Method DoCopy

util/thread/lfqueue.h:143–169

            PrevFirst = nullptr;
        }
        void DoCopy(TListNode* ptr) {
            TListNode* newFirst = ptr;
            TListNode* newCopy = nullptr;
            TListNode* newTail = nullptr;
            while (ptr) {
                if (ptr == PrevFirst) {
                    // short cut, we have copied this part already
                    Tail->Next.store(newCopy, std::memory_order_release);
                    newCopy = Copy;
                    Copy = nullptr; // do not destroy prev try
                    if (!newTail) {
                        newTail = Tail; // tried to invert same list
                    }
                    break;
                }
                TListNode* newElem = new TListNode(ptr->Data, newCopy);
                newCopy = newElem;
                ptr = ptr->Next.load(std::memory_order_acquire);
                if (!newTail) {
                    newTail = newElem;
                }
            }
            EraseList(Copy); // copy was useless
            Copy = newCopy;
            PrevFirst = newFirst;
            Tail = newTail;
        }
    };

    void EnqueueImpl(TListNode* head, TListNode* tail) {