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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: libcpp-has-no-threads
// <condition_variable>
// class condition_variable;
// template <class Clock, class Duration, class Predicate>
// bool
// wait_until(unique_lock<mutex>& lock,
// const chrono::time_point<Clock, Duration>& abs_time,
// Predicate pred);
#include <condition_variable>
#include <mutex>
#include <thread>
#include <chrono>
#include <cassert>
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 cv;
std::mutex mut;
int test1 = 0;
int test2 = 0;
int runs = 0;
void f()
{
std::unique_lock<std::mutex> lk(mut);
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()
{
{
std::unique_lock<std::mutex>lk(mut);
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;
{
std::unique_lock<std::mutex>lk(mut);
std::thread t(f);
assert(test1 == 0);
while (test1 == 0)
cv.wait(lk);
assert(test1 != 0);
lk.unlock();
t.join();
}
}
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