| // Copyright (C) 2020-2023 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // You should have received a copy of the GNU General Public License along |
| // with this library; see the file COPYING3. If not see |
| // <http://www.gnu.org/licenses/>. |
| |
| // { dg-do run } |
| // { dg-options "-pthread" } |
| // { dg-require-effective-target c++11 } |
| // { dg-require-effective-target pthread } |
| // { dg-require-gthreads "" } |
| |
| #include <random> |
| #include <memory> |
| #include <thread> |
| #include <cstdio> |
| #include <testsuite_random.h> |
| |
| using __gnu_test::random_device_available; |
| |
| void read_random_device(const char* token, int iterations) |
| { |
| std::random_device dev(token); |
| for (int i = 0; i != iterations; ++i) |
| (void) dev(); |
| } |
| |
| int main() { |
| std::thread workers[8]; |
| |
| // N.B. don't test /dev/random as it might block, and /dev/urandom |
| // "can incur an appreciable delay when requesting large amounts of data". |
| for (const char* dev : { "default", "rdrand", "rdseed", "rand_s" }) |
| { |
| if (random_device_available(dev)) |
| { |
| for (auto& w : workers) |
| w = std::thread{read_random_device, dev, 1000}; |
| for (auto& w : workers) |
| w.join(); |
| } |
| else |
| std::printf("random_device(\"%s\") not available\n", dev); |
| } |
| } |