diff options
Diffstat (limited to 'lib/stdlib')
| -rw-r--r-- | lib/stdlib/doc/src/supervisor.xml | 12 | ||||
| -rw-r--r-- | lib/stdlib/src/supervisor.erl | 2 | ||||
| -rw-r--r-- | lib/stdlib/test/supervisor_SUITE.erl | 23 |
3 files changed, 33 insertions, 4 deletions
diff --git a/lib/stdlib/doc/src/supervisor.xml b/lib/stdlib/doc/src/supervisor.xml index ffac1c0bd7..6ff477a42d 100644 --- a/lib/stdlib/doc/src/supervisor.xml +++ b/lib/stdlib/doc/src/supervisor.xml @@ -386,9 +386,15 @@ added to the supervisor and the function returns the same value.</p> <p>If the child process start function returns <c>ignore</c>, - the child specification is added to the supervisor, the pid - is set to <c>undefined</c>, and the function returns - <c>{ok,undefined}</c>.</p> + the child specification is added to the supervisor (unless the + supervisor is a <c>simple_one_for_one</c> supervisor, see below), + the pid is set to <c>undefined</c> and the function returns + <c>{ok,undefined}</c>. + </p> + <p>In the case of a <c>simple_one_for_one</c> supervisor, when a child + process start function returns <c>ignore</c> the functions returns + <c>{ok,undefined}</c> and no child is added to the supervisor. + </p> <p>If the child process start function returns an error tuple or an erroneous value, or if it fails, the child specification is discarded, and the function returns <c>{error,Error}</c> where diff --git a/lib/stdlib/src/supervisor.erl b/lib/stdlib/src/supervisor.erl index 67655b1145..1d7396adee 100644 --- a/lib/stdlib/src/supervisor.erl +++ b/lib/stdlib/src/supervisor.erl @@ -381,7 +381,7 @@ handle_call({start_child, EArgs}, _From, State) when ?is_simple(State) -> #child{mfargs = {M, F, A}} = Child, Args = A ++ EArgs, case do_start_child_i(M, F, Args) of - {ok, undefined} when Child#child.restart_type =:= temporary -> + {ok, undefined} -> {reply, {ok, undefined}, State}; {ok, Pid} -> NState = save_dynamic_child(Child#child.restart_type, Pid, Args, State), diff --git a/lib/stdlib/test/supervisor_SUITE.erl b/lib/stdlib/test/supervisor_SUITE.erl index 9dcf19707c..015b09f35e 100644 --- a/lib/stdlib/test/supervisor_SUITE.erl +++ b/lib/stdlib/test/supervisor_SUITE.erl @@ -37,6 +37,7 @@ sup_start_ignore_child/1, sup_start_ignore_temporary_child/1, sup_start_ignore_temporary_child_start_child/1, sup_start_ignore_temporary_child_start_child_simple/1, + sup_start_ignore_permanent_child_start_child_simple/1, sup_start_error_return/1, sup_start_fail/1, sup_start_map/1, sup_start_map_faulty_specs/1, sup_stop_infinity/1, sup_stop_timeout/1, sup_stop_brutal_kill/1, @@ -99,6 +100,7 @@ groups() -> sup_start_ignore_child, sup_start_ignore_temporary_child, sup_start_ignore_temporary_child_start_child, sup_start_ignore_temporary_child_start_child_simple, + sup_start_ignore_permanent_child_start_child_simple, sup_start_error_return, sup_start_fail]}, {sup_start_map, [], [sup_start_map, sup_start_map_faulty_specs]}, @@ -250,6 +252,27 @@ sup_start_ignore_temporary_child_start_child_simple(Config) [1,1,0,1] = get_child_counts(sup_test). %%------------------------------------------------------------------------- +%% Tests what happens if child's init-callback returns ignore for a +%% permanent child when child is started with start_child/2, and the +%% supervisor is simple_one_for_one. +%% Child spec shall NOT be saved!!! +sup_start_ignore_permanent_child_start_child_simple(Config) + when is_list(Config) -> + process_flag(trap_exit, true), + Child1 = {child1, {supervisor_1, start_child, [ignore]}, + permanent, 1000, worker, []}, + {ok, Pid} = start_link({ok, {{simple_one_for_one, 2, 3600}, [Child1]}}), + + {ok, undefined} = supervisor:start_child(sup_test, []), + {ok, CPid2} = supervisor:start_child(sup_test, []), + + [{undefined, CPid2, worker, []}] = supervisor:which_children(sup_test), + [1,1,0,1] = get_child_counts(sup_test), + + %% Regression test: check that the supervisor terminates without error. + exit(Pid, shutdown), + check_exit_reason(Pid, shutdown). +%%------------------------------------------------------------------------- %% Tests what happens if init-callback returns a invalid value. sup_start_error_return(Config) when is_list(Config) -> process_flag(trap_exit, true), |