错误报告从终止的进程（预期是正常的）

问题描述

我有一个测试模块来测试我的表模块。
我的表模块，当它终止时，调用这个：

I have a test module that tests my Table module.My Table module, when it terminates, calls this:

terminate(_, State = {Board, Status, Players}) ->
  gen_server:stop(Board),
  ...stopping other processes,
  io:format("Table Terminating.~p~n", [State]),
  ok.

这是我的代码中唯一会阻止 code>进程。

This is the only part of my code that would stop a Board process.

运行测试后，大约一分钟后我会得到这个：

After running my tests, I will get this after about a minute:

=ERROR REPORT==== 21-Jul-2017::22:28:40 ===
** Generic server <0.92.0> terminating
** Last message in was []
** When Server state == [[{spawn,x,none},
                          {recent,x,none},
                          {empty,null,none},
                          {empty,null,none},
                          {empty,null,none}],
                         [{empty,null,none},
                          {empty,null,none},
                          {empty,null,none},
                          {ridge,null,none},
                          {empty,null,none}],
                         [{empty,null,none},
                          {empty,null,none},
                          {ridge,null,none},
                          {empty,null,none},
                          {empty,null,none}],
                         [{empty,null,none},
                          {ridge,null,none},
                          {empty,null,none},
                          {empty,null,none},
                          {empty,null,none}],
                         [{empty,null,none},
                          {empty,null,none},
                          {empty,null,none},
                          {empty,null,none},
                          {spawn,o,none}]]
** Reason for termination ==
** {terminated,[{io,format,
                    [<0.90.0>,"Board.~p~n",
                     [[[{spawn,x,none},
                        {recent,x,none},
                        {empty,null,none},
                        {empty,null,none},
                        {empty,null,none}],
                       [{empty,null,none},
                        {empty,null,none},
                        {empty,null,none},
                        {ridge,null,none},
                        {empty,null,none}],
                       [{empty,null,none},
                        {empty,null,none},
                        {ridge,null,none},
                        {empty,null,none},
                        {empty,null,none}],
                       [{empty,null,none},
                        {ridge,null,none},
                        {empty,null,none},
                        {empty,null,none},
                        {empty,null,none}],
                       [{empty,null,none},
                        {empty,null,none},
                        {empty,null,none},
                        {empty,null,none},
                        {spawn,o,none}]]]],
                    []},
                {board,terminate,2,[{file,"board.erl"},{line,319}]},
                {gen_server,try_terminate,3,
                            [{file,"gen_server.erl"},{line,629}]},
                {gen_server,terminate,7,[{file,"gen_server.erl"},{line,795}]},
                {proc_lib,init_p_do_apply,3,
                          [{file,"proc_lib.erl"},{line,247}]}]

像 Board 模块不正确地终止。 董事会的终止是这样的：

which looks like the Board module terminated improperly. The Board's terminate is such:

terminate(normal, State) ->
    io:format("Board.~p~n", [State]),
    ok.

我试图在独立模块中复制这个内容， b ：

I tried to reproduce this in a standalone module, b:

-module(b).
-compile(export_all).

init([]) -> {ok, {1, 2}}.

terminate(_, State) ->
  io:format("Table Terminating.~p~n", [State]),
  ok.

code_change(_OldVsn, State, _Extra) ->
    {ok, State}. 

handle_cast(_, State) ->
    {noreply, State}.

handle_info(Msg, State) ->
  io:format("Unexpected message: ~p~n",[Msg]),
  {noreply, State}.

go() ->
  gen_server:start_link(?MODULE, [], []).

不成功：


4> {ok，B} = b：go（）。
{ok，< 0.74.0>}
5> gen_server：止动件（B）。
表终止{1,2}

我想知道的是，我应该寻找什么样的代码导致我的董事会得到 **终止原因==
** {终止停止的原因

What I am wondering is, what kind of code should I look for that would cause my Board to get the ** Reason for termination ==** {terminated reason for stopping?

完整的来源是：[email protected]：QuantumProductions / tunnel.git

Full source is here: [email protected]:QuantumProductions/tunnel.git

编辑：董事会包括这个

handle_call(stop, _From, State) ->
    {stop, normal, shutdown_ok, State};
handle_call(_, _, Board) ->
  {reply, {error, unrecognized, Board}, Board}.

编辑：我最好的猜测是 eunit 自动终止在其测试中创建的进程？

My best guess is eunit is automatically terminated processes created within its tests?

推荐答案

为什么 borad 是 [] ？根据您使用的代码 gen_server：stop / 1 调用 gen：stop / 1 调用 gen：stop / 3 调用，最后调用。当为gen_server调用 sys：terminate / 3 时，sys调用，它调用与 [] 作为最后的消息！

Why borad last message is []? According to the code you used gen_server:stop/1 which calls gen:stop/1 which calls gen:stop/3 which calls proc_lib:stop/3 which finally calls sys:terminate/3. When you call sys:terminate/3 for a gen_server, sys calls gen_server:system_terminate/4 and it calls gen_server:terminate/6 with [] as last message !

为什么 borad 以原因终止 {terminated，...} ？根据 io 代码， io：format / 2 最后调用，因为io进程已终止，在它成为 {terminate，...} 。

why borad terminated with reason {terminated, ...}? According to the io code, io:format/2 finally calls io:execute_request/2 and you got this because io process terminated and in here it becomes {terminated, ...}.

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