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struct timeval start, end;
start.tv_usec = 0;
end.tv_usec = 0;
gettimeofday(&start, NULL);
functionA();
gettimeofday(&end, NULL);
long t = end.tv_usec - start.tv_usec;
printf("Total elapsed time %ld us \n", t);
I am calculating the total elapsed time like this but it sometimes shows a negative value.
What might be cause the problem?
Thanks in advance.
maybe something along the lines of:
long t = (end.tv_sec*1e6 + end.tv_usec) - (start.tv_sec*1e6 + start.tv_usec);