%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1996-2014. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
-module(gen_server_SUITE).
-include_lib("test_server/include/test_server.hrl").
-include_lib("kernel/include/inet.hrl").
-export([init_per_testcase/2, end_per_testcase/2]).
-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1,
init_per_group/2,end_per_group/2]).
-export([start/1, crash/1, call/1, cast/1, cast_fast/1,
info/1, abcast/1, multicall/1, multicall_down/1,
call_remote1/1, call_remote2/1, call_remote3/1,
call_remote_n1/1, call_remote_n2/1, call_remote_n3/1, spec_init/1,
spec_init_local_registered_parent/1,
spec_init_global_registered_parent/1,
otp_5854/1, hibernate/1, otp_7669/1, call_format_status/1,
error_format_status/1, get_state/1, replace_state/1, call_with_huge_message_queue/1
]).
-export([stop1/1, stop2/1, stop3/1, stop4/1, stop5/1, stop6/1, stop7/1,
stop8/1, stop9/1, stop10/1]).
% spawn export
-export([spec_init_local/2, spec_init_global/2, spec_init_via/2,
spec_init_default_timeout/2, spec_init_global_default_timeout/2,
spec_init_anonymous/1,
spec_init_anonymous_default_timeout/1,
spec_init_not_proc_lib/1, cast_fast_messup/0]).
% The gen_server behaviour
-export([init/1, handle_call/3, handle_cast/2,
handle_info/2, terminate/2, format_status/2]).
suite() -> [{ct_hooks,[ts_install_cth]}].
all() ->
[start, {group,stop}, crash, call, cast, cast_fast, info, abcast,
multicall, multicall_down, call_remote1, call_remote2,
call_remote3, call_remote_n1, call_remote_n2,
call_remote_n3, spec_init,
spec_init_local_registered_parent,
spec_init_global_registered_parent, otp_5854, hibernate,
otp_7669, call_format_status, error_format_status,
get_state, replace_state,
call_with_huge_message_queue].
groups() ->
[{stop, [],
[stop1, stop2, stop3, stop4, stop5, stop6, stop7, stop8, stop9, stop10]}].
init_per_suite(Config) ->
Config.
end_per_suite(_Config) ->
ok.
init_per_group(_GroupName, Config) ->
Config.
end_per_group(_GroupName, Config) ->
Config.
-define(default_timeout, ?t:minutes(1)).
init_per_testcase(Case, Config) when Case == call_remote1;
Case == call_remote2;
Case == call_remote3;
Case == call_remote_n1;
Case == call_remote_n2;
Case == call_remote_n3 ->
{ok,N} = start_node(hubba),
?line Dog = ?t:timetrap(?default_timeout),
[{node,N},{watchdog, Dog} | Config];
init_per_testcase(_Case, Config) ->
?line Dog = ?t:timetrap(?default_timeout),
[{watchdog, Dog} | Config].
end_per_testcase(_Case, Config) ->
case proplists:get_value(node, Config) of
undefined ->
ok;
N ->
test_server:stop_node(N)
end,
Dog = ?config(watchdog, Config),
test_server:timetrap_cancel(Dog),
ok.
%% --------------------------------------
%% Start and stop a gen_server.
%% --------------------------------------
start(suite) -> [];
start(Config) when is_list(Config) ->
OldFl = process_flag(trap_exit, true),
%% anonymous
?line {ok, Pid0} = gen_server:start(gen_server_SUITE, [], []),
?line ok = gen_server:call(Pid0, started_p),
?line ok = gen_server:call(Pid0, stop),
?line busy_wait_for_process(Pid0,600),
?line {'EXIT', {noproc,_}} = (catch gen_server:call(Pid0, started_p, 1)),
%% anonymous with timeout
?line {ok, Pid00} = gen_server:start(gen_server_SUITE, [],
[{timeout,1000}]),
?line ok = gen_server:call(Pid00, started_p),
?line ok = gen_server:call(Pid00, stop),
?line {error, timeout} = gen_server:start(gen_server_SUITE, sleep,
[{timeout,100}]),
%% anonymous with ignore
?line ignore = gen_server:start(gen_server_SUITE, ignore, []),
%% anonymous with stop
?line {error, stopped} = gen_server:start(gen_server_SUITE, stop, []),
%% anonymous linked
?line {ok, Pid1} =
gen_server:start_link(gen_server_SUITE, [], []),
?line ok = gen_server:call(Pid1, started_p),
?line ok = gen_server:call(Pid1, stop),
?line receive
{'EXIT', Pid1, stopped} ->
ok
after 5000 ->
test_server:fail(not_stopped)
end,
%% local register
?line {ok, Pid2} =
gen_server:start({local, my_test_name},
gen_server_SUITE, [], []),
?line ok = gen_server:call(my_test_name, started_p),
?line {error, {already_started, Pid2}} =
gen_server:start({local, my_test_name},
gen_server_SUITE, [], []),
?line ok = gen_server:call(my_test_name, stop),
?line busy_wait_for_process(Pid2,600),
?line {'EXIT', {noproc,_}} = (catch gen_server:call(Pid2, started_p, 10)),
%% local register linked
?line {ok, Pid3} =
gen_server:start_link({local, my_test_name},
gen_server_SUITE, [], []),
?line ok = gen_server:call(my_test_name, started_p),
?line {error, {already_started, Pid3}} =
gen_server:start({local, my_test_name},
gen_server_SUITE, [], []),
?line ok = gen_server:call(my_test_name, stop),
?line receive
{'EXIT', Pid3, stopped} ->
ok
after 5000 ->
test_server:fail(not_stopped)
end,
%% global register
?line {ok, Pid4} =
gen_server:start({global, my_test_name},
gen_server_SUITE, [], []),
?line ok = gen_server:call({global, my_test_name}, started_p),
?line {error, {already_started, Pid4}} =
gen_server:start({global, my_test_name},
gen_server_SUITE, [], []),
?line ok = gen_server:call({global, my_test_name}, stop),
test_server:sleep(1),
?line {'EXIT', {noproc,_}} = (catch gen_server:call(Pid4, started_p, 10)),
%% global register linked
?line {ok, Pid5} =
gen_server:start_link({global, my_test_name},
gen_server_SUITE, [], []),
?line ok = gen_server:call({global, my_test_name}, started_p),
?line {error, {already_started, Pid5}} =
gen_server:start({global, my_test_name},
gen_server_SUITE, [], []),
?line ok = gen_server:call({global, my_test_name}, stop),
?line receive
{'EXIT', Pid5, stopped} ->
ok
after 5000 ->
test_server:fail(not_stopped)
end,
%% via register
?line dummy_via:reset(),
?line {ok, Pid6} =
gen_server:start({via, dummy_via, my_test_name},
gen_server_SUITE, [], []),
?line ok = gen_server:call({via, dummy_via, my_test_name}, started_p),
?line {error, {already_started, Pid6}} =
gen_server:start({via, dummy_via, my_test_name},
gen_server_SUITE, [], []),
?line ok = gen_server:call({via, dummy_via, my_test_name}, stop),
test_server:sleep(1),
?line {'EXIT', {noproc,_}} = (catch gen_server:call(Pid6, started_p, 10)),
%% via register linked
?line dummy_via:reset(),
?line {ok, Pid7} =
gen_server:start_link({via, dummy_via, my_test_name},
gen_server_SUITE, [], []),
?line ok = gen_server:call({via, dummy_via, my_test_name}, started_p),
?line {error, {already_started, Pid7}} =
gen_server:start({via, dummy_via, my_test_name},
gen_server_SUITE, [], []),
?line ok = gen_server:call({via, dummy_via, my_test_name}, stop),
?line receive
{'EXIT', Pid7, stopped} ->
ok
after 5000 ->
test_server:fail(not_stopped)
end,
test_server:messages_get(),
process_flag(trap_exit, OldFl),
ok.
%% Anonymous, reason 'normal'
stop1(_Config) ->
{ok, Pid} = gen_server:start(?MODULE, [], []),
ok = gen_server:stop(Pid),
false = erlang:is_process_alive(Pid),
{'EXIT',noproc} = (catch gen_server:stop(Pid)),
ok.
%% Anonymous, other reason
stop2(_Config) ->
{ok,Pid} = gen_server:start(?MODULE, [], []),
ok = gen_server:stop(Pid, other_reason, infinity),
false = erlang:is_process_alive(Pid),
ok.
%% Anonymous, invalid timeout
stop3(_Config) ->
{ok,Pid} = gen_server:start(?MODULE, [], []),
{'EXIT',_} = (catch gen_server:stop(Pid, other_reason, invalid_timeout)),
true = erlang:is_process_alive(Pid),
ok = gen_server:stop(Pid),
false = erlang:is_process_alive(Pid),
ok.
%% Registered name
stop4(_Config) ->
{ok,Pid} = gen_server:start({local,to_stop},?MODULE, [], []),
ok = gen_server:stop(to_stop),
false = erlang:is_process_alive(Pid),
{'EXIT',noproc} = (catch gen_server:stop(to_stop)),
ok.
%% Registered name and local node
stop5(_Config) ->
{ok,Pid} = gen_server:start({local,to_stop},?MODULE, [], []),
ok = gen_server:stop({to_stop,node()}),
false = erlang:is_process_alive(Pid),
{'EXIT',noproc} = (catch gen_server:stop({to_stop,node()})),
ok.
%% Globally registered name
stop6(_Config) ->
{ok, Pid} = gen_server:start({global, to_stop}, ?MODULE, [], []),
ok = gen_server:stop({global,to_stop}),
false = erlang:is_process_alive(Pid),
{'EXIT',noproc} = (catch gen_server:stop({global,to_stop})),
ok.
%% 'via' registered name
stop7(_Config) ->
dummy_via:reset(),
{ok, Pid} = gen_server:start({via, dummy_via, to_stop},
?MODULE, [], []),
ok = gen_server:stop({via, dummy_via, to_stop}),
false = erlang:is_process_alive(Pid),
{'EXIT',noproc} = (catch gen_server:stop({via, dummy_via, to_stop})),
ok.
%% Anonymous on remote node
stop8(_Config) ->
{ok,Node} = test_server:start_node(gen_server_SUITE_stop8,slave,[]),
Dir = filename:dirname(code:which(?MODULE)),
rpc:call(Node,code,add_path,[Dir]),
{ok, Pid} = rpc:call(Node,gen_server,start,[?MODULE,[],[]]),
ok = gen_server:stop(Pid),
false = rpc:call(Node,erlang,is_process_alive,[Pid]),
{'EXIT',noproc} = (catch gen_server:stop(Pid)),
true = test_server:stop_node(Node),
{'EXIT',{{nodedown,Node},_}} = (catch gen_server:stop(Pid)),
ok.
%% Registered name on remote node
stop9(_Config) ->
{ok,Node} = test_server:start_node(gen_server_SUITE_stop9,slave,[]),
Dir = filename:dirname(code:which(?MODULE)),
rpc:call(Node,code,add_path,[Dir]),
{ok, Pid} = rpc:call(Node,gen_server,start,[{local,to_stop},?MODULE,[],[]]),
ok = gen_server:stop({to_stop,Node}),
undefined = rpc:call(Node,erlang,whereis,[to_stop]),
false = rpc:call(Node,erlang,is_process_alive,[Pid]),
{'EXIT',noproc} = (catch gen_server:stop({to_stop,Node})),
true = test_server:stop_node(Node),
{'EXIT',{{nodedown,Node},_}} = (catch gen_server:stop({to_stop,Node})),
ok.
%% Globally registered name on remote node
stop10(_Config) ->
{ok,Node} = test_server:start_node(gen_server_SUITE_stop10,slave,[]),
Dir = filename:dirname(code:which(?MODULE)),
rpc:call(Node,code,add_path,[Dir]),
{ok, Pid} = rpc:call(Node,gen_server,start,[{global,to_stop},?MODULE,[],[]]),
global:sync(),
ok = gen_server:stop({global,to_stop}),
false = rpc:call(Node,erlang,is_process_alive,[Pid]),
{'EXIT',noproc} = (catch gen_server:stop({global,to_stop})),
true = test_server:stop_node(Node),
{'EXIT',noproc} = (catch gen_server:stop({global,to_stop})),
ok.
crash(Config) when is_list(Config) ->
?line error_logger_forwarder:register(),
process_flag(trap_exit, true),
%% This crash should not generate a crash report.
?line {ok,Pid0} = gen_server:start_link(?MODULE, [], []),
?line {'EXIT',{{shutdown,reason},_}} =
(catch gen_server:call(Pid0, shutdown_reason)),
receive {'EXIT',Pid0,{shutdown,reason}} -> ok end,
%% This crash should not generate a crash report.
?line {ok,Pid1} = gen_server:start_link(?MODULE, {state,state1}, []),
?line {'EXIT',{{shutdown,stop_reason},_}} =
(catch gen_server:call(Pid1, stop_shutdown_reason)),
receive {'EXIT',Pid1,{shutdown,stop_reason}} -> ok end,
%% This crash should not generate a crash report.
?line {ok,Pid2} = gen_server:start_link(?MODULE, [], []),
?line {'EXIT',{shutdown,_}} =
(catch gen_server:call(Pid2, exit_shutdown)),
receive {'EXIT',Pid2,shutdown} -> ok end,
%% This crash should not generate a crash report.
?line {ok,Pid3} = gen_server:start_link(?MODULE, {state,state3}, []),
?line {'EXIT',{shutdown,_}} =
(catch gen_server:call(Pid3, stop_shutdown)),
receive {'EXIT',Pid3,shutdown} -> ok end,
process_flag(trap_exit, false),
%% This crash should generate a crash report and a report
%% from gen_server.
?line {ok,Pid4} = gen_server:start(?MODULE, {state,state4}, []),
?line {'EXIT',{crashed,_}} = (catch gen_server:call(Pid4, crash)),
receive
{error,_GroupLeader4,{Pid4,
"** Generic server"++_,
[Pid4,crash,state4,crashed]}} ->
ok;
Other4a ->
?line io:format("Unexpected: ~p", [Other4a]),
?line ?t:fail()
end,
receive
{error_report,_,{Pid4,crash_report,[List4|_]}} ->
{exit,crashed,_} = proplists:get_value(error_info, List4),
Pid4 = proplists:get_value(pid, List4);
Other4 ->
?line io:format("Unexpected: ~p", [Other4]),
?line ?t:fail()
end,
receive
Any ->
?line io:format("Unexpected: ~p", [Any]),
?line ?t:fail()
after 500 ->
ok
end,
ok.
%% --------------------------------------
%% Test gen_server:call and handle_call.
%% Test all different return values from
%% handle_call.
%% --------------------------------------
call(suite) -> [];
call(Config) when is_list(Config) ->
OldFl = process_flag(trap_exit, true),
?line {ok, _Pid} =
gen_server:start_link({local, my_test_name},
gen_server_SUITE, [], []),
?line ok = gen_server:call(my_test_name, started_p),
?line delayed = gen_server:call(my_test_name, {delayed_answer,1}),
%% two requests within a specified time.
?line ok = gen_server:call(my_test_name, {call_within, 1000}),
test_server:sleep(500),
?line ok = gen_server:call(my_test_name, next_call),
?line ok = gen_server:call(my_test_name, {call_within, 1000}),
test_server:sleep(1500),
?line false = gen_server:call(my_test_name, next_call),
%% timeout call.
?line delayed = gen_server:call(my_test_name, {delayed_answer,1}, 30),
?line {'EXIT',{timeout,_}} =
(catch gen_server:call(my_test_name, {delayed_answer,30}, 1)),
%% bad return value in the gen_server loop from handle_call.
?line {'EXIT',{{bad_return_value, badreturn},_}} =
(catch gen_server:call(my_test_name, badreturn)),
process_flag(trap_exit, OldFl),
ok.
%% --------------------------------------
%% Test call to nonexisting processes on remote nodes
%% --------------------------------------
start_node(Name) ->
?line Pa = filename:dirname(code:which(?MODULE)),
?line N = test_server:start_node(Name, slave, [{args, " -pa " ++ Pa}]),
%% After starting a slave, it takes a little while until global knows
%% about it, even if nodes() includes it, so we make sure that global
%% knows about it before registering something on all nodes.
global:sync(),
N.
call_remote1(suite) -> [];
call_remote1(Config) when is_list(Config) ->
N = hubba,
?line Node = proplists:get_value(node,Config),
?line {ok, Pid} = rpc:call(Node, gen_server, start,
[{global, N}, ?MODULE, [], []]),
?line ok = (catch gen_server:call({global, N}, started_p, infinity)),
?line exit(Pid, boom),
?line {'EXIT', {Reason, _}} = (catch gen_server:call({global, N},
started_p, infinity)),
?line true = (Reason == noproc) orelse (Reason == boom),
ok.
call_remote2(suite) -> [];
call_remote2(Config) when is_list(Config) ->
?line N = hubba,
?line Node = proplists:get_value(node,Config),
?line {ok, Pid} = rpc:call(Node, gen_server, start,
[{global, N}, ?MODULE, [], []]),
?line ok = (catch gen_server:call(Pid, started_p, infinity)),
?line exit(Pid, boom),
?line {'EXIT', {Reason, _}} = (catch gen_server:call(Pid,
started_p, infinity)),
?line true = (Reason == noproc) orelse (Reason == boom),
ok.
call_remote3(suite) -> [];
call_remote3(Config) when is_list(Config) ->
?line Node = proplists:get_value(node,Config),
?line {ok, Pid} = rpc:call(Node, gen_server, start,
[{local, piller}, ?MODULE, [], []]),
?line ok = (catch gen_server:call({piller, Node}, started_p, infinity)),
?line exit(Pid, boom),
?line {'EXIT', {Reason, _}} = (catch gen_server:call({piller, Node},
started_p, infinity)),
?line true = (Reason == noproc) orelse (Reason == boom),
ok.
%% --------------------------------------
%% Test call to nonexisting node
%% --------------------------------------
call_remote_n1(suite) -> [];
call_remote_n1(Config) when is_list(Config) ->
?line N = hubba,
?line Node = proplists:get_value(node,Config),
?line {ok, _Pid} = rpc:call(Node, gen_server, start,
[{global, N}, ?MODULE, [], []]),
?line _ = test_server:stop_node(Node),
?line {'EXIT', {noproc, _}} =
(catch gen_server:call({global, N}, started_p, infinity)),
ok.
call_remote_n2(suite) -> [];
call_remote_n2(Config) when is_list(Config) ->
?line N = hubba,
?line Node = proplists:get_value(node,Config),
?line {ok, Pid} = rpc:call(Node, gen_server, start,
[{global, N}, ?MODULE, [], []]),
?line _ = test_server:stop_node(Node),
?line {'EXIT', {{nodedown, Node}, _}} = (catch gen_server:call(Pid,
started_p, infinity)),
ok.
call_remote_n3(suite) -> [];
call_remote_n3(Config) when is_list(Config) ->
?line Node = proplists:get_value(node,Config),
?line {ok, _Pid} = rpc:call(Node, gen_server, start,
[{local, piller}, ?MODULE, [], []]),
?line _ = test_server:stop_node(Node),
?line {'EXIT', {{nodedown, Node}, _}} = (catch gen_server:call({piller, Node},
started_p, infinity)),
ok.
%% --------------------------------------
%% Test gen_server:cast and handle_cast.
%% Test all different return values from
%% handle_cast.
%% --------------------------------------
cast(suite) -> [];
cast(Config) when is_list(Config) ->
?line {ok, Pid} =
gen_server:start({local, my_test_name},
gen_server_SUITE, [], []),
?line ok = gen_server:call(my_test_name, started_p),
?line ok = gen_server:cast(my_test_name, {self(),handle_cast}),
?line receive
{Pid, handled_cast} ->
ok
after 1000 ->
test_server:fail(handle_cast)
end,
?line ok = gen_server:cast(my_test_name, {self(),delayed_cast,1}),
?line receive
{Pid, delayed} ->
ok
after 1000 ->
test_server:fail(delayed_cast)
end,
?line ok = gen_server:cast(my_test_name, {self(),stop}),
?line receive
{Pid, stopped} ->
ok
after 1000 ->
test_server:fail(stop)
end,
ok.
cast_fast(suite) -> [];
cast_fast(doc) -> ["Test that cast really return immediately"];
cast_fast(Config) when is_list(Config) ->
?line {ok,Node} = start_node(hubba),
?line {_,"@"++Host} = lists:splitwith(fun ($@) -> false; (_) -> true end,
atom_to_list(Node)),
?line FalseNode = list_to_atom("hopp@"++Host),
?line true = rpc:cast(Node, ?MODULE, cast_fast_messup, []),
% ?line io:format("Nodes ~p~n", [rpc:call(N, ?MODULE, cast_fast_messup, [])]),
?line test_server:sleep(1000),
?line [Node] = nodes(),
?line {Time,ok} = test_server:timecall(gen_server, cast,
[{hopp,FalseNode},hopp]),
?line true = test_server:stop_node(Node),
?line if Time > 1.0 -> % Default listen timeout is about 7.0 s
test_server:fail(hanging_cast);
true ->
ok
end.
cast_fast_messup() ->
%% Register a false node: hopp@hostname
unregister(erl_epmd),
erl_epmd:start_link(),
{ok,S} = gen_tcp:listen(0, []),
{ok,P} = inet:port(S),
{ok,_Creation} = erl_epmd:register_node(hopp, P),
receive after infinity -> ok end.
%% --------------------------------------
%% Test handle_info.
%% --------------------------------------
info(suite) -> [];
info(Config) when is_list(Config) ->
?line {ok, Pid} =
gen_server:start({local, my_test_name},
gen_server_SUITE, [], []),
?line ok = gen_server:call(my_test_name, started_p),
?line Pid ! {self(),handle_info},
?line receive
{Pid, handled_info} ->
ok
after 1000 ->
test_server:fail(handle_info)
end,
?line Pid ! {self(),delayed_info,1},
?line receive
{Pid, delayed_info} ->
ok
after 1000 ->
test_server:fail(delayed_info)
end,
?line Pid ! {self(),stop},
?line receive
{Pid, stopped_info} ->
ok
after 1000 ->
test_server:fail(stop_info)
end,
ok.
hibernate(suite) -> [];
hibernate(Config) when is_list(Config) ->
OldFl = process_flag(trap_exit, true),
?line {ok, Pid0} =
gen_server:start_link({local, my_test_name_hibernate0},
gen_server_SUITE, hibernate, []),
?line receive after 1000 -> ok end,
?line {current_function,{erlang,hibernate,3}} = erlang:process_info(Pid0,current_function),
?line ok = gen_server:call(my_test_name_hibernate0, stop),
receive
{'EXIT', Pid0, stopped} ->
ok
after 5000 ->
test_server:fail(gen_server_did_not_die)
end,
?line {ok, Pid} =
gen_server:start_link({local, my_test_name_hibernate},
gen_server_SUITE, [], []),
?line ok = gen_server:call(my_test_name_hibernate, started_p),
?line true = gen_server:call(my_test_name_hibernate, hibernate),
?line receive after 1000 -> ok end,
?line {current_function,{erlang,hibernate,3}} = erlang:process_info(Pid,current_function),
?line Parent = self(),
Fun = fun() ->
receive
go ->
ok
end,
receive
after 1000 ->
ok
end,
X = erlang:process_info(Pid,current_function),
Pid ! continue,
Parent ! {result,X}
end,
?line Pid2 = spawn_link(Fun),
?line true = gen_server:call(my_test_name_hibernate, {hibernate_noreply,Pid2}),
?line gen_server:cast(my_test_name_hibernate, hibernate_later),
?line true = ({current_function,{erlang,hibernate,3}} =/= erlang:process_info(Pid,current_function)),
?line receive after 2000 -> ok end,
?line ({current_function,{erlang,hibernate,3}} = erlang:process_info(Pid,current_function)),
?line ok = gen_server:call(my_test_name_hibernate, started_p),
?line true = ({current_function,{erlang,hibernate,3}} =/= erlang:process_info(Pid,current_function)),
?line gen_server:cast(my_test_name_hibernate, hibernate_now),
?line receive after 1000 -> ok end,
?line ({current_function,{erlang,hibernate,3}} = erlang:process_info(Pid,current_function)),
?line ok = gen_server:call(my_test_name_hibernate, started_p),
?line true = ({current_function,{erlang,hibernate,3}} =/= erlang:process_info(Pid,current_function)),
?line Pid ! hibernate_later,
?line true = ({current_function,{erlang,hibernate,3}} =/= erlang:process_info(Pid,current_function)),
?line receive after 2000 -> ok end,
?line ({current_function,{erlang,hibernate,3}} = erlang:process_info(Pid,current_function)),
?line ok = gen_server:call(my_test_name_hibernate, started_p),
?line true = ({current_function,{erlang,hibernate,3}} =/= erlang:process_info(Pid,current_function)),
?line Pid ! hibernate_now,
?line receive after 1000 -> ok end,
?line ({current_function,{erlang,hibernate,3}} = erlang:process_info(Pid,current_function)),
?line ok = gen_server:call(my_test_name_hibernate, started_p),
?line true = ({current_function,{erlang,hibernate,3}} =/= erlang:process_info(Pid,current_function)),
?line receive
{result,R} ->
?line {current_function,{erlang,hibernate,3}} = R
end,
?line true = gen_server:call(my_test_name_hibernate, hibernate),
?line receive after 1000 -> ok end,
?line {current_function,{erlang,hibernate,3}} = erlang:process_info(Pid,current_function),
?line sys:suspend(my_test_name_hibernate),
?line receive after 1000 -> ok end,
?line {current_function,{erlang,hibernate,3}} = erlang:process_info(Pid,current_function),
?line sys:resume(my_test_name_hibernate),
?line receive after 1000 -> ok end,
?line {current_function,{erlang,hibernate,3}} = erlang:process_info(Pid,current_function),
?line ok = gen_server:call(my_test_name_hibernate, started_p),
?line true = ({current_function,{erlang,hibernate,3}} =/= erlang:process_info(Pid,current_function)),
?line ok = gen_server:call(my_test_name_hibernate, stop),
receive
{'EXIT', Pid, stopped} ->
ok
after 5000 ->
test_server:fail(gen_server_did_not_die)
end,
process_flag(trap_exit, OldFl),
ok.
%% --------------------------------------
%% Test gen_server:abcast and handle_cast.
%% Test all different return values from
%% handle_cast.
%% --------------------------------------
abcast(suite) -> [];
abcast(Config) when is_list(Config) ->
?line {ok, Pid} =
gen_server:start({local, my_test_name},
gen_server_SUITE, [], []),
?line ok = gen_server:call(my_test_name, started_p),
?line abcast = gen_server:abcast(my_test_name, {self(),handle_cast}),
?line receive
{Pid, handled_cast} ->
ok
after 1000 ->
test_server:fail(abcast)
end,
?line abcast = gen_server:abcast([node()], my_test_name,
{self(),delayed_cast,1}),
?line receive
{Pid, delayed} ->
ok
after 1000 ->
test_server:fail(delayed_abcast)
end,
?line abcast = gen_server:abcast(my_test_name, {self(),stop}),
?line receive
{Pid, stopped} ->
ok
after 1000 ->
test_server:fail(abcast_stop)
end,
ok.
%% --------------------------------------
%% Test gen_server:multicall and handle_call.
%% Test all different return values from
%% handle_call.
%% --------------------------------------
multicall(suite) -> [];
multicall(Config) when is_list(Config) ->
OldFl = process_flag(trap_exit, true),
?line {ok, Pid} =
gen_server:start_link({local, my_test_name},
gen_server_SUITE, [], []),
?line ok = gen_server:call(my_test_name, started_p),
Nodes = nodes(),
Node = node(),
?line {[{Node,delayed}],Nodes} =
gen_server:multi_call(my_test_name, {delayed_answer,1}),
%% two requests within a specified time.
?line {[{Node,ok}],[]} =
gen_server:multi_call([Node], my_test_name, {call_within, 1000}),
test_server:sleep(500),
?line {[{Node,ok}],[]} =
gen_server:multi_call([Node], my_test_name, next_call),
?line {[{Node,ok}],[]} =
gen_server:multi_call([Node], my_test_name, {call_within, 1000}),
test_server:sleep(1500),
?line {[{Node,false}],[]} =
gen_server:multi_call([Node],my_test_name, next_call),
%% Stop the server.
?line {[{Node,ok}],[]} =
gen_server:multi_call([Node],my_test_name, stop),
receive
{'EXIT', Pid, stopped} -> ok
after 1000 ->
test_server:fail(multicall_stop)
end,
process_flag(trap_exit, OldFl),
ok.
%% OTP-3587
multicall_down(suite) -> [];
multicall_down(Config) when is_list(Config) ->
%% We need a named host which is inaccessible.
?line Name = node@test01,
%% We use 'global' as a gen_server to call.
?line {Good, Bad} = gen_server:multi_call([Name, node()],
global_name_server,
info,
3000),
io:format("good = ~p, bad = ~p~n", [Good, Bad]),
?line [Name] = Bad,
ok.
busy_wait_for_process(Pid,N) ->
case erlang:is_process_alive(Pid) of
true ->
receive
after 100 ->
ok
end,
busy_wait_for_process(Pid,N-1);
_ ->
ok
end.
%%--------------------------------------------------------------
spec_init(doc) ->
["Test gen_server:enter_loop/[3,4,5]. Used when you want to write "
"your own special init-phase."];
spec_init(suite) ->
[];
spec_init(Config) when is_list(Config) ->
OldFlag = process_flag(trap_exit, true),
?line {ok, Pid0} = start_link(spec_init_local, [{ok, my_server}, []]),
?line ok = gen_server:call(Pid0, started_p),
?line ok = gen_server:call(Pid0, stop),
receive
{'EXIT', Pid0, stopped} ->
ok
after 5000 ->
test_server:fail(gen_server_did_not_die)
end,
?line {ok, Pid01} = start_link(spec_init_local, [{not_ok, my_server}, []]),
receive
{'EXIT', Pid01, process_not_registered} ->
ok
after 5000 ->
test_server:fail(gen_server_did_not_die)
end,
?line {ok, Pid1} = start_link(spec_init_global, [{ok, my_server}, []]),
?line ok = gen_server:call(Pid1, started_p),
?line ok = gen_server:call(Pid1, stop),
receive
{'EXIT', Pid1, stopped} ->
ok
after 5000 ->
test_server:fail(gen_server_did_not_die)
end,
?line {ok, Pid11} =
start_link(spec_init_global, [{not_ok, my_server}, []]),
receive
{'EXIT', Pid11, process_not_registered_globally} ->
ok
after 5000 ->
test_server:fail(gen_server_did_not_die)
end,
?line {ok, Pid2} = start_link(spec_init_anonymous, [[]]),
?line ok = gen_server:call(Pid2, started_p),
?line ok = gen_server:call(Pid2, stop),
receive
{'EXIT', Pid2, stopped} ->
ok
after 5000 ->
test_server:fail(gen_server_did_not_die)
end,
?line {ok, Pid3} = start_link(spec_init_anonymous_default_timeout, [[]]),
?line ok = gen_server:call(Pid3, started_p),
?line ok = gen_server:call(Pid3, stop),
receive
{'EXIT', Pid3, stopped} ->
ok
after 5000 ->
test_server:fail(gen_server_did_not_die)
end,
?line {ok, Pid4} =
start_link(spec_init_default_timeout, [{ok, my_server}, []]),
?line ok = gen_server:call(Pid4, started_p),
?line ok = gen_server:call(Pid4, stop),
receive
{'EXIT', Pid4, stopped} ->
ok
after 5000 ->
test_server:fail(gen_server_did_not_die)
end,
%% Before the OTP-10130 fix this failed because a timeout message
%% was generated as the spawned process crashed because a {global, Name}
%% was matched as a timeout value instead of matching on scope.
{ok, _PidHurra} =
start_link(spec_init_global_default_timeout, [{ok, hurra}, []]),
timer:sleep(1000),
ok = gen_server:call(_PidHurra, started_p),
?line Pid5 =
erlang:spawn_link(?MODULE, spec_init_not_proc_lib, [[]]),
receive
{'EXIT', Pid5, process_was_not_started_by_proc_lib} ->
ok
after 5000 ->
test_server:fail(gen_server_did_not_die)
end,
process_flag(trap_exit, OldFlag),
ok.
%%--------------------------------------------------------------
spec_init_local_registered_parent(doc) ->
["Test that terminate is run when the parent is a locally registered "
"process OTP-4820"];
spec_init_local_registered_parent(suite) -> [];
spec_init_local_registered_parent(Config) when is_list(Config) ->
register(foobar, self()),
process_flag(trap_exit, true),
?line {ok, Pid} = start_link(spec_init_local, [{ok, my_server}, []]),
?line ok = gen_server:cast(my_server, {self(),stop}),
?line receive
{Pid, stopped} ->
ok
after 1000 ->
test_server:fail(stop)
end,
unregister(foobar),
ok.
%%--------------------------------------------------------------
spec_init_global_registered_parent(doc) ->
["Test that terminate is run when the parent is a global registered "
"process OTP-4820"];
spec_init_global_registered_parent(suite) -> [];
spec_init_global_registered_parent(Config) when is_list(Config) ->
global:register_name(foobar, self()),
process_flag(trap_exit, true),
?line {ok, Pid} = start_link(spec_init_global, [{ok, my_server}, []]),
?line ok = gen_server:call(Pid, started_p),
?line ok = gen_server:cast(Pid, {self(),stop}),
?line receive
{Pid, stopped} ->
ok
after 1000 ->
test_server:fail(stop)
end,
global:unregister_name(foobar),
ok.
%%--------------------------------------------------------------
otp_5854(suite) ->
[];
otp_5854(doc) ->
["Test check for registered name in enter_loop/3,4,5"];
otp_5854(Config) when is_list(Config) ->
OldFlag = process_flag(trap_exit, true),
?line dummy_via:reset(),
%% Make sure gen_server:enter_loop does not accept {local,Name}
%% when it's another process than the calling one which is
%% registered under that name
register(armitage, self()),
?line {ok, Pid1} =
start_link(spec_init_local, [{not_ok, armitage}, []]),
receive
{'EXIT', Pid1, process_not_registered} ->
ok
after 1000 ->
?line test_server:fail(gen_server_started)
end,
unregister(armitage),
%% Make sure gen_server:enter_loop does not accept {global,Name}
%% when it's another process than the calling one which is
%% registered under that name
global:register_name(armitage, self()),
?line {ok, Pid2} =
start_link(spec_init_global, [{not_ok, armitage}, []]),
receive
{'EXIT', Pid2, process_not_registered_globally} ->
ok
after 1000 ->
?line test_server:fail(gen_server_started)
end,
global:unregister_name(armitage),
%% (same for {via, Mod, Name})
dummy_via:register_name(armitage, self()),
?line {ok, Pid3} =
start_link(spec_init_via, [{not_ok, armitage}, []]),
receive
{'EXIT', Pid3, {process_not_registered_via, dummy_via}} ->
ok
after 1000 ->
?line test_server:fail(gen_server_started)
end,
dummy_via:unregister_name(armitage),
process_flag(trap_exit, OldFlag),
ok.
%% If initialization fails (with ignore or {stop,Reason}),
%% make sure that the process is not registered when gen_server:start()
%% returns.
otp_7669(Config) when is_list(Config) ->
?line ?t:do_times(100, fun do_otp_7669_local_ignore/0),
?line ?t:do_times(100, fun do_otp_7669_global_ignore/0),
?line ?t:do_times(10, fun do_otp_7669_stop/0),
ok.
do_otp_7669_local_ignore() ->
%% The name should never be registered after the return
%% from gen_server:start/3.
?line ignore = gen_server:start({local,?MODULE}, ?MODULE, ignore, []),
?line undefined = whereis(?MODULE),
?line ignore = gen_server:start({local,?MODULE}, ?MODULE, ignore, []),
?line undefined = whereis(?MODULE),
?line ignore = gen_server:start_link({local,?MODULE}, ?MODULE, ignore, []),
?line undefined = whereis(?MODULE).
do_otp_7669_global_ignore() ->
?line ignore = gen_server:start({global,?MODULE}, ?MODULE, ignore, []),
?line undefined = global:whereis_name(?MODULE),
?line ignore = gen_server:start_link({global,?MODULE}, ?MODULE, ignore, []),
?line undefined = global:whereis_name(?MODULE).
do_otp_7669_stop() ->
%% The name should never be registered after the return
%% from gen_server:start/3.
?line {error,stopped} = gen_server:start({local,?MODULE},
?MODULE, stop, []),
?line undefined = whereis(?MODULE),
?line {error,stopped} = gen_server:start({global,?MODULE},
?MODULE, stop, []),
?line undefined = global:whereis_name(?MODULE).
%% Verify that sys:get_status correctly calls our format_status/2 fun
%%
call_format_status(suite) ->
[];
call_format_status(doc) ->
["Test that sys:get_status/1,2 calls format_status/2"];
call_format_status(Config) when is_list(Config) ->
?line {ok, Pid} = gen_server:start_link({local, call_format_status},
?MODULE, [], []),
?line Status1 = sys:get_status(call_format_status),
?line {status, Pid, _Mod, [_PDict, running, _Parent, _, Data1]} = Status1,
?line [format_status_called | _] = lists:reverse(Data1),
?line Status2 = sys:get_status(call_format_status, 5000),
?line {status, Pid, _Mod, [_PDict, running, _Parent, _, Data2]} = Status2,
?line [format_status_called | _] = lists:reverse(Data2),
%% check that format_status can handle a name being a pid (atom is
%% already checked by the previous test)
?line {ok, Pid3} = gen_server:start_link(gen_server_SUITE, [], []),
?line Status3 = sys:get_status(Pid3),
?line {status, Pid3, _Mod, [_PDict3, running, _Parent, _, Data3]} = Status3,
?line [format_status_called | _] = lists:reverse(Data3),
%% check that format_status can handle a name being a term other than a
%% pid or atom
GlobalName1 = {global, "CallFormatStatus"},
?line {ok, Pid4} = gen_server:start_link(GlobalName1,
gen_server_SUITE, [], []),
?line Status4 = sys:get_status(Pid4),
?line {status, Pid4, _Mod, [_PDict4, running, _Parent, _, Data4]} = Status4,
?line [format_status_called | _] = lists:reverse(Data4),
GlobalName2 = {global, {name, "term"}},
?line {ok, Pid5} = gen_server:start_link(GlobalName2,
gen_server_SUITE, [], []),
?line Status5 = sys:get_status(GlobalName2),
?line {status, Pid5, _Mod, [_PDict5, running, _Parent, _, Data5]} = Status5,
?line [format_status_called | _] = lists:reverse(Data5),
ok.
%% Verify that error termination correctly calls our format_status/2 fun
%%
error_format_status(suite) ->
[];
error_format_status(doc) ->
["Test that an error termination calls format_status/2"];
error_format_status(Config) when is_list(Config) ->
?line error_logger_forwarder:register(),
OldFl = process_flag(trap_exit, true),
State = "called format_status",
?line {ok, Pid} = gen_server:start_link(?MODULE, {state, State}, []),
?line {'EXIT',{crashed,_}} = (catch gen_server:call(Pid, crash)),
receive
{'EXIT', Pid, crashed} ->
ok
end,
receive
{error,_GroupLeader,{Pid,
"** Generic server"++_,
[Pid,crash,State,crashed]}} ->
ok;
Other ->
?line io:format("Unexpected: ~p", [Other]),
?line ?t:fail()
end,
?t:messages_get(),
process_flag(trap_exit, OldFl),
ok.
%% Verify that sys:get_state correctly returns gen_server state
%%
get_state(suite) ->
[];
get_state(doc) ->
["Test that sys:get_state/1,2 return the gen_server state"];
get_state(Config) when is_list(Config) ->
State = self(),
{ok, _Pid} = gen_server:start_link({local, get_state},
?MODULE, {state,State}, []),
State = sys:get_state(get_state),
State = sys:get_state(get_state, 5000),
{ok, Pid} = gen_server:start_link(?MODULE, {state,State}, []),
State = sys:get_state(Pid),
State = sys:get_state(Pid, 5000),
ok = sys:suspend(Pid),
State = sys:get_state(Pid),
ok = sys:resume(Pid),
ok.
%% Verify that sys:replace_state correctly replaces gen_server state
%%
replace_state(suite) ->
[];
replace_state(doc) ->
["Test that sys:replace_state/1,2 replace the gen_server state"];
replace_state(Config) when is_list(Config) ->
State = self(),
{ok, _Pid} = gen_server:start_link({local, replace_state},
?MODULE, {state,State}, []),
State = sys:get_state(replace_state),
NState1 = "replaced",
Replace1 = fun(_) -> NState1 end,
NState1 = sys:replace_state(replace_state, Replace1),
NState1 = sys:get_state(replace_state),
{ok, Pid} = gen_server:start_link(?MODULE, {state,NState1}, []),
NState1 = sys:get_state(Pid),
Suffix = " again",
NState2 = NState1 ++ Suffix,
Replace2 = fun(S) -> S ++ Suffix end,
NState2 = sys:replace_state(Pid, Replace2, 5000),
NState2 = sys:get_state(Pid, 5000),
%% verify no change in state if replace function crashes
Replace3 = fun(_) -> throw(fail) end,
{'EXIT',{{callback_failed,
{gen_server,system_replace_state},{throw,fail}},_}} =
(catch sys:replace_state(Pid, Replace3)),
NState2 = sys:get_state(Pid, 5000),
%% verify state replaced if process sys suspended
ok = sys:suspend(Pid),
Suffix2 = " and again",
NState3 = NState2 ++ Suffix2,
Replace4 = fun(S) -> S ++ Suffix2 end,
NState3 = sys:replace_state(Pid, Replace4),
ok = sys:resume(Pid),
NState3 = sys:get_state(Pid, 5000),
ok.
%% Test that the time for a huge message queue is not
%% significantly slower than with an empty message queue.
call_with_huge_message_queue(Config) when is_list(Config) ->
case test_server:is_native(gen) of
true ->
{skip,
"gen is native - huge message queue optimization "
"is not implemented"};
false ->
do_call_with_huge_message_queue()
end.
do_call_with_huge_message_queue() ->
?line Pid = spawn_link(fun echo_loop/0),
?line {Time,ok} = tc(fun() -> calls(10000, Pid) end),
?line [self() ! {msg,N} || N <- lists:seq(1, 500000)],
erlang:garbage_collect(),
?line {NewTime,ok} = tc(fun() -> calls(10000, Pid) end),
io:format("Time for empty message queue: ~p", [Time]),
io:format("Time for huge message queue: ~p", [NewTime]),
IsCover = test_server:is_cover(),
case (NewTime+1) / (Time+1) of
Q when Q < 10; IsCover ->
ok;
Q ->
io:format("Q = ~p", [Q]),
?line ?t:fail()
end,
ok.
calls(0, _) -> ok;
calls(N, Pid) ->
{ultimate_answer,42} = call(Pid, {ultimate_answer,42}),
calls(N-1, Pid).
call(Pid, Msg) ->
gen_server:call(Pid, Msg, infinity).
tc(Fun) ->
timer:tc(erlang, apply, [Fun,[]]).
echo_loop() ->
receive
{'$gen_call',{Pid,Ref},Msg} ->
Pid ! {Ref,Msg},
echo_loop()
end.
%%--------------------------------------------------------------
%% Help functions to spec_init_*
start_link(Init, Options) ->
proc_lib:start_link(?MODULE, Init, Options).
spec_init_local({ok, Name}, Options) ->
process_flag(trap_exit, true),
register(Name, self()),
proc_lib:init_ack({ok, self()}),
%% Supervised init can occur here ...
gen_server:enter_loop(?MODULE, Options, {}, {local, Name}, infinity);
spec_init_local({not_ok, Name}, Options) ->
process_flag(trap_exit, true),
proc_lib:init_ack({ok, self()}),
%% Supervised init can occur here ...
gen_server:enter_loop(?MODULE, Options, {}, {local, Name}, infinity).
spec_init_global({ok, Name}, Options) ->
process_flag(trap_exit, true),
global:register_name(Name, self()),
proc_lib:init_ack({ok, self()}),
%% Supervised init can occur here ...
gen_server:enter_loop(?MODULE, Options, {}, {global, Name}, infinity);
spec_init_global({not_ok, Name}, Options) ->
process_flag(trap_exit, true),
proc_lib:init_ack({ok, self()}),
%% Supervised init can occur here ...
gen_server:enter_loop(?MODULE, Options, {}, {global, Name}, infinity).
spec_init_via({ok, Name}, Options) ->
process_flag(trap_exit, true),
dummy_via:register_name(Name, self()),
proc_lib:init_ack({ok, self()}),
%% Supervised init can occur here ...
gen_server:enter_loop(?MODULE, Options, {},
{via, dummy_via, Name}, infinity);
spec_init_via({not_ok, Name}, Options) ->
process_flag(trap_exit, true),
proc_lib:init_ack({ok, self()}),
%% Supervised init can occur here ...
gen_server:enter_loop(?MODULE, Options, {},
{via, dummy_via, Name}, infinity).
spec_init_default_timeout({ok, Name}, Options) ->
process_flag(trap_exit, true),
register(Name, self()),
proc_lib:init_ack({ok, self()}),
%% Supervised init can occur here ...
gen_server:enter_loop(?MODULE, Options, {}, {local, Name}).
%% OTP-10130, A bug was introduced where global scope was not matched when
%% enter_loop/4 was called (no timeout).
spec_init_global_default_timeout({ok, Name}, Options) ->
process_flag(trap_exit, true),
global:register_name(Name, self()),
proc_lib:init_ack({ok, self()}),
%% Supervised init can occur here ...
gen_server:enter_loop(?MODULE, Options, {}, {global, Name}).
spec_init_anonymous(Options) ->
process_flag(trap_exit, true),
proc_lib:init_ack({ok, self()}),
%% Supervised init can occur here ...
gen_server:enter_loop(?MODULE, Options, {}, infinity).
spec_init_anonymous_default_timeout(Options) ->
process_flag(trap_exit, true),
proc_lib:init_ack({ok, self()}),
%% Supervised init can occur here ...
gen_server:enter_loop(?MODULE, Options, {}).
spec_init_not_proc_lib(Options) ->
gen_server:enter_loop(?MODULE, Options, {}, infinity).
%%% --------------------------------------------------------
%%% Here is the tested gen_server behaviour.
%%% --------------------------------------------------------
init([]) ->
{ok, []};
init(ignore) ->
ignore;
init(stop) ->
{stop, stopped};
init(hibernate) ->
{ok,[],hibernate};
init(sleep) ->
test_server:sleep(1000),
{ok, []};
init({state,State}) ->
{ok, State}.
handle_call(started_p, _From, State) ->
io:format("FROZ"),
{reply,ok,State};
handle_call({delayed_answer, T}, From, _State) ->
{noreply,{reply_to,From},T};
handle_call({call_within, T}, _From, _) ->
{reply,ok,call_within,T};
handle_call(next_call, _From, call_within) ->
{reply,ok,[]};
handle_call(next_call, _From, State) ->
{reply,false,State};
handle_call(badreturn, _From, _State) ->
badreturn;
handle_call(hibernate, _From, _State) ->
{reply,true,[],hibernate};
handle_call({hibernate_noreply,Pid}, From, _State) ->
Pid ! go,
{noreply,From,hibernate};
handle_call(stop, _From, State) ->
{stop,stopped,ok,State};
handle_call(crash, _From, _State) ->
exit(crashed);
handle_call(exit_shutdown, _From, _State) ->
exit(shutdown);
handle_call(stop_shutdown, _From, State) ->
{stop,shutdown,State};
handle_call(shutdown_reason, _From, _State) ->
exit({shutdown,reason});
handle_call(stop_shutdown_reason, _From, State) ->
{stop,{shutdown,stop_reason},State}.
handle_cast({From,handle_cast}, State) ->
From ! {self(), handled_cast},
{noreply, State};
handle_cast({From,delayed_cast,T}, _State) ->
{noreply, {delayed_cast,From}, T};
handle_cast(hibernate_now, _State) ->
{noreply, [], hibernate};
handle_cast(hibernate_later, _State) ->
timer:send_after(1000,self(),hibernate_now),
{noreply, []};
handle_cast({From, stop}, State) ->
io:format("BAZ"),
{stop, {From,stopped}, State}.
handle_info(timeout, {reply_to, From}) ->
gen_server:reply(From, delayed),
{noreply, []};
handle_info(timeout, hibernate_me) -> % Arrive here from
% handle_info(hibernate_later,...)
{noreply, [], hibernate};
handle_info(hibernate_now, _State) -> % Arrive here from
% handle_cast({_,hibernate_later},...)
% and by direct ! from testcase
{noreply, [], hibernate};
handle_info(hibernate_later, _State) ->
{noreply, hibernate_me, 1000};
handle_info(timeout, call_within) ->
{noreply, []};
handle_info(timeout, {delayed_cast, From}) ->
From ! {self(), delayed},
{noreply, []};
handle_info(timeout, {delayed_info, From}) ->
From ! {self(), delayed_info},
{noreply, []};
handle_info({From, handle_info}, _State) ->
From ! {self(), handled_info},
{noreply, []};
handle_info({From, delayed_info, T}, _State) ->
{noreply, {delayed_info, From}, T};
handle_info(continue, From) ->
gen_server:reply(From,true),
{noreply, []};
handle_info({From, stop}, State) ->
{stop, {From,stopped_info}, State};
handle_info(_Info, State) ->
{noreply, State}.
terminate({From, stopped}, _State) ->
io:format("FOOBAR"),
From ! {self(), stopped},
ok;
terminate({From, stopped_info}, _State) ->
From ! {self(), stopped_info},
ok;
terminate(_Reason, _State) ->
ok.
format_status(terminate, [_PDict, State]) ->
State;
format_status(normal, [_PDict, _State]) ->
format_status_called.
