/*
 * use 'gcc -O3 -DGETPID getid.c -o testgetpid' to make getpid system call
 * use 'gcc -O3 getid.c -o testmyid' to call the getid() routine
 *
 * use 'time testgetpid' to get the total time when making 10M getpid calls
 * use 'time testmyid' to get the total time when calling 10M getid routines
 */ 

#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>

int myid = 1001;

int getid()
{
  return myid;
}

int a[1000];  
main()
{
  int i, j;
  for (i=0; i<100000000; i++) {
#ifndef GETPID
    a[i%1000] = getid();
#else
    a[i%1000] = getpid();
#endif
  }
  printf("a[999] = %d\n", a[999]);
}