[erlang-questions] Why can not catch exception in gen_server init callback function?

Paul Davis <>
Wed Mar 31 18:09:41 CEST 2010


On Wed, Mar 31, 2010 at 11:48 AM, 钱晓明 <> wrote:
> Hi, Why can not catch exception in gen_server init callback function?
>
> init([]) ->
>    erlang:error(myerror),
>    {ok, #state{}}.
>
> Ex = (catch myserver:start_link()).
>
> process is terminated by exception myerror, but Ex is still unbound. Why?
>

I've found that using proc_lib:start_link, proc_lib:init_ack and
gen_server:enter_loop to be a very clean way to start gen_servers that
might fail during initialization. No idea if that's proper or not, but
it's treated me pretty well.

HTH,
Paul Davis


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