A Shared lock Cost the Same as a Private One at One Thread, and Not at Two
On .NET 10.0.12 a shared lock matched a per-thread lock at one thread and cost more from two up, where Monitor.LockContentionCount left zero.
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#concurrency
clrstack Shows the Waiter and syncblk Names the Lock Holder
In a dotnet-dump of a contested lock, clrstack -all marked no thread as the owner. syncblk named it, and a suspended await appeared only in dumpasync.
