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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: libcpp-has-no-threads
// <condition_variable>
// class condition_variable;
// template <class Clock, class Duration>
// cv_status
// wait_until(unique_lock<mutex>& lock,
// const chrono::time_point<Clock, Duration>& abs_time);
#include <condition_variable>
#include <mutex>
#include <thread>
#include <chrono>
#include <cassert>
#include "test_macros.h"
struct TestClock
{
typedef std::chrono::milliseconds duration;
typedef duration::rep rep;
typedef duration::period period;
typedef std::chrono::time_point<TestClock> time_point;
static const bool is_steady = true;
static time_point now()
{
using namespace std::chrono;
return time_point(duration_cast<duration>(
steady_clock::now().time_since_epoch()
));
}
};
std::condition_variable cv;
std::mutex mut;
int test1 = 0;
int test2 = 0;
int runs = 0;
template <typename Clock>
void f()
{
std::unique_lock<std::mutex> lk(mut);
assert(test2 == 0);
test1 = 1;
cv.notify_one();
typename Clock::time_point t0 = Clock::now();
typename Clock::time_point t = t0 + std::chrono::milliseconds(250);
while (test2 == 0 && cv.wait_until(lk, t) == std::cv_status::no_timeout)
;
typename Clock::time_point t1 = Clock::now();
if (runs == 0)
{
assert(t1 - t0 < std::chrono::milliseconds(250));
assert(test2 != 0);
}
else
{
assert(t1 - t0 - std::chrono::milliseconds(250) < std::chrono::milliseconds(50));
assert(test2 == 0);
}
++runs;
}
template <typename Clock>
void run_test()
{
runs = 0;
test1 = 0;
test2 = 0;
{
std::unique_lock<std::mutex>lk(mut);
std::thread t(f<Clock>);
assert(test1 == 0);
while (test1 == 0)
cv.wait(lk);
assert(test1 != 0);
test2 = 1;
lk.unlock();
cv.notify_one();
t.join();
}
test1 = 0;
test2 = 0;
{
std::unique_lock<std::mutex>lk(mut);
std::thread t(f<Clock>);
assert(test1 == 0);
while (test1 == 0)
cv.wait(lk);
assert(test1 != 0);
lk.unlock();
t.join();
}
}
int main(int, char**)
{
run_test<TestClock>();
run_test<std::chrono::steady_clock>();
run_test<std::chrono::system_clock>();
return 0;
}
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