a90c6dd460
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224658 91177308-0d34-0410-b5e6-96231b3b80d8
55 lines
1.6 KiB
C++
55 lines
1.6 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 Rep, class Period>
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// void sleep_for(const chrono::duration<Rep, Period>& rel_time);
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#include <thread>
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#include <cstdlib>
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#include <cassert>
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#include <signal.h>
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#include <sys/time.h>
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int main()
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{
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int ec;
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struct sigaction action;
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action.sa_handler = [](int) {};
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sigemptyset(&action.sa_mask);
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action.sa_flags = 0;
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ec = sigaction(SIGALRM, &action, nullptr);
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assert(!ec);
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struct itimerval it;
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it.it_interval = { 0 };
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it.it_value.tv_sec = 0;
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it.it_value.tv_usec = 250000;
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// This will result in a SIGALRM getting fired resulting in the nanosleep
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// inside sleep_for getting EINTR.
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ec = setitimer(ITIMER_REAL, &it, nullptr);
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assert(!ec);
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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_for(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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