如何停止gen_server:terminate/2中的其他应用程序？

-module(my_server).
-behaviour(gen_server).

-export([start_link/0, init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2, code_change/3]).

start_link() ->
    gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).

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

handle_call(_Request, _From, State) ->
    Reply = ok,
    {reply, Reply, State}.

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

handle_info(_Info, State) ->
    {noreply, State}.

terminate(_Reason, State) ->
    %% 停止其他应用程序
    OtherAppPid = erlang:whereis(my_app),
    case OtherAppPid of
        undefined -> ok;
        _ -> erlang:exit(OtherAppPid, shutdown)
    end,
    ok.

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