004.c

/*
..........................................................................................................................................
Name : 004.c
Author : SHRUTI VERMA
Description : Write a program to measure how much time is taken to execute 100 getppid ( )
                system call. Use time stamp counter.
Date : 29 Sep 2025
..........................................................................................................................................
*/

#include<unistd.h>
#include<stdlib.h>
#include<stdint.h>
#include<stdio.h>


static __inline__ uint64_t rdtsc(void) {
    unsigned hi, lo;
    __asm__ __volatile__("rdtsc" : "=a"(lo), "=d"(hi));
    return ((uint64_t)hi << 32) | lo;
}

int main() {
    int start = rdtsc();
    for(int i=0; i<100; i++) getppid();
    int end = rdtsc();

    printf("Timestamp Counter Ticks : %lld\n", (unsigned long long) (end - start));
}

/* ------------------------------OUTPUT----------------------------
Timestamp Counter Ticks : 465045
*/