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 19 int 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 = ms / 100; 30 // The time slept is within 1% of 500ms 31 assert(std::abs(ns.count()) < err.count()); 32 } 33
