How to get the elapsed time in millisecs

Finding an elapsed time of a function/API/method will help you to understand its performance and the most of our manager/management will hails u if you give them a nice performance graph/chart of an application :)

My Approach:
You can use gettimeofday at the start and end of your method and then the difference the two will give the elapsed time .. You'll get a structure like the one below:

struct timeval {
    time_t      tv_sec;  /* in secs */
    suseconds_t tv_usec; /* in Microseconds */
};

Code snippet:

#include 
#include 
#include 
int main()
{
    struct timeval start, end;
    long mtime, seconds, useconds;    

    // Get the start time
    gettimeofday(&start, NULL);
    
    // Here you go with your method call
    usleep(2000);

    // note the end time
    gettimeofday(&end, NULL);

    seconds  = end.tv_sec  - start.tv_sec;
    useconds = end.tv_usec - start.tv_usec;

    mtime = ((seconds) * 1000 + useconds/1000.0) + 0.5;

    printf("Elapsed time: %ld milliseconds\n", mtime);

    return 0;
}