timer_function_without_time.h_v1.c

/*

    timer_function_without_time.h_v1.c      by Dragan Milicev

    Idea is to make timer function without the use of timer.h header file.

    In function
    void my_sleep( int milliseconds )
    I use 3 nested for loops i, j and k,
    to make the required time delay during the run.

    But, required time delay depends on the speed of your machine's processor.

    So I temporarily use header file time.h to set my function to the speed of my processor.
    You do the same.

    Setup:

    Important information for your computer processor is CLOCKS_PER_SEC.
    The program will print to you its value, which you will write
    instead of CLOCKS_PER_SEC in function my_sleep(milliseconds);

    main() is set to have a time delay of 10 seconds.

    Change the #define SETUP_NUMBER 400
    until you get an approximate time of 10,000 milliseconds.

    Write the resulting value of SETUP_NUMBER
    into the function my_sleep(milliseconds);

    After this setup, you will get the my_sleep(milliseconds);
    function which will work accurately enough on your computer
    without heder file time.h .


    You can find all my C programs at Dragan Milicev's pastebin:

    https://pastebin.com/u/dmilicev

    https://www.facebook.com/dmilicev

*/

#include <stdio.h>
#include <time.h>

#define SETUP_NUMBER 400

void my_sleep( int milliseconds )
{
    int i, j, k;

    for(i=0; i<milliseconds; i++)
        for(j=0; j<SETUP_NUMBER; j++)
            for(k=0; k<CLOCKS_PER_SEC; k++);
}

int main () {

    clock_t start_t, end_t, total_t;
    int milliseconds = 10000;   // main() is set to have a time delay of 10 seconds.

    start_t = clock();

    printf("\n Starting of the my_sleep(%d) function, start_t = %ld \n", milliseconds, start_t );

    printf("\n Wait 10 seconds ... \n");

    my_sleep(milliseconds);     // to delay (wait, sleep) 10 seconds

    end_t = clock();

    printf("\n End of the my_sleep(%d) function, end_t = %ld \n", milliseconds, end_t );

    total_t = (double)(end_t - start_t) / CLOCKS_PER_SEC;

    printf("\n Total time taken by CPU: %ld \n", total_t  );

    printf("\n start_t = %ld \t end_t = %ld \t total_t = %ld \n", start_t, end_t, total_t  );

    printf("\n CLOCKS_PER_SEC = %5ld \n", CLOCKS_PER_SEC );

    printf("\n SETUP_NUMBER   = %5d \n", SETUP_NUMBER );


    return(0);
}