title: POSIX message queue - Does it still exists after reboot?
body: <p>On linux, wrote a simple program to create a POSIX message queue, and send a msg to it, after the process terminated, it seems the msg is still there.</p>
  
  <p><strong>The questions are:</strong></p>
  
  <ul>
  <li>Does the msg still there after reboot?</li>
  <li>If it exists, then it's on disk, how did it guarantee the performance if it stores msg on disk instead of memory.</li>
  </ul>