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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_635hgm49f0nkm5so1h9fc06m7f, 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 />
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<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 />
sclass PingSource {
  // returns true if it slept
  settable volatile IF0<Bool> action;
  
  ThreadPool threadPool;
  
  *() {}
  *(ThreadPool *threadPool) {}

  // returns true if it slept
  final bool get() {
    var a = action;
    ret a != null && a!;
  }
  
  void cancel {
    action = new Cancelled;
  }
  
  class Cancelled is IF0<Bool> {
    public Bool get() { throw new PingSourceCancelledException(PingSource.this); }
  }
}