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name instead. (e.g., SLOCK instead of SMTX, TD_ON_LOCK() instead of TD_ON_MUTEX()) Eventually a turnstile abstraction will be added that will be shared with mutexes and other types of locks. SLOCK/TDI_LOCK will be used internally by the turnstile code and will not be specific to mutexes. Making the change now ensures that turnstiles can be dropped in at a later date without affecting the ABI of userland applications.