/********************************************************
 * An example source module to accompany...
 *
 * "Using POSIX Threads: Programming with Pthreads"
 *     by Brad nichols, Dick Buttlar, Jackie Farrell
 *     O'Reilly & Associates, Inc.
 *
 ********************************************************
 * simple_threads.c
 *
 * Simple multi-threaded example.
 */

#include <stdio.h> 
#include <pthread.h>
 
void do_one_thing(int *);
void do_another_thing(int *);
void do_wrap_up(int, int);
 
int main() {
  pthread_t thread1, thread2;
  int r1 = 0, r2 = 0;

  pthread_create(&thread1, NULL, (void *) do_one_thing, (void *) &r1);  
  pthread_create(&thread2, NULL, (void *) do_another_thing, (void *) &r2); 
 
  pthread_join(thread1, NULL);
  pthread_join(thread2, NULL);
 
  do_wrap_up(r1, r2);
}
 
void do_one_thing(int *pnum_times)
{
  int i, j, x;
 
  for (i = 0;  i < 4; i++) {
    printf("doing one thing\n"); 
    for (j = 0; j < 10000; j++) x = x + i;
    (*pnum_times)++;
  }
 
}
 
void do_another_thing(int *pnum_times)
{
  int i, j, x;
 
  for (i = 0;  i < 4; i++) {
    printf("doing another \n"); 
    for (j = 0; j < 10000; j++) x = x + i;
    (*pnum_times)++;
  }
 
}
 
void do_wrap_up(int one_times, int another_times)
{
  int total;
 
  total = one_times + another_times;
  printf("All done, one thing %d, another %d for a total of %d\n",
	one_times, another_times, total);
}