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// Copyright (C) 2020-2022 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);
}
}