[erlang-questions] X gen_server also died when monitored Y gen_server died. why?

[I Gusti Ngurah Oka Prinarjaya]

Hi,

Solved!. Yes i run a X supervisor process, run a X gen_server process as
adjoining process / sibling process with X supervisor process.
Then under X supervisor i add / run P1, P2, P3 gen_server process, and each
process under X supervisor is monitored by X gen_server process.
and it works!

Thank you


Pada tanggal Sen, 3 Jun 2019 pukul 19.06 I Gusti Ngurah Oka Prinarjaya <
okaprinarjaya@REDACTED> menulis:

> Hi,
>
> It's ok.. i will try another way. i think it must be under a supervisor.
>
> Thank you
>
> Pada tanggal Sen, 3 Jun 2019 15.52, Alin Popa <alin.popa@REDACTED>
> menulis:
>
>> Looks like since you're doing the stop through the gen_server:call,
>> you'll need to return {stop, Reason, Reply, State}, and in your code I can
>> see you're doing {stop, Reason, State}.
>> Now, why is this happening, I don't know.
>>
>> Alin
>>
>> On Mon, Jun 3, 2019 at 1:18 AM I Gusti Ngurah Oka Prinarjaya <
>> okaprinarjaya@REDACTED> wrote:
>>
>>> Hi,
>>>
>>> I've use process_flag(trap_exit, true) in X:init() but still failed. X
>>> still died. mmm.. if i look closely to the error message, the erlang shell
>>> is also died
>>>
>>>
>>> Thank you
>>>
>>>
>>>
>>> Pada tanggal Sen, 3 Jun 2019 pukul 02.53 Alin Popa <alin.popa@REDACTED>
>>> menulis:
>>>
>>>> Looks like you've linked the Y process to the X process, therefore when
>>>> Y exists it'll take down X as well.
>>>> What you could do is to make process X to trap exit:
>>>>
>>>> ```
>>>> process_flat(trap_exit, true)
>>>> ```
>>>>
>>>> Usually you could add that within the `init` function of process X.
>>>> When you do that, if any linked process exists, it'll send a message to
>>>> the process X instead of taking it down.
>>>>
>>>> Hope that helps,
>>>> Alin
>>>>
>>>> On Sun, Jun 2, 2019 at 7:01 PM I Gusti Ngurah Oka Prinarjaya <
>>>> okaprinarjaya@REDACTED> wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> I create two gen_server. Let's say X gen_server, and Y gen_server.
>>>>>
>>>>> X gen_server do monitoring using erlang:monitor/2 to Y gen_server.
>>>>> When i do Y:stop(). X gen_server also died.
>>>>>
>>>>> I want to *X gen_server still alive* even monitored Y gen_server is
>>>>> died.
>>>>>
>>>>> This is X gen_server https://pastebin.com/G2xDNxMf
>>>>> This is Y gen_server https://pastebin.com/hWUfUPmn
>>>>>
>>>>> This is the result when i run my code
>>>>>
>>>>> 1> oka_oprek_agensrv:start_link().
>>>>>
>>>>> {ok,<0.86.0>}
>>>>>
>>>>> 2> oka_oprek_agensrv:start_bgensrv().
>>>>>
>>>>> {ok,start_bgensrv,
>>>>>
>>>>>     {<0.84.0>,#Ref<0.1555235413.310640643.180158>}}
>>>>>
>>>>> 3> oka_oprek_agensrv:hello().
>>>>>
>>>>> {ok,hello,{<0.84.0>,#Ref<0.1555235413.310640643.180166>}}
>>>>>
>>>>> 4> oka_oprek_bgensrv:hello().
>>>>>
>>>>> {ok,hello_from_b,
>>>>>
>>>>>     {<0.84.0>,#Ref<0.1555235413.310640643.180173>}}
>>>>>
>>>>> 5> oka_oprek_bgensrv:stop().
>>>>>
>>>>> Monitored process died. Ref=#Ref<0.1555235413.310640643.180161>,
>>>>> Pid=<0.88.0>
>>>>>
>>>>> ** exception exit: {normal,{gen_server,call,[bgensrv,stop]}}
>>>>>
>>>>>      in function  gen_server:call/2 (gen_server.erl, line 215)
>>>>>
>>>>> 6> oka_oprek_agensrv:hello().
>>>>>
>>>>> ** exception exit: {noproc,{gen_server,call,[agensrv,hello]}}
>>>>>
>>>>>      in function  gen_server:call/2 (gen_server.erl, line 215)
>>>>>
>>>>> 7>
>>>>>
>>>>>
>>>>> Please enlightenment
>>>>>
>>>>>
>>>>>
>>>>> Thank you
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> erlang-questions mailing list
>>>>> erlang-questions@REDACTED
>>>>> http://erlang.org/mailman/listinfo/erlang-questions
>>>>>
>>>>
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