objc_property_unsafe_readwrites

@interface SomeClass : NSObject

@property (nonatomic, strong) NSString *someProperty;

@end

@implementation SomeClass

+ (void)load {
    [self new];
}

- (instancetype)init {
    self = [super init];
    
    if (self) {
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0ul), ^{
            NSLog(@"%@", [NSThread currentThread]);
            while (true) {
                @autoreleasepool {
                    self.someProperty = [[NSProcessInfo processInfo] globallyUniqueString];
                }
            }
        });
        
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0ul), ^{
            NSLog(@"%@", [NSThread currentThread]);
            while (true) {
                @autoreleasepool {
                    NSString __unused *something = [self getPropertyOrHoopla];
                }
            }
        });
    }
    
    return self;
}

- (NSString *)getPropertyOrHoopla {
    return self.someProperty ?: @"hoopla";
}

@end