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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.
// <thread>
// template <class Clock, class Duration>
// void sleep_until(const chrono::time_point<Clock, Duration>& abs_time);
#include <thread>
#include <cstdlib>
#include <cassert>
int main()
{
typedef std::chrono::system_clock Clock;
typedef Clock::time_point time_point;
std::chrono::milliseconds ms(500);
time_point t0 = Clock::now();
std::this_thread::sleep_until(t0 + ms);
time_point t1 = Clock::now();
std::chrono::nanoseconds ns = (t1 - t0) - ms;
std::chrono::nanoseconds err = 5 * ms / 100;
// The time slept is within 5% of 500ms
assert(std::abs(ns.count()) < err.count());
}
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