1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // UNSUPPORTED: no-threads 10 11 // <thread> 12 13 // template <class Clock, class Duration> 14 // void sleep_until(const chrono::time_point<Clock, Duration>& abs_time); 15 16 #include <cassert> 17 #include <chrono> 18 #include <cstdlib> 19 #include <thread> 20 21 #include "test_macros.h" 22 main(int,char **)23int main(int, char**) 24 { 25 typedef std::chrono::system_clock Clock; 26 typedef Clock::time_point time_point; 27 std::chrono::milliseconds ms(500); 28 time_point t0 = Clock::now(); 29 std::this_thread::sleep_until(t0 + ms); 30 time_point t1 = Clock::now(); 31 // NOTE: Operating systems are (by default) best effort and therefore we may 32 // have slept longer, perhaps much longer than we requested. 33 assert(t1 - t0 >= ms); 34 35 return 0; 36 } 37