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% 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.
-module(test_engine_ref_counting).
-compile(export_all).
-include_lib("eunit/include/eunit.hrl").
-include_lib("couch/include/couch_db.hrl").
-define(NUM_CLIENTS, 1000).
cet_empty_monitors() ->
{ok, Engine, St} = test_engine_util:init_engine(),
Pids = Engine:monitored_by(St),
?assert(is_list(Pids)),
?assertEqual([], Pids -- [self(), whereis(couch_stats_process_tracker)]).
cet_incref_decref() ->
{ok, Engine, St} = test_engine_util:init_engine(),
{Pid, _} = Client = start_client(Engine, St),
wait_client(Client),
Pids1 = Engine:monitored_by(St),
?assert(lists:member(Pid, Pids1)),
close_client(Client),
Pids2 = Engine:monitored_by(St),
?assert(not lists:member(Pid, Pids2)).
cet_incref_decref_many() ->
{ok, Engine, St} = test_engine_util:init_engine(),
Clients = lists:map(fun(_) ->
start_client(Engine, St)
end, lists:seq(1, ?NUM_CLIENTS)),
lists:foreach(fun(C) -> wait_client(C) end, Clients),
Pids1 = Engine:monitored_by(St),
% +2 for db pid and process tracker
?assertEqual(?NUM_CLIENTS + 2, length(Pids1)),
lists:foreach(fun(C) -> close_client(C) end, Clients),
Pids2 = Engine:monitored_by(St),
?assertEqual(2, length(Pids2)).
start_client(Engine, St1) ->
spawn_monitor(fun() ->
{ok, St2} = Engine:incref(St1),
receive
{waiting, Pid} ->
Pid ! go
after 1000 ->
erlang:error(timeout)
end,
receive
close ->
ok
after 1000 ->
erlang:error(timeout)
end,
Engine:decref(St2)
end).
wait_client({Pid, _Ref}) ->
Pid ! {waiting, self()},
receive
go -> ok
after 1000 ->
erlang:error(timeout)
end.
close_client({Pid, Ref}) ->
Pid ! close,
receive
{'DOWN', Ref, _, _, _} ->
ok
after 1000 ->
erlang:error(timeout)
end.
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