1*38fd1498Szrj // Compatibility symbols for previous versions, C++0x bits -*- C++ -*- 2*38fd1498Szrj 3*38fd1498Szrj // Copyright (C) 2013-2018 Free Software Foundation, Inc. 4*38fd1498Szrj // 5*38fd1498Szrj // This file is part of the GNU ISO C++ Library. This library is free 6*38fd1498Szrj // software; you can redistribute it and/or modify it under the 7*38fd1498Szrj // terms of the GNU General Public License as published by the 8*38fd1498Szrj // Free Software Foundation; either version 3, or (at your option) 9*38fd1498Szrj // any later version. 10*38fd1498Szrj 11*38fd1498Szrj // This library is distributed in the hope that it will be useful, 12*38fd1498Szrj // but WITHOUT ANY WARRANTY; without even the implied warranty of 13*38fd1498Szrj // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14*38fd1498Szrj // GNU General Public License for more details. 15*38fd1498Szrj 16*38fd1498Szrj // Under Section 7 of GPL version 3, you are granted additional 17*38fd1498Szrj // permissions described in the GCC Runtime Library Exception, version 18*38fd1498Szrj // 3.1, as published by the Free Software Foundation. 19*38fd1498Szrj 20*38fd1498Szrj // You should have received a copy of the GNU General Public License and 21*38fd1498Szrj // a copy of the GCC Runtime Library Exception along with this program; 22*38fd1498Szrj // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23*38fd1498Szrj // <http://www.gnu.org/licenses/>. 24*38fd1498Szrj 25*38fd1498Szrj #include <bits/c++config.h> 26*38fd1498Szrj 27*38fd1498Szrj #ifdef _GLIBCXX_USE_C99_STDINT_TR1 28*38fd1498Szrj 29*38fd1498Szrj #ifdef _GLIBCXX_USE_GETTIMEOFDAY 30*38fd1498Szrj #include <sys/time.h> 31*38fd1498Szrj #endif 32*38fd1498Szrj 33*38fd1498Szrj #define system_clock system_clockXX 34*38fd1498Szrj #define steady_clock steady_clockXX 35*38fd1498Szrj #include <chrono> 36*38fd1498Szrj #undef system_clock 37*38fd1498Szrj #undef steady_clock 38*38fd1498Szrj 39*38fd1498Szrj namespace std _GLIBCXX_VISIBILITY(default) 40*38fd1498Szrj { 41*38fd1498Szrj _GLIBCXX_BEGIN_NAMESPACE_VERSION 42*38fd1498Szrj 43*38fd1498Szrj namespace chrono 44*38fd1498Szrj { 45*38fd1498Szrj // NB: Default configuration was no realtime. 46*38fd1498Szrj struct system_clock 47*38fd1498Szrj { 48*38fd1498Szrj #ifdef _GLIBCXX_USE_GETTIMEOFDAY 49*38fd1498Szrj typedef chrono::microseconds duration; 50*38fd1498Szrj #else 51*38fd1498Szrj typedef chrono::seconds duration; 52*38fd1498Szrj #endif 53*38fd1498Szrj 54*38fd1498Szrj typedef duration::rep rep; 55*38fd1498Szrj typedef duration::period period; 56*38fd1498Szrj typedef chrono::time_point<system_clock, duration> time_point; 57*38fd1498Szrj 58*38fd1498Szrj static_assert(system_clock::duration::min() 59*38fd1498Szrj < system_clock::duration::zero(), 60*38fd1498Szrj "a clock's minimum duration cannot be less than its epoch"); 61*38fd1498Szrj 62*38fd1498Szrj static constexpr bool is_steady = false; 63*38fd1498Szrj 64*38fd1498Szrj static time_point 65*38fd1498Szrj now() noexcept; 66*38fd1498Szrj }; 67*38fd1498Szrj 68*38fd1498Szrj constexpr bool system_clock::is_steady; 69*38fd1498Szrj 70*38fd1498Szrj system_clock::time_point now()71*38fd1498Szrj system_clock::now() noexcept 72*38fd1498Szrj { 73*38fd1498Szrj #ifdef _GLIBCXX_USE_GETTIMEOFDAY 74*38fd1498Szrj timeval tv; 75*38fd1498Szrj // EINVAL, EFAULT 76*38fd1498Szrj gettimeofday(&tv, 0); 77*38fd1498Szrj return time_point(duration(chrono::seconds(tv.tv_sec) 78*38fd1498Szrj + chrono::microseconds(tv.tv_usec))); 79*38fd1498Szrj #else 80*38fd1498Szrj std::time_t __sec = std::time(0); 81*38fd1498Szrj // This is the conversion done by system_clock::from_time_t(__sec) 82*38fd1498Szrj typedef chrono::time_point<system_clock, seconds> __from; 83*38fd1498Szrj return time_point_cast<system_clock::duration> 84*38fd1498Szrj (__from(chrono::seconds(__sec))); 85*38fd1498Szrj #endif 86*38fd1498Szrj } 87*38fd1498Szrj } // namespace chrono 88*38fd1498Szrj 89*38fd1498Szrj _GLIBCXX_END_NAMESPACE_VERSION 90*38fd1498Szrj } // namespace std 91*38fd1498Szrj 92*38fd1498Szrj #endif // _GLIBCXX_USE_C99_STDINT_TR1 93