Question: Two level (or two factor) locks briefly try a spin lock and then if the lock is not acquired quickly, suspend the thread like a

Two level (or two factor) locks briefly try a spin lock and then if the lock is not acquired quickly, suspend the thread like a semaphore (or some mutex locks).

When is a two factor lock useful?

What would you want to know before trying to set the bounds on how long (now many iterations spinning) such a lock should try before suspending itself?

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