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: libcpp-has-no-threads 10 11 // TODO(ldionne): This test fails on Ubuntu Focal on our CI nodes (and only there), in 32 bit mode. 12 // UNSUPPORTED: linux && 32bits-on-64bits 13 14 // <thread> 15 16 // template <class Clock, class Duration> 17 // void sleep_until(const chrono::time_point<Clock, Duration>& abs_time); 18 19 #include <thread> 20 #include <cstdlib> 21 #include <cassert> 22 23 #include "test_macros.h" 24 25 int main(int, char**) 26 { 27 typedef std::chrono::system_clock Clock; 28 typedef Clock::time_point time_point; 29 std::chrono::milliseconds ms(500); 30 time_point t0 = Clock::now(); 31 std::this_thread::sleep_until(t0 + ms); 32 time_point t1 = Clock::now(); 33 // NOTE: Operating systems are (by default) best effort and therefore we may 34 // have slept longer, perhaps much longer than we requested. 35 assert(t1 - t0 >= ms); 36 37 return 0; 38 } 39