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 nowtest_clock38 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_ 56