Chris@16: /*
Chris@101:  *          Copyright Andrey Semashev 2007 - 2015.
Chris@16:  * Distributed under the Boost Software License, Version 1.0.
Chris@16:  *    (See accompanying file LICENSE_1_0.txt or copy at
Chris@16:  *          http://www.boost.org/LICENSE_1_0.txt)
Chris@16:  */
Chris@16: /*!
Chris@16:  * \file   timestamp.hpp
Chris@16:  * \author Andrey Semashev
Chris@16:  * \date   31.07.2011
Chris@16:  *
Chris@16:  * \brief  This header is the Boost.Log library implementation, see the library documentation
Chris@16:  *         at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
Chris@16:  */
Chris@16: 
Chris@16: #ifndef BOOST_LOG_DETAIL_TIMESTAMP_HPP_INCLUDED_
Chris@16: #define BOOST_LOG_DETAIL_TIMESTAMP_HPP_INCLUDED_
Chris@16: 
Chris@16: #include <boost/cstdint.hpp>
Chris@16: #include <boost/log/detail/config.hpp>
Chris@16: #include <boost/log/detail/header.hpp>
Chris@16: 
Chris@16: #ifdef BOOST_HAS_PRAGMA_ONCE
Chris@16: #pragma once
Chris@16: #endif
Chris@16: 
Chris@16: namespace boost {
Chris@16: 
Chris@16: BOOST_LOG_OPEN_NAMESPACE
Chris@16: 
Chris@16: namespace aux {
Chris@16: 
Chris@16: /*!
Chris@16:  * Duration between two timestamps
Chris@16:  */
Chris@16: class duration
Chris@16: {
Chris@16:     int64_t m_ticks;
Chris@16: 
Chris@16: public:
Chris@16:     explicit duration(int64_t ticks = 0) : m_ticks(ticks) {}
Chris@16: 
Chris@16: #if defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
Chris@16:     int64_t milliseconds() const { return m_ticks; }
Chris@16: #else
Chris@16:     BOOST_LOG_API int64_t milliseconds() const;
Chris@16: #endif
Chris@16: };
Chris@16: 
Chris@16: /*!
Chris@16:  * Opaque timestamp class
Chris@16:  */
Chris@16: class timestamp
Chris@16: {
Chris@16:     uint64_t m_ticks;
Chris@16: 
Chris@16: public:
Chris@16:     explicit timestamp(uint64_t ticks = 0) : m_ticks(ticks) {}
Chris@16: 
Chris@16:     duration operator- (timestamp that) const
Chris@16:     {
Chris@16:         return duration(m_ticks - that.m_ticks);
Chris@16:     }
Chris@16: };
Chris@16: 
Chris@16: /*!
Chris@16:  * \fn get_timestamp
Chris@16:  *
Chris@16:  * The function returns a timestamp, in opaque units since an unspecified
Chris@16:  * time point. This timer is guaranteed to be monotonic, it should not
Chris@16:  * be affected by clock changes, either manual or seasonal. Also, it
Chris@16:  * should be as fast as possible.
Chris@16:  */
Chris@16: #if defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
Chris@16: 
Chris@16: typedef uint64_t (__stdcall* get_tick_count_t)();
Chris@16: extern BOOST_LOG_API get_tick_count_t get_tick_count;
Chris@16: 
Chris@16: inline timestamp get_timestamp()
Chris@16: {
Chris@16:     return timestamp(get_tick_count());
Chris@16: }
Chris@16: 
Chris@16: #else
Chris@16: 
Chris@16: typedef timestamp (*get_timestamp_t)();
Chris@16: extern BOOST_LOG_API get_timestamp_t get_timestamp;
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16: } // namespace aux
Chris@16: 
Chris@16: BOOST_LOG_CLOSE_NAMESPACE // namespace log
Chris@16: 
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #include <boost/log/detail/footer.hpp>
Chris@16: 
Chris@16: #endif // BOOST_LOG_DETAIL_TIMESTAMP_HPP_INCLUDED_