hp_timer_impl.hpp

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/******************************************************************************
** Copyright © 2012 by J.M.McGuiness, coder@hussar.me.uk
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
 
namespace jmmcg { namespace LIBJMMCG_VER_NAMESPACE {
 
template<typename Mdl>
inline typename hp_timer<ppd::generic_traits::api_type::posix_pthreads, Mdl>::value_type
hp_timer<ppd::generic_traits::api_type::posix_pthreads, Mdl>::to_usec(const time_utc_t ticks) noexcept(true) {
   const value_type tmp=static_cast<value_type>(ticks.tv_sec)*1000000+ticks.tv_nsec/1000.0;
   return tmp;
}
 
template<typename Mdl>
inline const typename hp_timer<ppd::generic_traits::api_type::posix_pthreads, Mdl>::time_utc_t
hp_timer<ppd::generic_traits::api_type::posix_pthreads, Mdl>::get_start_time() noexcept(false) {
   time_utc_t tm;
   if (::clock_gettime(CLOCK_REALTIME, &tm)) {
      throw exception_type(_T("High-performance counter not supported."), info::function(__LINE__,__PRETTY_FUNCTION__,typeid(&hp_timer<ppd::generic_traits::api_type::posix_pthreads, Mdl>::get_start_time)), JMMCG_REVISION_HDR(_T(LIBJMMCG_VERSION_NUMBER)));
   }
   return tm;
}
 
template<typename Mdl>
inline typename hp_timer<ppd::generic_traits::api_type::posix_pthreads, Mdl>::value_type
hp_timer<ppd::generic_traits::api_type::posix_pthreads, Mdl>::current_count() noexcept(false) {
   return to_usec(get_start_time());
}
 
template<typename Mdl>
inline const typename hp_timer<ppd::generic_traits::api_type::posix_pthreads, Mdl>::time_utc_t
hp_timer<ppd::generic_traits::api_type::posix_pthreads, Mdl>::current_time() const noexcept(false) {
   return get_start_time();
}
 
template<typename Mdl>
inline
hp_timer<ppd::generic_traits::api_type::posix_pthreads, Mdl>::hp_timer() noexcept(false)
: start_up_time(get_start_time()),
   start_up_count(current_count()) {
}
 
template <typename T>
inline
hp_interval<T>::~hp_interval() noexcept(true) {
   const typename timer_t::time_utc_t end=timer.current_time();
   if (end.tv_nsec>=start.tv_nsec) {
      interval.tv_nsec=end.tv_nsec-start.tv_nsec;
      interval.tv_sec=end.tv_sec-start.tv_sec;
   } else {
      interval.tv_nsec=1000000000+(end.tv_nsec-start.tv_nsec);
      interval.tv_sec=end.tv_sec-start.tv_sec-1;
   }
}
 
} }