<br />
<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_gau9j7572dn5a40h5k5oao74mu, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
<br />
<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
static class LockedVar<A> implements IVar<A> {
  A v; // you can access this directly if you use one thread
  transient Lock lock = lock();
  
  *() {}
  *(A *v) {}
  
  public void set(A a) {
    lock lock;
    v = a;
  }
  
  public A get() { lock lock; ret v; }
  public bool has() { lock lock; ret v != null; }
  public void clear() { lock lock; v = null; }
  
  toString { ret str(get()); }
}