| // |
| // high_res_clock.hpp |
| // ~~~~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2015 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 |
