title: Asynchronous ReadDirectoryChangesW()?
body: <p>I want to monitor the modifications in a specified directory, and retrieve the exact change information. So I've decided to use the <a href="http://msdn.microsoft.com/en-us/library/aa365465(VS.85).aspx" rel="nofollow noreferrer">ReadDirectoryChangesW()</a> function. But I want to use it asynchronously, which means I don't want my worker thread to be blocked if there are no changes in the directory.</p>
  <p>How can I do this?</p>