SILC_FSM_EVENT_WAIT(event)

    Macro used to wait for the `event' to be signalled.  The machine
    or thread will be suspended while it is waiting for the event.
    This macro can only be used in FSM state functions.  When the
    event is signalled the FSM will re-enter the current state (or
    state that was set with silc_fsm_next before waiting).

    // Signalling example
    ctx->async_event = silc_fsm_event_alloc(fsm);
    ...

    SILC_FSM_STATE(silc_foo_state)
    {
      ...

      // Wait here for async call to complete
      SILC_FSM_EVENT_WAIT(ctx->async_event);

      // Async call completed
      if (ctx->async_success == FALSE)
        fatal(error);
      ...
    }