Thread: execution time in C , Linux

hi

I am interested in calculating execution time of my program, in resolution less than ms. i tried time() function in time.h but it is not working.
is there any function in C, Linux which i can use for this.

Hi..
You can use gettimeofday() function. It is defined in sys/time.h . Just look in man page.

You can use setitimer()/getitimer() calls and write your signal handler to catch SIGALRM. You code mya look like below

Code:

long int usec = 0;
void *sig_handler(int sig)
{
   usec++;
   setitimer(...);
}

int main()
{
   struct itimer ...;
   /* initialize your data structures to rise a signal once in a sec or what ever you want */
   setitimer(...);
   /* do your work here */
   getitimer(...);
   printf(fields in your time structures);
  return 0;
}

Catch the signal with sigaction(), and in your signal handler increment the counter (which keeps the milliseconds or seconds values).