gistfile1.m

- (void)updateGalleryAndVideos:(void(^)(void))block
{    
    __unsafe_unretained NUData* wself = self;
    dispatch_queue_t caller = dispatch_get_current_queue();
    
    dispatch_async(queue, ^{
        
        if (_updatingManufacturerResults) return;
    
        _updatingManufacturerResults = YES;
        
        [wself _updateGalleryAndVideos:block caller:caller];
        
        _updatingManufacturerResults = NO;
    });
}