%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2003-2010. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
-module(hibernate_SUITE).
-include_lib("test_server/include/test_server.hrl").
-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1,
init_per_group/2,end_per_group/2,
init_per_testcase/2,end_per_testcase/2,
basic/1,min_heap_size/1,bad_args/1,
messages_in_queue/1,undefined_mfa/1, no_heap/1]).
%% Used by test cases.
-export([basic_hibernator/1,messages_in_queue_restart/2, no_heap_loop/0]).
suite() -> [{ct_hooks,[ts_install_cth]}].
all() ->
[basic, min_heap_size, bad_args, messages_in_queue,
undefined_mfa, no_heap].
groups() ->
[].
init_per_suite(Config) ->
Config.
end_per_suite(_Config) ->
ok.
init_per_group(_GroupName, Config) ->
Config.
end_per_group(_GroupName, Config) ->
Config.
init_per_testcase(Func, Config) when is_atom(Func), is_list(Config) ->
Dog = ?t:timetrap(?t:minutes(3)),
[{watchdog,Dog}|Config].
end_per_testcase(_Func, Config) ->
Dog=?config(watchdog, Config),
?t:timetrap_cancel(Dog).
%%%
%%% Testing the basic functionality of erlang:hibernate/3.
%%%
basic(Config) when is_list(Config) ->
Ref = make_ref(),
Info = {self(),Ref},
ExpectedHeapSz = case erlang:system_info(heap_type) of
private -> erts_debug:size([Info]);
hybrid -> erts_debug:size([a|b])
end,
?line Child = spawn_link(fun() -> basic_hibernator(Info) end),
?line hibernate_wake_up(100, ExpectedHeapSz, Child),
?line Child ! please_quit_now,
ok.
hibernate_wake_up(0, _, _) -> ok;
hibernate_wake_up(N, ExpectedHeapSz, Child) ->
{heap_size,Before} = process_info(Child, heap_size),
case N rem 2 of
0 ->
Child ! {acquire_old_heap,self()},
receive
done -> ok
end;
1 -> ok
end,
?line Child ! {hibernate,self()},
?line wait_until(fun () ->
{current_function,{erlang,hibernate,3}} ==
process_info(Child, current_function)
end),
?line {message_queue_len,0} = process_info(Child, message_queue_len),
?line {status,waiting} = process_info(Child, status),
?line {heap_size,ExpectedHeapSz} = process_info(Child, heap_size),
io:format("Before hibernation: ~p After hibernation: ~p\n",
[Before,ExpectedHeapSz]),
?line Child ! {whats_up,self()},
?line receive
{all_fine,X,Child,_Ref} ->
if
N =:= 1 -> io:format("~p\n", [X]);
true -> ok
end,
{backtrace,Bin} = process_info(Child, backtrace),
if
size(Bin) > 1000 ->
io:format("~s\n", [binary_to_list(Bin)]),
?line ?t:fail(stack_is_growing);
true ->
hibernate_wake_up(N-1, ExpectedHeapSz, Child)
end;
Other ->
?line io:format("~p\n", [Other]),
?line ?t:fail(unexpected_message)
end.
basic_hibernator(Info) ->
{catchlevel,0} = process_info(self(), catchlevel),
receive
Any ->
basic_hibernator_msg(Any, Info),
basic_hibernator(Info)
end.
basic_hibernator_msg({hibernate,_}, Info) ->
catch erlang:hibernate(?MODULE, basic_hibernator, [Info]),
exit(hibernate_returned);
basic_hibernator_msg({acquire_old_heap,Parent}, _) ->
acquire_old_heap(),
Parent ! done;
basic_hibernator_msg({whats_up,Parent}, {Parent,Ref}) ->
{heap_size,HeapSize} = process_info(self(), heap_size),
io:format("Heap size after waking up: ~p\n", [HeapSize]),
X = whats_up_calc(5000, 2, math:pi(), 4, 5, 6, 7, 8.5, 9, []),
Parent ! {all_fine,X,self(),Ref};
basic_hibernator_msg(please_quit_now, _) ->
exit(normal);
basic_hibernator_msg(Other, _) ->
exit({unexpected,Other}).
acquire_old_heap() ->
case process_info(self(), [heap_size,total_heap_size]) of
[{heap_size,Sz},{total_heap_size,Total}] when Sz < Total ->
ok;
_ ->
acquire_old_heap()
end.
%% The point with this calculation is to force memory to be
%% allocated for the argument registers in the process structure.
%% The allocation will be forced if the process is scheduled out
%% while calling a function with more than 6 arguments.
whats_up_calc(0, A2, A3, A4, A5, A6, A7, A8, A9, Acc) ->
{Acc,A2+A3+A4+A5+A6+A7+A8+A9};
whats_up_calc(A1, A2, A3, A4, A5, A6, A7, A8, A9, Acc) ->
whats_up_calc(A1-1, A2+1, A3+2, A4+3, A5+4, A6+5, A7+6, A8+7, A9+8, [A1,A2|Acc]).
%%%
%%% Testing setting the minimum heap size.
%%%
min_heap_size(Config) when is_list(Config) ->
?line erlang:trace(new, true, [call]),
MFA = {?MODULE,min_hibernator,1},
?line 1 = erlang:trace_pattern(MFA, true, [local]),
Ref = make_ref(),
Info = {self(),Ref},
?line Child = spawn_opt(fun() -> min_hibernator(Info) end,
[{min_heap_size,15000},link]),
receive
{trace,Child,call,{?MODULE,min_hibernator,_}} ->
?line 1 = erlang:trace_pattern(MFA, false, [local]),
?line erlang:trace(new, false, [call])
end,
{heap_size,HeapSz} = process_info(Child, heap_size),
io:format("Heap size: ~p\n", [HeapSz]),
?line if
HeapSz < 20 -> ok
end,
?line Child ! wake_up,
receive
{heap_size,AfterSize} ->
io:format("Heap size after wakeup: ~p\n", [AfterSize]),
?line
if
AfterSize >= 15000 -> ok
end;
Other ->
io:format("Unexpected: ~p\n", [Other]),
?line ?t:fail()
end.
min_hibernator({Parent,_Ref}) ->
erlang:hibernate(erlang, apply, [fun min_hibernator_recv/1, [Parent]]).
min_hibernator_recv(Parent) ->
receive
wake_up ->
Parent ! process_info(self(), heap_size)
end.
%%%
%%% Testing feeding erlang:hibernate/3 with bad arguments.
%%%
bad_args(Config) when is_list(Config) ->
?line bad_args(?MODULE, {name,glurf}, [0]),
?line {'EXIT',{system_limit,_}} =
(catch erlang:hibernate(x, y, lists:duplicate(5122, xxx))),
?line bad_args(42, name, [0]),
?line bad_args(xx, 42, [1]),
?line bad_args(xx, 42, glurf),
?line bad_args(xx, 42, {}),
?line bad_args({}, name, [2]),
?line bad_args({1}, name, [3]),
?line bad_args({1,2,3}, name, [4]),
?line bad_args({1,2,3}, name, [5]),
?line bad_args({1,2,3,4}, name, [6]),
?line bad_args({1,2,3,4,5,6}, name,[7]),
?line bad_args({1,2,3,4,5}, name, [8]),
?line bad_args({1,2}, name, [9]),
?line bad_args([1,2], name, [9]),
?line bad_args(55.0, name, [9]),
ok.
bad_args(Mod, Name, Args) ->
Res = (catch erlang:hibernate(Mod, Name, Args)),
erlang:garbage_collect(),
case Res of
{'EXIT',{badarg,_Where}} ->
io:format("erlang:hibernate(~p, ~p, ~p) -> ~p\n", [Mod,Name,Args,Res]);
Other ->
io:format("erlang:hibernate(~p, ~p, ~p) -> ~p\n", [Mod,Name,Args,Res]),
?t:fail({bad_result,Other})
end.
%%%
%%% Testing calling erlang:hibernate/3 with messages already in the message queue.
%%%
messages_in_queue(Config) when is_list(Config) ->
Self = self(),
Msg = {Self,make_ref(),a,message},
Pid = spawn_link(fun() -> messages_in_queue_1(Self, Msg) end),
Pid ! Msg,
Pid ! go_ahead,
receive
done -> ok;
Other ->
?line io:format("~p\n", [Other]),
?line ?t:fail(unexpected_message)
end.
messages_in_queue_1(Parent, ExpectedMsg) ->
receive
go_ahead -> ok
end,
{message_queue_len,1} = process_info(self(), message_queue_len),
erlang:hibernate(?MODULE, messages_in_queue_restart,
[Parent,ExpectedMsg]).
messages_in_queue_restart(Parent, ExpectedMessage) ->
?line receive
ExpectedMessage ->
Parent ! done;
Other ->
io:format("~p\n", [Other]),
?t:fail(unexpected_message)
end,
ok.
%%%
%%% Test that trying to hibernate to an undefined MFA gives the correct
%%% exit behavior.
%%%
undefined_mfa(Config) when is_list(Config) ->
?line process_flag(trap_exit, true),
?line Pid = spawn_link(fun() ->
%% Will be a call_only instruction.
erlang:hibernate(?MODULE, blarf, []) end),
?line Pid ! {a,message},
?line receive
{'EXIT',Pid,{undef,Undef}} ->
io:format("~p\n", [Undef]),
ok;
Other ->
?line io:format("~p\n", [Other]),
?line ?t:fail(unexpected_message)
end,
undefined_mfa_1().
undefined_mfa_1() ->
?line Pid = spawn_link(fun() ->
%% Force a call_last instruction by calling bar()
%% (if that is not obvious).
bar(),
erlang:hibernate(?MODULE, blarf, [])
end),
?line Pid ! {another,message},
?line receive
{'EXIT',Pid,{undef,Undef}} ->
io:format("~p\n", [Undef]),
ok;
Other ->
?line io:format("~p\n", [Other]),
?line ?t:fail(unexpected_message)
end,
ok.
bar() ->
ok.
%%
%% No heap
%%
no_heap(doc) -> [];
no_heap(suite) -> [];
no_heap(Config) when is_list(Config) ->
?line H = spawn_link(fun () -> clean_dict(), no_heap_loop() end),
?line lists:foreach(fun (_) ->
wait_until(fun () -> is_hibernated(H) end),
?line [{heap_size,1},
{total_heap_size,1}]
= process_info(H,
[heap_size,
total_heap_size]),
receive after 10 -> ok end,
H ! again
end,
lists:seq(1, 100)),
?line unlink(H),
?line exit(H, bye).
no_heap_loop() ->
flush(),
erlang:hibernate(?MODULE, no_heap_loop, []).
clean_dict() ->
{dictionary, Dict} = process_info(self(), dictionary),
lists:foreach(fun ({Key, _}) -> erase(Key) end, Dict).
%%
%% Misc
%%
is_hibernated(P) ->
case process_info(P, [current_function, status]) of
[{current_function, {erlang, hibernate, _}},
{status, waiting}] ->
true;
_ ->
false
end.
flush() ->
receive
_Msg -> flush()
after 0 ->
ok
end.
wait_until(Fun) ->
case catch Fun() of
true -> ok;
_ -> receive after 10 -> wait_until(Fun) end
end.
