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

[I Gusti Ngurah Oka Prinarjaya]

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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