1*e4b17023SJohn Marino // chrono -*- C++ -*- 2*e4b17023SJohn Marino 3*e4b17023SJohn Marino // Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation, Inc. 4*e4b17023SJohn Marino // 5*e4b17023SJohn Marino // This file is part of the GNU ISO C++ Library. This library is free 6*e4b17023SJohn Marino // software; you can redistribute it and/or modify it under the 7*e4b17023SJohn Marino // terms of the GNU General Public License as published by the 8*e4b17023SJohn Marino // Free Software Foundation; either version 3, or (at your option) 9*e4b17023SJohn Marino // any later version. 10*e4b17023SJohn Marino 11*e4b17023SJohn Marino // This library is distributed in the hope that it will be useful, 12*e4b17023SJohn Marino // but WITHOUT ANY WARRANTY; without even the implied warranty of 13*e4b17023SJohn Marino // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14*e4b17023SJohn Marino // GNU General Public License for more details. 15*e4b17023SJohn Marino 16*e4b17023SJohn Marino // Under Section 7 of GPL version 3, you are granted additional 17*e4b17023SJohn Marino // permissions described in the GCC Runtime Library Exception, version 18*e4b17023SJohn Marino // 3.1, as published by the Free Software Foundation. 19*e4b17023SJohn Marino 20*e4b17023SJohn Marino // You should have received a copy of the GNU General Public License and 21*e4b17023SJohn Marino // a copy of the GCC Runtime Library Exception along with this program; 22*e4b17023SJohn Marino // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23*e4b17023SJohn Marino // <http://www.gnu.org/licenses/>. 24*e4b17023SJohn Marino 25*e4b17023SJohn Marino #include <chrono> 26*e4b17023SJohn Marino 27*e4b17023SJohn Marino #ifdef _GLIBCXX_USE_C99_STDINT_TR1 28*e4b17023SJohn Marino 29*e4b17023SJohn Marino // conditional inclusion of sys/time.h for gettimeofday 30*e4b17023SJohn Marino #if !defined(_GLIBCXX_USE_CLOCK_MONOTONIC) && \ 31*e4b17023SJohn Marino !defined(_GLIBCXX_USE_CLOCK_REALTIME) && \ 32*e4b17023SJohn Marino defined(_GLIBCXX_USE_GETTIMEOFDAY) 33*e4b17023SJohn Marino #include <sys/time.h> 34*e4b17023SJohn Marino #endif 35*e4b17023SJohn Marino 36*e4b17023SJohn Marino namespace std _GLIBCXX_VISIBILITY(default) 37*e4b17023SJohn Marino { 38*e4b17023SJohn Marino namespace chrono 39*e4b17023SJohn Marino { 40*e4b17023SJohn Marino _GLIBCXX_BEGIN_NAMESPACE_VERSION 41*e4b17023SJohn Marino 42*e4b17023SJohn Marino constexpr bool system_clock::is_steady; 43*e4b17023SJohn Marino 44*e4b17023SJohn Marino system_clock::time_point now()45*e4b17023SJohn Marino system_clock::now() noexcept 46*e4b17023SJohn Marino { 47*e4b17023SJohn Marino #ifdef _GLIBCXX_USE_CLOCK_REALTIME 48*e4b17023SJohn Marino timespec tp; 49*e4b17023SJohn Marino // -EINVAL, -EFAULT 50*e4b17023SJohn Marino clock_gettime(CLOCK_REALTIME, &tp); 51*e4b17023SJohn Marino return time_point(duration(chrono::seconds(tp.tv_sec) 52*e4b17023SJohn Marino + chrono::nanoseconds(tp.tv_nsec))); 53*e4b17023SJohn Marino #elif defined(_GLIBCXX_USE_GETTIMEOFDAY) 54*e4b17023SJohn Marino timeval tv; 55*e4b17023SJohn Marino // EINVAL, EFAULT 56*e4b17023SJohn Marino gettimeofday(&tv, 0); 57*e4b17023SJohn Marino return time_point(duration(chrono::seconds(tv.tv_sec) 58*e4b17023SJohn Marino + chrono::microseconds(tv.tv_usec))); 59*e4b17023SJohn Marino #else 60*e4b17023SJohn Marino std::time_t __sec = std::time(0); 61*e4b17023SJohn Marino return system_clock::from_time_t(__sec); 62*e4b17023SJohn Marino #endif 63*e4b17023SJohn Marino } 64*e4b17023SJohn Marino 65*e4b17023SJohn Marino #ifdef _GLIBCXX_USE_CLOCK_MONOTONIC 66*e4b17023SJohn Marino constexpr bool steady_clock::is_steady; 67*e4b17023SJohn Marino 68*e4b17023SJohn Marino steady_clock::time_point now()69*e4b17023SJohn Marino steady_clock::now() noexcept 70*e4b17023SJohn Marino { 71*e4b17023SJohn Marino timespec tp; 72*e4b17023SJohn Marino // -EINVAL, -EFAULT 73*e4b17023SJohn Marino clock_gettime(CLOCK_MONOTONIC, &tp); 74*e4b17023SJohn Marino return time_point(duration(chrono::seconds(tp.tv_sec) 75*e4b17023SJohn Marino + chrono::nanoseconds(tp.tv_nsec))); 76*e4b17023SJohn Marino } 77*e4b17023SJohn Marino #endif 78*e4b17023SJohn Marino 79*e4b17023SJohn Marino _GLIBCXX_END_NAMESPACE_VERSION 80*e4b17023SJohn Marino } // namespace chrono 81*e4b17023SJohn Marino } // namespace std 82*e4b17023SJohn Marino 83*e4b17023SJohn Marino #endif // _GLIBCXX_USE_C99_STDINT_TR1 84