1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // UNSUPPORTED: libcpp-has-no-threads 11 12 // This test uses the POSIX header <sys/time.h> which Windows doesn't provide 13 // UNSUPPORTED: windows 14 15 // This test depends on signal behaviour until r210210, so some system libs 16 // don't pass. 17 // 18 // XFAIL: with_system_cxx_lib=macosx10.11 19 // XFAIL: with_system_cxx_lib=macosx10.10 20 // XFAIL: with_system_cxx_lib=macosx10.9 21 // XFAIL: with_system_cxx_lib=macosx10.8 22 // XFAIL: with_system_cxx_lib=macosx10.7 23 24 // <thread> 25 26 // template <class Rep, class Period> 27 // void sleep_for(const chrono::duration<Rep, Period>& rel_time); 28 29 #include <thread> 30 #include <cstdlib> 31 #include <cassert> 32 #include <cstring> 33 #include <signal.h> 34 #include <sys/time.h> 35 36 void sig_action(int) {} 37 38 int main() 39 { 40 int ec; 41 struct sigaction action; 42 action.sa_handler = &sig_action; 43 sigemptyset(&action.sa_mask); 44 action.sa_flags = 0; 45 46 ec = sigaction(SIGALRM, &action, nullptr); 47 assert(!ec); 48 49 struct itimerval it; 50 std::memset(&it, 0, sizeof(itimerval)); 51 it.it_value.tv_sec = 0; 52 it.it_value.tv_usec = 250000; 53 // This will result in a SIGALRM getting fired resulting in the nanosleep 54 // inside sleep_for getting EINTR. 55 ec = setitimer(ITIMER_REAL, &it, nullptr); 56 assert(!ec); 57 58 typedef std::chrono::system_clock Clock; 59 typedef Clock::time_point time_point; 60 typedef Clock::duration duration; 61 std::chrono::milliseconds ms(500); 62 time_point t0 = Clock::now(); 63 std::this_thread::sleep_for(ms); 64 time_point t1 = Clock::now(); 65 std::chrono::nanoseconds ns = (t1 - t0) - ms; 66 std::chrono::nanoseconds err = 5 * ms / 100; 67 // The time slept is within 5% of 500ms 68 assert(std::abs(ns.count()) < err.count()); 69 } 70
