1//===----------------------------------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is dual licensed under the MIT and the University of Illinois Open 6// Source Licenses. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10// <thread> 11 12// template <class Clock, class Duration> 13// void sleep_until(const chrono::time_point<Clock, Duration>& abs_time); 14 15#include <thread> 16#include <cstdlib> 17#include <cassert> 18 19int main() 20{ 21 typedef std::chrono::system_clock Clock; 22 typedef Clock::time_point time_point; 23 typedef Clock::duration duration; 24 std::chrono::milliseconds ms(500); 25 time_point t0 = Clock::now(); 26 std::this_thread::sleep_until(t0 + ms); 27 time_point t1 = Clock::now(); 28 std::chrono::nanoseconds ns = (t1 - t0) - ms; 29 std::chrono::nanoseconds err = 5 * ms / 100; 30 // The time slept is within 5% of 500ms 31 assert(std::abs(ns.count()) < err.count()); 32} 33