//  boost thread_clock.cpp  -----------------------------------------------------------//
 
 //  Copyright Beman Dawes 1994, 2006, 2008
 //  Copyright Vicente J. Botet Escriba 2009-2011
 //  Copyright Christopher Brown 2013
 
 //  Distributed under the Boost Software License, Version 1.0.
 //  See http://www.boost.org/LICENSE_1_0.txt
 
 //  See http://www.boost.org/libs/chrono for documentation.
 
 //--------------------------------------------------------------------------------------//
 
 #include <boost/chrono/config.hpp>
 #include <boost/chrono/thread_clock.hpp>
 #include <cassert>
 #include <boost/assert.hpp>
 
 # include <pthread.h>
 # include <mach/thread_act.h>
 
 namespace boost { namespace chrono {
 
     thread_clock::time_point thread_clock::now( ) BOOST_NOEXCEPT
     {
         // get the thread port (borrowing pthread's reference)
         mach_port_t port = pthread_mach_thread_np(pthread_self());
 
         // get the thread info
         thread_basic_info_data_t info;
         mach_msg_type_number_t count = THREAD_BASIC_INFO_COUNT;
         if ( thread_info(port, THREAD_BASIC_INFO, (thread_info_t)&info, &count) != KERN_SUCCESS )
         {
             BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
             return time_point();
         }
 
         // convert to nanoseconds
         duration user = duration(
                 static_cast<thread_clock::rep>( info.user_time.seconds ) * 1000000000
                         + static_cast<thread_clock::rep>(info.user_time.microseconds ) * 1000);
 
         duration system = duration(
                 static_cast<thread_clock::rep>( info.system_time.seconds ) * 1000000000
                         + static_cast<thread_clock::rep>( info.system_time.microseconds ) * 1000);
 
         return time_point( user + system );
     }
 
 #if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
     thread_clock::time_point thread_clock::now( system::error_code & ec )
     {
         // get the thread port (borrowing pthread's reference)
         mach_port_t port = pthread_mach_thread_np(pthread_self());
 
         // get the thread info
         thread_basic_info_data_t info;
         mach_msg_type_number_t count = THREAD_BASIC_INFO_COUNT;
         if ( thread_info(port, THREAD_BASIC_INFO, (thread_info_t)&info, &count) != KERN_SUCCESS )
         {
             if (::boost::chrono::is_throws(ec))
             {
                 boost::throw_exception(
                         system::system_error(
                                 EINVAL,
                                 ::boost::system::system_category(),
                                 "chrono::thread_clock" ));
             }
             else
             {
                 ec.assign( errno, ::boost::system::system_category() );
                 return time_point();
             }
         }
         if (!::boost::chrono::is_throws(ec))
         {
             ec.clear();
         }
 
         // convert to nanoseconds
         duration user = duration(
                 static_cast<thread_clock::rep>( info.user_time.seconds ) * 1000000000
                         + static_cast<thread_clock::rep>(info.user_time.microseconds ) * 1000);
 
         duration system = duration(
                 static_cast<thread_clock::rep>( info.system_time.seconds ) * 1000000000
                         + static_cast<thread_clock::rep>( info.system_time.microseconds ) * 1000);
 
         return time_point( user + system );
     }
 #endif
 } }