1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
% 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(cpse_test_ref_counting).
-compile(export_all).
-compile(nowarn_export_all).
-include_lib("eunit/include/eunit.hrl").
-include_lib("couch/include/couch_db.hrl").
-define(NUM_CLIENTS, 1000).
setup_each() ->
{ok, Db} = cpse_util:create_db(),
{Db, self()}.
teardown_each({Db, _}) ->
ok = couch_server:delete(couch_db:name(Db), []).
cpse_empty_monitors({Db, Pid}) ->
Pids = couch_db_engine:monitored_by(Db),
?assert(is_list(Pids)),
Expected = [
Pid,
couch_db:get_pid(Db),
whereis(couch_stats_process_tracker)
],
?assertEqual([], Pids -- Expected).
cpse_incref_decref({Db, _}) ->
{Pid, _} = Client = start_client(Db),
wait_client(Client),
Pids1 = couch_db_engine:monitored_by(Db),
?assert(lists:member(Pid, Pids1)),
close_client(Client),
Pids2 = couch_db_engine:monitored_by(Db),
?assert(not lists:member(Pid, Pids2)).
cpse_incref_decref_many({Db, _}) ->
Clients = lists:map(
fun(_) ->
start_client(Db)
end,
lists:seq(1, ?NUM_CLIENTS)
),
lists:foreach(fun(C) -> wait_client(C) end, Clients),
Pids1 = couch_db_engine:monitored_by(Db),
% +3 for self, db pid, and process tracker
?assertEqual(?NUM_CLIENTS + 3, length(Pids1)),
lists:foreach(fun(C) -> close_client(C) end, Clients),
Pids2 = couch_db_engine:monitored_by(Db),
?assertEqual(3, length(Pids2)).
start_client(Db0) ->
spawn_monitor(fun() ->
{ok, Db1} = couch_db:open_int(couch_db:name(Db0), []),
receive
{waiting, Pid} ->
Pid ! go
after 1000 ->
erlang:error(timeout)
end,
receive
close ->
couch_db:close(Db1),
ok
after 1000 ->
erlang:error(timeout)
end
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.
|
