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#!/usr/bin/env escript
%% -*- erlang -*-
% 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.
main(_) ->
test_util:init_code_path(),
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
close -> ok
end.
wait() ->
receive
{'DOWN', _, _, _, _} -> 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."
),
erlang:monitor(process, ChildPid1),
ChildPid1 ! close,
wait(),
CheckFun = fun
(Iter, nil) ->
case couch_ref_counter:count(RefCtr) of
1 -> Iter;
_ -> nil
end;
(_, Acc) ->
Acc
end,
Result = lists:foldl(CheckFun, nil, lists:seq(1, 10000)),
etap:isnt(
Result,
nil,
"The referer count was decremented automatically on process exit."
),
ok.
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