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-rw-r--r--lib/stdlib/src/supervisor.erl2
-rw-r--r--lib/stdlib/test/supervisor_SUITE.erl86
2 files changed, 85 insertions, 3 deletions
diff --git a/lib/stdlib/src/supervisor.erl b/lib/stdlib/src/supervisor.erl
index 469063689d..3c5800effa 100644
--- a/lib/stdlib/src/supervisor.erl
+++ b/lib/stdlib/src/supervisor.erl
@@ -40,7 +40,7 @@
%%--------------------------------------------------------------------------
-type child_id() :: pid() | 'undefined'.
--type mfargs() :: {module(), atom(), [term()]}.
+-type mfargs() :: {module(), atom(), [term()] | undefined}.
-type modules() :: [module()] | 'dynamic'.
-type restart() :: 'permanent' | 'transient' | 'temporary'.
-type shutdown() :: 'brutal_kill' | timeout().
diff --git a/lib/stdlib/test/supervisor_SUITE.erl b/lib/stdlib/test/supervisor_SUITE.erl
index 4708658a6d..4ee323ee62 100644
--- a/lib/stdlib/test/supervisor_SUITE.erl
+++ b/lib/stdlib/test/supervisor_SUITE.erl
@@ -50,7 +50,8 @@
simple_one_for_one_extra/1]).
%% Misc tests
--export([child_unlink/1, tree/1, count_children_memory/1]).
+-export([child_unlink/1, tree/1, count_children_memory/1,
+ do_not_save_start_parameters_for_temporary_children/1]).
%-------------------------------------------------------------------------
@@ -61,7 +62,7 @@ all(suite) ->
restart_one_for_one, restart_one_for_all,
restart_simple_one_for_one, restart_rest_for_one,
normal_termination, abnormal_termination, child_unlink, tree,
- count_children_memory]}.
+ count_children_memory, do_not_save_start_parameters_for_temporary_children]}.
start(InitResult) ->
@@ -1340,3 +1341,84 @@ count_children_memory(Config) when is_list(Config) ->
test_server:sleep(100),
?line [1,0,0,0] = get_child_counts(sup_test),
ok.
+%-------------------------------------------------------------------------
+do_not_save_start_parameters_for_temporary_children(doc) ->
+ ["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."];
+do_not_save_start_parameters_for_temporary_children(suite) ->
+ [];
+do_not_save_start_parameters_for_temporary_children(Config) when is_list(Config) ->
+ process_flag(trap_exit, true),
+ dont_save_start_parameters_for_temporary_children(one_for_all),
+ dont_save_start_parameters_for_temporary_children(one_for_one),
+ dont_save_start_parameters_for_temporary_children(rest_for_one),
+ dont_save_start_parameters_for_temporary_children(simple_one_for_one).
+
+dont_save_start_parameters_for_temporary_children(simple_one_for_one = Type) ->
+ Permanent = {child, {supervisor_1, start_child, []},
+ permanent, 1000, worker, []},
+ Transient = {child, {supervisor_1, start_child, []},
+ transient, 1000, worker, []},
+ Temporary = {child, {supervisor_1, start_child, []},
+ temporary, 1000, worker, []},
+ {ok, Sup1} = supervisor:start_link(?MODULE, {ok, {{Type, 2, 3600}, [Permanent]}}),
+ {ok, Sup2} = supervisor:start_link(?MODULE, {ok, {{Type, 2, 3600}, [Transient]}}),
+ {ok, Sup3} = supervisor:start_link(?MODULE, {ok, {{Type, 2, 3600}, [Temporary]}}),
+
+ LargeList = lists:duplicate(10, "Potentially large"),
+
+ start_children(Sup1, [LargeList], 100),
+ start_children(Sup2, [LargeList], 100),
+ start_children(Sup3, [LargeList], 100),
+
+ [{memory,Mem1}] = process_info(Sup1, [memory]),
+ [{memory,Mem2}] = process_info(Sup2, [memory]),
+ [{memory,Mem3}] = process_info(Sup3, [memory]),
+
+ true = (Mem3 < Mem1) and (Mem3 < Mem2),
+
+ exit(Sup1, shutdown),
+ exit(Sup2, shutdown),
+ exit(Sup3, shutdown);
+
+dont_save_start_parameters_for_temporary_children(Type) ->
+ {ok, Sup1} = supervisor:start_link(?MODULE, {ok, {{Type, 2, 3600}, []}}),
+ {ok, Sup2} = supervisor:start_link(?MODULE, {ok, {{Type, 2, 3600}, []}}),
+ {ok, Sup3} = supervisor:start_link(?MODULE, {ok, {{Type, 2, 3600}, []}}),
+
+ LargeList = lists:duplicate(10, "Potentially large"),
+
+ Permanent = {child1, {supervisor_1, start_child, [LargeList]},
+ permanent, 1000, worker, []},
+ Transient = {child2, {supervisor_1, start_child, [LargeList]},
+ transient, 1000, worker, []},
+ Temporary = {child3, {supervisor_1, start_child, [LargeList]},
+ temporary, 1000, worker, []},
+
+ start_children(Sup1, Permanent, 100),
+ start_children(Sup2, Transient, 100),
+ start_children(Sup3, Temporary, 100),
+
+ [{memory,Mem1}] = process_info(Sup1, [memory]),
+ [{memory,Mem2}] = process_info(Sup2, [memory]),
+ [{memory,Mem3}] = process_info(Sup3, [memory]),
+
+ true = (Mem3 < Mem1) and (Mem3 < Mem2),
+
+ exit(Sup1, shutdown),
+ exit(Sup2, shutdown),
+ exit(Sup3, shutdown).
+
+start_children(_,_, 0) ->
+ ok;
+start_children(Sup, Args, N) ->
+ Spec = child_spec(Args, N),
+ {ok, _, _} = supervisor:start_child(Sup, Spec),
+ start_children(Sup, Args, N-1).
+
+child_spec([_|_] = SimpleOneForOneArgs, _) ->
+ SimpleOneForOneArgs;
+child_spec({Name, MFA, RestartType, Shutdown, Type, Modules}, N) ->
+ NewName = list_to_atom((atom_to_list(Name) ++ integer_to_list(N))),
+ {NewName, MFA, RestartType, Shutdown, Type, Modules}.