Modules function in Erlang -

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so, here part of module i'm writing:

request(pid, listofdocuments) when is_pid(pid), is_list(listofdocuments) -> io:format("we here~n"), case whereis(jdw_api) of     undefined -> [no, api];     apipid when is_pid(apipid) ->         io:format("... , here~n"),         % (1) won't work: spawn(?module, loop, [pid, listofdocuments])         % (2) won't work, either: ?module:loop(pid, listofdocuments)         loop(pid, listofdocuments) % (3) , neither this... end.

... , this:

loop(pid, docs) when is_list(docs), length(docs) > 0 -> h = hd(docs), t = tl(docs), io:format("... not here...~w~n", h), case ?mode of     sync ->         ref = make_ref(),         jdw_api ! {self(), ref, doc, h},         ans = loop_sync(ref, [], []),         pid ! ans,         loop(pid, t);     async -> {error, 'async mode not implemented yet', ?file, ?line};     _ -> {'?mode must either async or sync'} end; loop(pid, docs) -> io:format("done document list").

... reason, "loop" function never gets called. neither of 3 different ways makes magic happen... pointers?

your loop function might called, code show above 1 clause of function, , run if called pid , non-empty list of documents. other problem buggy call io:format("... not here...~w~n", h) should io:format("... not here...~w~n", [h]). call might crashing loop code. without more source work , example arguments request/2 it's hard tell.


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