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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(couch_rand).
-export([
uniform/0,
uniform/1
]).
-ifdef(NORANDMODULE).
uniform() ->
maybe_set_random_seed(),
random:uniform().
uniform(N) ->
maybe_set_random_seed(),
random:uniform(N).
maybe_set_random_seed() ->
case get(random_seed) of
undefined ->
{_, Sec, USec} = os:timestamp(),
Seed = {erlang:phash2(self()), Sec, USec},
random:seed(Seed);
_ ->
ok
end.
-else.
uniform() ->
rand:uniform().
uniform(N) ->
rand:uniform(N).
-endif.
|
