System/Library/Frameworks/Foundation.framework

_NSOperationQueueProgress.h

NSObject
>
NSProgress

@class NSOperationQueue;

@interface _NSOperationQueueProgress : NSProgress {
    NSOperationQueue *_queue;
    struct os_unfair_lock_s { unsigned int _os_unfair_lock_opaque; } _queueLock;
}

- (void)setTotalUnitCount:(long long)a0;

@end