diff options
Diffstat (limited to 'lib/stdlib/test')
| -rw-r--r-- | lib/stdlib/test/Makefile | 2 | ||||
| -rw-r--r-- | lib/stdlib/test/digraph_utils_SUITE.erl | 5 | ||||
| -rw-r--r-- | lib/stdlib/test/dummy_via.erl | 94 | ||||
| -rw-r--r-- | lib/stdlib/test/gen_event_SUITE.erl | 26 | ||||
| -rw-r--r-- | lib/stdlib/test/gen_fsm_SUITE.erl | 71 | ||||
| -rw-r--r-- | lib/stdlib/test/gen_server_SUITE.erl | 62 | ||||
| -rw-r--r-- | lib/stdlib/test/supervisor_SUITE.erl | 122 | ||||
| -rw-r--r-- | lib/stdlib/test/supervisor_deadlock.erl | 45 |
8 files changed, 399 insertions, 28 deletions
diff --git a/lib/stdlib/test/Makefile b/lib/stdlib/test/Makefile index aa6a660c34..4de6ea3ee7 100644 --- a/lib/stdlib/test/Makefile +++ b/lib/stdlib/test/Makefile @@ -20,6 +20,7 @@ MODULES= \ digraph_utils_SUITE \ dummy1_h \ dummy_h \ + dummy_via \ edlin_expand_SUITE \ epp_SUITE \ erl_eval_helper \ @@ -66,6 +67,7 @@ MODULES= \ string_SUITE \ supervisor_1 \ supervisor_2 \ + supervisor_deadlock \ naughty_child \ shell_SUITE \ supervisor_SUITE \ diff --git a/lib/stdlib/test/digraph_utils_SUITE.erl b/lib/stdlib/test/digraph_utils_SUITE.erl index 12c486c25f..6b554c2fb7 100644 --- a/lib/stdlib/test/digraph_utils_SUITE.erl +++ b/lib/stdlib/test/digraph_utils_SUITE.erl @@ -1,7 +1,7 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 2000-2011. All Rights Reserved. +%% Copyright Ericsson AB 2000-2012. 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 @@ -211,8 +211,7 @@ condensation(Config) when is_list(Config) -> {lists:sort(V1), lists:sort(V2)} end, ?line Es = lists:map(Fun, digraph:edges(CG)), - ?line [{[b],[c]},{[b],[d]},{[e,f,g],[e,f,g]},{[h],[h]},{[i,j],[i,j]}] = - lists:sort(Es), + ?line [{[b],[c]},{[b],[d]}] = lists:sort(Es), ?line true = digraph:delete(CG), ?line true = digraph:delete(G), ok. diff --git a/lib/stdlib/test/dummy_via.erl b/lib/stdlib/test/dummy_via.erl new file mode 100644 index 0000000000..e405811cbe --- /dev/null +++ b/lib/stdlib/test/dummy_via.erl @@ -0,0 +1,94 @@ +-module(dummy_via). +-export([reset/0, + register_name/2, + whereis_name/1, + unregister_name/1, + send/2]). + + +reset() -> + P = whereis(?MODULE), + catch unlink(P), + Ref = erlang:monitor(process, P), + catch exit(P, kill), + receive {'DOWN',Ref,_,_,_} -> ok end, + Me = self(), + Pid = spawn_link(fun() -> + register(?MODULE, self()), + Me ! {self(), started}, + loop([]) + end), + receive + {Pid, started} -> + Pid + after 10000 -> + exit(timeout) + end. + +register_name(Name, Pid) when is_pid(Pid) -> + call({register_name, Name, Pid}). + +unregister_name(Name) -> + call({unregister_name, Name}). + +whereis_name(Name) -> + call({whereis_name, Name}). + +send(Name, Msg) -> + case whereis_name(Name) of + undefined -> + exit({badarg, {Name, Msg}}); + Pid when is_pid(Pid) -> + Pid ! Msg, + Pid + end. + +call(Req) -> + MRef = erlang:monitor(process, ?MODULE), + ?MODULE ! {self(), MRef, Req}, + receive + {'DOWN', MRef, _, _, _} -> + erlang:error(badarg); + {MRef, badarg} -> + erlang:error(badarg); + {MRef, Reply} -> + Reply + after 5000 -> + erlang:error(timeout) + end. + +loop(Reg) -> + receive + {'DOWN', _, _, P, _} when is_pid(P) -> + loop([X || {_,Pid,_} = X <- Reg, Pid =/= P]); + {From, Ref, Request} when is_pid(From), is_reference(Ref) -> + {Reply, NewReg} = handle_request(Request, Reg), + From ! {Ref, Reply}, + loop(NewReg) + end. + +handle_request({register_name, Name, Pid}, Reg) when is_pid(Pid) -> + case lists:keyfind(Name, 1, Reg) of + false -> + Ref = erlang:monitor(process, Pid), + {yes, [{Name, Pid, Ref}|Reg]}; + _ -> + {no, Reg} + end; +handle_request({whereis_name, Name}, Reg) -> + case lists:keyfind(Name, 1, Reg) of + {_, Pid, _} -> + {Pid, Reg}; + false -> + {undefined, Reg} + end; +handle_request({unregister_name, Name}, Reg) -> + case lists:keyfind(Name, 1, Reg) of + {_, _, Ref} -> + catch erlang:demonitor(Ref); + _ -> + ok + end, + {ok, lists:keydelete(Name, 1, Reg)}; +handle_request(_, Reg) -> + {badarg, Reg}. diff --git a/lib/stdlib/test/gen_event_SUITE.erl b/lib/stdlib/test/gen_event_SUITE.erl index b3a7edc140..5c51e12e35 100644 --- a/lib/stdlib/test/gen_event_SUITE.erl +++ b/lib/stdlib/test/gen_event_SUITE.erl @@ -62,6 +62,8 @@ start(suite) -> []; start(Config) when is_list(Config) -> OldFl = process_flag(trap_exit, true), + ?line dummy_via:reset(), + ?line {ok, Pid0} = gen_event:start(), %anonymous ?line [] = gen_event:which_handlers(Pid0), ?line ok = gen_event:stop(Pid0), @@ -85,6 +87,11 @@ start(Config) when is_list(Config) -> ?line [] = gen_event:which_handlers(Pid4), ?line ok = gen_event:stop({global, my_dummy_name}), + ?line {ok, Pid5} = gen_event:start_link({via, dummy_via, my_dummy_name}), + ?line [] = gen_event:which_handlers({via, dummy_via, my_dummy_name}), + ?line [] = gen_event:which_handlers(Pid5), + ?line ok = gen_event:stop({via, dummy_via, my_dummy_name}), + ?line {ok, _} = gen_event:start_link({local, my_dummy_name}), ?line {error, {already_started, _}} = gen_event:start_link({local, my_dummy_name}), @@ -92,15 +99,28 @@ start(Config) when is_list(Config) -> gen_event:start({local, my_dummy_name}), ?line ok = gen_event:stop(my_dummy_name), - ?line {ok, Pid5} = gen_event:start_link({global, my_dummy_name}), + ?line {ok, Pid6} = gen_event:start_link({global, my_dummy_name}), ?line {error, {already_started, _}} = gen_event:start_link({global, my_dummy_name}), ?line {error, {already_started, _}} = gen_event:start({global, my_dummy_name}), - exit(Pid5, shutdown), + exit(Pid6, shutdown), + receive + {'EXIT', Pid6, shutdown} -> ok + after 10000 -> + ?t:fail(exit_gen_event) + end, + + ?line {ok, Pid7} = gen_event:start_link({via, dummy_via, my_dummy_name}), + ?line {error, {already_started, _}} = + gen_event:start_link({via, dummy_via, my_dummy_name}), + ?line {error, {already_started, _}} = + gen_event:start({via, dummy_via, my_dummy_name}), + + exit(Pid7, shutdown), receive - {'EXIT', Pid5, shutdown} -> ok + {'EXIT', Pid7, shutdown} -> ok after 10000 -> ?t:fail(exit_gen_event) end, diff --git a/lib/stdlib/test/gen_fsm_SUITE.erl b/lib/stdlib/test/gen_fsm_SUITE.erl index d60629d841..bdb4ea65b5 100644 --- a/lib/stdlib/test/gen_fsm_SUITE.erl +++ b/lib/stdlib/test/gen_fsm_SUITE.erl @@ -21,11 +21,11 @@ -include_lib("test_server/include/test_server.hrl"). %% Test cases --export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1, +-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1, init_per_group/2,end_per_group/2]). --export([ start1/1, start2/1, start3/1, start4/1 , start5/1, start6/1, - start7/1, start8/1, start9/1, start10/1, start11/1]). +-export([start1/1, start2/1, start3/1, start4/1, start5/1, start6/1, + start7/1, start8/1, start9/1, start10/1, start11/1, start12/1]). -export([ abnormal1/1, abnormal2/1]). @@ -56,14 +56,14 @@ suite() -> [{ct_hooks,[ts_install_cth]}]. -all() -> +all() -> [{group, start}, {group, abnormal}, shutdown, {group, sys}, hibernate, enter_loop]. -groups() -> +groups() -> [{start, [], [start1, start2, start3, start4, start5, start6, start7, - start8, start9, start10, start11]}, + start8, start9, start10, start11, start12]}, {abnormal, [], [abnormal1, abnormal2]}, {sys, [], [sys1, call_format_status, error_format_status]}]. @@ -258,6 +258,25 @@ start11(Config) when is_list(Config) -> test_server:messages_get(), ok. +%% Via register linked +start12(Config) when is_list(Config) -> + ?line dummy_via:reset(), + ?line {ok, Pid} = + gen_fsm:start_link({via, dummy_via, my_fsm}, gen_fsm_SUITE, [], []), + ?line {error, {already_started, Pid}} = + gen_fsm:start_link({via, dummy_via, my_fsm}, gen_fsm_SUITE, [], []), + ?line {error, {already_started, Pid}} = + gen_fsm:start({via, dummy_via, my_fsm}, gen_fsm_SUITE, [], []), + + ?line ok = do_func_test(Pid), + ?line ok = do_sync_func_test(Pid), + ?line ok = do_func_test({via, dummy_via, my_fsm}), + ?line ok = do_sync_func_test({via, dummy_via, my_fsm}), + ?line stop_it({via, dummy_via, my_fsm}), + + test_server:messages_get(), + ok. + %% Check that time outs in calls work abnormal1(suite) -> []; @@ -362,7 +381,25 @@ call_format_status(Config) when is_list(Config) -> ?line Status4 = sys:get_status(GlobalName2), ?line {status, Pid4, _Mod, [_PDict4, running, _, _, Data4]} = Status4, ?line [format_status_called | _] = lists:reverse(Data4), - ?line stop_it(Pid4). + ?line stop_it(Pid4), + + %% check that format_status can handle a name being a term other than a + %% pid or atom + ?line dummy_via:reset(), + ViaName1 = {via, dummy_via, "CallFormatStatus"}, + ?line {ok, Pid5} = gen_fsm:start(ViaName1, gen_fsm_SUITE, [], []), + ?line Status5 = sys:get_status(ViaName1), + ?line {status, Pid5, _Mod, [_PDict5, running, _, _, Data5]} = Status5, + ?line [format_status_called | _] = lists:reverse(Data5), + ?line stop_it(Pid5), + ViaName2 = {via, dummy_via, {name, "term"}}, + ?line {ok, Pid6} = gen_fsm:start(ViaName2, gen_fsm_SUITE, [], []), + ?line Status6 = sys:get_status(ViaName2), + ?line {status, Pid6, _Mod, [_PDict6, running, _, _, Data6]} = Status6, + ?line [format_status_called | _] = lists:reverse(Data6), + ?line stop_it(Pid6). + + error_format_status(Config) when is_list(Config) -> ?line error_logger_forwarder:register(), @@ -520,6 +557,8 @@ enter_loop(doc) -> enter_loop(Config) when is_list(Config) -> OldFlag = process_flag(trap_exit, true), + ?line dummy_via:reset(), + %% Locally registered process + {local, Name} ?line {ok, Pid1a} = proc_lib:start_link(?MODULE, enter_loop, [local, local]), @@ -623,10 +662,22 @@ enter_loop(Config) when is_list(Config) -> {'EXIT', Pid6b, process_not_registered_globally} -> ok after 1000 -> - ?line test_server:fail(gen_server_started) + ?line test_server:fail(gen_fsm_started) end, global:unregister_name(armitage), + dummy_via:register_name(armitage, self()), + ?line {ok, Pid6c} = + proc_lib:start_link(?MODULE, enter_loop, [anon, via]), + receive + {'EXIT', Pid6c, {process_not_registered_via, dummy_via}} -> + ok + after 1000 -> + ?line test_server:fail({gen_fsm_started, process_info(self(), + messages)}) + end, + dummy_via:unregister_name(armitage), + process_flag(trap_exit, OldFlag), ok. @@ -635,6 +686,7 @@ enter_loop(Reg1, Reg2) -> case Reg1 of local -> register(armitage, self()); global -> global:register_name(armitage, self()); + via -> dummy_via:register_name(armitage, self()); anon -> ignore end, proc_lib:init_ack({ok, self()}), @@ -643,6 +695,9 @@ enter_loop(Reg1, Reg2) -> gen_fsm:enter_loop(?MODULE, [], state0, [], {local,armitage}); global -> gen_fsm:enter_loop(?MODULE, [], state0, [], {global,armitage}); + via -> + gen_fsm:enter_loop(?MODULE, [], state0, [], + {via, dummy_via, armitage}); anon -> gen_fsm:enter_loop(?MODULE, [], state0, []) end. diff --git a/lib/stdlib/test/gen_server_SUITE.erl b/lib/stdlib/test/gen_server_SUITE.erl index 7fb8d54f2d..cdf15ba017 100644 --- a/lib/stdlib/test/gen_server_SUITE.erl +++ b/lib/stdlib/test/gen_server_SUITE.erl @@ -36,7 +36,7 @@ ]). % spawn export --export([spec_init_local/2, spec_init_global/2, +-export([spec_init_local/2, spec_init_global/2, spec_init_via/2, spec_init_default_timeout/2, spec_init_anonymous/1, spec_init_anonymous_default_timeout/1, spec_init_not_proc_lib/1, cast_fast_messup/0]). @@ -199,6 +199,35 @@ start(Config) when is_list(Config) -> 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(), %% Must wait for all error messages before going to next test. @@ -853,6 +882,8 @@ otp_5854(doc) -> 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 @@ -881,6 +912,18 @@ otp_5854(Config) when is_list(Config) -> 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. @@ -1060,7 +1103,22 @@ spec_init_global({not_ok, Name}, Options) -> %% Supervised init can occur here ... gen_server:enter_loop(?MODULE, Options, {}, {global, Name}, infinity). -spec_init_default_timeout({ok, Name}, Options) -> +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()}), diff --git a/lib/stdlib/test/supervisor_SUITE.erl b/lib/stdlib/test/supervisor_SUITE.erl index 71b76c093f..767ae3d62c 100644 --- a/lib/stdlib/test/supervisor_SUITE.erl +++ b/lib/stdlib/test/supervisor_SUITE.erl @@ -21,7 +21,7 @@ -module(supervisor_SUITE). -include_lib("common_test/include/ct.hrl"). --define(TIMEOUT, 1000). +-define(TIMEOUT, ?t:minutes(1)). %% Testserver specific export -export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1, @@ -62,7 +62,8 @@ do_not_save_start_parameters_for_temporary_children/1, do_not_save_child_specs_for_temporary_children/1, simple_one_for_one_scale_many_temporary_children/1, - simple_global_supervisor/1]). + simple_global_supervisor/1, hanging_restart_loop/1, + hanging_restart_loop_simple/1]). %%------------------------------------------------------------------------- @@ -82,7 +83,7 @@ all() -> count_children_memory, do_not_save_start_parameters_for_temporary_children, do_not_save_child_specs_for_temporary_children, simple_one_for_one_scale_many_temporary_children, temporary_bystander, - simple_global_supervisor]. + simple_global_supervisor, hanging_restart_loop, hanging_restart_loop_simple]. groups() -> [{sup_start, [], @@ -111,10 +112,8 @@ groups() -> {restart_rest_for_one, [], [rest_for_one, rest_for_one_escalation]}]. -init_per_suite(Config0) -> - Config = lists:keydelete(watchdog, 1, Config0), - Dog = test_server:timetrap(?TIMEOUT), - [{watchdog, Dog} | Config]. +init_per_suite(Config) -> + Config. end_per_suite(_Config) -> ok. @@ -129,18 +128,21 @@ init_per_testcase(count_children_memory, Config) -> try erlang:memory() of _ -> erts_debug:set_internal_state(available_internal_state, true), - Config + Dog = ?t:timetrap(?TIMEOUT), + [{watchdog,Dog}|Config] catch error:notsup -> {skip, "+Meamin used during test; erlang:memory/1 not available"} end; init_per_testcase(_Case, Config) -> - erlang:display(_Case), - Config. + Dog = ?t:timetrap(?TIMEOUT), + [{watchdog,Dog}|Config]. -end_per_testcase(count_children_memory, _Config) -> +end_per_testcase(count_children_memory, Config) -> catch erts_debug:set_internal_state(available_internal_state, false), + ?t:timetrap_cancel(?config(watchdog,Config)), ok; -end_per_testcase(_Case, _Config) -> +end_per_testcase(_Case, Config) -> + ?t:timetrap_cancel(?config(watchdog,Config)), ok. start_link(InitResult) -> @@ -1455,6 +1457,102 @@ gen_server9212() -> %%------------------------------------------------------------------------- +%% Test that child and supervisor can be shutdown while hanging in restart loop. +%% See OTP-9549. +hanging_restart_loop(Config) when is_list(Config) -> + process_flag(trap_exit, true), + {ok, Pid} = start_link({ok, {{one_for_one, 8, 10}, []}}), + Child1 = {child1, {supervisor_deadlock, start_child, []}, + permanent, brutal_kill, worker, []}, + + %% Ets table with state read by supervisor_deadlock.erl + ets:new(supervisor_deadlock,[set,named_table,public]), + ets:insert(supervisor_deadlock,{fail_start,false}), + + {ok, CPid1} = supervisor:start_child(sup_test, Child1), + link(CPid1), + + ets:insert(supervisor_deadlock,{fail_start,true}), + supervisor_deadlock:restart_child(), + timer:sleep(2000), % allow restart to happen before proceeding + + {error, already_present} = supervisor:start_child(sup_test, Child1), + {error, restarting} = supervisor:restart_child(sup_test, child1), + {error, restarting} = supervisor:delete_child(sup_test, child1), + [{child1,restarting,worker,[]}] = supervisor:which_children(sup_test), + [1,0,0,1] = get_child_counts(sup_test), + + ok = supervisor:terminate_child(sup_test, child1), + check_exit_reason(CPid1, error), + [{child1,undefined,worker,[]}] = supervisor:which_children(sup_test), + + ets:insert(supervisor_deadlock,{fail_start,false}), + {ok, CPid2} = supervisor:restart_child(sup_test, child1), + link(CPid2), + + ets:insert(supervisor_deadlock,{fail_start,true}), + supervisor_deadlock:restart_child(), + timer:sleep(2000), % allow restart to happen before proceeding + + %% Terminating supervisor. + %% OTP-9549 fixes so this does not give a timetrap timeout - + %% i.e. that supervisor does not hang in restart loop. + terminate(Pid,shutdown), + + %% Check that child died with reason from 'restart' request above + check_exit_reason(CPid2, error), + undefined = whereis(sup_test), + ok. + +%%------------------------------------------------------------------------- +%% Test that child and supervisor can be shutdown while hanging in +%% restart loop, simple_one_for_one. +%% See OTP-9549. +hanging_restart_loop_simple(Config) when is_list(Config) -> + process_flag(trap_exit, true), + Child1 = {child1, {supervisor_deadlock, start_child, []}, + permanent, brutal_kill, worker, []}, + {ok, Pid} = start_link({ok, {{simple_one_for_one, 8, 10}, [Child1]}}), + + %% Ets table with state read by supervisor_deadlock.erl + ets:new(supervisor_deadlock,[set,named_table,public]), + ets:insert(supervisor_deadlock,{fail_start,false}), + + {ok, CPid1} = supervisor:start_child(sup_test, []), + link(CPid1), + + ets:insert(supervisor_deadlock,{fail_start,true}), + supervisor_deadlock:restart_child(), + timer:sleep(2000), % allow restart to happen before proceeding + + {error, simple_one_for_one} = supervisor:restart_child(sup_test, child1), + {error, simple_one_for_one} = supervisor:delete_child(sup_test, child1), + [{undefined,restarting,worker,[]}] = supervisor:which_children(sup_test), + [1,0,0,1] = get_child_counts(sup_test), + + ok = supervisor:terminate_child(sup_test, CPid1), + check_exit_reason(CPid1, error), + [] = supervisor:which_children(sup_test), + + ets:insert(supervisor_deadlock,{fail_start,false}), + {ok, CPid2} = supervisor:start_child(sup_test, []), + link(CPid2), + + ets:insert(supervisor_deadlock,{fail_start,true}), + supervisor_deadlock:restart_child(), + timer:sleep(2000), % allow restart to happen before proceeding + + %% Terminating supervisor. + %% OTP-9549 fixes so this does not give a timetrap timeout - + %% i.e. that supervisor does not hang in restart loop. + terminate(Pid,shutdown), + + %% Check that child died with reason from 'restart' request above + check_exit_reason(CPid2, error), + undefined = whereis(sup_test), + ok. + +%%------------------------------------------------------------------------- terminate(Pid, Reason) when Reason =/= supervisor -> terminate(dummy, Pid, dummy, Reason). diff --git a/lib/stdlib/test/supervisor_deadlock.erl b/lib/stdlib/test/supervisor_deadlock.erl new file mode 100644 index 0000000000..288547a972 --- /dev/null +++ b/lib/stdlib/test/supervisor_deadlock.erl @@ -0,0 +1,45 @@ +-module(supervisor_deadlock). +-compile(export_all). + + +%%%----------------------------------------------------------------- +%%% gen_server callbacks +init([child]) -> + case ets:lookup(supervisor_deadlock,fail_start) of + [{fail_start, false}] -> + %% we must not fail on the first init, otherwise supervisor + %% terminates immediately + {ok, []}; + [{fail_start, true}] -> + %% Restart frequency is MaxR=8, MaxT=10, so this will + %% ensure that restart intensity is not reached -> restart + %% loop + timer:sleep(2000), % NOTE: this could be a gen_server call timeout + + {stop, error} + end. + +handle_call(_Req, _From, State) -> + {reply, ok, State}. + +%% Force a restart +handle_cast(restart, State) -> + {stop, error, State}. + +handle_info(_Msg, State) -> + {noreply, State}. + +terminate(_Reason, _State) -> + ok. + +code_change(_OldVsn, State, _Extra) -> + {ok, State}. + + +%%%----------------------------------------------------------------- +%%% Start child +start_child() -> + gen_server:start_link({local, ?MODULE}, ?MODULE, [child], []). + +restart_child() -> + gen_server:cast(supervisor_deadlock, restart). |