2016 SOS_RWLock

Ewald Cress continues his series on internals, and looks at how SOS_RWLock has changed in SQL Server 2016:

Allow me to call out some layout comparison points against the 2014 version:

  • There is no separate member to track the shared reader count.

  • The four-byte spinlock is gone.

  • The four-byte waiting writer count is gone.

  • The two chunks of four-byte padding (for qword alignment of pointers) are gone.

  • The WaitListEntry structure hasn’t changed at all.

Ewald also covers Compare-And-Swap operations in detail.  Definitely a good read.

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