import quincy beta 17.1.0

[ceph.git] / ceph / src / boost / libs / atomic / test / test_clock.hpp

diff --git a/ceph/src/boost/libs/atomic/test/test_clock.hpp b/ceph/src/boost/libs/atomic/test/test_clock.hpp
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+//  Copyright (c) 2020 Andrey Semashev
+//
+//  Distributed under the Boost Software License, Version 1.0.
+//  See accompanying file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_ATOMIC_TEST_TEST_CLOCK_HPP_INCLUDED_
+#define BOOST_ATOMIC_TEST_TEST_CLOCK_HPP_INCLUDED_
+
+#include <boost/config.hpp>
+#if defined(BOOST_WINDOWS)
+#include <boost/winapi/config.hpp>
+#include <boost/winapi/basic_types.hpp>
+#include <boost/winapi/time.hpp>
+#include <boost/ratio/ratio.hpp>
+#endif
+#include <boost/chrono/chrono.hpp>
+
+namespace chrono = boost::chrono;
+
+#if defined(BOOST_WINDOWS)
+
+// On Windows high precision clocks tend to cause spurious test failures because threads wake up earlier than expected.
+// Use a lower precision steady clock for tests.
+struct test_clock
+{
+#if BOOST_USE_WINAPI_VERSION >= BOOST_WINAPI_VERSION_WIN6
+    typedef boost::winapi::ULONGLONG_ rep;
+#else
+    typedef boost::winapi::DWORD_ rep;
+#endif
+    typedef boost::milli period;
+    typedef chrono::duration< rep, period > duration;
+    typedef chrono::time_point< test_clock, duration > time_point;
+
+    static BOOST_CONSTEXPR_OR_CONST bool is_steady = true;
+
+    static time_point now() BOOST_NOEXCEPT
+    {
+#if BOOST_USE_WINAPI_VERSION >= BOOST_WINAPI_VERSION_WIN6
+        rep ticks = boost::winapi::GetTickCount64();
+#else
+        rep ticks = boost::winapi::GetTickCount();
+#endif
+        return time_point(duration(ticks));
+    }
+};
+
+#elif defined(BOOST_CHRONO_HAS_CLOCK_STEADY)
+typedef chrono::steady_clock test_clock;
+#else
+typedef chrono::system_clock test_clock;
+#endif
+
+#endif // BOOST_ATOMIC_TEST_TEST_CLOCK_HPP_INCLUDED_