diff options
Diffstat (limited to 'lib/stdlib/test')
| -rw-r--r-- | lib/stdlib/test/supervisor_SUITE.erl | 52 | ||||
| -rw-r--r-- | lib/stdlib/test/supervisor_deadlock.erl | 14 |
2 files changed, 62 insertions, 4 deletions
diff --git a/lib/stdlib/test/supervisor_SUITE.erl b/lib/stdlib/test/supervisor_SUITE.erl index 8cb2a5194a..903ca76575 100644 --- a/lib/stdlib/test/supervisor_SUITE.erl +++ b/lib/stdlib/test/supervisor_SUITE.erl @@ -67,6 +67,7 @@ %% Misc tests -export([child_unlink/1, tree/1, count_children/1, + count_restarting_children/1, 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, @@ -90,7 +91,8 @@ all() -> {group, normal_termination}, {group, shutdown_termination}, {group, abnormal_termination}, child_unlink, tree, - count_children, do_not_save_start_parameters_for_temporary_children, + count_children, count_restarting_children, + 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, hanging_restart_loop, hanging_restart_loop_simple, @@ -1459,6 +1461,54 @@ count_children(Config) when is_list(Config) -> [1,0,0,0] = get_child_counts(sup_test). %%------------------------------------------------------------------------- +%% Test count_children when some children are restarting +count_restarting_children(Config) when is_list(Config) -> + process_flag(trap_exit, true), + Child = {child, {supervisor_deadlock, start_child_noreg, []}, + permanent, brutal_kill, worker, []}, + %% 2 sek delay on failing restart (see supervisor_deadlock.erl) -> + %% MaxR=20, MaxT=10 should ensure a restart loop when starting and + %% restarting 3 instances of the child (as below) + {ok, SupPid} = start_link({ok, {{simple_one_for_one, 20, 10}, [Child]}}), + + %% Ets table with state read by supervisor_deadlock.erl + ets:new(supervisor_deadlock,[set,named_table,public]), + ets:insert(supervisor_deadlock,{fail_start,false}), + + [1,0,0,0] = get_child_counts(SupPid), + {ok, Ch1_1} = supervisor:start_child(SupPid, []), + [1,1,0,1] = get_child_counts(SupPid), + {ok, Ch1_2} = supervisor:start_child(SupPid, []), + [1,2,0,2] = get_child_counts(SupPid), + {ok, Ch1_3} = supervisor:start_child(SupPid, []), + [1,3,0,3] = get_child_counts(SupPid), + + supervisor_deadlock:restart_child(Ch1_1), + supervisor_deadlock:restart_child(Ch1_2), + supervisor_deadlock:restart_child(Ch1_3), + test_server:sleep(400), + [1,3,0,3] = get_child_counts(SupPid), + [Ch2_1, Ch2_2, Ch2_3] = [C || {_,C,_,_} <- supervisor:which_children(SupPid)], + + ets:insert(supervisor_deadlock,{fail_start,true}), + supervisor_deadlock:restart_child(Ch2_1), + supervisor_deadlock:restart_child(Ch2_2), + test_server:sleep(4000), % allow restart to happen before proceeding + [1,1,0,3] = get_child_counts(SupPid), + + ets:insert(supervisor_deadlock,{fail_start,false}), + test_server:sleep(4000), % allow restart to happen before proceeding + [1,3,0,3] = get_child_counts(SupPid), + + ok = supervisor:terminate_child(SupPid, Ch2_3), + [1,2,0,2] = get_child_counts(SupPid), + [Ch3_1, Ch3_2] = [C || {_,C,_,_} <- supervisor:which_children(SupPid)], + ok = supervisor:terminate_child(SupPid, Ch3_1), + [1,1,0,1] = get_child_counts(SupPid), + ok = supervisor:terminate_child(SupPid, Ch3_2), + [1,0,0,0] = get_child_counts(SupPid). + +%%------------------------------------------------------------------------- %% Temporary children shall not be restarted so they should not save %% start parameters, as it potentially can take up a huge amount of %% memory for no purpose. diff --git a/lib/stdlib/test/supervisor_deadlock.erl b/lib/stdlib/test/supervisor_deadlock.erl index 288547a972..8d3d1c6f30 100644 --- a/lib/stdlib/test/supervisor_deadlock.erl +++ b/lib/stdlib/test/supervisor_deadlock.erl @@ -11,9 +11,11 @@ init([child]) -> %% 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 + %% A restart frequency of MaxR=8, MaxT=10 should ensure + %% that restart intensity is not reached -> restart loop. + %% (Note that if we use simple_one_for_one, and start + %% 'many' child instances, the restart frequency must be + %% ajusted accordingly.) timer:sleep(2000), % NOTE: this could be a gen_server call timeout {stop, error} @@ -41,5 +43,11 @@ code_change(_OldVsn, State, _Extra) -> start_child() -> gen_server:start_link({local, ?MODULE}, ?MODULE, [child], []). +start_child_noreg() -> + gen_server:start_link(?MODULE, [child], []). + restart_child() -> gen_server:cast(supervisor_deadlock, restart). + +restart_child(Pid) -> + gen_server:cast(Pid, restart). |