// userProg.c++
#include <iostream>
using namespace std; 
#include "myHeap.h"
#include <cstdlib>
#include <sys/ipc.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/shm.h>
#include <sys/wait.h>



myHeap_t **memoryP;

typedef struct node{
        int data;
        struct node *next;
} node_t;


void printFreeList(myHeap_t *);

int main(){
    int shmID, n, pid, status;
    struct shmid_ds buff;
    node_t **lP;
 
    shmID = shmget(IPC_PRIVATE, SIZE+sizeof(node_t *), IPC_CREAT | 0777); 
    lP = (node_t **)shmat(shmID, 0, 0777);
    memoryP = (myHeap **)(lP+1);
    initMyHeap();
   
    cout << "Enter a positive integer: ";
    cin >> n;

    if((pid = fork()) == -1){
      cerr << "fork() fails\n";
      exit(1);
    }
    if(pid == 0){  // child
       node_t *l = NULL, *nP; 

       cout << "Enter " << n << " data\n";
       for(int i=0; i<n; ++i){
          nP = (node_t *)myMalloc(sizeof(node_t)); 
          cin >> nP->data;
          nP->next = l;
          l = nP;
        }
        *lP = l;
    }
    else{   // parent 
         node_t *nP;

         waitpid(pid, &status, 0);

         nP=*lP;
         while(nP) {
              cout << nP->data << " ";
              nP = nP->next;
         }
         cout << endl;
   
//  Testing free ....
//
        cout << "memoryP: " << hex << memoryP << endl;
        initMyHeap();
        printFreeList(*memoryP); 
        void *rp=myMalloc(100); 
        cout << "rp: " << rp << endl;
        printFreeList(*memoryP); 
        myFree(rp);
        printFreeList(*memoryP); 
        rp=myMalloc(150); 
        cout << "rp: " << rp << endl;
        printFreeList(*memoryP); 
        myFree(rp);
        printFreeList(*memoryP); 
        mergeFL();
        printFreeList(*memoryP); 
   

         shmdt(memoryP);
         shmctl(shmID, IPC_RMID, &buff);
    }
    return 0;
}

void printFreeList(myHeap_t *l){
     cout << "Free list: ";
     while(l){
          cout << hex << l << ", ";
          cout << " size: " << l->size << ", ";
          l = l->next;
     }
     cout << endl;
}