listener_start/3

Starts a thread listening for input from a binary input stream

listener_start(+Stream, +Callback, -Listener)

listener_start/3 starts a thread listening for input from a a binary input stream Stream. The input has to be send with the predicate send/2. When a input term has been read, the callback predicate Callback will be called. If the first argument of Callback is a variable, then it is replaced by the term, that has been read. If the second argument of Callback is a variable then it will be replaced by the listener object.

Arguments

Stream             binary input stream
Callback           compound or atom
Listener           object

Examples

main(_) :-
    server_start(1352, 3, accept_connection(_), _).

accept_connection(Socket) :-
    open(Socket, read, Input, [socket,buffered,binary]),
    open(Socket, write, Output, [socket,buffered,binary]),
    listener_start(Input, handle_request(_, _, Input, Output), _).

handle_request(logoff, Listener, Input, Output) :- !,
    close(Input),
    close(Output),
    listener_stop(Listener).
handle_request(Request, Listener, Input, Output) :-
    ...

See also