2 * Copyright 2013 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #include "folly/Random.h"
19 #include <glog/logging.h>
20 #include <gtest/gtest.h>
26 using namespace folly;
28 TEST(Random, Simple) {
29 uint32_t prev = 0, seed = 0;
30 for (int i = 0; i < 1024; ++i) {
31 EXPECT_NE(seed = randomNumberSeed(), prev);
36 TEST(Random, MultiThreaded) {
38 std::vector<uint32_t> seeds(n);
39 std::vector<std::thread> threads;
40 for (int i = 0; i < n; ++i) {
41 threads.push_back(std::thread([i, &seeds] {
42 seeds[i] = randomNumberSeed();
45 for (auto& t : threads) {
48 std::sort(seeds.begin(), seeds.end());
49 for (int i = 0; i < n-1; ++i) {
50 EXPECT_LT(seeds[i], seeds[i+1]);