source/time/utils.cpp

   1 #ifdef WIN32
   2 #include <windows.h>
   3 #else
   4 #include <sys/resource.h>
   5 #include <sys/time.h>
   6 #include <cerrno>
   7 #endif
   8 #include <msp/core/systemerror.h>
   9 #include "datetime.h"
  10 #include "timedelta.h"
  11 #include "timestamp.h"
  12 #include "units.h"
  13 #include "utils.h"
  14
  15 using namespace std;
  16
  17 namespace Msp {
  18 namespace Time {
  19
  20 TimeStamp now()
  21 {
  22 #ifndef WIN32
  23         timeval tv;
  24         gettimeofday(&tv, 0);
  25         return TimeStamp(tv.tv_sec*1000000LL+tv.tv_usec);
  26 #else
  27         static RawTime epoch = 0;
  28         if(!epoch)
  29         {
  30                 SYSTEMTIME st;
  31                 st.wYear = 1970;
  32                 st.wMonth = 1;
  33                 st.wDay = 1;
  34                 st.wHour = 0;
  35                 st.wMinute = 0;
  36                 st.wSecond = 0;
  37                 st.wMilliseconds = 0;
  38
  39                 FILETIME ft;
  40                 SystemTimeToFileTime(&st, &ft);
  41                 epoch = (ft.dwLowDateTime+(static_cast<RawTime>(ft.dwHighDateTime)<<32))/10;
  42         }
  43
  44         FILETIME ft;
  45         GetSystemTimeAsFileTime(&ft);
  46         return TimeStamp((ft.dwLowDateTime+(static_cast<RawTime>(ft.dwHighDateTime)<<32))/10-epoch);
  47 #endif
  48 }
  49
  50 string format_now(const string &fmt)
  51 {
  52         return DateTime(now()).format(fmt);
  53 }
  54
  55 TimeDelta get_cpu_time()
  56 {
  57 #ifndef WIN32
  58         rusage ru;
  59         getrusage(RUSAGE_SELF, &ru);
  60         return (ru.ru_utime.tv_sec+ru.ru_stime.tv_sec)*sec + (ru.ru_utime.tv_usec+ru.ru_stime.tv_usec)*usec;
  61 #else
  62         //XXX Figure out the function to use on Win32
  63         return TimeDelta();
  64 #endif
  65 }
  66
  67 void sleep(const TimeDelta &d)
  68 {
  69 #ifndef WIN32
  70         timespec ts = d;
  71         while(nanosleep(&ts, 0)==-1)
  72                 if(errno!=EINTR)
  73                         throw system_error("nanosleep");
  74 #else
  75         Sleep((DWORD)(d/msec));
  76 #endif
  77 }
  78
  79 } // namespace Time
  80 } // namespace Msp