SilcBool
    silc_client_private_message_wait_init(SilcClient client,
                                          SilcClientConnection conn,
                                          SilcClientEntry client_entry);

    Initializes private message waiting functionality for the client
    indicated by `client_entry'.  Once this is called private message
    from remote connection indicated by `conn' for `client_entry' may
    be waiter for, for example in a thread.  The function
    silc_client_private_message_wait is used to block the current thread
    until a private message is received from a specified client entry.
    Return FALSE in case an internal error occurred.