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 "datetime.h"
  13 #include "timedelta.h"
  14 #include "timestamp.h"
  15 #include "units.h"
  16 #include "utils.h"
  17
  18 using namespace std;
  19
  20 namespace Msp {
  21 namespace Time {
  22
  23 /**
  24 Returns the current timestamp.
  25 */
  26 TimeStamp now()
  27 {
  28 #ifndef WIN32
  29         timeval tv;
  30         gettimeofday(&tv, 0);
  31         return TimeStamp(tv.tv_sec*1000000LL+tv.tv_usec);
  32 #else
  33         static int64_t epoch=0;
  34         if(!epoch)
  35         {
  36                 SYSTEMTIME st;
  37                 st.wYear=1970;
  38                 st.wMonth=1;
  39                 st.wDay=1;
  40                 st.wHour=0;
  41                 st.wMinute=0;
  42                 st.wSecond=0;
  43                 st.wMilliseconds=0;
  44
  45                 FILETIME ft;
  46                 SystemTimeToFileTime(&st, &ft);
  47                 epoch=(ft.dwLowDateTime+(int64_t)ft.dwHighDateTime<<32)/10;
  48         }
  49
  50         FILETIME ft;
  51         GetSystemTimeAsFileTime(&ft);
  52         return TimeStamp((ft.dwLowDateTime+(int64_t)ft.dwHighDateTime<<32)/10-epoch);
  53 #endif
  54 }
  55
  56 string format_now(const string &fmt)
  57 {
  58         return DateTime(now()).format(fmt);
  59 }
  60
  61 /**
  62 Returns the CPU time used by the program so far.
  63 */
  64 TimeDelta get_cpu_time()
  65 {
  66 #ifndef WIN32
  67         rusage ru;
  68         getrusage(RUSAGE_SELF, &ru);
  69         return (ru.ru_utime.tv_sec+ru.ru_stime.tv_sec)*sec + (ru.ru_utime.tv_usec+ru.ru_stime.tv_usec)*usec;
  70 #else
  71         //XXX Figure out the function to use on Win32
  72         return TimeDelta();
  73 #endif
  74 }
  75
  76 /**
  77 Sleeps for the given time.
  78 */
  79 int sleep(const TimeDelta &d)
  80 {
  81 #ifndef WIN32
  82         timespec ts;
  83         d.fill_timespec(ts);
  84         return nanosleep(&ts, 0);
  85 #else
  86         Sleep((DWORD)(d/msec));
  87         return 0;
  88 #endif
  89 }
  90
  91 } // namespace Time
  92 } // namespace Msp