35 lines
1.0 KiB
C++
35 lines
1.0 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// UNSUPPORTED: libcpp-has-no-threads
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// <thread>
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// template <class Clock, class Duration>
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// void sleep_until(const chrono::time_point<Clock, Duration>& abs_time);
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#include <thread>
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#include <cstdlib>
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#include <cassert>
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int main()
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{
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typedef std::chrono::system_clock Clock;
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typedef Clock::time_point time_point;
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typedef Clock::duration duration;
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std::chrono::milliseconds ms(500);
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time_point t0 = Clock::now();
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std::this_thread::sleep_until(t0 + ms);
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time_point t1 = Clock::now();
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std::chrono::nanoseconds ns = (t1 - t0) - ms;
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std::chrono::nanoseconds err = 5 * ms / 100;
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// The time slept is within 5% of 500ms
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assert(std::abs(ns.count()) < err.count());
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}
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