nanosleep, usleep, sleep benchmark

gistfile1.c

void nsleep(long us)
{
    struct timespec wait;
    //printf("Will sleep for is %ld\n", diff); //This will take extra ~70 microseconds
    
    wait.tv_sec = us / (1000 * 1000);
    wait.tv_nsec = (us % (1000 * 1000)) * 1000;
    nanosleep(&wait, NULL);
}

main()
{
    struct timeval t1, t2;
    long long t;
	
    long microseconds = 970000;
	
    //nanosleep test
    gettimeofday(&t1, NULL);
    nsleep(microseconds);
    gettimeofday(&t2, NULL);
	
    t = ((t2.tv_sec * 1000000) + t2.tv_usec) - ((t1.tv_sec * 1000000) + t1.tv_usec);
    printf("Call to nsleep(%d) took %lld\n", microseconds, t);

    //usleep test    
    gettimeofday(&t1, NULL);
    usleep(microseconds);
    gettimeofday(&t2, NULL);
	
    t = ((t2.tv_sec * 1000000) + t2.tv_usec) - ((t1.tv_sec * 1000000) + t1.tv_usec);
    printf("Call to usleep(%ld) took %lld\n", microseconds, t);
    
    //sleep test
    gettimeofday(&t1, NULL);
    sleep(1);
    gettimeofday(&t2, NULL);
	
    t = ((t2.tv_sec * 1000000) + t2.tv_usec) - ((t1.tv_sec * 1000000) + t1.tv_usec);
    printf("Call to sleep(1) took %lld\n", t);
}