Purpose

DosTmrQueryTime queries the 64 bit high resolution timer.

Syntax

#define INCL_DOSPROFILE
#include  os2.h>

APIRET APIENTRY DosTmrQueryTime

(PQWORD time)

Parameters

time(PQWORD) output

Returns

ulrc (APIRET) returns

Return Code.

DosTmrQueryTime returns one of the following values

• NO_ERROR

  87

  ERROR_INVALID_PARAMETER
  99
  ERROR_DEVICE_IN_USE
  535
  ERROR_TMR_NO_DEVICE
  536
  ERROR_TMR_INVALID_TIME

  Example Code

  void int3(void);
  int main(int argc, char *argv[], char *envp[])
  {
     QWORD start_time;
     QWORD end_time;
     QWORD interval;
  
     ULONG freq;
     APIRET rc;
  
     rc=DosTmrQueryTime( start_time);
     printf("DosTmrQueryTime rc=%u time=0x%08x%08x\n",rc,start_time.ulHi,start_time.ulLo);
  
     DosSleep(100);
     printf("Sleeping 100ms\n");
  
     rc=DosTmrQueryTime( end_time);
     printf("DosTmrQueryTime rc=%u time=0x%08x%08x\n",rc,end_time.ulHi,end_time.ulLo);
  
     rc=DosTmrQueryFreq( freq);
     printf("DosTmrQueryFreq rc=%u freq=%uHz\n",rc,freq);
  
     interval.ulLo = end_time.ulLo - start_time.ulLo;
     interval.ulHi = (end_time.ulLo >= start_time.ulLo) ?
                         end_time.ulHi - start_time.ulHi 
                         end_time.ulHi - start_time.ulHi - 1;
     printf("Time interval=0x%08x%08x units=%uns\n",interval.ulHi,interval.ulLo,1000000000/freq);
     if (interval.ulHi == 0) printf("Appox. %uns\n",interval.ulLo*(1000000000/freq));
  
     return 0;
  }
  

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