title: error: cannot open source file of some headers
body: <p>i am trying to run  a phtread program in visual studio 2010.</p>
  
  <p>in this code there is "sys/times.h", " sys/time.h" and file unistd.h.</p>
  
  <p>i face errors which listed as follow :</p>
  
  <ul>
  <li>canot open source file sys/times.h</li>
  <li>canot open source file sys/time.h</li>
  <li>canot open source file unistd.h</li>
  </ul>
  
  <p>can any body tell me is it possible to use this include file in windows visual studio??? if yes where can i find them???if not and they cant be used in windows visual studio what is the equivalent of this headers?????</p>
  
  <p>thanks</p>