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 "rawtime_private.h"
  11 #include "timedelta.h"
  12 #include "timestamp.h"
  13 #include "units.h"
  14 #include "utils.h"
  15
  16 using namespace std;
  17
  18 namespace Msp {
  19 namespace Time {
  20
  21 TimeStamp now()
  22 {
  23 #ifndef WIN32
  24         timeval tv;
  25         gettimeofday(&tv, 0);
  26         return TimeStamp(tv.tv_sec*1000000LL+tv.tv_usec);
  27 #else
  28         static RawTime epoch = 0;
  29         if(!epoch)
  30         {
  31                 SYSTEMTIME st;
  32                 st.wYear = 1970;
  33                 st.wMonth = 1;
  34                 st.wDay = 1;
  35                 st.wHour = 0;
  36                 st.wMinute = 0;
  37                 st.wSecond = 0;
  38                 st.wMilliseconds = 0;
  39
  40                 FILETIME ft;
  41                 SystemTimeToFileTime(&st, &ft);
  42                 epoch = (ft.dwLowDateTime+(static_cast<RawTime>(ft.dwHighDateTime)<<32))/10;
  43         }
  44
  45         FILETIME ft;
  46         GetSystemTimeAsFileTime(&ft);
  47         return TimeStamp((ft.dwLowDateTime+(static_cast<RawTime>(ft.dwHighDateTime)<<32))/10-epoch);
  48 #endif
  49 }
  50
  51 string format_now(const string &fmt)
  52 {
  53         return DateTime(now()).format(fmt);
  54 }
  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 void sleep(const TimeDelta &d)
  69 {
  70 #ifndef WIN32
  71         timespec ts = rawtime_to_timespec(d.raw());
  72         while(nanosleep(&ts, 0)==-1)
  73                 if(errno!=EINTR)
  74                         throw system_error("nanosleep");
  75 #else
  76         Sleep((DWORD)(d/msec));
  77 #endif
  78 }
  79
  80 } // namespace Time
  81 } // namespace Msp