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- //
- // high_res_clock.hpp
- // ~~~~~~~~~~~~~~~~~~
- //
- // Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
- //
- // 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 HIGH_RES_CLOCK_HPP
- #define HIGH_RES_CLOCK_HPP
- #include <boost/config.hpp>
- #include <boost/cstdint.hpp>
- #if defined(BOOST_ASIO_WINDOWS)
- inline boost::uint64_t high_res_clock()
- {
- LARGE_INTEGER i;
- QueryPerformanceCounter(&i);
- return i.QuadPart;
- }
- #elif defined(__GNUC__) && defined(__x86_64__)
- inline boost::uint64_t high_res_clock()
- {
- unsigned long low, high;
- __asm__ __volatile__("rdtsc" : "=a" (low), "=d" (high));
- return (((boost::uint64_t)high) << 32) | low;
- }
- #else
- #include <boost/date_time/posix_time/posix_time_types.hpp>
- inline boost::uint64_t high_res_clock()
- {
- boost::posix_time::ptime now =
- boost::posix_time::microsec_clock::universal_time();
- boost::posix_time::ptime epoch(
- boost::gregorian::date(1970, 1, 1),
- boost::posix_time::seconds(0));
- return (now - epoch).total_microseconds();
- }
- #endif
- #endif // HIGH_RES_CLOCK_HPP
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