/******************************************************************************
* FILE: hello.c
* DESCRIPTION:
*   A "hello world" Pthreads program.  Demonstrates thread creation and
*   termination.
*
* SOURCE: 
* LAST REVISED: 9/20/98 Blaise Barney
* Modified by Dana Vrajitoru
******************************************************************************/

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>

const int NUM_THREADS = 5;
int shared = 10;
pthread_mutex_t mutex;

void *PrintHello(void *arg)
{
  int threadid = *(int *)arg, id;
  id = pthread_self();
  printf("\n%d: Hello World from %d!\n", threadid, id);
  pthread_exit(NULL);
}

int main()
{
  pthread_t threads[NUM_THREADS];
  int rc, t;
  void *arg;
  for (t=0; t<NUM_THREADS; t++) {
    printf("Creating thread %d\n", t);
    arg = &t;
    rc = pthread_create(&threads[t], NULL, PrintHello, arg);
    if (rc){
      printf("ERROR; return code from pthread_create() is %d\n", rc);
      exit(-1);
    }
  }
  pthread_mutex_lock(&mutex);
  printf("The value of shared in the main is: %d.\n", shared);
  pthread_mutex_unlock(&mutex);
  pthread_exit(NULL);
}