// File: TwoThreads.cpp
// Written by Dr. Spiegel
// Last Revision: 11/16/2014
//  Simple example to show thread interaction
//  Each thread's loop iterates argv[1] times

#include <iostream>
#include <pthread.h>
#include <stdio.h>	// for perror
#include <stdlib.h>

using namespace std;

void *task1(void *X);
void *task2(void *X);

int main(int argc, char *argv[])
{
   pthread_t ThreadA,ThreadB;
   int N;

   if(argc != 2){
      cout << "error" << endl;
      exit (1);
   }

   N = atoi(argv[1]);
   int res;
   if ((res=pthread_create(&ThreadA,NULL,task1,&N))<0) {
     perror("pThread creation");
     cerr << "Thread creation returned " << res << endl;
     exit(-1);
   }
   pthread_create(&ThreadB,NULL,task2,&N);
   cout << "waiting for threads to join" << endl;
   pthread_join(ThreadA,NULL);
   pthread_join(ThreadB,NULL);
   return(0);
}

void *task1(void *X)
{  int *Temp;
   Temp = static_cast<int *>(X);
   cout << "task1: Temp is " << *Temp << endl;
   for(int Count = 1;Count < *Temp;Count++){
       cout << "work from thread A: " << Count << " * 2 = "
            << Count * 2 << endl;
   }
   cout << "Thread A complete" << endl;
}

void *task2(void *X)
{  int *Temp;
   Temp = static_cast<int *>(X);
   cout << "task2: Temp is " << *Temp << endl;
   for(int Count = 1;Count < *Temp;Count++){
       cout << "work from thread B: " << Count << " + 2 = "
            << Count + 2 << endl;
   }
   cout << "Thread B complete" << endl;
}