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authorHenrik Nord <[email protected]>2011-08-30 10:42:08 +0200
committerHenrik Nord <[email protected]>2011-08-30 10:42:16 +0200
commit6f81b23c61610373f96681a4ca85ca9701873ec6 (patch)
tree27e3071e01ebdf56f2d55bd85f929c446990c139 /lib
parent036f82b9d3e664ec326f1a303d4f990848d94b96 (diff)
parent4f9b938112a80f1c1e210b1a6af40a42f833cfa2 (diff)
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Merge branch 'ft/fix_supervisor_temporary_restart' into dev
OTP-9502
Diffstat (limited to 'lib')
-rw-r--r--lib/stdlib/doc/src/supervisor.xml9
-rw-r--r--lib/stdlib/src/supervisor.erl7
-rw-r--r--lib/stdlib/test/supervisor_SUITE.erl35
3 files changed, 46 insertions, 5 deletions
diff --git a/lib/stdlib/doc/src/supervisor.xml b/lib/stdlib/doc/src/supervisor.xml
index 009aa60faa..edd119d37a 100644
--- a/lib/stdlib/doc/src/supervisor.xml
+++ b/lib/stdlib/doc/src/supervisor.xml
@@ -150,9 +150,12 @@ child_spec() = {Id,StartFunc,Restart,Shutdown,Type,Modules}
<p><c>Restart</c> defines when a terminated child process
should be restarted. A <c>permanent</c> child process should
always be restarted, a <c>temporary</c> child process should
- never be restarted and a <c>transient</c> child process
- should be restarted only if it terminates abnormally, i.e.
- with another exit reason than <c>normal</c>.</p>
+ never be restarted (even when the supervisor's restart strategy
+ is <c>rest_for_one</c> or <c>one_for_all</c> and a sibling's
+ death causes the temporary process to be terminated) and a
+ <c>transient</c> child process should be restarted only if
+ it terminates abnormally, i.e. with another exit reason
+ than <c>normal</c>.</p>
</item>
<item>
<p><c>Shutdown</c> defines how a child process should be
diff --git a/lib/stdlib/src/supervisor.erl b/lib/stdlib/src/supervisor.erl
index e60706ed05..dc31647eb5 100644
--- a/lib/stdlib/src/supervisor.erl
+++ b/lib/stdlib/src/supervisor.erl
@@ -735,6 +735,13 @@ restart(one_for_all, Child, State) ->
terminate_children(Children, SupName) ->
terminate_children(Children, SupName, []).
+%% Temporary children should not be restarted and thus should
+%% be skipped when building the list of terminated children, although
+%% we do want them to be shut down as many functions from this module
+%% use this function to just clear everything.
+terminate_children([Child = #child{restart_type=temporary} | Children], SupName, Res) ->
+ do_terminate(Child, SupName),
+ terminate_children(Children, SupName, Res);
terminate_children([Child | Children], SupName, Res) ->
NChild = do_terminate(Child, SupName),
terminate_children(Children, SupName, [NChild | Res]);
diff --git a/lib/stdlib/test/supervisor_SUITE.erl b/lib/stdlib/test/supervisor_SUITE.erl
index ff5e4c629a..b48450c151 100644
--- a/lib/stdlib/test/supervisor_SUITE.erl
+++ b/lib/stdlib/test/supervisor_SUITE.erl
@@ -42,7 +42,7 @@
-export([ permanent_normal/1, transient_normal/1,
temporary_normal/1,
permanent_abnormal/1, transient_abnormal/1,
- temporary_abnormal/1]).
+ temporary_abnormal/1, temporary_bystander/1]).
%% Restart strategy tests
-export([ one_for_one/1,
@@ -74,7 +74,7 @@ all() ->
{group, abnormal_termination}, child_unlink, tree,
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].
+ simple_one_for_one_scale_many_temporary_children, temporary_bystander].
groups() ->
[{sup_start, [],
@@ -607,6 +607,37 @@ temporary_abnormal(Config) when is_list(Config) ->
[0,0,0,0] = get_child_counts(sup_test).
%%-------------------------------------------------------------------------
+temporary_bystander(doc) ->
+ ["A temporary process killed as part of a rest_for_one or one_for_all "
+ "restart strategy should not be restarted given its args are not "
+ " saved. Otherwise the supervisor hits its limit and crashes."];
+temporary_bystander(suite) -> [];
+temporary_bystander(_Config) ->
+ Child1 = {child1, {supervisor_1, start_child, []}, permanent, 100,
+ worker, []},
+ Child2 = {child2, {supervisor_1, start_child, []}, temporary, 100,
+ worker, []},
+ {ok, SupPid1} = supervisor:start_link(?MODULE, {ok, {{one_for_all, 2, 300}, []}}),
+ {ok, SupPid2} = supervisor:start_link(?MODULE, {ok, {{rest_for_one, 2, 300}, []}}),
+ unlink(SupPid1), % otherwise we crash with it
+ unlink(SupPid2), % otherwise we crash with it
+ {ok, CPid1} = supervisor:start_child(SupPid1, Child1),
+ {ok, _CPid2} = supervisor:start_child(SupPid1, Child2),
+ {ok, CPid3} = supervisor:start_child(SupPid2, Child1),
+ {ok, _CPid4} = supervisor:start_child(SupPid2, Child2),
+ terminate(SupPid1, CPid1, child1, normal),
+ terminate(SupPid2, CPid3, child1, normal),
+ timer:sleep(350),
+ catch link(SupPid1),
+ catch link(SupPid2),
+ %% The supervisor would die attempting to restart child2
+ true = erlang:is_process_alive(SupPid1),
+ true = erlang:is_process_alive(SupPid2),
+ %% Child2 has not been restarted
+ [{child1, _, _, _}] = supervisor:which_children(SupPid1),
+ [{child1, _, _, _}] = supervisor:which_children(SupPid2).
+
+%%-------------------------------------------------------------------------
one_for_one(doc) ->
["Test the one_for_one base case."];
one_for_one(suite) -> [];