source/time/utils.cpp

   1 /* $Id$
   2
   3 This file is part of libmspcore
   4 Copyright © 2006-2008  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #ifdef WIN32
   9 #include <windows.h>
  10 #else
  11 #include <sys/resource.h>
  12 #include <sys/time.h>
  13 #endif
  14 #include "datetime.h"
  15 #include "timedelta.h"
  16 #include "timestamp.h"
  17 #include "units.h"
  18 #include "utils.h"
  19
  20 using namespace std;
  21
  22 namespace Msp {
  23 namespace Time {
  24
  25 /**
  26 Returns the current timestamp.
  27 */
  28 TimeStamp now()
  29 {
  30 #ifndef WIN32
  31         timeval tv;
  32         gettimeofday(&tv, 0);
  33         return TimeStamp(tv.tv_sec*1000000LL+tv.tv_usec);
  34 #else
  35         static RawTime epoch=0;
  36         if(!epoch)
  37         {
  38                 SYSTEMTIME st;
  39                 st.wYear=1970;
  40                 st.wMonth=1;
  41                 st.wDay=1;
  42                 st.wHour=0;
  43                 st.wMinute=0;
  44                 st.wSecond=0;
  45                 st.wMilliseconds=0;
  46
  47                 FILETIME ft;
  48                 SystemTimeToFileTime(&st, &ft);
  49                 epoch=(ft.dwLowDateTime+(static_cast<RawTime>(ft.dwHighDateTime)<<32))/10;
  50         }
  51
  52         FILETIME ft;
  53         GetSystemTimeAsFileTime(&ft);
  54         return TimeStamp((ft.dwLowDateTime+(static_cast<RawTime>(ft.dwHighDateTime)<<32))/10-epoch);
  55 #endif
  56 }
  57
  58 string format_now(const string &fmt)
  59 {
  60         return DateTime(now()).format(fmt);
  61 }
  62
  63 /**
  64 Returns the CPU time used by the program so far.
  65 */
  66 TimeDelta get_cpu_time()
  67 {
  68 #ifndef WIN32
  69         rusage ru;
  70         getrusage(RUSAGE_SELF, &ru);
  71         return (ru.ru_utime.tv_sec+ru.ru_stime.tv_sec)*sec + (ru.ru_utime.tv_usec+ru.ru_stime.tv_usec)*usec;
  72 #else
  73         //XXX Figure out the function to use on Win32
  74         return TimeDelta();
  75 #endif
  76 }
  77
  78 /**
  79 Sleeps for the given time.
  80 */
  81 int sleep(const TimeDelta &d)
  82 {
  83 #ifndef WIN32
  84         timespec ts;
  85         d.fill_timespec(ts);
  86         return nanosleep(&ts, 0);
  87 #else
  88         Sleep((DWORD)(d/msec));
  89         return 0;
  90 #endif
  91 }
  92
  93 } // namespace Time
  94 } // namespace Msp