Lets say I have this module which I use as an entrypoint for my application:
defmodule A do
use Application
require Logger
def start(_, _) do
Logger.info("starting")
children = [{DynamicSupervisor, strategy: :one_for_one, name: Foo}]
{:ok, pid} = Supervisor.start_link(children, strategy: :one_for_one)
Logger.info("started")
{:ok, pid}
end
def stop(_), do: Logger.info("stopped")
end
When I do mix run I will get propper output about the application start, but not the application shutdown, while there are no stale beam processes left on my system and as such I conclude the application has exited one way or the other.
When I do iex -S mix and exit with C-c C-c, the result is the same. Startup logs are as expected, but no shutdown notice. Of course there are no zombie processes left.
mix run --no-halt, killed by C-c C-c behaves the same. Startup is fine, shutdown happens without logging.
If though I do iex -S mix and use System.stop/0, the application will also print the shut down logs before System.stop/0 will return :ok and iex exits.
Is there a way to get the stop/1 and prep_stop/1 callbacks called reliably?
(Well, I know that there are situations where I can not do that, eg. a kill -9 $myprocess, but lets say “as reliable as my operating system allows for it”).
