DWORD WINAPI ThreadFunc(void* arg) {

    Sleep(100);
    PDEVICE_CONTEXT DeviceContext = (PDEVICE_CONTEXT)arg;

    QUEUE_CONTEXT * qc = (QUEUE_CONTEXT *)DeviceContext->DefaultQueue;
    while (1)
    {
        RingBufferWrite(&(qc->RingBuffer), (BYTE*)"HELLOrn", 8);
        Sleep(1000);
    }
    return 0;
}

EvtIoRead(
    _In_  WDFQUEUE          Queue,
    _In_  WDFREQUEST        Request,
    _In_  size_t            Length
    )
{
    NTSTATUS                status;
    PQUEUE_CONTEXT          queueContext = GetQueueContext(Queue);
    WDFMEMORY               memory;
    size_t                  bytesCopied = 0;

    ...

    status = RingBufferRead(&queueContext->RingBuffer,
                            (BYTE*)WdfMemoryGetBuffer(memory, NULL),
                            Length,
                            &bytesCopied);