ceph/src/boost/boost/thread/pthread/timespec.hpp

   1 #ifndef BOOST_THREAD_PTHREAD_TIMESPEC_HPP
   2 #define BOOST_THREAD_PTHREAD_TIMESPEC_HPP
   3 //  (C) Copyright 2007-8 Anthony Williams
   4 //  (C) Copyright 2012 Vicente J. Botet Escriba
   5 //
   6 //  Distributed under the Boost Software License, Version 1.0. (See
   7 //  accompanying file LICENSE_1_0.txt or copy at
   8 //  http://www.boost.org/LICENSE_1_0.txt)
   9
  10 #include <boost/thread/detail/config.hpp>
  11 #include <boost/thread/thread_time.hpp>
  12 #if defined BOOST_THREAD_USES_DATETIME
  13 #include <boost/date_time/posix_time/conversion.hpp>
  14 #endif
  15 #include <pthread.h>
  16 #ifndef _WIN32
  17 #include <unistd.h>
  18 #endif
  19 #ifdef BOOST_THREAD_USES_CHRONO
  20 #include <boost/chrono/duration.hpp>
  21 #endif
  22
  23 #if defined(macintosh) || defined(__APPLE__) || defined(__APPLE_CC__)
  24 #     define BOOST_THREAD_TIMESPEC_MAC_API
  25 #include <sys/time.h> //for gettimeofday and timeval
  26 #else
  27 #include <time.h>  // for clock_gettime
  28 #endif
  29
  30 #include <boost/config/abi_prefix.hpp>
  31
  32 namespace boost
  33 {
  34   namespace detail
  35   {
  36 #if defined BOOST_THREAD_USES_DATETIME
  37     inline struct timespec to_timespec(boost::system_time const& abs_time)
  38     {
  39       struct timespec timeout = { 0,0};
  40       boost::posix_time::time_duration const time_since_epoch=abs_time-boost::posix_time::from_time_t(0);
  41
  42       timeout.tv_sec=time_since_epoch.total_seconds();
  43       timeout.tv_nsec=(long)(time_since_epoch.fractional_seconds()*(1000000000l/time_since_epoch.ticks_per_second()));
  44       return timeout;
  45     }
  46 #endif
  47 #if defined BOOST_THREAD_USES_CHRONO
  48     inline timespec to_timespec(chrono::nanoseconds const& ns)
  49     {
  50       struct timespec ts;
  51       ts.tv_sec = static_cast<long>(chrono::duration_cast<chrono::seconds>(ns).count());
  52       ts.tv_nsec = static_cast<long>((ns - chrono::duration_cast<chrono::seconds>(ns)).count());
  53       return ts;
  54     }
  55
  56 #endif
  57
  58     inline timespec to_timespec(boost::intmax_t const& ns)
  59     {
  60       boost::intmax_t s = ns / 1000000000l;
  61       struct timespec ts;
  62       ts.tv_sec = static_cast<long> (s);
  63       ts.tv_nsec = static_cast<long> (ns - s * 1000000000l);
  64       return ts;
  65     }
  66     inline boost::intmax_t to_nanoseconds_int_max(timespec const& ts)
  67     {
  68       return static_cast<boost::intmax_t>(ts.tv_sec) * 1000000000l + ts.tv_nsec;
  69     }
  70     inline bool timespec_ge_zero(timespec const& ts)
  71     {
  72       return (ts.tv_sec >= 0) || (ts.tv_nsec >= 0);
  73     }
  74 #if defined BOOST_THREAD_HAS_CONDATTR_SET_CLOCK_MONOTONIC
  75
  76     inline timespec timespec_now_monotonic()
  77     {
  78       timespec ts;
  79
  80       if ( ::clock_gettime( CLOCK_MONOTONIC, &ts ) )
  81       {
  82         ts.tv_sec = 0;
  83         ts.tv_nsec = 0;
  84         BOOST_ASSERT(0 && "Boost::Thread - Internal Error");
  85       }
  86       return ts;
  87     }
  88 #endif
  89
  90     inline timespec timespec_now_realtime()
  91     {
  92       timespec ts;
  93
  94 #if defined(BOOST_THREAD_TIMESPEC_MAC_API)
  95       timeval tv;
  96       ::gettimeofday(&tv, 0);
  97       ts.tv_sec = tv.tv_sec;
  98       ts.tv_nsec = tv.tv_usec * 1000;
  99 #else
 100       if ( ::clock_gettime( CLOCK_REALTIME, &ts ) )
 101       {
 102         ts.tv_sec = 0;
 103         ts.tv_nsec = 0;
 104         BOOST_ASSERT(0 && "Boost::Thread - Internal Error");
 105       }
 106 #endif
 107       return ts;
 108     }
 109     inline timespec timespec_zero()
 110     {
 111       timespec ts;
 112       ts.tv_sec = 0;
 113       ts.tv_nsec = 0;
 114       return ts;
 115     }
 116     inline timespec timespec_plus(timespec const& lhs, timespec const& rhs)
 117     {
 118       return to_timespec(to_nanoseconds_int_max(lhs) + to_nanoseconds_int_max(rhs));
 119     }
 120     inline timespec timespec_minus(timespec const& lhs, timespec const& rhs)
 121     {
 122       return to_timespec(to_nanoseconds_int_max(lhs) - to_nanoseconds_int_max(rhs));
 123     }
 124     inline bool timespec_gt(timespec const& lhs, timespec const& rhs)
 125     {
 126       return to_nanoseconds_int_max(lhs) > to_nanoseconds_int_max(rhs);
 127     }
 128     inline bool timespec_ge(timespec const& lhs, timespec const& rhs)
 129     {
 130       return to_nanoseconds_int_max(lhs) >= to_nanoseconds_int_max(rhs);
 131     }
 132
 133   }
 134 }
 135
 136 #include <boost/config/abi_suffix.hpp>
 137
 138 #endif