source/time/utils.cpp

   1 /*
   2 This file is part of libmspcore
   3 Copyright © 2006  Mikko Rasa, Mikkosoft Productions
   4 Distributed under the LGPL
   5 */
   6 #ifdef WIN32
   7 #include <windows.h>
   8 #else
   9 #include <sys/resource.h>
  10 #include <sys/time.h>
  11 #endif
  12 #include "timedelta.h"
  13 #include "timestamp.h"
  14 #include "units.h"
  15 #include "utils.h"
  16
  17 namespace Msp {
  18 namespace Time {
  19
  20 /**
  21 Returns the current timestamp.
  22 */
  23 TimeStamp now()
  24 {
  25 #ifndef WIN32
  26         timeval tv;
  27         gettimeofday(&tv, 0);
  28         return TimeStamp(tv.tv_sec*1000000LL+tv.tv_usec);
  29 #else
  30         static int64_t epoch=0;
  31         if(!epoch)
  32         {
  33                 SYSTEMTIME st;
  34                 st.wYear=1970;
  35                 st.wMonth=1;
  36                 st.wDay=1;
  37                 st.wHour=0;
  38                 st.wMinute=0;
  39                 st.wSecond=0;
  40                 st.wMilliseconds=0;
  41
  42                 FILETIME ft;
  43                 SystemTimeToFileTime(&st, &ft);
  44                 epoch=(ft.dwLowDateTime+(int64_t)ft.dwHighDateTime<<32)/10;
  45         }
  46
  47         FILETIME ft;
  48         GetSystemTimeAsFileTime(&ft);
  49         return TimeStamp((ft.dwLowDateTime+(int64_t)ft.dwHighDateTime<<32)/10-epoch);
  50 #endif
  51 }
  52
  53 /**
  54 Returns the CPU time used by the program so far.
  55 */
  56 TimeDelta get_cpu_time()
  57 {
  58 #ifndef WIN32
  59         rusage ru;
  60         getrusage(RUSAGE_SELF, &ru);
  61         return (ru.ru_utime.tv_sec+ru.ru_stime.tv_sec)*sec + (ru.ru_utime.tv_usec+ru.ru_stime.tv_usec)*usec;
  62 #else
  63         //XXX Figure out the function to use on Win32
  64         return TimeDelta();
  65 #endif
  66 }
  67
  68 /**
  69 Sleeps for the given time.
  70 */
  71 int sleep(const TimeDelta &d)
  72 {
  73 #ifndef WIN32
  74         timespec ts;
  75         d.fill_timespec(ts);
  76         return nanosleep(&ts, 0);
  77 #else
  78         Sleep((DWORD)(d/msec));
  79         return 0;
  80 #endif
  81 }
  82
  83 } // namespace Time
  84 } // namespace Msp