How to quit basicsumemessage when a quit signal coming ?

[tms2003]

Hi,
I write a thread for processing rmq message.I use BaseConsumeMessage to waiting some message,my code like this:

AmqpClient::Channel::ptr_t channel = AmqpClient::Channel::Create(_serverUrl, _port, _userName, _password);

    

    channel->DeclareQueue(this->_rmq_queque, false, true, false, false);

    std::string consumer_tag = channel->BasicConsume(this->_rmq_queque, "");
    while (1)
    {
        std::cout << "[y] wait for the message" << std::endl;

        AmqpClient::Envelope::ptr_t envelope =
            channel->BasicConsumeMessage(consumer_tag);

        std::string buffer = envelope->Message()->Body();
       
        std::cout << "[y] receve " << buffer << std::endl;

  
       //quit the cyc when the quit var set true by main thread,
      //*******************  but ,it can't execute because waiting message
        if (quit)
        {

            cout << "amq cmd rec  thread over!" << endl;
            break;
        }
    }

    channel->BasicCancel(consumer_tag);

but ,I want to quit this thread when a signal send by main thread. but the BaseConsumeMessage blocking for waiting rmq message and can't processed any other code ,so,how can solve it ?