//===----------------------------------------------------------------------===//
//
// 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: no-threads
// ALLOW_RETRIES: 3
// <thread>
// template <class Rep, class Period>
// void sleep_for(const chrono::duration<Rep, Period>& rel_time);
#include <thread>
#include <cassert>
#include <chrono>
int main(int, char**)
{
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_for(ms);
time_point t1 = Clock::now();
// NOTE: Operating systems are (by default) best effort and therefore we may
// have slept longer, perhaps much longer than we requested.
assert(t1 - t0 >= ms);
return 0;
}