Does AMQ C++ Client (CMS) support multi-thread to ack message?

Issue

• I am using OpenWire CMS client with CLIENT_ACK mode to acknowledge the message. I followed the official example . But since I need multi-thread processing, the default way of message acknowledge is a serial way, which means the thread could not acknowledge new messages if previous messages are not consumed. I need a parallel way to increate the application thoroughptut.
• My sample code is as below:

void* sendAckThreadFunc(void *pMessage) {
    sleep(1);
    const Message* message = (const Message*) pMessage;
    message->acknowledge();
    printf("ACK sent out.");        
    return NULL;
}

 virtual void onMessage(const Message* message) {
        static int count = 0;
        try {
            count++;
            const TextMessage* textMessage = dynamic_cast<const TextMessage*>(message);
            string text = "";
            if (textMessage != NULL) {
                text = textMessage->getText();
            } else {
                text = "NOT A TEXTMESSAGE!";
            }
            if (clientAck) {          
                //message->acknowledge();  
        pthread_t sendAckThread; 
              //instead of ack the message in the onMessage function, use pthread_create to generate a new thread to ack the message
           if (pthread_create(&sendAckThread, NULL, sendAckThreadFunc,(void*) message)) {
        printf("Error occured when create threads.");
        }
            }

            printf("A Message #%d Received: %s\n", count, text.c_str());
        } catch (CMSException& e) {
            e.printStackTrace();
        }
    }

When running the consumer, we found the consumer application failed with below messages:

Segmentation fault (core dumped) 

and messages are not consumed.