#define _GNU_SOURCE
#include <time.h>
#include <unistd.h>
#include <sys/syscall.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdlib.h>

void A(){
}

double calculateAverage(double *arr, int len)
{
  double average=0.00;
	//first sum up all entries
	for(int i=0;i<len;i++)
	{
		average+=arr[i];
	}
	return average;
}

 double timespec_to_ms(struct timespec *ts)
 {
 	return ts->tv_sec*1000.0 + ts->tv_nsec/1000000.0;
 }

 int main(int argc, char **argv)
 {
	struct timespec start_time, end_time;

	if(argc <2)
	{
		printf("You entered less than two arguements\n");
		exit(-2);
	}
	if(argv[1] <0)
	{
		printf("you entered a negative argument\n");
		exit(-1);
	}
	//double *TestArray=malloc(sizeof(double)*atoi(argv[1]));
	//double *TestArray2=malloc(sizeof(double)*atoi(argv[1]));
	//double *TestArray3=malloc(sizeof(double)*atoi(argv[1]));
	//double *TestArray4=malloc(sizeof(double)*atoi(argv[1]));


	// Do empty 1
	clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &start_time);
	for(int i=0;i<(atoi(argv[1]));i++)
	{

	 /* begin timing */
		/*for(int i=0;i<1000000;i++)
		{
			//getpid();
			syscall(SYS_getpid);
		}*/
		/*int errorCount=0;
		for(int i=0;i<1000;i++)
		{
			int pid = fork();
		 	if (pid == 0) {
		 	return 0;
			}
		 	if (pid < 0) {
		 		printf("ERROR: Fork failed.\n");
		 	errorCount++;
		 	}
		 	wait(0);

		}*/
		A();

	 /* end timing */

	 //TestArray[i]=(timespec_to_ms(&end_time)-timespec_to_ms(&start_time));
	}
	 clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &end_time);
 printf("%f ms\n", timespec_to_ms(&end_time)
- timespec_to_ms(&start_time));

 }