Re: how to get timestamp

Hi Raj,

You could use the timeval struct with gettimeofday to compute the time duration - as follows:

// ***************************************************************************
  struct timeval curTime;
  
  if (gettimeofday(&curTime,NULL) == -1) {
    fprintf(stderr, "gettimeofday failed. Unable to compute the start time\n");
    exit(-1);
  }

  struct timeval startTime = curTime;

  // ...
  // ... do your processing ...
  // ...

  if (gettimeofday(&curTime,NULL) == -1) {
    fprintf(stderr, "gettimeofday failed. Unable to compute the end time\n");
    exit(-1);
  }

  // Compute diffTime in microseconds
  double diffTime = ((curTime.tv_sec*1000000 + curTime.tv_usec) -
                     (startTime.tv_sec*1000000+startTime.tv_usec));
  
  // Convert back to milliseconds
  diffTime /= 1000;
// ***************************************************************************

Hope that helps.

Thanks,
Sirisha.

  ----- Original Message ----- 
  From: rajk116 
  To: [email protected] 
  Sent: Saturday, November 15, 2003 9:16 AM
  Subject: [cppug] how to get timestamp


  hi, 
  i need to calculate the time duration in msec of certain process in 
  c++.format is like

  # find starttime (get timestamp)
  # do someprocess ......
  # find finishtime (get timestamp)
  #calculate finishtime-starttime

  please reply if anyone know how to get timestamp in milliseconds..

  thanks in advance. 

  raj




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