1bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant//===----------------------------------------------------------------------===// 2bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// 3f5256e16dfc425c1d466f6308d4026d529ce9e0bHoward Hinnant// The LLVM Compiler Infrastructure 4bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// 5b64f8b07c104c6cc986570ac8ee0ed16a9f23976Howard Hinnant// This file is dual licensed under the MIT and the University of Illinois Open 6b64f8b07c104c6cc986570ac8ee0ed16a9f23976Howard Hinnant// Source Licenses. See LICENSE.TXT for details. 7bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// 8bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant//===----------------------------------------------------------------------===// 97112dae6acac544a0271a85d95342c583441e2d1Dan Albert// 107112dae6acac544a0271a85d95342c583441e2d1Dan Albert// UNSUPPORTED: libcpp-has-no-threads 11bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 12bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// <thread> 13bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 14bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// template <class Clock, class Duration> 15bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// void sleep_until(const chrono::time_point<Clock, Duration>& abs_time); 16bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 17bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant#include <thread> 18bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant#include <cstdlib> 19bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant#include <cassert> 20bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 21bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnantint main() 22bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant{ 23bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant typedef std::chrono::system_clock Clock; 24bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant typedef Clock::time_point time_point; 25bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant typedef Clock::duration duration; 26bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant std::chrono::milliseconds ms(500); 27bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant time_point t0 = Clock::now(); 28bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant std::this_thread::sleep_until(t0 + ms); 29bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant time_point t1 = Clock::now(); 30bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant std::chrono::nanoseconds ns = (t1 - t0) - ms; 316b875ef3746dec865c7071fc3caab8cd2fcceb3bDaniel Dunbar std::chrono::nanoseconds err = 5 * ms / 100; 326b875ef3746dec865c7071fc3caab8cd2fcceb3bDaniel Dunbar // The time slept is within 5% of 500ms 33bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(std::abs(ns.count()) < err.count()); 34bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant} 35