title: Creating an Asynchronous Serial queue in ios
body: <p>I need to create a queue that executes asynchronously, but the order in which the tasks execute must be serial</p>
  
  <pre><code>dispatch_queue_t queue;
  queue = dispatch_queue_create("com.test.app", NULL); //create a serial queue can either be null or DISPATCH_QUEUE_SERIAL
  
  dispatch_async(queue,
                  ^{
  
                  //Mycode for doing background http
  
                  }
  </code></pre>