| % 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. |