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authorDan Gudmundsson <[email protected]>2017-11-20 15:23:24 +0100
committerDan Gudmundsson <[email protected]>2017-12-01 15:24:02 +0100
commitd4341cd249d728174fce580bd018e1e8b402d161 (patch)
treeda490e0cd419bf3413f4d55992e659e23ecbb6e7 /lib/kernel/test
parenta90b3712dcec20c96eeeecbabc2672ec67c7d89a (diff)
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kernel: add a resource reference counter
System resources/functionality may need to be reference counted to be handled correctly when used or enabled/disabled from more than one process or application. It is easier to handle this in erlang code than in erts, so make a process that deals with the housekeeping.
Diffstat (limited to 'lib/kernel/test')
-rw-r--r--lib/kernel/test/kernel_SUITE.erl69
1 files changed, 67 insertions, 2 deletions
diff --git a/lib/kernel/test/kernel_SUITE.erl b/lib/kernel/test/kernel_SUITE.erl
index da56359294..7898988dbe 100644
--- a/lib/kernel/test/kernel_SUITE.erl
+++ b/lib/kernel/test/kernel_SUITE.erl
@@ -30,14 +30,14 @@
-export([init_per_testcase/2, end_per_testcase/2]).
%% Test cases must be exported.
--export([app_test/1, appup_test/1]).
+-export([app_test/1, appup_test/1, refc/1]).
suite() ->
[{ct_hooks,[ts_install_cth]},
{timetrap,{minutes,2}}].
all() ->
- [app_test, appup_test].
+ [app_test, appup_test, refc].
groups() ->
[].
@@ -163,3 +163,68 @@ check_appup([Vsn|Vsns],Instrs,Expected) ->
end;
check_appup([],_,_) ->
ok.
+
+%%% Check that refc module handles the counters as expected
+refc(_Config) ->
+ Enable = fun(Enable) -> erlang:system_flag(scheduler_wall_time, Enable) end,
+ IsOn = fun() -> undefined /= erlang:statistics(scheduler_wall_time) end,
+ Tester = self(),
+ Loop = fun Loop() ->
+ receive
+ die -> normal;
+ {apply, Bool} ->
+ Res = Enable(Bool),
+ Tester ! {self(), Res},
+ Loop()
+ end
+ end,
+
+ %% Counter should be 0
+ false = Enable(false),
+
+ false = Enable(true),
+ true = Enable(true),
+ true = Enable(false),
+ true = Enable(false),
+
+ %% Counter should be 0
+ false = IsOn(),
+
+ P1 = spawn_link(Loop),
+ P1 ! {apply, true},
+ receive {P1, R1} -> false = R1 end,
+
+ %% P1 has turned it on counter should be one
+ true = IsOn(),
+ true = Enable(true),
+ true = Enable(false),
+ true = IsOn(),
+
+ P1 ! {apply, false},
+ receive {P1, R2} -> true = R2 end,
+ false = IsOn(),
+
+ P1 ! {apply, true},
+ receive {P1, R3} -> false = R3 end,
+ true = IsOn(),
+ true = Enable(false),
+
+
+ P1 ! die,
+ timer:sleep(100),
+ false = IsOn(),
+ false = Enable(false),
+
+ P2 = spawn_link(Loop),
+ P2 ! {apply, true},
+ receive {P2, R4} -> false = R4 end,
+ true = IsOn(),
+ P2 ! {apply, true},
+ receive {P2, R5} -> true = R5 end,
+ true = IsOn(),
+
+ P2 ! die,
+ timer:sleep(100),
+ false = IsOn(),
+
+ ok.