Function isInvalid

include/RemotePlugin.h:547–554

	message receiveMessage();

	inline bool isInvalid() const
	{
#ifdef SYNC_WITH_SHM_FIFO
		return m_in->isInvalid() || m_out->isInvalid();
#else
		return m_invalid;
#endif
	}

	message waitForMessage( const message & _m,
						bool _busy_waiting = false );