title: How to create queue and start it manually
body: <p>In my application, I have to implement a refresh token logic. I would like that during the refresh token process all requests sent to be kept in a queue and as soon as my process is finished, I start the queue</p>
  
  <p>For example, I want something like this:</p>
  
  <pre><code>let queue = DispatchQueue(label: "myQueue", attributes: .concurrent)  
  
  queue.async {
      // request One
  }
  
  queue.async {
      // request Two
  }
  </code></pre>
  
  <p>And when the refresh token process finished:</p>
  
  <pre><code>queue.send()
  </code></pre>