54 lines
1.2 KiB
C++
54 lines
1.2 KiB
C++
//
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// high_res_clock.hpp
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// ~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef HIGH_RES_CLOCK_HPP
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#define HIGH_RES_CLOCK_HPP
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#include <boost/config.hpp>
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#include <boost/cstdint.hpp>
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#if defined(BOOST_ASIO_WINDOWS)
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inline boost::uint64_t high_res_clock()
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{
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LARGE_INTEGER i;
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QueryPerformanceCounter(&i);
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return i.QuadPart;
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}
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#elif defined(__GNUC__) && defined(__x86_64__)
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inline boost::uint64_t high_res_clock()
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{
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unsigned long low, high;
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__asm__ __volatile__("rdtsc" : "=a" (low), "=d" (high));
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return (((boost::uint64_t)high) << 32) | low;
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}
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#else
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#include <boost/date_time/posix_time/posix_time_types.hpp>
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inline boost::uint64_t high_res_clock()
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{
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boost::posix_time::ptime now =
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boost::posix_time::microsec_clock::universal_time();
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boost::posix_time::ptime epoch(
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boost::gregorian::date(1970, 1, 1),
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boost::posix_time::seconds(0));
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return (now - epoch).total_microseconds();
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}
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#endif
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#endif // HIGH_RES_CLOCK_HPP
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