@class NSMutableDictionary; @interface ACDKeychainLock : NSObject { struct os_unfair_lock_s { unsigned int _os_unfair_lock_opaque; } _containerLock; NSMutableDictionary *_locksByServiceUsername; } - (id)init; - (void)lockPerformForService:(id)a0 username:(id)a1 block:(id /* block */)a2; - (void).cxx_destruct; @end