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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-options "-std=gnu++2a" }
// { dg-do run { target c++2a } }
// { dg-require-gthreads "" }
// { dg-additional-options "-pthread" { target pthread } }
// { dg-add-options libatomic }
#include <semaphore>
#include <chrono>
#include <thread>
#include <atomic>
#include <testsuite_hooks.h>
void test01()
{
using namespace std::chrono_literals;
std::counting_semaphore<10> s(2);
s.acquire();
auto const dur = 250ms;
{
auto const at = std::chrono::system_clock::now() + dur;
auto const t0 = std::chrono::steady_clock::now();
VERIFY( s.try_acquire_until(at) );
auto const diff = std::chrono::steady_clock::now() - t0;
VERIFY( diff < dur );
}
{
auto const at = std::chrono::system_clock::now() + dur;
auto const t0 = std::chrono::steady_clock::now();
VERIFY( !s.try_acquire_until(at) );
auto const diff = std::chrono::steady_clock::now() - t0;
VERIFY( diff >= dur );
}
}
void test02()
{
using namespace std::chrono_literals;
std::binary_semaphore s(1);
std::atomic<int> a(0), b(0);
std::thread t([&] {
a.wait(0);
auto const dur = 250ms;
{
auto const at = std::chrono::system_clock::now() + dur;
VERIFY( !s.try_acquire_until(at) );
b++;
b.notify_one();
}
a.wait(1);
{
auto const at = std::chrono::system_clock::now() + dur;
VERIFY( s.try_acquire_until(at) );
}
b++;
b.notify_one();
});
t.detach();
s.acquire();
a++;
a.notify_one();
b.wait(0);
s.release();
a++;
a.notify_one();
b.wait(1);
}
int main()
{
test01();
test02();
}
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