List Erlang:为列表中的每个元素循环一个函数
我有一个calls.txt:List Erlang:为列表中的每个元素循环一个函数,list,loops,recursion,concurrency,erlang,List,Loops,Recursion,Concurrency,Erlang,我有一个calls.txt: {john, [jill,joe,bob]}. {jill, [bob,joe,bob]}. {sue, [jill,jill,jill,bob,jill]}. {bob, [john]}. {joe, [sue]}. 我想通过Receiver1循环,并为Receiver1中的每个元素调用spawner()函数。但是,当我在控制台中调用read()时,什么也没有发生。请帮忙 这是我的密码: read() -> {ok, [List1, Li
{john, [jill,joe,bob]}.
{jill, [bob,joe,bob]}.
{sue, [jill,jill,jill,bob,jill]}.
{bob, [john]}.
{joe, [sue]}.
我想通过Receiver1循环,并为Receiver1中的每个元素调用spawner()函数。但是,当我在控制台中调用read()时,什么也没有发生。请帮忙
这是我的密码:
read() ->
{ok, [List1, List2, List3, List4, List5]} =
file:consult("calls.txt"),
{Sender1, Receiver1} = List1,
{Sender2, Receiver2} = List2,
{Sender3, Receiver3} = List3,
{Sender4, Receiver4} = List4,
{Sender5, Receiver5} = List5,
[spawner(Sender1,H) || H <- Receiver1].
spawner(Sname,Rname) ->
Sender = spawn(calling,intercept,[]),
Sender ! {self(), {Sname,Rname}},
get_feedback().
get_feedback() ->
receive
{Msg} ->
io:fwrite(Msg)
end.
read()->
{好的,[List1,List2,List3,List4,List5]}=
文件:consult(“calls.txt”),
{Sender1,Receiver1}=List1,
{Sender2,Receiver2}=List2,
{Sender3,Receiver3}=List3,
{Sender4,Receiver4}=List4,
{Sender5,Receiver5}=List5,
[产卵器(发送器1,H)| H
Sender=spawn(调用、截获、[]),
发送者!{self(),{Sname,Rname},
获取反馈()。
获取反馈()->
接收
{Msg}->
io:fwrite(Msg)
结束。
get\u feedback()
在主/原始进程中执行。仅仅因为调用get\u feedback()
发生在调用spawn()
之后,并不意味着get\u feedback()
在派生进程中执行。在派生进程中执行的唯一事情是函数调用:intercept()
因此,您最终会向衍生进程发送消息,然后在调用get\u feedback()
时在主进程中输入一个receive
——这意味着主进程等待衍生进程的消息,但衍生进程不发送任何消息(或者至少您还没有显示生成的进程向主进程发送消息的任何代码)
如果在函数调用:intercept()
中调用get\u feedback()
,则get\u feedback()
将在派生进程中执行,并且接收将尝试将主进程发送的消息与派生进程相匹配
此外,如果出于某种原因,接收与消息不匹配,并且您认为应该这样做,那么请按照以下方式重写接收:
receive
Msg -> io:format("~w~n", [Msg])
end
该接收将匹配任何消息,然后您可以检查输出以确定实际接收不匹配的原因
或者,您可以让intercept()
将消息发送回主进程,然后get\u feedback()
可以在主进程中接收消息:
-module(my).
-compile(export_all).
read() ->
{ok, Pairs} = file:consult("calls.txt"),
[spawner(Sender, Receivers) || {Sender, Receivers} <- Pairs].
spawner(Sender, Receivers) ->
io:format("~w, ~w~n", [Sender, Receivers]),
Pid = spawn(my, intercept, []),
io:format("The main process is: ~w.~n", [self()]),
io:format(
"The newly spawned process where intercept() is executing is: ~w~n",
[Pid]
),
Pid ! {self(), {Sender, Receivers} },
get_feedback().
intercept() ->
receive
{From, Pair} ->
io:format("intercept() received message: ~w, from: ~w~n", [Pair, From]),
From ! {self(), "hello"}
end.
get_feedback() ->
receive
{From, Msg} ->
io:format("Main process received message: ~p, from: ~w~n", [Msg, From])
end.
-模块(my)。
-编译(全部导出)。
read()->
{ok,Pairs}=file:consult(“calls.txt”),
[产卵器(发送者,接收者)|{发送者,接收者}
io:格式(“~w,~w~n”,[Sender,Receivers]),
Pid=spawn(my,intercept,[]),和,
io:format(“主进程是:~w.~n”,[self()]),
io:格式(
“执行intercept()的新生成的进程是:~w~n”,
[Pid]
),
Pid!{self(),{Sender,Receivers},
获取反馈()。
截取()->
接收
{From,Pair}->
io:format(“intercept()接收到的消息:~w,from:~w~n,[Pair,from]),
来自!{self(),“hello”}
结束。
获取反馈()->
接收
{From,Msg}->
io:format(“主进程收到消息:~p,发件人:~w~n,[Msg,发件人])
结束。
在外壳中:
18> c(my).
my.erl:2: Warning: export_all flag enabled - all functions will be exported
{ok,my}
19> my:read().
john, [jill,joe,bob]
The main process is: <0.64.0>.
The newly spawned process where intercept() is executing is: <0.168.0>
intercept() received message: {john,[jill,joe,bob]}, from: <0.64.0>
Main process received message: "hello", from: <0.168.0>
jill, [bob,joe,bob]
The main process is: <0.64.0>.
The newly spawned process where intercept() is executing is: <0.169.0>
intercept() received message: {jill,[bob,joe,bob]}, from: <0.64.0>
Main process received message: "hello", from: <0.169.0>
sue, [jill,jill,jill,bob,jill]
The main process is: <0.64.0>.
The newly spawned process where intercept() is executing is: <0.170.0>
intercept() received message: {sue,[jill,jill,jill,bob,jill]}, from: <0.64.0>
Main process received message: "hello", from: <0.170.0>
bob, [john]
The main process is: <0.64.0>.
The newly spawned process where intercept() is executing is: <0.171.0>
intercept() received message: {bob,[john]}, from: <0.64.0>
Main process received message: "hello", from: <0.171.0>
joe, [sue]
The main process is: <0.64.0>.
The newly spawned process where intercept() is executing is: <0.172.0>
intercept() received message: {joe,[sue]}, from: <0.64.0>
Main process received message: "hello", from: <0.172.0>
[ok,ok,ok,ok,ok]
18>c(我的)。
my.erl:2:警告:已启用导出\u所有标志-将导出所有功能
{好的,我的}
19> 我的:read()。
约翰[吉尔,乔,鲍勃]
主要流程是:。
正在执行intercept()的新生成的进程是:
intercept()收到消息:{john,[jill,joe,bob]},来自:
主进程收到消息:“你好”,来自:
吉尔,[鲍勃,乔,鲍勃]
主要流程是:。
正在执行intercept()的新生成的进程是:
intercept()收到消息:{jill,[bob,joe,bob]},来自:
主进程收到消息:“你好”,来自:
苏,[吉尔,吉尔,吉尔,鲍勃,吉尔]
主要流程是:。
正在执行intercept()的新生成的进程是:
intercept()收到消息:{sue,[jill,jill,jill,bob,jill]},来自:
主进程收到消息:“你好”,来自:
鲍勃[约翰]
主要流程是:。
正在执行intercept()的新生成的进程是:
intercept()收到消息:{bob,[john]},来自:
主进程收到消息:“你好”,来自:
乔[苏]
主要流程是:。
正在执行intercept()的新生成的进程是:
intercept()收到消息:{joe,[sue]},来自:
主进程收到消息:“你好”,来自:
[好,好,好,好,好]