before the thin-lock value is cleared.
jkoritzinsky
committed

Commits on Nov 7, 2025

Remove the timeout from the thin->thick lock upgrade spinlock. We might get a GC on the thread that owns the lock, so spinning for a while makes sense.
jkoritzinsky
committed
Remove MP_LOCKS (never defined in vm)
jkoritzinsky
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PR feedback
jkoritzinsky
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