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<?
//Mutex functions
function Lock($lockName,$seconds)
{
  $sql = "SELECT GET_LOCK('$lockName', $seconds);";
  $res = mysql_query($sql);
  if (!$res)
  {
    die('Could not query:' . mysql_error());
  }
  return mysql_result($res,0);
}

function IsLocked($lockName)
{
  $sql = "SELECT IS_FREE_LOCK('$lockName');";
  $res = mysql_query($sql);
  if (!$res)
  {
    die('Could not query:' . mysql_error());
  }
  return mysql_result($res,0);
}

function ReleaseLock($lockName)
{
  $sql = "SELECT RELEASE_LOCK('$lockName');";
  $res = mysql_query($sql);
  if (!$res)
  {
    die('Could not query:' . mysql_error());
  }
  return mysql_result($res,0);
}
//End of mutex functions
?>