chrono.h

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//
// Copyright (c) 2009, Markus Rickert
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
//   this list of conditions and the following disclaimer in the documentation
//   and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
 
#ifndef RL_UTIL_XENOMAI_CHRONO_H
#define RL_UTIL_XENOMAI_CHRONO_H
 
#include <chrono>
#include <native/timer.h>
 
namespace rl
{
    namespace util
    {
        namespace xenomai
        {
            namespace chrono
            {
                struct steady_clock
                {
                    typedef ::std::chrono::nanoseconds duration;
                    
                    typedef duration::period period;
                    
                    typedef duration::rep rep;
                    
                    typedef ::std::chrono::time_point<steady_clock, duration> time_point;
                    
                    static constexpr bool is_monotonic = true;
                    
                    static constexpr bool is_steady = true;
                    
                    static time_point now()
                    {
                        return time_point(duration(::rt_timer_tsc2ns(::rt_timer_tsc())));
                    }
                };
                
                struct system_clock
                {
                    typedef ::std::chrono::nanoseconds duration;
                    
                    typedef duration::period period;
                    
                    typedef duration::rep rep;
                    
                    typedef ::std::chrono::time_point<system_clock, duration> time_point;
                    
                    static constexpr bool is_monotonic = false;
                    
                    static constexpr bool is_steady = false;
                    
                    static time_point now()
                    {
                        return time_point(duration(::rt_timer_ticks2ns(::rt_timer_read())));
                    }
                    
                    static ::std::time_t to_time_t(const time_point& t)
                    {
                        return ::std::time_t(
                            ::std::chrono::duration_cast< ::std::chrono::seconds>(
                                t.time_since_epoch()
                            ).count()
                        );
                    }
                    
                    static time_point from_time_t(std::time_t t)
                    {
                        return ::std::chrono::time_point_cast<system_clock::duration>(
                            ::std::chrono::time_point<system_clock, ::std::chrono::seconds>(
                                ::std::chrono::seconds(t)
                            )
                        );
                    }
                };
            }
        }
    }
}
 
#endif // RL_UTIL_XENOMAI_CHRONO_H