1 #ifndef BOOST_THREAD_TIME_HPP
2 #define BOOST_THREAD_TIME_HPP
3 //  (C) Copyright 2007 Anthony Williams
4 //
5 //  Distributed under the Boost Software License, Version 1.0. (See
6 //  accompanying file LICENSE_1_0.txt or copy at
7 //  http://www.boost.org/LICENSE_1_0.txt)
8 
9 #include <boost/date_time/time_clock.hpp>
10 #include <boost/date_time/microsec_time_clock.hpp>
11 #include <boost/date_time/posix_time/posix_time_types.hpp>
12 
13 #include <boost/config/abi_prefix.hpp>
14 
15 namespace boost
16 {
17     typedef boost::posix_time::ptime system_time;
18 
get_system_time()19     inline system_time get_system_time()
20     {
21 #if defined(BOOST_DATE_TIME_HAS_HIGH_PRECISION_CLOCK)
22         return boost::date_time::microsec_clock<system_time>::universal_time();
23 #else // defined(BOOST_DATE_TIME_HAS_HIGH_PRECISION_CLOCK)
24         return boost::date_time::second_clock<system_time>::universal_time();
25 #endif // defined(BOOST_DATE_TIME_HAS_HIGH_PRECISION_CLOCK)
26     }
27 
28     namespace detail
29     {
get_system_time_sentinel()30         inline system_time get_system_time_sentinel()
31         {
32             return system_time(boost::posix_time::pos_infin);
33         }
34 
get_milliseconds_until(system_time const & target_time)35         inline unsigned long get_milliseconds_until(system_time const& target_time)
36         {
37             if(target_time.is_pos_infinity())
38             {
39                 return ~(unsigned long)0;
40             }
41             system_time const now=get_system_time();
42             if(target_time<=now)
43             {
44                 return 0;
45             }
46             return static_cast<unsigned long>((target_time-now).total_milliseconds()+1);
47         }
48 
49     }
50 
51 }
52 
53 #include <boost/config/abi_suffix.hpp>
54 
55 #endif
56