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83ffe9cd | 1 | // Copyright (C) 2020-2023 Free Software Foundation, Inc. |
a2d196e7 JW |
2 | // |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
6 | // Free Software Foundation; either version 3, or (at your option) | |
7 | // any later version. | |
8 | ||
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | ||
14 | // You should have received a copy of the GNU General Public License along | |
15 | // with this library; see the file COPYING3. If not see | |
16 | // <http://www.gnu.org/licenses/>. | |
17 | ||
18 | // { dg-do run } | |
19 | // { dg-options "-pthread" } | |
20 | // { dg-require-effective-target c++11 } | |
21 | // { dg-require-effective-target pthread } | |
22 | // { dg-require-gthreads "" } | |
23 | ||
24 | #include <random> | |
25 | #include <memory> | |
26 | #include <thread> | |
27 | #include <cstdio> | |
5f070ba2 | 28 | #include <testsuite_random.h> |
a2d196e7 | 29 | |
5f070ba2 | 30 | using __gnu_test::random_device_available; |
a2d196e7 JW |
31 | |
32 | void read_random_device(const char* token, int iterations) | |
33 | { | |
34 | std::random_device dev(token); | |
35 | for (int i = 0; i != iterations; ++i) | |
36 | (void) dev(); | |
37 | } | |
38 | ||
39 | int main() { | |
40 | std::thread workers[8]; | |
41 | ||
42 | // N.B. don't test /dev/random as it might block, and /dev/urandom | |
43 | // "can incur an appreciable delay when requesting large amounts of data". | |
44 | for (const char* dev : { "default", "rdrand", "rdseed", "rand_s" }) | |
45 | { | |
46 | if (random_device_available(dev)) | |
47 | { | |
48 | for (auto& w : workers) | |
49 | w = std::thread{read_random_device, dev, 1000}; | |
50 | for (auto& w : workers) | |
51 | w.join(); | |
52 | } | |
5f070ba2 JW |
53 | else |
54 | std::printf("random_device(\"%s\") not available\n", dev); | |
a2d196e7 JW |
55 | } |
56 | } |