@class IOKMatchingNotification; @interface IOKMatchingNotificationRef : NSObject { struct os_unfair_recursive_lock_s { struct os_unfair_lock_s { unsigned int _os_unfair_lock_opaque; } ourl_lock; unsigned int ourl_count; } _lock; } @property (nonatomic) IOKMatchingNotification *notification; - (id)init; - (void)lock; - (void)unlock; @end