1 /* 2 * Copyright Andrey Semashev 2007 - 2015. 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 /*! 8 * \file timestamp.hpp 9 * \author Andrey Semashev 10 * \date 31.07.2011 11 * 12 * \brief This header is the Boost.Log library implementation, see the library documentation 13 * at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html. 14 */ 15 16 #ifndef BOOST_LOG_DETAIL_TIMESTAMP_HPP_INCLUDED_ 17 #define BOOST_LOG_DETAIL_TIMESTAMP_HPP_INCLUDED_ 18 19 #include <boost/cstdint.hpp> 20 #include <boost/log/detail/config.hpp> 21 #include <boost/log/detail/header.hpp> 22 23 #ifdef BOOST_HAS_PRAGMA_ONCE 24 #pragma once 25 #endif 26 27 namespace boost { 28 29 BOOST_LOG_OPEN_NAMESPACE 30 31 namespace aux { 32 33 /*! 34 * Duration between two timestamps 35 */ 36 class duration 37 { 38 int64_t m_ticks; 39 40 public: duration(int64_t ticks=0)41 explicit duration(int64_t ticks = 0) : m_ticks(ticks) {} 42 43 #if defined(BOOST_WINDOWS) && !defined(__CYGWIN__) milliseconds() const44 int64_t milliseconds() const { return m_ticks; } 45 #else 46 BOOST_LOG_API int64_t milliseconds() const; 47 #endif 48 }; 49 50 /*! 51 * Opaque timestamp class 52 */ 53 class timestamp 54 { 55 uint64_t m_ticks; 56 57 public: timestamp(uint64_t ticks=0)58 explicit timestamp(uint64_t ticks = 0) : m_ticks(ticks) {} 59 operator -(timestamp that) const60 duration operator- (timestamp that) const 61 { 62 return duration(m_ticks - that.m_ticks); 63 } 64 }; 65 66 /*! 67 * \fn get_timestamp 68 * 69 * The function returns a timestamp, in opaque units since an unspecified 70 * time point. This timer is guaranteed to be monotonic, it should not 71 * be affected by clock changes, either manual or seasonal. Also, it 72 * should be as fast as possible. 73 */ 74 #if defined(BOOST_WINDOWS) && !defined(__CYGWIN__) 75 76 typedef uint64_t (__stdcall* get_tick_count_t)(); 77 extern BOOST_LOG_API get_tick_count_t get_tick_count; 78 get_timestamp()79inline timestamp get_timestamp() 80 { 81 return timestamp(get_tick_count()); 82 } 83 84 #else 85 86 typedef timestamp (*get_timestamp_t)(); 87 extern BOOST_LOG_API get_timestamp_t get_timestamp; 88 89 #endif 90 91 } // namespace aux 92 93 BOOST_LOG_CLOSE_NAMESPACE // namespace log 94 95 } // namespace boost 96 97 #include <boost/log/detail/footer.hpp> 98 99 #endif // BOOST_LOG_DETAIL_TIMESTAMP_HPP_INCLUDED_ 100