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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_any;
// template <class Lock, class Rep, class Period, class Predicate>
// bool
// wait_for(Lock& lock, const chrono::duration<Rep, Period>& rel_time,
// Predicate pred);
#include <condition_variable>
#include <mutex>
#include <thread>
#include <chrono>
#include <cassert>
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;
bool expect_result = false;
void f()
{
typedef std::chrono::system_clock Clock;
typedef std::chrono::milliseconds milliseconds;
L1 lk(m0);
assert(test2 == 0);
test1 = 1;
cv.notify_one();
Clock::time_point t0 = Clock::now();
bool result = cv.wait_for(lk, milliseconds(250), Pred(test2));
assert(result == expect_result);
Clock::time_point t1 = Clock::now();
if (runs == 0)
{
assert(t1 - t0 < milliseconds(250));
assert(test2 != 0);
}
else
{
assert(t1 - t0 - milliseconds(250) < milliseconds(50));
assert(test2 == 0);
}
++runs;
}
int main()
{
{
expect_result = true;
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;
{
expect_result = false;
L1 lk(m0);
std::thread t(f);
assert(test1 == 0);
while (test1 == 0)
cv.wait(lk);
assert(test1 != 0);
lk.unlock();
t.join();
}
}
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