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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
// FLAKY_TEST.
// <condition_variable>
// class condition_variable_any;
// template <class Lock, class Duration, class Predicate>
// bool
// wait_until(Lock& lock,
// const chrono::time_point<Clock, Duration>& abs_time,
// Predicate pred);
#include <condition_variable>
#include <mutex>
#include <thread>
#include <chrono>
#include <cassert>
#include "test_macros.h"
struct Clock
{
typedef std::chrono::milliseconds duration;
typedef duration::rep rep;
typedef duration::period period;
typedef std::chrono::time_point<Clock> 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()
));
}
};
class Pred
{
int& i_;
public:
explicit Pred(int& i) : i_(i) {}
bool operator()() {return i_ != 0;}
};
std::condition_variable_any cv;
typedef std::timed_mutex L0;
typedef std::unique_lock<L0> L1;
L0 m0;
int test1 = 0;
int test2 = 0;
int runs = 0;
void f()
{
L1 lk(m0);
assert(test2 == 0);
test1 = 1;
cv.notify_one();
Clock::time_point t0 = Clock::now();
Clock::time_point t = t0 + Clock::duration(250);
bool r = cv.wait_until(lk, t, Pred(test2));
Clock::time_point t1 = Clock::now();
if (runs == 0)
{
assert(t1 - t0 < Clock::duration(250));
assert(test2 != 0);
assert(r);
}
else
{
assert(t1 - t0 - Clock::duration(250) < Clock::duration(50));
assert(test2 == 0);
assert(!r);
}
++runs;
}
int main(int, char**)
{
{
L1 lk(m0);
std::thread t(f);
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;
{
L1 lk(m0);
std::thread t(f);
assert(test1 == 0);
while (test1 == 0)
cv.wait(lk);
assert(test1 != 0);
lk.unlock();
t.join();
}
return 0;
}
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