/*****************************************************************************
* FILE: hello_arg3.c
* DESCRIPTION:
*   This "hello world" Pthreads program demonstrates an unsafe (incorrect) 
*   way to pass thread arguments at thread creation.  In this case, the 
*   argument variable is changed by the main thread as it creates new threads.
* AUTHOR: Blaise Barney
* LAST REVISED: 06/27/07
******************************************************************************/
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#define NUM_THREADS	8

void *PrintHello(void *threadid)
{
   int *id_ptr, taskid;
   sleep(1);
   id_ptr = (int *) threadid;
   taskid = *id_ptr;
   printf("Hello from thread %d\n", taskid);
   pthread_exit(NULL);
}

int main(int argc, char *argv[])
{
pthread_t threads[NUM_THREADS];
int rc, t;

for(t=0;t<NUM_THREADS;t++) {
  printf("Creating thread %d\n", t);
  rc = pthread_create(&threads[t], NULL, PrintHello, (void *) &t);
  if (rc) {
    printf("ERROR; return code from pthread_create() is %d\n", rc);
    exit(-1);
    }
   }

pthread_exit(NULL);
}