stopwatch.cpp

   1 #include "stopwatch.h"
   2
   3 StopWatch::StopWatch() :
   4     started(false)
   5 {
   6 }
   7
   8 void StopWatch::start(void)
   9 {
  10     started = true;
  11     clock_gettime(CLOCK_MONOTONIC, &starttime);
  12 }
  13
  14 long StopWatch::elapsedmsec(void)
  15 {
  16     if(!started) return -1;
  17
  18     timespec tmp;
  19     clock_gettime(CLOCK_MONOTONIC, &tmp);
  20     tmp = timedifference(starttime,tmp);
  21     return tmp.tv_sec*1000+tmp.tv_nsec/1000000;
  22 }
  23
  24 float StopWatch::elapsedsec(void)
  25 {
  26     if(!started) return -1;
  27
  28     timespec tmp;
  29     clock_gettime(CLOCK_MONOTONIC, &tmp);
  30     tmp = timedifference(starttime,tmp);
  31     return tmp.tv_sec + (float)tmp.tv_nsec/1000000000;
  32 }
  33
  34 timespec StopWatch::timedifference(timespec start, timespec end)
  35 {
  36     timespec temp;
  37     if ((end.tv_nsec-start.tv_nsec)<0) {
  38         temp.tv_sec = end.tv_sec-start.tv_sec-1;
  39         temp.tv_nsec = 1000000000+end.tv_nsec-start.tv_nsec;
  40     } else {
  41         temp.tv_sec = end.tv_sec-start.tv_sec;
  42         temp.tv_nsec = end.tv_nsec-start.tv_nsec;
  43     }
  44     return temp;
  45 }