<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Times New Roman; font-size: 12pt; color: #000000'>You can use gen_fsm:reply/2 to explicitly send the reply back to the caller of gen_fsm:sync_send_event/2. But note then the State/3 functions must not return a reply value which the behaviour automatically send back to the client, it must just return {next_state,...}. But then the gen_fsm:sync_send_event call will wait!<br><br>Robert<br><br><hr id="zwchr"><blockquote style="border-left:2px solid rgb(16, 16, 255);margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;">Hello everybody,<br><br>I have two files, main.erl which control a finite state machine (FSM) with a gen_fsm behavior.<br>The FSM is also able to received incoming data from a socket for certain state (using the handle_info method).<br>
<br>The question is how the main program can wait and know the next state after handle_info callback is done by the gen_fsm....<br>because, according to the rawdata received the system move to another state and main.erl must know this new state to send specifics events....<br>
<br>Maybe more easy to understand with a small illustration<br><br>main.erl<br> {ok, FSMPid} = myfsm:start_link(...),<br> ok = gen_fsm:sync_send_event(FSMPid, event1) <br> % => will move the FSM to state_5 where we are waiting socket incoming data<br>
% these data will be handle by "handle_info({tcp, _Socket, RawData}, state_5, StateData)"<br> % depending on the received socket rawdata, we will change the state of the FSM <br>
<br> <br> => How can I wait handle_info has finished ?<br> => How can I get the state ?<br>
(for this last question, I think I can just send a
send_all_state(FSMPid, current_state) for example and return the
StateName<br>
<br> program will continue like this:<br> case StateName of<br> state_13 -> send another event<br> ....<br><br><br> <br> <br><br>thanks for help,<br><br>Arnaud<br> <br> <br><br> <br><br>
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