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
|
#!/usr/bin/env escript
%% -*- erlang -*-
main(_) ->
code:add_pathz("src/couchdb"),
etap:plan(8),
case (catch test()) of
ok ->
etap:end_tests();
Other ->
etap:diag(io_lib:format("Test died abnormally: ~p", [Other])),
etap:bail(Other)
end,
ok.
loop() ->
receive
{ping, From} ->
From ! pong
end.
wait() ->
receive
_ ->
ok
after
1000 ->
throw(timeout_error)
end.
test() ->
{ok, RefCtr} = couch_ref_counter:start([]),
etap:is(
couch_ref_counter:count(RefCtr),
1,
"A ref_counter is initialized with the calling process as a referer."
),
ChildPid1 = spawn(fun() -> loop() end),
% This is largely implicit in that nothing else breaks
% as ok is just returned from gen_server:cast()
etap:is(
couch_ref_counter:drop(RefCtr, ChildPid1),
ok,
"Dropping an unknown Pid is ignored."
),
couch_ref_counter:add(RefCtr, ChildPid1),
etap:is(
couch_ref_counter:count(RefCtr),
2,
"Adding a Pid to the ref_counter increases it's count."
),
couch_ref_counter:add(RefCtr, ChildPid1),
etap:is(
couch_ref_counter:count(RefCtr),
2,
"Readding the same Pid maintains the count but increments it's refs."
),
couch_ref_counter:drop(RefCtr, ChildPid1),
etap:is(
couch_ref_counter:count(RefCtr),
2,
"Droping the doubly added Pid only removes a ref, not a referer."
),
couch_ref_counter:drop(RefCtr, ChildPid1),
etap:is(
couch_ref_counter:count(RefCtr),
1,
"Dropping the second ref drops the referer."
),
couch_ref_counter:add(RefCtr, ChildPid1),
etap:is(
couch_ref_counter:count(RefCtr),
2,
"Sanity checking that the Pid was re-added."
),
ChildPid1 ! {ping, self()},
wait(),
etap:is(
couch_ref_counter:count(RefCtr),
1,
"The referer count was decremented automatically on process exit."
),
ok.
|
