nova-tt/nanosleep.hpp

   1 //  cross-platform wrapper for nanosleep
   2 //  Copyright (C) 2009 Tim Blechmann
   3 //
   4 //  This program is free software; you can redistribute it and/or modify
   5 //  it under the terms of the GNU General Public License as published by
   6 //  the Free Software Foundation; either version 2 of the License, or
   7 //  (at your option) any later version.
   8 //
   9 //  This program is distributed in the hope that it will be useful,
  10 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 //  GNU General Public License for more details.
  13 //
  14 //  You should have received a copy of the GNU General Public License
  15 //  along with this program; see the file COPYING.  If not, write to
  16 //  the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17 //  Boston, MA 02111-1307, USA.
  18
  19 /** \file nanosleep.hpp */
  20 /** \namespace nova */
  21
  22
  23 #ifndef NOVA_TT_NANOSLEEP_HPP
  24 #define NOVA_TT_NANOSLEEP_HPP
  25
  26 #include <cassert>
  27
  28 #if defined(unix) || defined(__unix__) || defined(__unix)
  29 # include <unistd.h>
  30 #endif
  31
  32 #if (_POSIX_TIMERS - 0) >= 200112L
  33 #include <time.h>
  34 #endif /* _POSIX_TIMERS */
  35
  36 #include <boost/thread.hpp>
  37 #include <boost/date_time/posix_time/posix_time_duration.hpp>
  38
  39 namespace nova
  40 {
  41
  42 namespace detail
  43 {
  44 const unsigned long ns_per_s = 1000000000;
  45
  46 inline void nanosleep(unsigned long sec, unsigned long ns)
  47 {
  48     assert(ns < ns_per_s);
  49
  50 #if _POSIX_C_SOURCE >= 199309L
  51     struct timespec timeout, remain;
  52     timeout.tv_sec = sec;
  53     timeout.tv_nsec = ns;
  54     nanosleep(&timeout, &remain);
  55 #else
  56 #ifdef BOOST_DATE_TIME_HAS_NANOSECONDS
  57     boost::this_thread::sleep(boost::posix_time::seconds(sec) + boost::posix_time::nanoseconds(ns));
  58 #else
  59     boost::this_thread::sleep(boost::posix_time::seconds(sec) + boost::posix_time::microseconds(ns*0.001));
  60 #endif
  61 #endif
  62 }
  63
  64 } /* namespace detail */
  65
  66 /** sleep for ns nanoseconds
  67  */
  68 inline void nanosleep(unsigned long ns)
  69 {
  70     if (ns < detail::ns_per_s)
  71         detail::nanosleep(0, ns);
  72     else
  73         detail::nanosleep(ns/detail::ns_per_s, ns%detail::ns_per_s);
  74 }
  75
  76 }  /* namespace nova */
  77
  78 #endif /* NOVA_TT_NANOSLEEP_HPP */