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%%
%% %CopyrightBegin%
%%
%% SPDX-License-Identifier: Apache-2.0
%%
%% Copyright Ericsson AB 2021-2025. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
-module(kernel_test_sys_monitor).
-export([start/0, stop/0,
ping/0, ping/1,
init/1]).
-define(NAME, ?MODULE).
-define(GSM, kernel_test_global_sys_monitor).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
start() ->
Parent = self(),
proc_lib:start(?MODULE, init, [Parent]).
stop() ->
case whereis(?NAME) of
Pid when is_pid(Pid) ->
Pid ! {?MODULE, self(), stop},
receive
{?MODULE, Pid, stop} ->
ok
end;
_ ->
ok
end.
ping(Node) when is_atom(Node) andalso (Node =/= node()) ->
case rpc:call(Node, ?MODULE, ping, []) of
{badrpc, nodedown} ->
pang;
Reply ->
Reply
end.
ping() ->
case whereis(?NAME) of
Pid when is_pid(Pid) ->
Pid ! {?MODULE, self(), ping},
receive
{?MODULE, Pid, Reply} ->
Reply
end;
_ ->
pang
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
init(Parent) ->
process_flag(priority, high),
try register(?NAME, self()) of
true ->
await_synced(),
?GSM:log({?GSM:timestamp(), starting}),
MonSettings = [
busy_port,
busy_dist_port,
{long_gc, 1000},
{long_schedule, 1000},
{large_heap, 8*1024*1024} % 8 MB
],
erlang:system_monitor(self(), MonSettings),
proc_lib:init_ack(Parent, {ok, self()}),
?GSM:log({?GSM:timestamp(), started}),
loop(#{parent => Parent})
catch
_:_:_ ->
?GSM:log({?GSM:timestamp(), already_started}),
proc_lib:init_ack(Parent, {error, already_started}),
exit(normal)
end.
await_synced() ->
case global:whereis_name(?GSM) of
Pid when is_pid(Pid) ->
ok;
undefined ->
global:sync(),
receive after 1000 -> ok end,
await_synced()
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
loop(State) ->
receive
{monitor, Pid, Tag, Info} ->
?GSM:log({Pid, ?GSM:timestamp(), Tag, Info}),
loop(State);
{?MODULE, From, stop} ->
?GSM:log({?GSM:timestamp(), stopping}),
From ! {?MODULE, self(), stop},
exit(normal);
{?MODULE, From, ping} ->
?GSM:log({?GSM:timestamp(), ping}),
From ! {?MODULE, self(), pong},
loop(State);
_ ->
loop(State)
end.
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