private void notifyError(Exception cause)
{
try {
long currentState = Interlocked.Read(ref state);
if (currentState == CLOSING)
{
if (Interlocked.CompareExchange(ref state, CLOSED, currentState) == currentState)
{
listener.OnClose(1000, "");
}
}
else if (currentState != CLOSED)
{
if (Interlocked.CompareExchange(ref state, CLOSED, currentState) == currentState)
{
listener.OnError(cause);
}
}
} catch (Exception) {
// discard exceptions thrown by the listener
}
return;
}