@interface PXAsyncOperation : NSOperation { struct os_unfair_lock_s { unsigned int _os_unfair_lock_opaque; } _stateLock; int _operationState; } @property (readonly, nonatomic) BOOL px_shouldWaitForCancel; - (BOOL)isExecuting; - (id)init; - (void)start; - (BOOL)isFinished; - (BOOL)isAsynchronous; - (void)cancel; - (void)px_finishIfPossible; - (void)px_start; @end