/****************************************************************************** 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: 04/05/05******************************************************************************/#include <pthread.h>#include <stdio.h>#include <stdlib.h>#define NUM_THREADS	8char *messages[NUM_THREADS];void *PrintHello(void *threadid){   int *id_ptr, taskid;   sleep(3);   id_ptr = (int *) threadid;   taskid = *id_ptr;   printf("Thread %d: %s \n", taskid, messages[taskid]);   pthread_exit(NULL);}int main(int argc, char *argv[]){   pthread_t threads[NUM_THREADS];   int rc, t;   messages[0] = "English: Hello World!";   messages[1] = "French: Bonjour, le monde!";   messages[2] = "Spanish: Hola al mundo";   messages[3] = "Klingon: Nuq neH!";   messages[4] = "German: Guten Tag, Welt!";    messages[5] = "Russian: Zdravstvytye, mir!";   messages[6] = "Japan: Sekai e konnichiwa!";   messages[7] = "Latin: Orbis, te saluto!";   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);}