title: What's the difference between an exclusive lock and a shared lock?
body: <p>According to wikipedia:</p>
  <blockquote>
  <p>Shared locks are sometimes called &quot;read locks&quot; and exclusive locks are sometimes called &quot;write locks&quot;.</p>
  </blockquote>
  <p>Can you explain the reasoning behind the terms &quot;shared&quot; and &quot;exclusive&quot;?</p>