ceph/src/boost/libs/atomic/test/test_clock.hpp

   1 //  Copyright (c) 2020 Andrey Semashev
   2 //
   3 //  Distributed under the Boost Software License, Version 1.0.
   4 //  See accompanying file LICENSE_1_0.txt or copy at
   5 //  http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #ifndef BOOST_ATOMIC_TEST_TEST_CLOCK_HPP_INCLUDED_
   8 #define BOOST_ATOMIC_TEST_TEST_CLOCK_HPP_INCLUDED_
   9
  10 #include <boost/config.hpp>
  11 #if defined(BOOST_WINDOWS)
  12 #include <boost/winapi/config.hpp>
  13 #include <boost/winapi/basic_types.hpp>
  14 #include <boost/winapi/time.hpp>
  15 #include <boost/ratio/ratio.hpp>
  16 #endif
  17 #include <boost/chrono/chrono.hpp>
  18
  19 namespace chrono = boost::chrono;
  20
  21 #if defined(BOOST_WINDOWS)
  22
  23 // On Windows high precision clocks tend to cause spurious test failures because threads wake up earlier than expected.
  24 // Use a lower precision steady clock for tests.
  25 struct test_clock
  26 {
  27 #if BOOST_USE_WINAPI_VERSION >= BOOST_WINAPI_VERSION_WIN6
  28     typedef boost::winapi::ULONGLONG_ rep;
  29 #else
  30     typedef boost::winapi::DWORD_ rep;
  31 #endif
  32     typedef boost::milli period;
  33     typedef chrono::duration< rep, period > duration;
  34     typedef chrono::time_point< test_clock, duration > time_point;
  35
  36     static BOOST_CONSTEXPR_OR_CONST bool is_steady = true;
  37
  38     static time_point now() BOOST_NOEXCEPT
  39     {
  40 #if BOOST_USE_WINAPI_VERSION >= BOOST_WINAPI_VERSION_WIN6
  41         rep ticks = boost::winapi::GetTickCount64();
  42 #else
  43         rep ticks = boost::winapi::GetTickCount();
  44 #endif
  45         return time_point(duration(ticks));
  46     }
  47 };
  48
  49 #elif defined(BOOST_CHRONO_HAS_CLOCK_STEADY)
  50 typedef chrono::steady_clock test_clock;
  51 #else
  52 typedef chrono::system_clock test_clock;
  53 #endif
  54
  55 #endif // BOOST_ATOMIC_TEST_TEST_CLOCK_HPP_INCLUDED_