只能生成一个由函数初始化的进程
train/2
. 您提供的代码不完整,所以我只能猜测,但我认为您的代码是错误的,因为您只有一个列车过程。灵感来源:
-module(trains).
-export([startTrains/0]).
startTrains() ->
TotalDist = 100,
Names = [trainA,trainB ],
Self = self(),
Trains = [spawn_link(fun() ->
train(Name, Self) end) || Name <- Names],
[ Train ! {start, Self, 0, TotalDist} || Train <- Trains],
ok = collectResults(Names).
collectResults([]) -> ok;
collectResults(Trains) ->
receive
{stop, Name, Pos, Length} ->
io:format("~p stops at ~p (~p)~n", [Name, Pos, Length]),
collectResults(Trains -- [Name]);
Msg ->
io:format("Supervisor received unexpected message ~p~n", [Msg]),
collectResults(Trains)
after 10500 -> timeout
end.
train(Name, Sup) ->
receive
{start, Sup, Pos, Length} -> run_train(Name, Sup, Pos, Length);
Msg ->
io:format("~p received unexpected message ~p~n", [Name, Msg]),
train(Name, Sup)
end.
run_train(Name, Sup, Pos, Length)
when Pos < Length ->
receive after 500 ->
NewPos = Pos + 5,
io:format("~p ~p~n", [Name, Pos]),
run_train(Name, Sup, NewPos, Length)
end;
run_train(Name, Sup, Pos, Length) ->
Sup ! {stop, Name, Pos, Length}.
但如果我认真考虑的话,我应该
gen_fsm
以及OTP原则。但在你目前的阶段,继续与二郎原始人玩,以获得更好的感觉第一。