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