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-rw-r--r--lib/tools/doc/src/lcnt.xml2
-rw-r--r--lib/tools/src/lcnt.erl9
-rw-r--r--lib/tools/test/lcnt_SUITE.erl15
3 files changed, 19 insertions, 7 deletions
diff --git a/lib/tools/doc/src/lcnt.xml b/lib/tools/doc/src/lcnt.xml
index 5bdfc60448..0c24375b91 100644
--- a/lib/tools/doc/src/lcnt.xml
+++ b/lib/tools/doc/src/lcnt.xml
@@ -371,7 +371,7 @@
<v>Serial = integer()</v>
</type>
<desc>
- <p>Creates a process id with creation 0. Example:</p>
+ <p>Creates a process id with creation 0.</p>
</desc>
</func>
diff --git a/lib/tools/src/lcnt.erl b/lib/tools/src/lcnt.erl
index 139b3d8a4a..d0152a4915 100644
--- a/lib/tools/src/lcnt.erl
+++ b/lib/tools/src/lcnt.erl
@@ -218,9 +218,11 @@ raw() -> call(raw).
set(Option, Value) -> call({set, Option, Value}).
set({Option, Value}) -> call({set, Option, Value}).
save(Filename) -> call({save, Filename}).
-load(Filename) -> ok = start_internal(), call({load, Filename}).
+load(Filename) -> call({load, Filename}).
-call(Msg) -> gen_server:call(?MODULE, Msg, infinity).
+call(Msg) ->
+ ok = start_internal(),
+ gen_server:call(?MODULE, Msg, infinity).
%% -------------------------------------------------------------------- %%
%%
@@ -237,7 +239,6 @@ apply(Fun) when is_function(Fun) ->
lcnt:apply(Fun, []).
apply(Fun, As) when is_function(Fun) ->
- ok = start_internal(),
Opt = lcnt:rt_opt({copy_save, true}),
lcnt:clear(),
Res = erlang:apply(Fun, As),
@@ -943,7 +944,7 @@ print_state_information(#state{locks = Locks} = State) ->
print(kv("#tries", s(Stats#stats.tries))),
print(kv("#colls", s(Stats#stats.colls))),
print(kv("wait time", s(Stats#stats.time) ++ " us" ++ " ( " ++ s(Stats#stats.time/1000000) ++ " s)")),
- print(kv("percent of duration", s(Stats#stats.time/State#state.duration*100) ++ " %")),
+ print(kv("percent of duration", s(percent(Stats#stats.time, State#state.duration)) ++ " %")),
ok.
diff --git a/lib/tools/test/lcnt_SUITE.erl b/lib/tools/test/lcnt_SUITE.erl
index 146c915087..a79572a742 100644
--- a/lib/tools/test/lcnt_SUITE.erl
+++ b/lib/tools/test/lcnt_SUITE.erl
@@ -30,6 +30,8 @@
t_conflicts/1,
t_locations/1,
t_swap_keys/1,
+ t_implicit_start/1,
+ t_crash_before_collect/1,
smoke_lcnt/1]).
init_per_testcase(_Case, Config) ->
@@ -44,8 +46,8 @@ suite() ->
{timetrap,{minutes,4}}].
all() ->
- [t_load, t_conflicts, t_locations, t_swap_keys,
- smoke_lcnt].
+ [t_load, t_conflicts, t_locations, t_swap_keys, t_implicit_start,
+ t_crash_before_collect, smoke_lcnt].
%%----------------------------------------------------------------------
%% Tests
@@ -149,6 +151,15 @@ t_swap_keys_file([File|Files]) ->
ok = lcnt:stop(),
t_swap_keys_file(Files).
+%% Prior to OTP-14913 this would crash with 'noproc' as the lcnt server hadn't
+%% been started yet.
+t_implicit_start(Config) when is_list(Config) ->
+ ok = lcnt:conflicts().
+
+t_crash_before_collect(Config) when is_list(Config) ->
+ {ok, _} = lcnt:start(),
+ ok = lcnt:information().
+
%% Simple smoke test of actual lock-counting, if running on
%% a run-time with lock-counting enabled.
smoke_lcnt(Config) ->