@class NSString; @interface _HKSPUnfairLock : NSObject <HKSPMutexProvider> { struct os_unfair_lock_s { unsigned int _os_unfair_lock_opaque; } _lock; } @property (readonly) unsigned long long hash; @property (readonly) Class superclass; @property (readonly, copy) NSString *description; @property (readonly, copy) NSString *debugDescription; - (id)init; - (void)performBlock:(id /* block */)a0; - (void)performBlockAssertingLocked:(id /* block */)a0; @end