parallel queue1: {
  stage ('queue 1') {
    println "queue1a"
    sleep 30
    println "queue1b"
  }
}, queue2: {
  stage ('queue2') {
    println "queue1"

    ServerSocket listener = new ServerSocket(4444)
//    listener.setSoTimeout(30);

    if (listener.isClosed()) {
      echo "not open"
    } else {
      echo "open"
    }

    println "processing new connection... a"
    Socket socket = listener.accept() // blocking function call
    println "processing new connection... b"
}