| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // UNSUPPORTED: libcpp-has-no-threads |
| // FLAKY_TEST. |
| |
| // <thread> |
| |
| // template <class Clock, class Duration> |
| // void sleep_until(const chrono::time_point<Clock, Duration>& abs_time); |
| |
| #include <thread> |
| #include <cstdlib> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| int main(int, char**) |
| { |
| typedef std::chrono::system_clock Clock; |
| typedef Clock::time_point time_point; |
| std::chrono::milliseconds ms(500); |
| time_point t0 = Clock::now(); |
| std::this_thread::sleep_until(t0 + ms); |
| time_point t1 = Clock::now(); |
| std::chrono::nanoseconds ns = (t1 - t0) - ms; |
| std::chrono::nanoseconds err = 5 * ms / 100; |
| // The time slept is within 5% of 500ms |
| assert(std::abs(ns.count()) < err.count()); |
| |
| return 0; |
| } |