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// TNLSafeOperation
// NULL and nil are equivalent here, doesn't matter, of course.
// but in objective-c self.completionHandler = nil; is more appropriate
//  [super setCompletionBlock:nil];
- (void)tnl_clearCompletionBlock
{
    [super setCompletionBlock:NULL];
}

        NSProcessInfo *processInfo = [NSProcessInfo processInfo];

        __auto_type processInfo = [NSProcessInfo processInfo];

NSString * const TNLBackgroundRequestOperationDidCompleteNotification = @"TNLBackgroundRequestOperationDidCompleteNotification";
NSString * const TNLBackgroundRequestURLRequestKey = @"URLRequest";
NSString * const TNLBackgroundRequestResponseKey = @"response";
NSString * const TNLBackgroundRequestURLSessionConfigurationIdentifierKey = @"identifier";
NSString * const TNLBackgroundRequestURLSessionTaskIdentifierKey = @"taskIdentifier";
NSString * const TNLBackgroundRequestURLSessionSharedContainerIdentifierKey = @"sharedContainerIdentifier";

@interface TNLBackgroundRequest__Keys : NSObject
+ (NSString *)OperationDidCompleteNotification;
+ (NSString *)URLRequestKey;
+ (NSString *)ResponseKey;
+ (NSString *)URLSessionConfigurationIdentifierKey;
+ (NSString *)URLSessionTaskIdentifierKey;
+ (NSString *)URLSessionSharedContainerIdentifierKey;
@end

static dispatch_queue_t _URLSessionTaskOperationPropertyQueue(void);
static dispatch_queue_t _URLSessionTaskOperationPropertyQueue()
{
    static dispatch_queue_t sQueue;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sQueue = dispatch_queue_create("TNLRequestOperation.URLSessionTaskOperation.atomic.queue", DISPATCH_QUEUE_CONCURRENT);
    });
    return sQueue;
}