SILC_FSM_THREAD_WAIT(thread)

    Macro used to wait for the `thread' to terminate.  The machine or
    thread will be suspended while it is waiting for the thread to
    terminate.  The machine or thread will continue once the waited
    thread has terminated.

    The state function returns in this macro.

    This macro is the only way to safely make sure that the thread has
    terminated by the time FSM continues from the waiting state.  Using
    FSM events to signal from the thread before SILC_FSM_FINISH is returned
    works with normal FSM threads, but especially with real system threads
    it does not guarantee that the FSM won't continue before the thread has
    actually terminated.  Usually this is not a problem, but it can be a
    problem if the FSM is waiting to be freed.  In this case using this
    macro is strongly recommended.