If, under UNIX/Linux/BSD/OSX, I use this sequence of APIs in Application A:

```
    msgq_id = mq_open(  full_queue_name,
                        O_RDWR | O_CREAT,
                        S_IRWXU | S_IRWXG,
                        &msgq_attr);
    mq_send(msgq_id, ptrData1, len1, 0);
    mq_send(msgq_id, ptrData2, len2, 0);
    ...

```

and this sequence of events in Application B:

```
    mqd_t open_res = mq_open(full_queue_name, O_RDONLY);
    ...
    mq_receive(...)
    mq_receive(...)

```

... do I have a guarantee that the message queue maintains the order of the messages?
That is, that Application B will receive the data from ptrData1 first, and then the data from ptrData2?